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From: Dimitri Podborski <dpodborski@apple.com>
Date: Mon, 15 May 2023 09:56:11 -0700
Subject: [PATCH 01/12] restore bs file for version 1.2.0

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+<pre class='metadata'>
+Title: AV1 Codec ISO Media File Format Binding
+Text Macro: SPECVERSION v1.2.0
+Status: FD
+URL: https://aomediacodec.github.io/av1-isobmff/
+Shortname: av1-isobmff
+Editor: Cyril Concolato, Netflix, cconcolato@netflix.com
+Editor: Tom Finegan, Google, tom.finegan@google.com
+Abstract: This document specifies the storage format for [[!AV1]] bitstreams in [[!ISOBMFF]] tracks as well as in [[!CMAF]] files.
+Date: 2019-12-12
+Repository: AOMediaCodec/av1-isobmff
+Group: AOM
+
+!Previously approved version: <a href="v1.1.0.html">v1.1.0</a>
+</pre>
+
+<pre class="anchors">
+url: https://www.iso.org/standard/68960.html#; spec: ISOBMFF; type: dfn;
+	text: VisualSampleEntry
+
+url: https://www.iso.org/standard/68960.html#; spec: ISOBMFF; type: property;
+	text: bitr
+	text: clap
+	text: clli
+	text: colr
+	text: ctts
+	text: iso6
+	text: mdcv
+	text: nclx
+	text: pasp
+	text: sgpd
+	text: stsd
+
+url: https://www.webmproject.org/vp9/mp4/#; spec: VP9; type: property;
+	text: SmDm
+	text: CoLL
+
+url: https://tools.ietf.org/html/rfc6381#; spec: RFC6381; type: property;
+	text: codecs
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1; spec: AV1; type: dfn;
+	text: AV1 bitstream
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39; spec: AV1; type: dfn;
+	text: OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40; spec: AV1; type: dfn;
+	text: OBU Header
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49; spec: AV1; type: dfn;
+	text: Frame Header OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41; spec: AV1; type: dfn;
+	text: Sequence Header OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46; spec: AV1; type: dfn;
+	text: Temporal Delimiter OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71; spec: AV1; type: dfn;
+	text: Tile Group OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71; spec: AV1; type: dfn;
+	text: Frame OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121; spec: AV1; type: dfn;
+	text: Tile List OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46; spec: AV1; type: dfn;
+	text: Metadata OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121; spec: AV1; type: dfn;
+	text: Redundant Frame Header OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121; spec: AV1; type: dfn;
+	text: Padding OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206; spec: AV1; type: dfn;
+	text: Random Access Point
+	text: Delayed Random Access Point
+	text: Key Frame Dependent Recovery Point
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13; spec: AV1; type: dfn
+	text: Inter Frame
+	text: Intra-only Frame
+	text: Key Frame
+	text: Switch Frame
+	text: Temporal Unit
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39; spec: AV1; type: dfn
+	text: Low Overhead Bitstream Format
+
+url: https://www.iso.org/standard/71975.html#; spec: CMAF; type: dfn;
+	text: CMAF Video Track
+	text: cmfc
+
+url: https://www.iso.org/standard/68042.html#; spec: CENC; type: dfn;
+	text: BytesOfProtectedData
+	text: BytesOfClearData
+	text: cbcs
+	text: cenc
+	text: cbc1
+	text: cens
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45; spec: AV1; type: dfn
+	text: timing_info
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44; spec: AV1; type: dfn
+	text: color_config
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2; spec: AV1; type: dfn;
+	text: buffer_removal_time
+	text: byte_alignment
+	text: frame_presentation_time
+	text: high_bitdepth
+	text: initial_display_delay_minus_1
+	text: max_frame_height_minus_1
+	text: max_frame_width_minus_1
+	text: mono_chrome
+	text: obu_has_size_field
+	text: obu_size
+	text: open_bitstream_unit
+	text: seq_level_idx
+	text: seq_profile
+	text: seq_tier
+	text: show_existing_frame
+	text: show_frame
+	text: still_picture
+	text: subsampling_x
+	text: subsampling_y
+	text: timing_info_present_flag
+	text: twelve_bit
+</pre>
+
+<pre class='biblio'>
+{
+	"AV1": {
+		"href": "https://aomediacodec.github.io/av1-spec/av1-spec.pdf",
+		"title": "AV1 Bitstream & Decoding Process Specification",
+		"status": "Standard",
+		"publisher": "AOM"
+	},
+	"CMAF": {
+		"title": "Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media",
+		"status": "Standard",
+		"publisher": "ISO",
+		"href": "https://www.iso.org/standard/71975.html"
+	},
+	"CENC": {
+		"title": "Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files",
+		"status": "Standard",
+		"publisher": "ISO",
+		"href": "https://www.iso.org/standard/68042.html"
+	}
+}
+</pre>
+
+Bitstream features overview {#bitstream-overview}
+=================================================
+An [=AV1 bitstream=] is composed of a sequence of [=OBUs=], grouped into [=Temporal Units=].
+
+OBUs are made of a 1 or 2 bytes header, identifying in particular the type of OBU, followed by an optional length field and by an optional payload, whose presence and content depend on the OBU type. Depending on its type, an OBU can carry configuration information, metadata, or coded video data.
+
+NOTE: [=Tile List OBUs=] defined in the [[!AV1]] specification are not supported in the current version of this specification. A future version of the specification may do so.
+
+Temporal Units are processed by a decoder in the order given by the bitstream. Each Temporal Unit is associated with a presentation time. Some Temporal Units may contain multiple frames to be decoded but only one is presented.
+
+NOTE: The AV1 specification defines scalability features, allowing frames from multiple layers or operating points to be present in a single temporal unit. This version of storage in ISOBMFF supports the simple storage of scalable streams in a single track, but does not specify advanced tools for handling multi-track support, layer extraction, or other scalability related use cases. A future version of the specification may do so.
+
+Frames carried in Temporal Units may have coding dependencies on frames carried previously in the same Temporal Unit or in previous Temporal Units. Frames that can be decoded without dependencies to previous frames are of two categories: [=Key Frames=] and [=Intra-only Frames=]. Frames that cannot be decoded independently are of three categories: [=Inter Frames=], [=Switch Frames=], and frames with a [=show_existing_frame=] flag set to 1.
+
+Key Frames with the [=show_frame=] flag set to 1 have the additional property that after decoding the Key Frame, all frames following the Key Frame in the bitstream can be decoded. They are called [=Random Access Points=] in [[!AV1]].
+
+Key Frames with the [=show_frame=] flag set to 0 are called [=Delayed Random Access Points=]. [=Delayed Random Access Points=] have the additional property that if a future [=Key Frame Dependent Recovery Point=] exists, all frames following that [=Key Frame Dependent Recovery Point=] can be decoded. A [=Key Frame Dependent Recovery Point=] is a frame with [=show_existing_frame=] set to 1 that refers to a previous [=Delayed Random Access Points=].
+
+Basic Encapsulation Scheme {#basic-encapsulation}
+=================================================
+
+This section describes the basic data structures used to signal encapsulation of [=AV1 bitstreams=] in [[!ISOBMFF]] containers.
+
+General Requirements & Brands {#brands}
+-----------------------------
+
+A file conformant to this specification satisfies the following:
+- It SHALL conform to the normative requirements of [[!ISOBMFF]]
+- It SHALL have the <dfn value export for="ISOBMFF Brand">av01</dfn> brand among the compatible brands array of the FileTypeBox
+- It SHALL contain at least one track using an [=AV1SampleEntry=]
+- It SHOULD indicate a structural ISOBMFF brand among the compatible brands array of the FileTypeBox, such as 'iso6'
+- It MAY indicate CMAF brands as specified in [[#cmaf]]
+- It MAY indicate other brands not specified in this document provided that the associated requirements do not conflict with those given in this specification
+
+Parsers SHALL support the structures required by the <code>'iso6'</code> brand and MAY support structures required by further ISOBMFF structural brands.
+
+AV1 Sample Entry {#av1sampleentry-section}
+----------------------------------
+
+### Definition ### {#av1sampleentry-definition}
+
+<pre class="def">
+	Sample Entry Type: <dfn value export for="AV1SampleEntry">av01</dfn>
+	Container:         Sample Description Box ('stsd')
+	Mandatory:         Yes
+	Quantity:          One or more.
+</pre>
+
+### Description ### {#av1sampleentry-description}
+
+The <dfn>AV1SampleEntry</dfn> sample entry identifies that the track contains [=AV1 Samples=], and uses an [=AV1CodecConfigurationBox=].
+
+### Syntax ### {#av1sampleentry-syntax}
+
+```
+class AV1SampleEntry extends VisualSampleEntry('av01') {
+  AV1CodecConfigurationBox config;
+}
+```
+
+### Semantics ### {#av1sampleentry-semantics}
+
+The <dfn noexport>width</dfn> and <dfn noexport>height</dfn> fields of the [=VisualSampleEntry=] SHALL equal the values of [=max_frame_width_minus_1=] + 1 and [=max_frame_height_minus_1=] + 1 of the [=Sequence Header OBU=] applying to the samples associated with this sample entry.
+
+The width and height in the TrackHeaderBox SHOULD equal, respectively, the maximum RenderWidth, called MaxRenderWidth, and the maximum RenderHeight, called MaxRenderHeight, of all the frames associated with this sample entry. Additionally, if MaxRenderWidth and MaxRenderHeight values do not equal respectively the [=max_frame_width_minus_1=] + 1 and [=max_frame_height_minus_1=] + 1 values of the [=Sequence Header OBU=], a PixelAspectRatioBox box SHALL be present in the sample entry and set such that
+```
+hSpacing / vSpacing = MaxRenderWidth * (max_frame_height_minus_1 + 1) /
+                              ((max_frame_width_minus_1 + 1) * MaxRenderHeight)
+```
+
+The <dfn noexport>compressorname</dfn> field of the [=VisualSampleEntry=] is an informative name. It is formatted in a fixed 32-byte field, with the first byte set to the number of bytes to be displayed, followed by that number of bytes of displayable data, followed by padding to complete 32 bytes total (including the size byte). The value "\012AOM Coding" is RECOMMENDED; the first byte is a count of the remaining bytes, here represented by \012, which (being octal 12) is decimal 10, the number of bytes in the rest of the string.
+
+NOTE: Parsers may ignore the value of the compressorname field. It is specified in this document simply for legacy and backwards compatibility reasons.
+
+The <dfn noexport>config</dfn> field SHALL contain an [=AV1CodecConfigurationBox=] that applies to the samples associated with this sample entry.
+
+NOTE: Multiple instances of [=AV1SampleEntry=] may be required when the track contains samples requiring a [=AV1CodecConfigurationBox=] with different characteristics.
+
+Optional boxes not specifically mentioned here can be present, in particular those indicated in the definition of the [=VisualSampleEntry=] in [[ISOBMFF]].
+
+AV1 Codec Configuration Box {#av1codecconfigurationbox-section}
+--------------------------------------------------------
+
+### Definition ### {#av1codecconfigurationbox-definition}
+
+<pre class="def">
+	Box Type:  <dfn export>av1C</dfn>
+	Container: AV1 Sample Entry ('av01')
+	Mandatory: Yes
+	Quantity:  Exactly One
+</pre>
+
+
+### Description ### {#av1codecconfigurationbox-description}
+
+The <dfn>AV1CodecConfigurationBox</dfn> contains decoder configuration information that SHALL be valid for every sample that references the sample entry.
+
+
+### Syntax ### {#av1codecconfigurationbox-syntax}
+
+```
+class AV1CodecConfigurationBox extends Box('av1C'){
+  AV1CodecConfigurationRecord av1Config;
+}
+
+aligned (8) class AV1CodecConfigurationRecord {
+  unsigned int (1) marker = 1;
+  unsigned int (7) version = 1;
+  unsigned int (3) seq_profile;
+  unsigned int (5) seq_level_idx_0;
+  unsigned int (1) seq_tier_0;
+  unsigned int (1) high_bitdepth;
+  unsigned int (1) twelve_bit;
+  unsigned int (1) monochrome;
+  unsigned int (1) chroma_subsampling_x;
+  unsigned int (1) chroma_subsampling_y;
+  unsigned int (2) chroma_sample_position;
+  unsigned int (3) reserved = 0;
+
+  unsigned int (1) initial_presentation_delay_present;
+  if (initial_presentation_delay_present) {
+    unsigned int (4) initial_presentation_delay_minus_one;
+  } else {
+    unsigned int (4) reserved = 0;
+  }
+
+  unsigned int (8)[] configOBUs;
+}
+```
+
+### Semantics ### {#av1codecconfigurationbox-semantics}
+
+The <dfn export>marker</dfn> field SHALL be set to 1.
+
+NOTE: The marker bit ensures that the bit pattern of the first byte of the AV1CodecConfigurationRecord cannot be mistaken for an [=OBU Header=] byte.
+
+The <dfn noexport>version</dfn> field indicates the version of the AV1CodecConfigurationRecord. The value SHALL be set to 1 for AV1CodecConfigurationRecord.
+
+The <dfn export>seq_profile</dfn> field indicates the AV1 profile and SHALL be equal to the seq_profile value from the [=Sequence Header OBU=].
+
+The <dfn export>seq_level_idx_0</dfn> field indicates the value of seq_level_idx[0] found in the [=Sequence Header OBU=] and SHALL be equal to the value of seq_level_idx[0] in the [=Sequence Header OBU=].
+
+The <dfn export>seq_tier_0</dfn> field indicates the value of seq_tier[0] found in the [=Sequence Header OBU=] and SHALL be equal to the value of seq_tier[0] in the [=Sequence Header OBU=].
+
+The <dfn export>high_bitdepth</dfn> field indicates the value of the [=high_bitdepth=] flag from the [=Sequence Header OBU=].
+
+The <dfn export>twelve_bit</dfn> field indicates the value of the [=twelve_bit=] flag from the [=Sequence Header OBU=]. When twelve_bit is not present in the [=Sequence Header OBU=] the AV1CodecConfigurationRecord twelve_bit value SHALL be 0.
+
+The <dfn export>monochrome</dfn> field indicates the value of the [=mono_chrome=] flag from the [=Sequence Header OBU=].
+
+The <dfn export>chroma_subsampling_x</dfn> field indicates the [=subsampling_x=] value from the [=Sequence Header OBU=].
+
+The <dfn export>chroma_subsampling_y</dfn> field indicates the [=subsampling_y=] value from the [=Sequence Header OBU=].
+
+The <dfn export>chroma_sample_position</dfn> field indicates the [=chroma_sample_position=] value from the [=Sequence Header OBU=].
+
+When not specified in the [=Sequence Header OBU=], and not defined by the conditions specified in the [[!AV1]] [=color_config=], the values of [=chroma_subsampling_x=], [=chroma_subsampling_y=], and [=chroma_sample_position=] SHALL be 0.
+
+The <dfn export>initial_presentation_delay_present</dfn> field indicates the presence of the initial_presentation_delay_minus_one field.
+
+The <dfn>initial_presentation_delay_minus_one</dfn> field indicates the number of samples (minus one) that need to be decoded prior to starting the presentation of the first sample associated with this sample entry in order to guarantee that each sample will be decoded prior to its presentation time under the constraints of the first level value indicated by [=seq_level_idx=] in the [=Sequence Header OBU=] (in the configOBUs field or in the associated samples). More precisely, the following procedure SHALL not return any error:
+- construct a hypothetical bitstream consisting of the OBUs carried in the sample entry followed by the OBUs carried in all the samples referring to that sample entry,
+- set the first [=initial_display_delay_minus_1=] field of each [=Sequence Header OBU=] to the number of frames minus one contained in the first [=initial_presentation_delay_minus_one=] + 1 samples,
+- set the [=frame_presentation_time=] field of the frame header of each presentable frame such that it matches the presentation time difference between the sample carrying this frame and the previous sample (if it exists, 0 otherwise),
+- apply the decoder model specified in [[!AV1]] to this hypothetical bitstream using the first operating point. If <code>buffer_removal_time</code> information is present in bitstream for this operating point, the decoding schedule mode SHALL be applied, otherwise the resource availability mode SHALL be applied.
+
+NOTE: With the above procedure, when smooth presentation can be guaranteed after decoding the first sample, initial_presentation_delay_minus_one is 0.
+
+NOTE: Because the above procedure considers all OBUs in all samples associated with a sample entry, if these OBUS form multiple coded video sequences which would have different values of <code>initial_presentation_delay_minus_one</code> if considered separately, the sample entry would signal the larger value.
+
+<div class=example>
+The difference between [=initial_presentation_delay_minus_one=] and [=initial_display_delay_minus_1=] can be illustrated by considering the following example:
+```
+a b c d e f g h
+```
+where letters correspond to frames. Assume that <code>[=initial_display_delay_minus_1=]</code> is 2, i.e. that once frame <code>c</code> has been decoded, all other frames in the bitstream can be presented on time. If those frames were grouped into temporal units and samples as follows:
+```
+[a] [b c d] [e] [f] [g] [h]
+```
+<code>[=initial_presentation_delay_minus_one=]</code> would be 1 because it takes presentation of 2 samples to ensure that <code>c</code> is decoded.
+But if the frames were grouped as follows:
+```
+[a] [b] [c] [d e f] [g] [h]
+```
+<code>[=initial_presentation_delay_minus_one=]</code> would be 2 because it takes presentation of 3 samples to ensure that <code>c</code> is decoded.
+</div>
+
+The <dfn export>configOBUs</dfn> field contains zero or more OBUs. Any OBU may be present provided that the following procedures produce compliant AV1 bitstreams:
+- From any sync sample, an AV1 bitstream is formed by first outputting the OBUs contained in the [=AV1CodecConfigurationBox=] and then by outputing all OBUs in the samples themselves, in order, starting from the sync sample.
+- From any sample marked with the [=AV1ForwardKeyFrameSampleGroupEntry=], an AV1 bitstream is formed by first outputting the OBUs contained in the [=AV1CodecConfigurationBox=] and then by outputing all OBUs in the sample itself, then by outputting all OBUs in the samples, in order, starting from the sample at the distance indicated by the sample group.
+
+Additionally, the configOBUs field SHALL contain at most one [=Sequence Header OBU=] and if present, it SHALL be the first OBU.
+
+NOTE: The configOBUs field is expected to contain only one [=Sequence Header OBU=] and zero or more [=Metadata OBUs=] when applicable to all the associated samples.
+
+OBUs stored in the configOBUs field follow the [=open_bitstream_unit=] [=Low Overhead Bitstream Format=] syntax as specified in [[!AV1]]. The flag [=obu_has_size_field=] SHALL be set to 1, indicating that the size of the OBU payload follows the header, and that it is coded using LEB128.
+
+When a [=Sequence Header OBU=] is contained within the configOBUs of the AV1CodecConfigurationRecord, the values present in the [=Sequence Header OBU=] contained within configOBUs SHALL match the values of the AV1CodecConfigurationRecord.
+
+The presentation times of AV1 samples are given by the ISOBMFF structures. The [=timing_info_present_flag=] in the [=Sequence Header OBU=] (in the configOBUs field or in the associated samples) SHOULD be set to 0. If set to 1, the [=timing_info=] structure of the [=Sequence Header OBU=], the [=frame_presentation_time=] and [=buffer_removal_time=] fields of the [=Frame Header OBUs=], if present, SHALL be ignored for the purpose of timed processing of the ISOBMFF file.
+
+The sample entry SHOULD contain a 'colr' box with a colour_type set to 'nclx'. If present, the values of colour_primaries, transfer_characteristics, and matrix_coefficients SHALL match the values given in the [=Sequence Header OBU=] (in the configOBUs field or in the associated samples) if the color_description_present_flag is set to 1. Similarly, the full_range_flag in the 'colr' box shall match the color_range flag in the [=Sequence Header OBU=]. When configOBUs does not contain a [=Sequence Header OBU=], this box with colour_type set to 'nclx' SHALL be present.
+
+The CleanApertureBox 'clap' SHOULD not be present.
+
+For sample entries corresponding to HDR content, the MasteringDisplayColourVolumeBox 'mdcv' and ContentLightLevelBox 'clli' SHOULD be present, and their values SHALL match the values of contained in the [=Metadata OBUs=] of type METADATA_TYPE_HDR_CLL and METADATA_TYPE_HDR_MDCV, if present (in the configOBUs or in the samples).
+
+NOTE: The MasteringDisplayColourVolumeBox 'mdcv' and ContentLightLevelBox 'clli' have identical syntax to the SMPTE2086MasteringDisplayMetadataBox 'SmDm' and ContentLightLevelBox 'CoLL', except that they are of type <code>Box</code> and not <code>FullBox</code>. However, the semantics of the MasteringDisplayColourVolumeBox and SMPTE2086MasteringDisplayMetadataBox have important differences and should not be confused.
+
+Additional boxes may be provided at the end of the [=VisualSampleEntry=] as permitted by ISOBMFF, that may represent redundant or similar information to the one provided in some OBUs contained in the [=AV1CodecConfigurationBox=]. If the box definition does not indicate that its information overrides the OBU information, in case of conflict, the OBU information should be considered authoritative.
+
+AV1 Sample Format {#sampleformat}
+---------------------------------
+
+For tracks using the [=AV1SampleEntry=], an <dfn>AV1 Sample</dfn> has the following constraints:
+- the sample data SHALL be a sequence of [=OBUs=] forming a [=Temporal Unit=],
+- each OBU SHALL follow the [=open_bitstream_unit=] [=Low Overhead Bitstream Format=] syntax as specified in [[!AV1]]. Each OBU SHALL have the [=obu_has_size_field=] set to 1 except for the last OBU in the sample, for which [=obu_has_size_field=] MAY be set to 0, in which case it is assumed to fill the remainder of the sample,
+
+NOTE: When extracting OBUs from an ISOBMFF file, and depending on the capabilities of the decoder processing these OBUs, ISOBMFF parsers MAY need to either: set the [=obu_has_size_field=] to 1 for some OBUs if not already set, add the size field in this case, and add [=Temporal Delimiter OBU=]; or use the length-delimited bitstream format as defined in Annex B of [=AV1=]. If encryption is used, similar operations MAY have to be done before or after decryption depending on the demuxer/decryptor/decoder architecture.
+
+- OBU trailing bits SHOULD be limited to byte alignment and SHOULD not be used for padding,
+- OBUs of type OBU_TEMPORAL_DELIMITER, OBU_PADDING, or OBU_REDUNDANT_FRAME_HEADER SHOULD NOT be used.
+- OBUs of type OBU_TILE_LIST SHALL NOT be used.
+
+If an AV1 Sample is signaled as a sync sample (in the SyncSampleBox or by setting sample_is_non_sync_sample to 0), it SHALL be a Random Access Point as defined in [[!AV1]], i.e. satisfy the following constraints:
+- Its first frame is a [=Key Frame=] that has [=show_frame=] flag set to 1,
+- It contains a [=Sequence Header OBU=] before the first [=Frame Header OBU=].
+
+NOTE: Within this definition, a sync sample may contain additional frames that are not Key Frames. The fact that none of them is the first frame in the temporal unit ensures that they are decodable.
+
+NOTE: Other types of OBUs such as [=metadata OBUs=] could be present before the [=Sequence Header OBU=].
+
+[=Intra-only frames=] SHOULD be signaled using the sample_depends_on flag set to 2.
+
+[=Delayed Random Access Points=] SHOULD be signaled using sample groups and the [=AV1ForwardKeyFrameSampleGroupEntry=].
+
+[=Switch Frames=] SHOULD be signaled using sample groups and the [=AV1SwitchFrameSampleGroupEntry=].
+
+Additionally, if a file contains multiple tracks that are alternative representations of the same content, in particular using [=Switch Frames=], those tracks SHOULD be marked as belonging to the same alternate group and should use a track selection box with an appropriate attribute (e.g. 'bitr').
+
+In tracks using the [=AV1SampleEntry=], the 'ctts' box and composition offsets in movie fragments SHALL NOT be used. Similarly, the is_leading flag, if used, SHALL be set to 0 or 2.
+
+When a temporal unit contains more than one frame, the sample corresponding to that temporal unit MAY be marked using the [=AV1MultiFrameSampleGroupEntry=].
+
+[=Metadata OBUs=] may be carried in sample data. In this case, the [=AV1MetadataSampleGroupEntry=] SHOULD be used. If the [=metadata OBUs=] are static for the entire set of samples associated with a given sample description entry, they SHOULD also be in the OBU array in the sample description entry.
+
+Unless explicitely stated, the grouping_type_parameter is not defined for the SampleToGroupBox with grouping types defined in this specification.
+
+AV1 Forward Key Frame sample group entry {#forwardkeyframesamplegroupentry}
+----------------------------------------------------------------
+
+### Definition ### {#forwardkeyframesamplegroupentry-definition}
+
+<pre class="def">
+	Group Type: <dfn export>av1f</dfn>
+	Container:  Sample Group Description Box ('sgpd')
+	Mandatory:  No
+	Quantity:   Zero or more.
+</pre>
+
+### Description ### {#forwardkeyframesamplegroupentry-description}
+
+The <dfn>AV1ForwardKeyFrameSampleGroupEntry</dfn> documents samples that contain a [=Delayed Random Access Point=] that are followed at a given distance in the bitstream by a [=Key Frame Dependent Recovery Point=].
+
+
+### Syntax ### {#forwardkeyframesamplegroupentry-syntax}
+
+```
+class AV1ForwardKeyFrameSampleGroupEntry extends VisualSampleGroupEntry('av1f') {
+  unsigned int(8) fwd_distance;
+}
+```
+
+### Semantics ### {#forwardkeyframesamplegroupentry-semantics}
+
+The <dfn export>fwd_distance</dfn> field indicates the number of samples between this sample and the next sample containing the associated [=Key Frame Dependent Recovery Point=]. 0 means the next sample.
+
+AV1 Multi-Frame sample group entry {#multiframesamplegroupentry}
+----------------------------------------------------------------
+
+### Definition ### {#multiframesamplegroupentry-definition}
+
+<pre class="def">
+	Group Type: <dfn value export for="AV1MultiFrameSampleGroupEntry">av1m</dfn>
+	Container:  Sample Group Description Box ('sgpd')
+	Mandatory:  No
+	Quantity:   Zero or more.
+</pre>
+
+
+### Description ### {#multiframesamplegroupentry-description}
+
+The <dfn>AV1MultiFrameSampleGroupEntry</dfn> documents samples that contain multiple frames.
+
+
+### Syntax ### {#multiframesamplegroupentry-syntax}
+
+```
+class AV1MultiFrameSampleGroupEntry extends VisualSampleGroupEntry('av1m') {
+}
+```
+
+AV1 Switch Frame sample group entry {#switchframesamplegroupentry}
+-------------------------------------------------------
+
+### Definition ### {#switchframesamplegroupentry-definition}
+
+<pre class="def">
+	Group Type: <dfn export>av1s</dfn>
+	Container:  Sample Group Description Box ('sgpd')
+	Mandatory:  No
+	Quantity:   Zero or more.
+</pre>
+
+
+### Description ### {#switchframesamplegroupentry-description}
+
+The <dfn>AV1SwitchFrameSampleGroupEntry</dfn> documents samples that start with a [=Switch Frame=].
+
+### Syntax ### {#switchframesamplegroupentry-syntax}
+
+```
+class AV1SwitchFrameSampleGroupEntry extends VisualSampleGroupEntry('av1s') {
+}
+```
+
+AV1 Metadata sample group entry {#metadatasamplegroupentry}
+-----------------------------------------------------------
+
+### Definition ### {#metadatasamplegroupentry-definition}
+
+<pre class="def">
+	Group Type: <dfn value noexport for="AV1MetadataSampleGroupEntry">av1M</dfn>
+	Container:  Sample Group Description Box ('sgpd')
+	Mandatory:  No
+	Quantity:   Zero or more.
+</pre>
+
+
+### Description ### {#metadatasamplegroupentry-description}
+
+The <dfn>AV1MetadataSampleGroupEntry</dfn> documents samples that contain [=metadata OBUs=]. The <code>grouping_type_parameter</code> can be used to identify samples containing [=metadata OBUs=] of a given type. If no <code>grouping_type_parameter</code> is provided, the sample group entry identifies samples containing [=metadata OBUs=] for which the <code>metadata_type</code> is unknown.
+
+### Syntax ### {#metadatasamplegroupentry-syntax}
+
+```
+class AV1MetadataSampleGroupEntry extends VisualSampleGroupEntry('av1M') {
+}
+```
+
+For this sample group entry, the <code>grouping_type_parameter</code> syntax is as follows:
+
+```
+{
+   unsigned int (8) metadata_type;
+   unsigned int (24) metadata_specific_parameters;
+}
+```
+
+### Semantics ### {#metadatasamplegroupentry-semantics}
+
+<dfn export>metadata_type</dfn> is a 8-bit field whose value is the value of the metadata_type field defined in [[!AV1]], when it is equal or lower than 255. metadata_type values above 255 are not supported by this sample group.
+
+<dfn export>metadata_specific_parameters</dfn> provides an additional part of the <code>grouping_type_parameter</code>, which MAY be used to distinguish different sample groups having the same <code>metadata_type</code> but different sub-parameters. In this version of the specification, <code>metadata_specific_parameters</code> is only defined when <code>metadata_type</code> is set to <code>METADATA_TYPE_ITUT_T35</code> in which case its value SHALL be set to the first 24 bits of the <code>metadata_itut_t35</code> structure. For other types of metadata, its value SHOULD be set to 0. In all cases, when the <code>grouping_type_parameter</code> is used, readers processing sample groups SHALL use the entire value of <code>grouping_type_parameter</code>.
+
+CMAF AV1 track format {#cmaf}
+=====================================================
+
+[[CMAF]] defines structural constraints on ISOBMFF files additional to [[ISOBMFF]] for the purpose of, for example, adaptive streaming or for protected files. Conformance to these structural constraints is signaled by the presence of the brand <code>[=cmfc=]</code> in the <code>FileTypeBox</code>.
+
+If a [=CMAF Video Track=] uses the brand <code>av01</code>, it is called a <dfn>CMAF AV1 Track</dfn> and the following constraints, defining the CMAF Media Profile for AV1, apply:
+- it SHALL use an [=AV1SampleEntry=]
+- it MAY use multiple sample entries, and in that case the following values SHALL not change in the track:
+    - <code>seq_profile</code>
+    - <code>still_picture</code>
+    - the first value of <code>seq_level_idx</code>
+    - the first value of <code>seq_tier</code>
+    - <code>color_config</code>
+    - <code>initial_presentation_delay_minus_one</code>
+
+When protected, [=CMAF AV1 Tracks=] SHALL use the signaling defined in [[!CMAF]], which in turn relies on [[!CENC]], with the provisions specified in [[#CommonEncryption]].
+
+Common Encryption {#CommonEncryption}
+=========================
+
+[=CMAF AV1 Tracks=] and non-segmented AV1 files MAY be protected. If protected, they SHALL conform to [[!CENC]]. Files SHOULD be protected using the <code>[=cbcs=]</code> protection scheme and MAY be protected using the <code>[=cenc=]</code> protection scheme.
+
+When the protected scheme <code>[=cenc=]</code> is used, samples SHALL be protected using subsample encryption and SHALL NOT use pattern encryption.
+
+When the protected scheme <code>[=cbcs=]</code> is used, samples SHALL be protected using subsample encryption and SHALL use pattern encryption. [[!CENC]] recommends that the Block Pattern length be 10, i.e. <code>crypt_byte_block + skip_byte_block = 10</code>, where a Block is of size 16-bytes. In this specification, the combination of <code>crypt_byte_block</code> and <code>skip_byte_block</code> SHALL be one of the following, with the first one being recommended:
+- <code>crypt_byte_block = 1</code> and <code>skip_byte_block = 9</code>,
+- <code>crypt_byte_block = 5</code> and <code>skip_byte_block = 5</code>,
+- <code>crypt_byte_block = 10</code> and <code>skip_byte_block = 0</code>.
+
+
+General Subsample Encryption constraints {#subsample-encryption}
+--------------------------------------
+
+Within protected samples, the following constraints apply:
+- Protected samples SHALL be exactly spanned by one or more contiguous subsamples.
+	- An OBU MAY be spanned by one or more subsamples, especially when it has multiple ranges of protected data. However, as recommended in [[!CENC]], writers SHOULD reduce the number of subsamples as possible. This can be achieved by using a subsample that spans multiple consecutive unprotected OBUs as well as the first unprotected and protected parts of the following protected OBU, if such protected OBU exists.
+	- A large unprotected OBU whose data size is larger than the maximum size of a single [=BytesOfClearData=] field MAY be spanned by multiple subsamples with zero size [=BytesOfProtectedData=].
+
+- All [=OBU Headers=] and associated [=obu_size=] fields SHALL be unprotected.
+- [=Temporal Delimiter OBUs=], [=Sequence Header OBUs=], and [=Frame Header OBUs=] (including within a [=Frame OBU=]), [=Redundant Frame Header OBUs=] and [=Padding OBUs=] SHALL be unprotected.
+- [=Metadata OBUs=] MAY be protected.
+- [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be protected. Within [=Tile Group OBUs=] or [=Frame OBUs=], the following applies:
+	- for the protected scheme <code>[=cbcs=]</code>:
+		- [=BytesOfProtectedData=] SHALL start on the first byte and end on the last byte of the <code>decode_tile</code> structure (including any trailing bits).
+
+	    NOTE: As a result of the above, [=BytesOfProtectedData=] is not necessarily a multiple of 16 bytes and partial blocks are included in the [=BytesOfProtectedData=] range, but per [[!CENC]] the data is not be encrypted.
+
+	    - A subsample SHALL be created for each tile, even if its size is less than 16 bytes.
+		- All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected.
+
+	- for the protected scheme <code>[=cenc=]</code>:
+	    - [=BytesOfProtectedData=] SHALL be a multiple of 16 bytes.
+	    - [=BytesOfProtectedData=] SHALL end on the last byte of the <code>decode_tile</code> structure (including any trailing bits).
+	    - [=BytesOfProtectedData=] SHALL span all complete 16-byte blocks of the <code>decode_tile</code> structure (including any trailing bits).
+
+	    NOTE: As a result of the above, partial blocks are not used and it is possible that [=BytesOfProtectedData=] does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.
+	    - A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes. If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the [=BytesOfClearData=] field of a surrounding subsample, if any.
+		- All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected.
+
+Subsample Encryption Illustration {#subsample-encryption-illustration}
+------------------
+Figure #1 illustrates Subsample based encryption of AV1.
+
+<figure>
+<img alt="Subsample-based AV1 encryption" src="images/subsample_encryption.svg">
+<figcaption>Subsample-based AV1 encryption.</figcaption>
+</figure>
+
+Codecs Parameter String {#codecsparam}
+======================================
+
+DASH and other applications require defined values for the 'Codecs' parameter specified in [[!RFC6381]] for ISO Media tracks. The codecs parameter string for the AOM AV1 codec is as follows:
+```
+<sample entry 4CC>.<profile>.<level><tier>.<bitDepth>.<monochrome>.<chromaSubsampling>.
+<colorPrimaries>.<transferCharacteristics>.<matrixCoefficients>.<videoFullRangeFlag>
+```
+
+All fields following the sample entry 4CC are expressed as double digit decimals, unless indicated otherwise. Leading or trailing zeros cannot be omitted.
+
+The profile parameter value, represented by a single digit decimal, SHALL equal the value of seq_profile in the [=Sequence Header OBU=].
+
+The level parameter value SHALL equal the first level value indicated by [=seq_level_idx=] in the [=Sequence Header OBU=].
+
+The tier parameter value SHALL be equal to <code>M</code> when the first [=seq_tier=] value in the [=Sequence Header OBU=] is equal to 0, and <code>H</code> when it is equal to 1.
+
+The bitDepth parameter value SHALL equal the value of BitDepth variable as defined in [[AV1]] derived from the [=Sequence Header OBU=].
+
+The monochrome parameter value, represented by a single digit decimal, SHALL equal the value of mono_chrome in the [=Sequence Header OBU=].
+
+The chromaSubsampling parameter value, represented by a three-digit decimal, SHALL have its first digit equal to subsampling_x and its second digit equal to subsampling_y. If both subsampling_x and subsampling_y are set to 1, then the third digit SHALL be equal to chroma_sample_position, otherwise it SHALL be set to 0.
+
+The colorPrimaries, transferCharacteristics, matrixCoefficients, and videoFullRangeFlag parameter values SHALL equal the value of matching fields in the [=Sequence Header OBU=], if color_description_present_flag is set to 1, otherwise they SHOULD not be set, defaulting to the values below. The videoFullRangeFlag is represented by a single digit.
+
+For example, codecs="av01.0.04M.10.0.112.09.16.09.0" represents AV1 Main Profile, level 3.0, Main tier, 10-bit content, non-monochrome, with 4:2:0 chroma subsampling co-located with (0, 0) luma sample, ITU-R BT.2100 color primaries, ITU-R BT.2100 PQ transfer characteristics, ITU-R BT.2100 YCbCr color matrix, and studio swing representation.
+
+The parameters sample entry 4CC, profile, level, tier, and bitDepth are all mandatory fields. If any of these fields are empty, or not within their allowed range, the processing device SHOULD treat it as an error.
+
+All the other fields (including their leading '.') are optional, mutually inclusive (all or none) fields. If not specified then the values listed in the table below are assumed.
+
+<table class="def">
+<tr>
+<td>mono_chrome</td><td>0</td>
+</tr>
+<tr>
+<td>chromaSubsampling</td><td>110 (4:2:0)</td>
+</tr>
+<tr>
+<td>colorPrimaries</td><td>1 (ITU-R BT.709)</td>
+</tr>
+<tr>
+<td>transferCharacteristics</td><td>1 (ITU-R BT.709)</td>
+</tr>
+<tr>
+<td>matrixCoefficients</td><td>1 (ITU-R BT.709)</td>
+</tr>
+<tr>
+<td>videoFullRangeFlag</td><td>0 (studio swing representation)</td>
+</tr>
+</table>
+
+The string codecs="av01.0.01M.08" in this case would represent AV1 Main Profile, level 2.1, Main tier, 8-bit content with 4:2:0 chroma subsampling, ITU-R BT.709 color primaries, transfer characteristics, matrix coefficients, and studio swing representation.
+
+If any character that is not '.', digits, part of the AV1 4CC, or a tier value is encountered, the string SHALL be interpreted ignoring all the characters starting from that character.
+
+Changes since v1.1.0 release {#changelist}
+==========================================
+- <a href="https://github.com/AOMediaCodec/av1-isobmff/pull/116"> Change tile/subsample alignement for the <code>cbcs</code> protection scheme.</a>
+
+

From 8d63212702520135f8cea50d4040b9f32e4526ea Mon Sep 17 00:00:00 2001
From: Dimitri Podborski <dpodborski@apple.com>
Date: Mon, 15 May 2023 09:57:45 -0700
Subject: [PATCH 02/12] start adding asserts to 1.2.0

---
 index_120.bs | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/index_120.bs b/index_120.bs
index 231dc4f..d3ece61 100644
--- a/index_120.bs
+++ b/index_120.bs
@@ -181,12 +181,12 @@ General Requirements & Brands {#brands}
 -----------------------------
 
 A file conformant to this specification satisfies the following:
-- It SHALL conform to the normative requirements of [[!ISOBMFF]]
-- It SHALL have the <dfn value export for="ISOBMFF Brand">av01</dfn> brand among the compatible brands array of the FileTypeBox
-- It SHALL contain at least one track using an [=AV1SampleEntry=]
-- It SHOULD indicate a structural ISOBMFF brand among the compatible brands array of the FileTypeBox, such as 'iso6'
-- It MAY indicate CMAF brands as specified in [[#cmaf]]
-- It MAY indicate other brands not specified in this document provided that the associated requirements do not conflict with those given in this specification
+- <assert>It SHALL conform to the normative requirements of [[!ISOBMFF]]</assert>
+- <assert>It SHALL have the <dfn value export for="ISOBMFF Brand">av01</dfn> brand among the compatible brands array of the FileTypeBox</assert>
+- <assert>It SHALL contain at least one track using an [=AV1SampleEntry=]</assert>
+- <assert>It SHOULD indicate a structural ISOBMFF brand among the compatible brands array of the FileTypeBox, such as 'iso6'</assert>
+- <assert>It MAY indicate CMAF brands as specified in [[#cmaf]]</assert>
+- <assert>It MAY indicate other brands not specified in this document provided that the associated requirements do not conflict with those given in this specification</assert>
 
 Parsers SHALL support the structures required by the <code>'iso6'</code> brand and MAY support structures required by further ISOBMFF structural brands.
 
@@ -198,8 +198,8 @@ AV1 Sample Entry {#av1sampleentry-section}
 <pre class="def">
 	Sample Entry Type: <dfn value export for="AV1SampleEntry">av01</dfn>
 	Container:         Sample Description Box ('stsd')
-	Mandatory:         Yes
-	Quantity:          One or more.
+	Mandatory:         <assert>Yes</assert>
+	Quantity:          <assert>One or more.</assert>
 </pre>
 
 ### Description ### {#av1sampleentry-description}

From 478571287d843a01f5edd530d1e6cc46d1e5ef0d Mon Sep 17 00:00:00 2001
From: Dimitri Podborski <dpodborski@apple.com>
Date: Wed, 17 May 2023 18:24:37 -0700
Subject: [PATCH 03/12] add missing asserts

---
 index_120.bs | 171 ++++++++++++++++++++++++++-------------------------
 1 file changed, 86 insertions(+), 85 deletions(-)

diff --git a/index_120.bs b/index_120.bs
index d3ece61..a926ccd 100644
--- a/index_120.bs
+++ b/index_120.bs
@@ -216,23 +216,24 @@ class AV1SampleEntry extends VisualSampleEntry('av01') {
 
 ### Semantics ### {#av1sampleentry-semantics}
 
-The <dfn noexport>width</dfn> and <dfn noexport>height</dfn> fields of the [=VisualSampleEntry=] SHALL equal the values of [=max_frame_width_minus_1=] + 1 and [=max_frame_height_minus_1=] + 1 of the [=Sequence Header OBU=] applying to the samples associated with this sample entry.
+<assert>The <dfn noexport>width</dfn> and <dfn noexport>height</dfn> fields of the [=VisualSampleEntry=] SHALL equal the values of [=max_frame_width_minus_1=] + 1 and [=max_frame_height_minus_1=] + 1 of the [=Sequence Header OBU=] applying to the samples associated with this sample entry.</assert>
 
-The width and height in the TrackHeaderBox SHOULD equal, respectively, the maximum RenderWidth, called MaxRenderWidth, and the maximum RenderHeight, called MaxRenderHeight, of all the frames associated with this sample entry. Additionally, if MaxRenderWidth and MaxRenderHeight values do not equal respectively the [=max_frame_width_minus_1=] + 1 and [=max_frame_height_minus_1=] + 1 values of the [=Sequence Header OBU=], a PixelAspectRatioBox box SHALL be present in the sample entry and set such that
+<assert>The width and height in the TrackHeaderBox SHOULD equal, respectively, the maximum RenderWidth, called MaxRenderWidth, and the maximum RenderHeight, called MaxRenderHeight, of all the frames associated with this sample entry.</assert>
+<assert>Additionally, if MaxRenderWidth and MaxRenderHeight values do not equal respectively the [=max_frame_width_minus_1=] + 1 and [=max_frame_height_minus_1=] + 1 values of the [=Sequence Header OBU=], a PixelAspectRatioBox box SHALL be present in the sample entry and set such that</assert>
 ```
 hSpacing / vSpacing = MaxRenderWidth * (max_frame_height_minus_1 + 1) /
                               ((max_frame_width_minus_1 + 1) * MaxRenderHeight)
 ```
 
-The <dfn noexport>compressorname</dfn> field of the [=VisualSampleEntry=] is an informative name. It is formatted in a fixed 32-byte field, with the first byte set to the number of bytes to be displayed, followed by that number of bytes of displayable data, followed by padding to complete 32 bytes total (including the size byte). The value "\012AOM Coding" is RECOMMENDED; the first byte is a count of the remaining bytes, here represented by \012, which (being octal 12) is decimal 10, the number of bytes in the rest of the string.
+The <dfn noexport>compressorname</dfn> field of the [=VisualSampleEntry=] is an informative name. It is formatted in a fixed 32-byte field, with the first byte set to the number of bytes to be displayed, followed by that number of bytes of displayable data, followed by padding to complete 32 bytes total (including the size byte). <assert>The value "\012AOM Coding" is RECOMMENDED</assert>; the first byte is a count of the remaining bytes, here represented by \012, which (being octal 12) is decimal 10, the number of bytes in the rest of the string.
 
 NOTE: Parsers may ignore the value of the compressorname field. It is specified in this document simply for legacy and backwards compatibility reasons.
 
-The <dfn noexport>config</dfn> field SHALL contain an [=AV1CodecConfigurationBox=] that applies to the samples associated with this sample entry.
+<assert>The <dfn noexport>config</dfn> field SHALL contain an [=AV1CodecConfigurationBox=] that applies to the samples associated with this sample entry.</assert>
 
-NOTE: Multiple instances of [=AV1SampleEntry=] may be required when the track contains samples requiring a [=AV1CodecConfigurationBox=] with different characteristics.
+NOTE: <assert>Multiple instances of [=AV1SampleEntry=] may be required when the track contains samples requiring a [=AV1CodecConfigurationBox=] with different characteristics.</assert>
 
-Optional boxes not specifically mentioned here can be present, in particular those indicated in the definition of the [=VisualSampleEntry=] in [[ISOBMFF]].
+<assert>Optional boxes not specifically mentioned here can be present, in particular those indicated in the definition of the [=VisualSampleEntry=] in [[ISOBMFF]].</assert>
 
 AV1 Codec Configuration Box {#av1codecconfigurationbox-section}
 --------------------------------------------------------
@@ -242,14 +243,14 @@ AV1 Codec Configuration Box {#av1codecconfigurationbox-section}
 <pre class="def">
 	Box Type:  <dfn export>av1C</dfn>
 	Container: AV1 Sample Entry ('av01')
-	Mandatory: Yes
-	Quantity:  Exactly One
+	Mandatory: <assert>Yes</assert>
+	Quantity:  <assert>Exactly One</assert>
 </pre>
 
 
 ### Description ### {#av1codecconfigurationbox-description}
 
-The <dfn>AV1CodecConfigurationBox</dfn> contains decoder configuration information that SHALL be valid for every sample that references the sample entry.
+<assert>The <dfn>AV1CodecConfigurationBox</dfn> contains decoder configuration information that SHALL be valid for every sample that references the sample entry.</assert>
 
 
 ### Syntax ### {#av1codecconfigurationbox-syntax}
@@ -286,21 +287,21 @@ aligned (8) class AV1CodecConfigurationRecord {
 
 ### Semantics ### {#av1codecconfigurationbox-semantics}
 
-The <dfn export>marker</dfn> field SHALL be set to 1.
+<assert>The <dfn export>marker</dfn> field SHALL be set to 1.</assert>
 
 NOTE: The marker bit ensures that the bit pattern of the first byte of the AV1CodecConfigurationRecord cannot be mistaken for an [=OBU Header=] byte.
 
-The <dfn noexport>version</dfn> field indicates the version of the AV1CodecConfigurationRecord. The value SHALL be set to 1 for AV1CodecConfigurationRecord.
+The <dfn noexport>version</dfn> field indicates the version of the AV1CodecConfigurationRecord. <assert>The value SHALL be set to 1 for AV1CodecConfigurationRecord</assert>.
 
-The <dfn export>seq_profile</dfn> field indicates the AV1 profile and SHALL be equal to the seq_profile value from the [=Sequence Header OBU=].
+<assert>The <dfn export>seq_profile</dfn> field indicates the AV1 profile and SHALL be equal to the seq_profile value from the [=Sequence Header OBU=].</assert>
 
-The <dfn export>seq_level_idx_0</dfn> field indicates the value of seq_level_idx[0] found in the [=Sequence Header OBU=] and SHALL be equal to the value of seq_level_idx[0] in the [=Sequence Header OBU=].
+<assert>The <dfn export>seq_level_idx_0</dfn> field indicates the value of seq_level_idx[0] found in the [=Sequence Header OBU=] and SHALL be equal to the value of seq_level_idx[0] in the [=Sequence Header OBU=]</assert>.
 
-The <dfn export>seq_tier_0</dfn> field indicates the value of seq_tier[0] found in the [=Sequence Header OBU=] and SHALL be equal to the value of seq_tier[0] in the [=Sequence Header OBU=].
+<assert>The <dfn export>seq_tier_0</dfn> field indicates the value of seq_tier[0] found in the [=Sequence Header OBU=] and SHALL be equal to the value of seq_tier[0] in the [=Sequence Header OBU=]</assert>.
 
 The <dfn export>high_bitdepth</dfn> field indicates the value of the [=high_bitdepth=] flag from the [=Sequence Header OBU=].
 
-The <dfn export>twelve_bit</dfn> field indicates the value of the [=twelve_bit=] flag from the [=Sequence Header OBU=]. When twelve_bit is not present in the [=Sequence Header OBU=] the AV1CodecConfigurationRecord twelve_bit value SHALL be 0.
+The <dfn export>twelve_bit</dfn> field indicates the value of the [=twelve_bit=] flag from the [=Sequence Header OBU=]. <assert>When twelve_bit is not present in the [=Sequence Header OBU=] the AV1CodecConfigurationRecord twelve_bit value SHALL be 0.</assert>
 
 The <dfn export>monochrome</dfn> field indicates the value of the [=mono_chrome=] flag from the [=Sequence Header OBU=].
 
@@ -310,11 +311,11 @@ The <dfn export>chroma_subsampling_y</dfn> field indicates the [=subsampling_y=]
 
 The <dfn export>chroma_sample_position</dfn> field indicates the [=chroma_sample_position=] value from the [=Sequence Header OBU=].
 
-When not specified in the [=Sequence Header OBU=], and not defined by the conditions specified in the [[!AV1]] [=color_config=], the values of [=chroma_subsampling_x=], [=chroma_subsampling_y=], and [=chroma_sample_position=] SHALL be 0.
+<assert>When not specified in the [=Sequence Header OBU=], and not defined by the conditions specified in the [[!AV1]] [=color_config=], the values of [=chroma_subsampling_x=], [=chroma_subsampling_y=], and [=chroma_sample_position=] SHALL be 0.</assert>
 
 The <dfn export>initial_presentation_delay_present</dfn> field indicates the presence of the initial_presentation_delay_minus_one field.
 
-The <dfn>initial_presentation_delay_minus_one</dfn> field indicates the number of samples (minus one) that need to be decoded prior to starting the presentation of the first sample associated with this sample entry in order to guarantee that each sample will be decoded prior to its presentation time under the constraints of the first level value indicated by [=seq_level_idx=] in the [=Sequence Header OBU=] (in the configOBUs field or in the associated samples). More precisely, the following procedure SHALL not return any error:
+The <dfn>initial_presentation_delay_minus_one</dfn> field indicates the number of samples (minus one) that need to be decoded prior to starting the presentation of the first sample associated with this sample entry in order to guarantee that each sample will be decoded prior to its presentation time under the constraints of the first level value indicated by [=seq_level_idx=] in the [=Sequence Header OBU=] (in the configOBUs field or in the associated samples). More precisely, <assert>the following procedure SHALL not return any error</assert>:
 - construct a hypothetical bitstream consisting of the OBUs carried in the sample entry followed by the OBUs carried in all the samples referring to that sample entry,
 - set the first [=initial_display_delay_minus_1=] field of each [=Sequence Header OBU=] to the number of frames minus one contained in the first [=initial_presentation_delay_minus_one=] + 1 samples,
 - set the [=frame_presentation_time=] field of the frame header of each presentable frame such that it matches the presentation time difference between the sample carrying this frame and the previous sample (if it exists, 0 otherwise),
@@ -341,44 +342,44 @@ But if the frames were grouped as follows:
 <code>[=initial_presentation_delay_minus_one=]</code> would be 2 because it takes presentation of 3 samples to ensure that <code>c</code> is decoded.
 </div>
 
-The <dfn export>configOBUs</dfn> field contains zero or more OBUs. Any OBU may be present provided that the following procedures produce compliant AV1 bitstreams:
-- From any sync sample, an AV1 bitstream is formed by first outputting the OBUs contained in the [=AV1CodecConfigurationBox=] and then by outputing all OBUs in the samples themselves, in order, starting from the sync sample.
-- From any sample marked with the [=AV1ForwardKeyFrameSampleGroupEntry=], an AV1 bitstream is formed by first outputting the OBUs contained in the [=AV1CodecConfigurationBox=] and then by outputing all OBUs in the sample itself, then by outputting all OBUs in the samples, in order, starting from the sample at the distance indicated by the sample group.
+<assert>The <dfn export>configOBUs</dfn> field contains zero or more OBUs</assert>. Any OBU may be present provided that the following procedures produce compliant AV1 bitstreams:
+- <assert>From any sync sample, an AV1 bitstream is formed by first outputting the OBUs contained in the [=AV1CodecConfigurationBox=] and then by outputing all OBUs in the samples themselves, in order, starting from the sync sample.</assert>
+- <assert>From any sample marked with the [=AV1ForwardKeyFrameSampleGroupEntry=], an AV1 bitstream is formed by first outputting the OBUs contained in the [=AV1CodecConfigurationBox=] and then by outputing all OBUs in the sample itself, then by outputting all OBUs in the samples, in order, starting from the sample at the distance indicated by the sample group.</assert>
 
-Additionally, the configOBUs field SHALL contain at most one [=Sequence Header OBU=] and if present, it SHALL be the first OBU.
+Additionally, <assert>the configOBUs field SHALL contain at most one [=Sequence Header OBU=]</assert> and if present, <assert>it SHALL be the first OBU</assert>.
 
 NOTE: The configOBUs field is expected to contain only one [=Sequence Header OBU=] and zero or more [=Metadata OBUs=] when applicable to all the associated samples.
 
-OBUs stored in the configOBUs field follow the [=open_bitstream_unit=] [=Low Overhead Bitstream Format=] syntax as specified in [[!AV1]]. The flag [=obu_has_size_field=] SHALL be set to 1, indicating that the size of the OBU payload follows the header, and that it is coded using LEB128.
+OBUs stored in the configOBUs field follow the [=open_bitstream_unit=] [=Low Overhead Bitstream Format=] syntax as specified in [[!AV1]]. <assert>The flag [=obu_has_size_field=] SHALL be set to 1, indicating that the size of the OBU payload follows the header, and that it is coded using LEB128</assert>.
 
-When a [=Sequence Header OBU=] is contained within the configOBUs of the AV1CodecConfigurationRecord, the values present in the [=Sequence Header OBU=] contained within configOBUs SHALL match the values of the AV1CodecConfigurationRecord.
+<assert>When a [=Sequence Header OBU=] is contained within the configOBUs of the AV1CodecConfigurationRecord, the values present in the [=Sequence Header OBU=] contained within configOBUs SHALL match the values of the AV1CodecConfigurationRecord.</assert>
 
-The presentation times of AV1 samples are given by the ISOBMFF structures. The [=timing_info_present_flag=] in the [=Sequence Header OBU=] (in the configOBUs field or in the associated samples) SHOULD be set to 0. If set to 1, the [=timing_info=] structure of the [=Sequence Header OBU=], the [=frame_presentation_time=] and [=buffer_removal_time=] fields of the [=Frame Header OBUs=], if present, SHALL be ignored for the purpose of timed processing of the ISOBMFF file.
+The presentation times of AV1 samples are given by the ISOBMFF structures. <assert>The [=timing_info_present_flag=] in the [=Sequence Header OBU=] (in the configOBUs field or in the associated samples) SHOULD be set to 0</assert>. <assert>If set to 1, the [=timing_info=] structure of the [=Sequence Header OBU=], the [=frame_presentation_time=] and [=buffer_removal_time=] fields of the [=Frame Header OBUs=], if present, SHALL be ignored for the purpose of timed processing of the ISOBMFF file.</assert>
 
-The sample entry SHOULD contain a 'colr' box with a colour_type set to 'nclx'. If present, the values of colour_primaries, transfer_characteristics, and matrix_coefficients SHALL match the values given in the [=Sequence Header OBU=] (in the configOBUs field or in the associated samples) if the color_description_present_flag is set to 1. Similarly, the full_range_flag in the 'colr' box shall match the color_range flag in the [=Sequence Header OBU=]. When configOBUs does not contain a [=Sequence Header OBU=], this box with colour_type set to 'nclx' SHALL be present.
+<assert>The sample entry SHOULD contain a 'colr' box with a colour_type set to 'nclx'</assert>. <assert>If present, the values of colour_primaries, transfer_characteristics, and matrix_coefficients SHALL match the values given in the [=Sequence Header OBU=] (in the configOBUs field or in the associated samples) if the color_description_present_flag is set to 1</assert>. Similarly, <assert>the full_range_flag in the 'colr' box shall match the color_range flag in the [=Sequence Header OBU=]. When configOBUs does not contain a [=Sequence Header OBU=], this box with colour_type set to 'nclx' SHALL be present.</assert>
 
-The CleanApertureBox 'clap' SHOULD not be present.
+<assert>The CleanApertureBox 'clap' SHOULD not be present.</assert>
 
-For sample entries corresponding to HDR content, the MasteringDisplayColourVolumeBox 'mdcv' and ContentLightLevelBox 'clli' SHOULD be present, and their values SHALL match the values of contained in the [=Metadata OBUs=] of type METADATA_TYPE_HDR_CLL and METADATA_TYPE_HDR_MDCV, if present (in the configOBUs or in the samples).
+For sample entries corresponding to HDR content, <assert>the MasteringDisplayColourVolumeBox 'mdcv' and ContentLightLevelBox 'clli' SHOULD be present</assert>, and <assert>their values SHALL match the values of contained in the [=Metadata OBUs=] of type METADATA_TYPE_HDR_CLL and METADATA_TYPE_HDR_MDCV, if present (in the configOBUs or in the samples).</assert>
 
 NOTE: The MasteringDisplayColourVolumeBox 'mdcv' and ContentLightLevelBox 'clli' have identical syntax to the SMPTE2086MasteringDisplayMetadataBox 'SmDm' and ContentLightLevelBox 'CoLL', except that they are of type <code>Box</code> and not <code>FullBox</code>. However, the semantics of the MasteringDisplayColourVolumeBox and SMPTE2086MasteringDisplayMetadataBox have important differences and should not be confused.
 
-Additional boxes may be provided at the end of the [=VisualSampleEntry=] as permitted by ISOBMFF, that may represent redundant or similar information to the one provided in some OBUs contained in the [=AV1CodecConfigurationBox=]. If the box definition does not indicate that its information overrides the OBU information, in case of conflict, the OBU information should be considered authoritative.
+<assert>Additional boxes may be provided at the end of the [=VisualSampleEntry=] as permitted by ISOBMFF, that may represent redundant or similar information to the one provided in some OBUs contained in the [=AV1CodecConfigurationBox=]</assert>. If the box definition does not indicate that its information overrides the OBU information, in case of conflict, the OBU information should be considered authoritative.
 
 AV1 Sample Format {#sampleformat}
 ---------------------------------
 
 For tracks using the [=AV1SampleEntry=], an <dfn>AV1 Sample</dfn> has the following constraints:
-- the sample data SHALL be a sequence of [=OBUs=] forming a [=Temporal Unit=],
-- each OBU SHALL follow the [=open_bitstream_unit=] [=Low Overhead Bitstream Format=] syntax as specified in [[!AV1]]. Each OBU SHALL have the [=obu_has_size_field=] set to 1 except for the last OBU in the sample, for which [=obu_has_size_field=] MAY be set to 0, in which case it is assumed to fill the remainder of the sample,
+- <assert>the sample data SHALL be a sequence of [=OBUs=] forming a [=Temporal Unit=]</assert>,
+- <assert>each OBU SHALL follow the [=open_bitstream_unit=] [=Low Overhead Bitstream Format=] syntax as specified in [[!AV1]]</assert>. <assert>Each OBU SHALL have the [=obu_has_size_field=] set to 1 except for the last OBU in the sample</assert>, for which <assert>[=obu_has_size_field=] MAY be set to 0, in which case it is assumed to fill the remainder of the sample</assert>,
 
-NOTE: When extracting OBUs from an ISOBMFF file, and depending on the capabilities of the decoder processing these OBUs, ISOBMFF parsers MAY need to either: set the [=obu_has_size_field=] to 1 for some OBUs if not already set, add the size field in this case, and add [=Temporal Delimiter OBU=]; or use the length-delimited bitstream format as defined in Annex B of [=AV1=]. If encryption is used, similar operations MAY have to be done before or after decryption depending on the demuxer/decryptor/decoder architecture.
+NOTE: <assert>When extracting OBUs from an ISOBMFF file, and depending on the capabilities of the decoder processing these OBUs, ISOBMFF parsers MAY need to either: set the [=obu_has_size_field=] to 1 for some OBUs if not already set, add the size field in this case, and add [=Temporal Delimiter OBU=]; or use the length-delimited bitstream format as defined in Annex B of [=AV1=].</assert> <assert>If encryption is used, similar operations MAY have to be done before or after decryption depending on the demuxer/decryptor/decoder architecture.</assert>
 
-- OBU trailing bits SHOULD be limited to byte alignment and SHOULD not be used for padding,
-- OBUs of type OBU_TEMPORAL_DELIMITER, OBU_PADDING, or OBU_REDUNDANT_FRAME_HEADER SHOULD NOT be used.
-- OBUs of type OBU_TILE_LIST SHALL NOT be used.
+- <assert>OBU trailing bits SHOULD be limited to byte alignment and SHOULD not be used for padding</assert>,
+- <assert>OBUs of type OBU_TEMPORAL_DELIMITER, OBU_PADDING, or OBU_REDUNDANT_FRAME_HEADER SHOULD NOT be used</assert>.
+- <assert>OBUs of type OBU_TILE_LIST SHALL NOT be used</assert>.
 
-If an AV1 Sample is signaled as a sync sample (in the SyncSampleBox or by setting sample_is_non_sync_sample to 0), it SHALL be a Random Access Point as defined in [[!AV1]], i.e. satisfy the following constraints:
+<assert>If an AV1 Sample is signaled as a sync sample (in the SyncSampleBox or by setting sample_is_non_sync_sample to 0), it SHALL be a Random Access Point as defined in [[!AV1]]</assert>, i.e. satisfy the following constraints:
 - Its first frame is a [=Key Frame=] that has [=show_frame=] flag set to 1,
 - It contains a [=Sequence Header OBU=] before the first [=Frame Header OBU=].
 
@@ -386,19 +387,19 @@ NOTE: Within this definition, a sync sample may contain additional frames that a
 
 NOTE: Other types of OBUs such as [=metadata OBUs=] could be present before the [=Sequence Header OBU=].
 
-[=Intra-only frames=] SHOULD be signaled using the sample_depends_on flag set to 2.
+<assert>[=Intra-only frames=] SHOULD be signaled using the sample_depends_on flag set to 2</assert>.
 
-[=Delayed Random Access Points=] SHOULD be signaled using sample groups and the [=AV1ForwardKeyFrameSampleGroupEntry=].
+<assert>[=Delayed Random Access Points=] SHOULD be signaled using sample groups and the [=AV1ForwardKeyFrameSampleGroupEntry=]</assert>.
 
-[=Switch Frames=] SHOULD be signaled using sample groups and the [=AV1SwitchFrameSampleGroupEntry=].
+<assert>[=Switch Frames=] SHOULD be signaled using sample groups and the [=AV1SwitchFrameSampleGroupEntry=]</assert>.
 
-Additionally, if a file contains multiple tracks that are alternative representations of the same content, in particular using [=Switch Frames=], those tracks SHOULD be marked as belonging to the same alternate group and should use a track selection box with an appropriate attribute (e.g. 'bitr').
+Additionally, <assert>if a file contains multiple tracks that are alternative representations of the same content, in particular using [=Switch Frames=], those tracks SHOULD be marked as belonging to the same alternate group</assert> and <assert>should use a track selection box with an appropriate attribute (e.g. 'bitr')</assert>.
 
-In tracks using the [=AV1SampleEntry=], the 'ctts' box and composition offsets in movie fragments SHALL NOT be used. Similarly, the is_leading flag, if used, SHALL be set to 0 or 2.
+<assert>In tracks using the [=AV1SampleEntry=], the 'ctts' box and composition offsets in movie fragments SHALL NOT be used</assert>. Similarly, <assert>the is_leading flag, if used, SHALL be set to 0 or 2</assert>.
 
-When a temporal unit contains more than one frame, the sample corresponding to that temporal unit MAY be marked using the [=AV1MultiFrameSampleGroupEntry=].
+<assert>When a temporal unit contains more than one frame, the sample corresponding to that temporal unit MAY be marked using the [=AV1MultiFrameSampleGroupEntry=]</assert>.
 
-[=Metadata OBUs=] may be carried in sample data. In this case, the [=AV1MetadataSampleGroupEntry=] SHOULD be used. If the [=metadata OBUs=] are static for the entire set of samples associated with a given sample description entry, they SHOULD also be in the OBU array in the sample description entry.
+<assert>[=Metadata OBUs=] may be carried in sample data</assert>. In this case, <assert>the [=AV1MetadataSampleGroupEntry=] SHOULD be used</assert>. <assert>If the [=metadata OBUs=] are static for the entire set of samples associated with a given sample description entry, they SHOULD also be in the OBU array in the sample description entry</assert>.
 
 Unless explicitely stated, the grouping_type_parameter is not defined for the SampleToGroupBox with grouping types defined in this specification.
 
@@ -410,8 +411,8 @@ AV1 Forward Key Frame sample group entry {#forwardkeyframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn export>av1f</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	Mandatory:  No
-	Quantity:   Zero or more.
+	Mandatory:  <assert>No</assert>
+	Quantity:   <assert>Zero or more</assert>.
 </pre>
 
 ### Description ### {#forwardkeyframesamplegroupentry-description}
@@ -439,8 +440,8 @@ AV1 Multi-Frame sample group entry {#multiframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn value export for="AV1MultiFrameSampleGroupEntry">av1m</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	Mandatory:  No
-	Quantity:   Zero or more.
+	Mandatory:  <assert>No</assert>
+	Quantity:   <assert>Zero or more</assert>.
 </pre>
 
 
@@ -464,8 +465,8 @@ AV1 Switch Frame sample group entry {#switchframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn export>av1s</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	Mandatory:  No
-	Quantity:   Zero or more.
+	Mandatory:  <assert>No</assert>
+	Quantity:   <assert>Zero or more</assert>.
 </pre>
 
 
@@ -488,8 +489,8 @@ AV1 Metadata sample group entry {#metadatasamplegroupentry}
 <pre class="def">
 	Group Type: <dfn value noexport for="AV1MetadataSampleGroupEntry">av1M</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	Mandatory:  No
-	Quantity:   Zero or more.
+	Mandatory:  <assert>No</assert>
+	Quantity:   <assert>Zero or more</assert>.
 </pre>
 
 
@@ -517,7 +518,7 @@ For this sample group entry, the <code>grouping_type_parameter</code> syntax is
 
 <dfn export>metadata_type</dfn> is a 8-bit field whose value is the value of the metadata_type field defined in [[!AV1]], when it is equal or lower than 255. metadata_type values above 255 are not supported by this sample group.
 
-<dfn export>metadata_specific_parameters</dfn> provides an additional part of the <code>grouping_type_parameter</code>, which MAY be used to distinguish different sample groups having the same <code>metadata_type</code> but different sub-parameters. In this version of the specification, <code>metadata_specific_parameters</code> is only defined when <code>metadata_type</code> is set to <code>METADATA_TYPE_ITUT_T35</code> in which case its value SHALL be set to the first 24 bits of the <code>metadata_itut_t35</code> structure. For other types of metadata, its value SHOULD be set to 0. In all cases, when the <code>grouping_type_parameter</code> is used, readers processing sample groups SHALL use the entire value of <code>grouping_type_parameter</code>.
+<dfn export>metadata_specific_parameters</dfn> provides an additional part of the <code>grouping_type_parameter</code>, which MAY be used to distinguish different sample groups having the same <code>metadata_type</code> but different sub-parameters. <assert>In this version of the specification, <code>metadata_specific_parameters</code> is only defined when <code>metadata_type</code> is set to <code>METADATA_TYPE_ITUT_T35</code> in which case its value SHALL be set to the first 24 bits of the <code>metadata_itut_t35</code> structure.</assert> <assert>For other types of metadata, its value SHOULD be set to 0. In all cases, when the <code>grouping_type_parameter</code> is used, readers processing sample groups SHALL use the entire value of <code>grouping_type_parameter</code></assert>.
 
 CMAF AV1 track format {#cmaf}
 =====================================================
@@ -525,8 +526,8 @@ CMAF AV1 track format {#cmaf}
 [[CMAF]] defines structural constraints on ISOBMFF files additional to [[ISOBMFF]] for the purpose of, for example, adaptive streaming or for protected files. Conformance to these structural constraints is signaled by the presence of the brand <code>[=cmfc=]</code> in the <code>FileTypeBox</code>.
 
 If a [=CMAF Video Track=] uses the brand <code>av01</code>, it is called a <dfn>CMAF AV1 Track</dfn> and the following constraints, defining the CMAF Media Profile for AV1, apply:
-- it SHALL use an [=AV1SampleEntry=]
-- it MAY use multiple sample entries, and in that case the following values SHALL not change in the track:
+- <assert>it SHALL use an [=AV1SampleEntry=]</assert>
+- <assert>it MAY use multiple sample entries, and in that case the following values SHALL not change in the track</assert>:
     - <code>seq_profile</code>
     - <code>still_picture</code>
     - the first value of <code>seq_level_idx</code>
@@ -534,49 +535,49 @@ If a [=CMAF Video Track=] uses the brand <code>av01</code>, it is called a <dfn>
     - <code>color_config</code>
     - <code>initial_presentation_delay_minus_one</code>
 
-When protected, [=CMAF AV1 Tracks=] SHALL use the signaling defined in [[!CMAF]], which in turn relies on [[!CENC]], with the provisions specified in [[#CommonEncryption]].
+<assert>When protected, [=CMAF AV1 Tracks=] SHALL use the signaling defined in [[!CMAF]], which in turn relies on [[!CENC]], with the provisions specified in [[#CommonEncryption]]</assert>.
 
 Common Encryption {#CommonEncryption}
 =========================
 
-[=CMAF AV1 Tracks=] and non-segmented AV1 files MAY be protected. If protected, they SHALL conform to [[!CENC]]. Files SHOULD be protected using the <code>[=cbcs=]</code> protection scheme and MAY be protected using the <code>[=cenc=]</code> protection scheme.
+<assert>[=CMAF AV1 Tracks=] and non-segmented AV1 files MAY be protected</assert>. <assert>If protected, they SHALL conform to [[!CENC]]</assert>. <assert>Files SHOULD be protected using the <code>[=cbcs=]</code> protection scheme</assert> and <assert>MAY be protected using the <code>[=cenc=]</code> protection scheme</assert>.
 
-When the protected scheme <code>[=cenc=]</code> is used, samples SHALL be protected using subsample encryption and SHALL NOT use pattern encryption.
+<assert>When the protected scheme <code>[=cenc=]</code> is used, samples SHALL be protected using subsample encryption</assert> and <assert>SHALL NOT use pattern encryption</assert>.
 
-When the protected scheme <code>[=cbcs=]</code> is used, samples SHALL be protected using subsample encryption and SHALL use pattern encryption. [[!CENC]] recommends that the Block Pattern length be 10, i.e. <code>crypt_byte_block + skip_byte_block = 10</code>, where a Block is of size 16-bytes. In this specification, the combination of <code>crypt_byte_block</code> and <code>skip_byte_block</code> SHALL be one of the following, with the first one being recommended:
-- <code>crypt_byte_block = 1</code> and <code>skip_byte_block = 9</code>,
-- <code>crypt_byte_block = 5</code> and <code>skip_byte_block = 5</code>,
-- <code>crypt_byte_block = 10</code> and <code>skip_byte_block = 0</code>.
+<assert>When the protected scheme <code>[=cbcs=]</code> is used, samples SHALL be protected using subsample encryption</assert> and <assert>SHALL use pattern encryption</assert>. [[!CENC]] recommends that the Block Pattern length be 10, i.e. <code>crypt_byte_block + skip_byte_block = 10</code>, where a Block is of size 16-bytes. In this specification, the combination of <code>crypt_byte_block</code> and <code>skip_byte_block</code> SHALL be one of the following, with the first one being recommended:
+- <assert><code>crypt_byte_block = 1</code> and <code>skip_byte_block = 9</code></assert>,
+- <assert><code>crypt_byte_block = 5</code> and <code>skip_byte_block = 5</code></assert>,
+- <assert><code>crypt_byte_block = 10</code> and <code>skip_byte_block = 0</code></assert>.
 
 
 General Subsample Encryption constraints {#subsample-encryption}
 --------------------------------------
 
 Within protected samples, the following constraints apply:
-- Protected samples SHALL be exactly spanned by one or more contiguous subsamples.
-	- An OBU MAY be spanned by one or more subsamples, especially when it has multiple ranges of protected data. However, as recommended in [[!CENC]], writers SHOULD reduce the number of subsamples as possible. This can be achieved by using a subsample that spans multiple consecutive unprotected OBUs as well as the first unprotected and protected parts of the following protected OBU, if such protected OBU exists.
-	- A large unprotected OBU whose data size is larger than the maximum size of a single [=BytesOfClearData=] field MAY be spanned by multiple subsamples with zero size [=BytesOfProtectedData=].
-
-- All [=OBU Headers=] and associated [=obu_size=] fields SHALL be unprotected.
-- [=Temporal Delimiter OBUs=], [=Sequence Header OBUs=], and [=Frame Header OBUs=] (including within a [=Frame OBU=]), [=Redundant Frame Header OBUs=] and [=Padding OBUs=] SHALL be unprotected.
-- [=Metadata OBUs=] MAY be protected.
-- [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be protected. Within [=Tile Group OBUs=] or [=Frame OBUs=], the following applies:
+- <assert>Protected samples SHALL be exactly spanned by one or more contiguous subsamples</assert>.
+	- <assert>An OBU MAY be spanned by one or more subsamples</assert>, especially when it has multiple ranges of protected data. However, as recommended in [[!CENC]], writers SHOULD reduce the number of subsamples as possible. This can be achieved by using a subsample that spans multiple consecutive unprotected OBUs as well as the first unprotected and protected parts of the following protected OBU, if such protected OBU exists.
+	- <assert>A large unprotected OBU whose data size is larger than the maximum size of a single [=BytesOfClearData=] field MAY be spanned by multiple subsamples with zero size [=BytesOfProtectedData=]</assert>.
+
+- <assert>All [=OBU Headers=] and associated [=obu_size=] fields SHALL be unprotected</assert>.
+- <assert>[=Temporal Delimiter OBUs=], [=Sequence Header OBUs=], and [=Frame Header OBUs=] (including within a [=Frame OBU=]), [=Redundant Frame Header OBUs=] and [=Padding OBUs=] SHALL be unprotected</assert>.
+- <assert>[=Metadata OBUs=] MAY be protected</assert>.
+- <assert>[=Tile Group OBUs=] and [=Frame OBUs=] SHALL be protected</assert>. Within [=Tile Group OBUs=] or [=Frame OBUs=], the following applies:
 	- for the protected scheme <code>[=cbcs=]</code>:
-		- [=BytesOfProtectedData=] SHALL start on the first byte and end on the last byte of the <code>decode_tile</code> structure (including any trailing bits).
+		- <assert>[=BytesOfProtectedData=] SHALL start on the first byte and end on the last byte of the <code>decode_tile</code> structure (including any trailing bits)</assert>.
 
 	    NOTE: As a result of the above, [=BytesOfProtectedData=] is not necessarily a multiple of 16 bytes and partial blocks are included in the [=BytesOfProtectedData=] range, but per [[!CENC]] the data is not be encrypted.
 
-	    - A subsample SHALL be created for each tile, even if its size is less than 16 bytes.
-		- All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected.
+	    - <assert>A subsample SHALL be created for each tile, even if its size is less than 16 bytes</assert>.
+		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected</assert>.
 
 	- for the protected scheme <code>[=cenc=]</code>:
-	    - [=BytesOfProtectedData=] SHALL be a multiple of 16 bytes.
-	    - [=BytesOfProtectedData=] SHALL end on the last byte of the <code>decode_tile</code> structure (including any trailing bits).
-	    - [=BytesOfProtectedData=] SHALL span all complete 16-byte blocks of the <code>decode_tile</code> structure (including any trailing bits).
+	    - <assert>[=BytesOfProtectedData=] SHALL be a multiple of 16 bytes</assert>.
+	    - <assert>[=BytesOfProtectedData=] SHALL end on the last byte of the <code>decode_tile</code> structure (including any trailing bits)</assert>.
+	    - <assert>[=BytesOfProtectedData=] SHALL span all complete 16-byte blocks of the <code>decode_tile</code> structure (including any trailing bits)</assert>.
 
 	    NOTE: As a result of the above, partial blocks are not used and it is possible that [=BytesOfProtectedData=] does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.
-	    - A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes. If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the [=BytesOfClearData=] field of a surrounding subsample, if any.
-		- All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected.
+	    - <assert>A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes</assert>. <assert>If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the [=BytesOfClearData=] field of a surrounding subsample, if any</assert>.
+		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected</assert>.
 
 Subsample Encryption Illustration {#subsample-encryption-illustration}
 ------------------
@@ -598,25 +599,25 @@ DASH and other applications require defined values for the 'Codecs' parameter sp
 
 All fields following the sample entry 4CC are expressed as double digit decimals, unless indicated otherwise. Leading or trailing zeros cannot be omitted.
 
-The profile parameter value, represented by a single digit decimal, SHALL equal the value of seq_profile in the [=Sequence Header OBU=].
+<assert>The profile parameter value, represented by a single digit decimal, SHALL equal the value of seq_profile in the [=Sequence Header OBU=]</assert>.
 
-The level parameter value SHALL equal the first level value indicated by [=seq_level_idx=] in the [=Sequence Header OBU=].
+<assert>The level parameter value SHALL equal the first level value indicated by [=seq_level_idx=] in the [=Sequence Header OBU=]</assert>.
 
-The tier parameter value SHALL be equal to <code>M</code> when the first [=seq_tier=] value in the [=Sequence Header OBU=] is equal to 0, and <code>H</code> when it is equal to 1.
+<assert>The tier parameter value SHALL be equal to <code>M</code> when the first [=seq_tier=] value in the [=Sequence Header OBU=] is equal to 0, and <code>H</code> when it is equal to 1</assert>.
 
-The bitDepth parameter value SHALL equal the value of BitDepth variable as defined in [[AV1]] derived from the [=Sequence Header OBU=].
+<assert>The bitDepth parameter value SHALL equal the value of BitDepth variable as defined in [[AV1]] derived from the [=Sequence Header OBU=]</assert>.
 
-The monochrome parameter value, represented by a single digit decimal, SHALL equal the value of mono_chrome in the [=Sequence Header OBU=].
+<assert>The monochrome parameter value, represented by a single digit decimal, SHALL equal the value of mono_chrome in the [=Sequence Header OBU=]</assert>.
 
-The chromaSubsampling parameter value, represented by a three-digit decimal, SHALL have its first digit equal to subsampling_x and its second digit equal to subsampling_y. If both subsampling_x and subsampling_y are set to 1, then the third digit SHALL be equal to chroma_sample_position, otherwise it SHALL be set to 0.
+<assert>The chromaSubsampling parameter value, represented by a three-digit decimal, SHALL have its first digit equal to subsampling_x and its second digit equal to subsampling_y</assert>. <assert>If both subsampling_x and subsampling_y are set to 1, then the third digit SHALL be equal to chroma_sample_position, otherwise it SHALL be set to 0</assert>.
 
-The colorPrimaries, transferCharacteristics, matrixCoefficients, and videoFullRangeFlag parameter values SHALL equal the value of matching fields in the [=Sequence Header OBU=], if color_description_present_flag is set to 1, otherwise they SHOULD not be set, defaulting to the values below. The videoFullRangeFlag is represented by a single digit.
+<assert>The colorPrimaries, transferCharacteristics, matrixCoefficients, and videoFullRangeFlag parameter values SHALL equal the value of matching fields in the [=Sequence Header OBU=], if color_description_present_flag is set to 1</assert>, <assert>otherwise they SHOULD not be set, defaulting to the values below</assert>. The videoFullRangeFlag is represented by a single digit.
 
 For example, codecs="av01.0.04M.10.0.112.09.16.09.0" represents AV1 Main Profile, level 3.0, Main tier, 10-bit content, non-monochrome, with 4:2:0 chroma subsampling co-located with (0, 0) luma sample, ITU-R BT.2100 color primaries, ITU-R BT.2100 PQ transfer characteristics, ITU-R BT.2100 YCbCr color matrix, and studio swing representation.
 
-The parameters sample entry 4CC, profile, level, tier, and bitDepth are all mandatory fields. If any of these fields are empty, or not within their allowed range, the processing device SHOULD treat it as an error.
+<assert>The parameters sample entry 4CC, profile, level, tier, and bitDepth are all mandatory fields</assert>. If any of these fields are empty, or not within their allowed range, the processing device SHOULD treat it as an error.
 
-All the other fields (including their leading '.') are optional, mutually inclusive (all or none) fields. If not specified then the values listed in the table below are assumed.
+<assert>All the other fields (including their leading '.') are optional, mutually inclusive (all or none) fields</assert>. If not specified then the values listed in the table below are assumed.
 
 <table class="def">
 <tr>

From 89f356c22d62fd8ed3ae3cb383748df574b08b86 Mon Sep 17 00:00:00 2001
From: Dimitri Podborski <dpodborski@apple.com>
Date: Wed, 17 May 2023 18:27:53 -0700
Subject: [PATCH 04/12] fix closing assert tag

---
 index.bs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/index.bs b/index.bs
index 251453b..ad32cd5 100644
--- a/index.bs
+++ b/index.bs
@@ -577,7 +577,7 @@ Within protected samples, the following constraints apply:
 	    - <assert>[=BytesOfProtectedData=] SHALL span all complete 16-byte blocks of the <code>decode_tile</code> structure (including any trailing bits)</assert>.
 
 	    NOTE: As a result of the above, partial blocks are not used and it is possible that [=BytesOfProtectedData=] does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.
-	    - <assert>A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes<assert>. <assert>If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the [=BytesOfClearData=] field of a surrounding subsample, if any</assert>.
+	    - <assert>A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes</assert>. <assert>If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the [=BytesOfClearData=] field of a surrounding subsample, if any</assert>.
 		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected</assert>.
 
 Subsample Encryption Illustration {#subsample-encryption-illustration}

From 61b1746fa5bbc0b94100eab194bef5961db1c4b6 Mon Sep 17 00:00:00 2001
From: Dimitri Podborski <dpodborski@apple.com>
Date: Mon, 26 Jun 2023 09:29:07 -0700
Subject: [PATCH 05/12] run the latest bikeshed version on the updated .bs file

---
 v1.2.0.html | 2471 +++++++++++++++++++++++++--------------------------
 1 file changed, 1209 insertions(+), 1262 deletions(-)

diff --git a/v1.2.0.html b/v1.2.0.html
index e6c6035..fd73661 100644
--- a/v1.2.0.html
+++ b/v1.2.0.html
@@ -1,7 +1,6 @@
-<!DOCTYPE html>
-<!-- saved from url=(0043)https://aomediacodec.github.io/av1-isobmff/ -->
-<html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
-  
+<!doctype html><html lang="en">
+ <head>
+  <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
   <title>AV1 Codec ISO Media File Format Binding</title>
   <meta content="width=device-width, initial-scale=1, shrink-to-fit=no" name="viewport">
 <style data-fill-with="stylesheet">/******************************************************************************
@@ -1239,14 +1238,15 @@
 			grid-column: 2;
 			width: auto;
 			margin-right: 1rem;
+			border-bottom: 3px solid transparent;
+			margin-bottom: -3px;
 		}
 		#toc .content:hover,
 		#toc .content:focus {
 			background: rgba(75%, 75%, 75%, .25);
 			background: var(--a-hover-bg);
-			border-bottom: 3px solid #054572;
-			border-bottom: 3px solid var(--toclink-underline);
-			margin-bottom: -3px;
+			border-bottom-color: #054572;
+			border-bottom-color: var(--toclink-underline);
 		}
 		#toc li li li .content {
 			margin-left: 1rem;
@@ -1270,7 +1270,7 @@
 	ul.index ul,
 	ul.index dl { font-size: smaller; }
 	@media not print {
-		ul.index li span:not(.dfn-paneled) {
+		ul.index li a + span {
 			white-space: nowrap;
 			color: transparent; }
 		ul.index li a:hover + span,
@@ -1488,11 +1488,9 @@
 		}
 	}
 </style>
-  <meta content="Bikeshed version dfbc2b297, updated Thu Nov 11 15:52:32 2021 -0800" name="generator">
+  <meta content="Bikeshed version 5edf5e459, updated Thu Jun 22 11:28:01 2023 -0700" name="generator">
   <link href="https://aomediacodec.github.io/av1-isobmff/" rel="canonical">
-  <meta content="91ae751e7ef9d7969041c7ba2966160c99a5e16f" name="document-revision">
-<style>/* style-autolinks */
-
+<style>/* Boilerplate: style-autolinks */
 .css.css, .property.property, .descriptor.descriptor {
     color: var(--a-normal-text);
     font-size: inherit;
@@ -1552,8 +1550,17 @@
 
 [data-link-type=biblio] {
     white-space: pre;
-}</style>
-<style>/* style-colors */
+}
+
+@media (prefers-color-scheme: dark) {
+    :root {
+        --selflink-text: black;
+        --selflink-bg: silver;
+        --selflink-hover-text: white;
+    }
+}
+</style>
+<style>/* Boilerplate: style-colors */
 
 /* Any --*-text not paired with a --*-bg is assumed to have a transparent bg */
 :root {
@@ -1661,9 +1668,121 @@
     --outdated-shadow: red;
 
     --editedrec-bg: darkorange;
-}</style>
-<style>/* style-counters */
+}
+
+@media (prefers-color-scheme: dark) {
+    :root {
+        --text: #ddd;
+        --bg: black;
+
+        --unofficial-watermark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='400' height='400'%3E%3Cg fill='%23100808' transform='translate(200 200) rotate(-45) translate(-200 -200)' stroke='%23100808' stroke-width='3'%3E%3Ctext x='50%25' y='220' style='font: bold 70px sans-serif; text-anchor: middle; letter-spacing: 6px;'%3EUNOFFICIAL%3C/text%3E%3Ctext x='50%25' y='305' style='font: bold 70px sans-serif; text-anchor: middle; letter-spacing: 6px;'%3EDRAFT%3C/text%3E%3C/g%3E%3C/svg%3E");
+
+        --logo-bg: #1a5e9a;
+        --logo-active-bg: #c00;
+        --logo-text: white;
+
+        --tocnav-normal-text: #999;
+        --tocnav-normal-bg: var(--bg);
+        --tocnav-hover-text: var(--tocnav-normal-text);
+        --tocnav-hover-bg: #080808;
+        --tocnav-active-text: #f44;
+        --tocnav-active-bg: var(--tocnav-normal-bg);
+
+        --tocsidebar-text: var(--text);
+        --tocsidebar-bg: #080808;
+        --tocsidebar-shadow: rgba(255,255,255,.1);
+        --tocsidebar-heading-text: hsla(203,20%,40%,.7);
+
+        --toclink-text: var(--text);
+        --toclink-underline: #6af;
+        --toclink-visited-text: var(--toclink-text);
+        --toclink-visited-underline: #054572;
+
+        --heading-text: #8af;
+
+        --hr-text: var(--text);
 
+        --algo-border: #456;
+
+        --del-text: #f44;
+        --del-bg: transparent;
+        --ins-text: #4a4;
+        --ins-bg: transparent;
+
+        --a-normal-text: #6af;
+        --a-normal-underline: #555;
+        --a-visited-text: var(--a-normal-text);
+        --a-visited-underline: var(--a-normal-underline);
+        --a-hover-bg: rgba(25%, 25%, 25%, .2);
+        --a-active-text: #f44;
+        --a-active-underline: var(--a-active-text);
+
+        --borderedblock-bg: rgba(255, 255, 255, .05);
+
+        --blockquote-border: silver;
+        --blockquote-bg: var(--borderedblock-bg);
+        --blockquote-text: currentcolor;
+
+        --issue-border: #e05252;
+        --issue-bg: var(--borderedblock-bg);
+        --issue-text: var(--text);
+        --issueheading-text: hsl(0deg, 70%, 70%);
+
+        --example-border: hsl(50deg, 90%, 60%);
+        --example-bg: var(--borderedblock-bg);
+        --example-text: var(--text);
+        --exampleheading-text: hsl(50deg, 70%, 70%);
+
+        --note-border: hsl(120deg, 100%, 35%);
+        --note-bg: var(--borderedblock-bg);
+        --note-text: var(--text);
+        --noteheading-text: hsl(120, 70%, 70%);
+        --notesummary-underline: silver;
+
+        --assertion-border: #444;
+        --assertion-bg: var(--borderedblock-bg);
+        --assertion-text: var(--text);
+
+        --advisement-border: orange;
+        --advisement-bg: #222218;
+        --advisement-text: var(--text);
+        --advisementheading-text: #f84;
+
+        --warning-border: red;
+        --warning-bg: hsla(40,100%,20%,0.95);
+        --warning-text: var(--text);
+
+        --amendment-border: #330099;
+        --amendment-bg: #080010;
+        --amendment-text: var(--text);
+        --amendmentheading-text: #cc00ff;
+
+        --def-border: #8ccbf2;
+        --def-bg: #080818;
+        --def-text: var(--text);
+        --defrow-border: #136;
+
+        --datacell-border: silver;
+
+        --indexinfo-text: #aaa;
+
+        --indextable-hover-text: var(--text);
+        --indextable-hover-bg: #181818;
+
+        --outdatedspec-bg: rgba(255, 255, 255, .5);
+        --outdatedspec-text: black;
+        --outdated-bg: maroon;
+        --outdated-text: white;
+        --outdated-shadow: red;
+
+        --editedrec-bg: darkorange;
+    }
+    /* In case a transparent-bg image doesn't expect to be on a dark bg,
+       which is quite common in practice... */
+    img { background: white; }
+}
+</style>
+<style>/* Boilerplate: style-counters */
 body {
     counter-reset: example figure issue;
 }
@@ -1690,20 +1809,25 @@
 }
 figcaption:not(.no-marker)::before {
     content: "Figure " counter(figure) " ";
-}</style>
-<style>/* style-dfn-panel */
-
+}
+</style>
+<style>/* Boilerplate: style-dfn-panel */
 :root {
     --dfnpanel-bg: #ddd;
     --dfnpanel-text: var(--text);
 }
+@media (prefers-color-scheme: dark) {
+    :root {
+        --dfnpanel-bg: #222;
+        --dfnpanel-text: var(--text);
+    }
+}
 .dfn-panel {
     position: absolute;
     z-index: 35;
+    width: 20em;
+    width: 300px;
     height: auto;
-    width: -webkit-fit-content;
-    width: fit-content;
-    max-width: 300px;
     max-height: 500px;
     overflow: auto;
     padding: 0.5em 0.75em;
@@ -1711,6 +1835,7 @@
     background: var(--dfnpanel-bg);
     color: var(--dfnpanel-text);
     border: outset 0.2em;
+    white-space: normal; /* in case it's moved into a pre */
 }
 .dfn-panel:not(.on) { display: none; }
 .dfn-panel * { margin: 0; padding: 0; text-indent: 0; }
@@ -1718,8 +1843,15 @@
 .dfn-panel a { color: var(--dfnpanel-text); }
 .dfn-panel a:not(:hover) { text-decoration: none !important; border-bottom: none !important; }
 .dfn-panel > b + b { margin-top: 0.25em; }
-.dfn-panel ul { padding: 0; }
-.dfn-panel li { list-style: inside; }
+.dfn-panel ul { padding: 0 0 0 1em; list-style: none; }
+.dfn-panel li a {
+    white-space: pre;
+    display: inline-block;
+    max-width: calc(300px - 1.5em - 1em);
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+
 .dfn-panel.activated {
     display: inline-block;
     position: fixed;
@@ -1730,10 +1862,62 @@
     max-height: 30vh;
 }
 
-.dfn-paneled { cursor: pointer; }
+.dfn-paneled[role="button"] { cursor: pointer; }
 </style>
-<style>/* style-issues */
+<style>/* Boilerplate: style-dfn-panel */
+:root {
+    --dfnpanel-bg: #ddd;
+    --dfnpanel-text: var(--text);
+}
+@media (prefers-color-scheme: dark) {
+    :root {
+        --dfnpanel-bg: #222;
+        --dfnpanel-text: var(--text);
+    }
+}
+.dfn-panel {
+    position: absolute;
+    z-index: 35;
+    width: 20em;
+    width: 300px;
+    height: auto;
+    max-height: 500px;
+    overflow: auto;
+    padding: 0.5em 0.75em;
+    font: small Helvetica Neue, sans-serif, Droid Sans Fallback;
+    background: var(--dfnpanel-bg);
+    color: var(--dfnpanel-text);
+    border: outset 0.2em;
+    white-space: normal; /* in case it's moved into a pre */
+}
+.dfn-panel:not(.on) { display: none; }
+.dfn-panel * { margin: 0; padding: 0; text-indent: 0; }
+.dfn-panel > b { display: block; }
+.dfn-panel a { color: var(--dfnpanel-text); }
+.dfn-panel a:not(:hover) { text-decoration: none !important; border-bottom: none !important; }
+.dfn-panel > b + b { margin-top: 0.25em; }
+.dfn-panel ul { padding: 0 0 0 1em; list-style: none; }
+.dfn-panel li a {
+    white-space: pre;
+    display: inline-block;
+    max-width: calc(300px - 1.5em - 1em);
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
 
+.dfn-panel.activated {
+    display: inline-block;
+    position: fixed;
+    left: .5em;
+    bottom: 2em;
+    margin: 0 auto;
+    max-width: calc(100vw - 1.5em - .4em - .5em);
+    max-height: 30vh;
+}
+
+.dfn-paneled[role="button"] { cursor: pointer; }
+</style>
+<style>/* Boilerplate: style-issues */
 a[href].issue-return {
     float: right;
     float: inline-end;
@@ -1742,8 +1926,7 @@
     text-decoration: none;
 }
 </style>
-<style>/* style-md-lists */
-
+<style>/* Boilerplate: style-md-lists */
 /* This is a weird hack for me not yet following the commonmark spec
    regarding paragraph and lists. */
 [data-md] > :first-child {
@@ -1751,8 +1934,9 @@
 }
 [data-md] > :last-child {
     margin-bottom: 0;
-}</style>
-<style>/* style-selflinks */
+}
+</style>
+<style>/* Boilerplate: style-selflinks */
 
 :root {
     --selflink-text: white;
@@ -1779,6 +1963,14 @@
 .heading > a.self-link {
     font-size: 83%;
 }
+.example > a.self-link,
+.note > a.self-link,
+.issue > a.self-link {
+    /* These blocks are overflow:auto, so positioning outside
+       doesn't work. */
+    left: auto;
+    right: 0;
+}
 li > a.self-link {
     left: calc(-1 * (3.5rem - 26px) - 2em);
 }
@@ -1804,309 +1996,173 @@
 .heading > a.self-link::before { content: "§"; }
 dfn > a.self-link::before      { content: "#"; }
 </style>
-<style>/* style-darkmode */
-
-@media (prefers-color-scheme: dark) {
-    :root {
-        --text: #ddd;
-        --bg: black;
-
-        --unofficial-watermark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='400' height='400'%3E%3Cg fill='%23100808' transform='translate(200 200) rotate(-45) translate(-200 -200)' stroke='%23100808' stroke-width='3'%3E%3Ctext x='50%25' y='220' style='font: bold 70px sans-serif; text-anchor: middle; letter-spacing: 6px;'%3EUNOFFICIAL%3C/text%3E%3Ctext x='50%25' y='305' style='font: bold 70px sans-serif; text-anchor: middle; letter-spacing: 6px;'%3EDRAFT%3C/text%3E%3C/g%3E%3C/svg%3E");
-
-        --logo-bg: #1a5e9a;
-        --logo-active-bg: #c00;
-        --logo-text: white;
-
-        --tocnav-normal-text: #999;
-        --tocnav-normal-bg: var(--bg);
-        --tocnav-hover-text: var(--tocnav-normal-text);
-        --tocnav-hover-bg: #080808;
-        --tocnav-active-text: #f44;
-        --tocnav-active-bg: var(--tocnav-normal-bg);
-
-        --tocsidebar-text: var(--text);
-        --tocsidebar-bg: #080808;
-        --tocsidebar-shadow: rgba(255,255,255,.1);
-        --tocsidebar-heading-text: hsla(203,20%,40%,.7);
-
-        --toclink-text: var(--text);
-        --toclink-underline: #6af;
-        --toclink-visited-text: var(--toclink-text);
-        --toclink-visited-underline: #054572;
-
-        --heading-text: #8af;
-
-        --hr-text: var(--text);
-
-        --algo-border: #456;
-
-        --del-text: #f44;
-        --del-bg: transparent;
-        --ins-text: #4a4;
-        --ins-bg: transparent;
-
-        --a-normal-text: #6af;
-        --a-normal-underline: #555;
-        --a-visited-text: var(--a-normal-text);
-        --a-visited-underline: var(--a-normal-underline);
-        --a-hover-bg: rgba(25%, 25%, 25%, .2);
-        --a-active-text: #f44;
-        --a-active-underline: var(--a-active-text);
-
-        --borderedblock-bg: rgba(255, 255, 255, .05);
-
-        --blockquote-border: silver;
-        --blockquote-bg: var(--borderedblock-bg);
-        --blockquote-text: currentcolor;
-
-        --issue-border: #e05252;
-        --issue-bg: var(--borderedblock-bg);
-        --issue-text: var(--text);
-        --issueheading-text: hsl(0deg, 70%, 70%);
-
-        --example-border: hsl(50deg, 90%, 60%);
-        --example-bg: var(--borderedblock-bg);
-        --example-text: var(--text);
-        --exampleheading-text: hsl(50deg, 70%, 70%);
-
-        --note-border: hsl(120deg, 100%, 35%);
-        --note-bg: var(--borderedblock-bg);
-        --note-text: var(--text);
-        --noteheading-text: hsl(120, 70%, 70%);
-        --notesummary-underline: silver;
-
-        --assertion-border: #444;
-        --assertion-bg: var(--borderedblock-bg);
-        --assertion-text: var(--text);
-
-        --advisement-border: orange;
-        --advisement-bg: #222218;
-        --advisement-text: var(--text);
-        --advisementheading-text: #f84;
-
-        --warning-border: red;
-        --warning-bg: hsla(40,100%,20%,0.95);
-        --warning-text: var(--text);
-
-        --amendment-border: #330099;
-        --amendment-bg: #080010;
-        --amendment-text: var(--text);
-        --amendmentheading-text: #cc00ff;
-
-        --def-border: #8ccbf2;
-        --def-bg: #080818;
-        --def-text: var(--text);
-        --defrow-border: #136;
-
-        --datacell-border: silver;
-
-        --indexinfo-text: #aaa;
-
-        --indextable-hover-text: var(--text);
-        --indextable-hover-bg: #181818;
-
-        --outdatedspec-bg: rgba(255, 255, 255, .5);
-        --outdatedspec-text: black;
-        --outdated-bg: maroon;
-        --outdated-text: white;
-        --outdated-shadow: red;
-
-        --editedrec-bg: darkorange;
-    }
-    /* In case a transparent-bg image doesn't expect to be on a dark bg,
-       which is quite common in practice... */
-    img { background: white; }
-}
-@media (prefers-color-scheme: dark) {
-    :root {
-        --selflink-text: black;
-        --selflink-bg: silver;
-        --selflink-hover-text: white;
-    }
-}
-
-@media (prefers-color-scheme: dark) {
-    :root {
-        --dfnpanel-bg: #222;
-        --dfnpanel-text: var(--text);
-    }
-}</style>
- </head><body class="h-entry toc-sidebar"><p id="toc-nav"><a id="toc-jump" href="https://aomediacodec.github.io/av1-isobmff/#toc"><span aria-hidden="true">↑</span> <span>Jump to Table of Contents</span></a><a id="toc-toggle" href="https://aomediacodec.github.io/av1-isobmff/#toc"><span aria-hidden="true">←</span> <span>Collapse Sidebar</span></a></p>
+ <body class="h-entry">
   <div class="head">
-   <p data-fill-with="logo"><a class="logo" href="https://www.aomedia.org/"> <img alt="AOM" height="174" src="./v1.2.0_files/aomedia-icon-only.png" width="174"> </a> </p>
+   <p data-fill-with="logo"><a class="logo" href="https://www.aomedia.org/" style="width: 200px"> <img alt="AOM" height="60" src="https://aomedia.org/assets/images/aomedia-logo-rgb.svg" width="200"> </a> </p>
    <h1 class="p-name no-ref" id="title">AV1 Codec ISO Media File Format Binding</h1>
    <h2 class="p-name no-num no-toc no-ref heading settled" id="subtitle"><span class="content">v1.2.0</span></h2>
    <h3 class="no-num no-toc no-ref heading settled" id="profile-and-date"><span class="content">AOM Final Deliverable, <time class="dt-updated" datetime="2019-12-12">12 December 2019</time></span></h3>
    <div data-fill-with="spec-metadata">
     <dl>
      <dt>This version:
-     <dd><a class="u-url" href="https://aomediacodec.github.io/av1-isobmff/v1.2.0.html">https://aomediacodec.github.io/av1-isobmff/v1.2.0.html</a>
-     <dt>Latest version:
      <dd><a class="u-url" href="https://aomediacodec.github.io/av1-isobmff/">https://aomediacodec.github.io/av1-isobmff/</a>
-     </dd><dt>Issue Tracking:
-     </dt><dd><a href="https://github.com/AOMediaCodec/av1-isobmff/issues/">GitHub</a>
-     </dd><dt class="editor">Editors:
-     </dt><dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:cconcolato@netflix.com">Cyril Concolato</a> (<span class="p-org org">Netflix</span>)
-     </dd><dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:tom.finegan@google.com">Tom Finegan</a> (<span class="p-org org">Google</span>)
-     </dd><dt>Previously approved version:
-     </dt><dd><a href="https://aomediacodec.github.io/av1-isobmff/v1.1.0.html">v1.1.0</a>
-    </dd></dl>
+     <dt>Issue Tracking:
+     <dd><a href="https://github.com/AOMediaCodec/av1-isobmff/issues/">GitHub</a>
+     <dt class="editor">Editors:
+     <dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:cconcolato@netflix.com">Cyril Concolato</a> (<span class="p-org org">Netflix</span>)
+     <dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:tom.finegan@google.com">Tom Finegan</a> (<span class="p-org org">Google</span>)
+     <dt>Previously approved version:
+     <dd><a href="v1.1.0.html">v1.1.0</a>
+    </dl>
    </div>
    <div data-fill-with="warning"></div>
    <p class="copyright" data-fill-with="copyright">
-    </p><p>Copyright 2019, <a href="https://aomedia.org/">AOM</a></p>
+    <p>Copyright 2019, <a href="https://aomedia.org">AOM</a></p>
     <p>Licensing information is available at <a href="http://aomedia.org/license/">http://aomedia.org/license/</a></p>
     <p>The MATERIALS ARE PROVIDED “AS IS.” The Alliance for Open Media, its members, and its contributors expressly disclaim any warranties (express, implied, or otherwise), including implied warranties of merchantability, non-infringement, fitness for a particular purpose, or title, related to the materials. The entire risk as to implementing or otherwise using the materials is assumed by the implementer and user. IN NO EVENT WILL THE ALLIANCE FOR OPEN MEDIA, ITS MEMBERS, OR CONTRIBUTORS BE LIABLE TO ANY OTHER PARTY FOR LOST PROFITS OR ANY FORM OF INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OF ANY CHARACTER FROM ANY CAUSES OF ACTION OF ANY KIND WITH RESPECT TO THIS DELIVERABLE OR ITS GOVERNING AGREEMENT, WHETHER BASED ON BREACH OF CONTRACT, TORT (INCLUDING NEGLIGENCE), OR OTHERWISE, AND WHETHER OR NOT THE OTHER MEMBER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</p>
-   <p></p>
+   </p>
    <hr title="Separator for header">
   </div>
   <div class="p-summary" data-fill-with="abstract">
    <h2 class="no-num no-toc no-ref heading settled" id="abstract"><span class="content">Abstract</span></h2>
-   <p>This document specifies the storage format for <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a> bitstreams in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-isobmff">[ISOBMFF]</a> tracks as well as in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cmaf">[CMAF]</a> files.</p>
+   <p>This document specifies the storage format for <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a> bitstreams in <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a> tracks as well as in <a data-link-type="biblio" href="#biblio-cmaf" title="Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media">[CMAF]</a> files.</p>
   </div>
   <nav data-fill-with="table-of-contents" id="toc">
    <h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
    <ol class="toc" role="directory">
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#bitstream-overview"><span class="secno">1</span> <span class="content">Bitstream features overview</span></a>
-    </li><li>
-     <a href="https://aomediacodec.github.io/av1-isobmff/#basic-encapsulation"><span class="secno">2</span> <span class="content">Basic Encapsulation Scheme</span></a>
+    <li><a href="#bitstream-overview"><span class="secno">1</span> <span class="content">Bitstream features overview</span></a>
+    <li>
+     <a href="#basic-encapsulation"><span class="secno">2</span> <span class="content">Basic Encapsulation Scheme</span></a>
      <ol class="toc">
-      <li><a href="https://aomediacodec.github.io/av1-isobmff/#brands"><span class="secno">2.1</span> <span class="content">General Requirements &amp; Brands</span></a>
-      </li><li>
-       <a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-section"><span class="secno">2.2</span> <span class="content">AV1 Sample Entry</span></a>
+      <li><a href="#brands"><span class="secno">2.1</span> <span class="content">General Requirements &amp; Brands</span></a>
+      <li>
+       <a href="#av1sampleentry-section"><span class="secno">2.2</span> <span class="content">AV1 Sample Entry</span></a>
        <ol class="toc">
-        <li><a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-definition"><span class="secno">2.2.1</span> <span class="content">Definition</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-description"><span class="secno">2.2.2</span> <span class="content">Description</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-syntax"><span class="secno">2.2.3</span> <span class="content">Syntax</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-semantics"><span class="secno">2.2.4</span> <span class="content">Semantics</span></a>
-       </li></ol>
-      </li><li>
-       <a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-section"><span class="secno">2.3</span> <span class="content">AV1 Codec Configuration Box</span></a>
+        <li><a href="#av1sampleentry-definition"><span class="secno">2.2.1</span> <span class="content">Definition</span></a>
+        <li><a href="#av1sampleentry-description"><span class="secno">2.2.2</span> <span class="content">Description</span></a>
+        <li><a href="#av1sampleentry-syntax"><span class="secno">2.2.3</span> <span class="content">Syntax</span></a>
+        <li><a href="#av1sampleentry-semantics"><span class="secno">2.2.4</span> <span class="content">Semantics</span></a>
+       </ol>
+      <li>
+       <a href="#av1codecconfigurationbox-section"><span class="secno">2.3</span> <span class="content">AV1 Codec Configuration Box</span></a>
        <ol class="toc">
-        <li><a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-definition"><span class="secno">2.3.1</span> <span class="content">Definition</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-description"><span class="secno">2.3.2</span> <span class="content">Description</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-syntax"><span class="secno">2.3.3</span> <span class="content">Syntax</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-semantics"><span class="secno">2.3.4</span> <span class="content">Semantics</span></a>
-       </li></ol>
-      </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#sampleformat"><span class="secno">2.4</span> <span class="content">AV1 Sample Format</span></a>
-      </li><li>
-       <a href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry"><span class="secno">2.5</span> <span class="content">AV1 Forward Key Frame sample group entry</span></a>
+        <li><a href="#av1codecconfigurationbox-definition"><span class="secno">2.3.1</span> <span class="content">Definition</span></a>
+        <li><a href="#av1codecconfigurationbox-description"><span class="secno">2.3.2</span> <span class="content">Description</span></a>
+        <li><a href="#av1codecconfigurationbox-syntax"><span class="secno">2.3.3</span> <span class="content">Syntax</span></a>
+        <li><a href="#av1codecconfigurationbox-semantics"><span class="secno">2.3.4</span> <span class="content">Semantics</span></a>
+       </ol>
+      <li><a href="#sampleformat"><span class="secno">2.4</span> <span class="content">AV1 Sample Format</span></a>
+      <li>
+       <a href="#forwardkeyframesamplegroupentry"><span class="secno">2.5</span> <span class="content">AV1 Forward Key Frame sample group entry</span></a>
        <ol class="toc">
-        <li><a href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-definition"><span class="secno">2.5.1</span> <span class="content">Definition</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-description"><span class="secno">2.5.2</span> <span class="content">Description</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-syntax"><span class="secno">2.5.3</span> <span class="content">Syntax</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-semantics"><span class="secno">2.5.4</span> <span class="content">Semantics</span></a>
-       </li></ol>
-      </li><li>
-       <a href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry"><span class="secno">2.6</span> <span class="content">AV1 Multi-Frame sample group entry</span></a>
+        <li><a href="#forwardkeyframesamplegroupentry-definition"><span class="secno">2.5.1</span> <span class="content">Definition</span></a>
+        <li><a href="#forwardkeyframesamplegroupentry-description"><span class="secno">2.5.2</span> <span class="content">Description</span></a>
+        <li><a href="#forwardkeyframesamplegroupentry-syntax"><span class="secno">2.5.3</span> <span class="content">Syntax</span></a>
+        <li><a href="#forwardkeyframesamplegroupentry-semantics"><span class="secno">2.5.4</span> <span class="content">Semantics</span></a>
+       </ol>
+      <li>
+       <a href="#multiframesamplegroupentry"><span class="secno">2.6</span> <span class="content">AV1 Multi-Frame sample group entry</span></a>
        <ol class="toc">
-        <li><a href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry-definition"><span class="secno">2.6.1</span> <span class="content">Definition</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry-description"><span class="secno">2.6.2</span> <span class="content">Description</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry-syntax"><span class="secno">2.6.3</span> <span class="content">Syntax</span></a>
-       </li></ol>
-      </li><li>
-       <a href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry"><span class="secno">2.7</span> <span class="content">AV1 Switch Frame sample group entry</span></a>
+        <li><a href="#multiframesamplegroupentry-definition"><span class="secno">2.6.1</span> <span class="content">Definition</span></a>
+        <li><a href="#multiframesamplegroupentry-description"><span class="secno">2.6.2</span> <span class="content">Description</span></a>
+        <li><a href="#multiframesamplegroupentry-syntax"><span class="secno">2.6.3</span> <span class="content">Syntax</span></a>
+       </ol>
+      <li>
+       <a href="#switchframesamplegroupentry"><span class="secno">2.7</span> <span class="content">AV1 Switch Frame sample group entry</span></a>
        <ol class="toc">
-        <li><a href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry-definition"><span class="secno">2.7.1</span> <span class="content">Definition</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry-description"><span class="secno">2.7.2</span> <span class="content">Description</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry-syntax"><span class="secno">2.7.3</span> <span class="content">Syntax</span></a>
-       </li></ol>
-      </li><li>
-       <a href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry"><span class="secno">2.8</span> <span class="content">AV1 Metadata sample group entry</span></a>
+        <li><a href="#switchframesamplegroupentry-definition"><span class="secno">2.7.1</span> <span class="content">Definition</span></a>
+        <li><a href="#switchframesamplegroupentry-description"><span class="secno">2.7.2</span> <span class="content">Description</span></a>
+        <li><a href="#switchframesamplegroupentry-syntax"><span class="secno">2.7.3</span> <span class="content">Syntax</span></a>
+       </ol>
+      <li>
+       <a href="#metadatasamplegroupentry"><span class="secno">2.8</span> <span class="content">AV1 Metadata sample group entry</span></a>
        <ol class="toc">
-        <li><a href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-definition"><span class="secno">2.8.1</span> <span class="content">Definition</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-description"><span class="secno">2.8.2</span> <span class="content">Description</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-syntax"><span class="secno">2.8.3</span> <span class="content">Syntax</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-semantics"><span class="secno">2.8.4</span> <span class="content">Semantics</span></a>
-       </li></ol>
-     </li></ol>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#cmaf"><span class="secno">3</span> <span class="content">CMAF AV1 track format</span></a>
-    </li><li>
-     <a href="https://aomediacodec.github.io/av1-isobmff/#CommonEncryption"><span class="secno">4</span> <span class="content">Common Encryption</span></a>
+        <li><a href="#metadatasamplegroupentry-definition"><span class="secno">2.8.1</span> <span class="content">Definition</span></a>
+        <li><a href="#metadatasamplegroupentry-description"><span class="secno">2.8.2</span> <span class="content">Description</span></a>
+        <li><a href="#metadatasamplegroupentry-syntax"><span class="secno">2.8.3</span> <span class="content">Syntax</span></a>
+        <li><a href="#metadatasamplegroupentry-semantics"><span class="secno">2.8.4</span> <span class="content">Semantics</span></a>
+       </ol>
+     </ol>
+    <li><a href="#cmaf"><span class="secno">3</span> <span class="content">CMAF AV1 track format</span></a>
+    <li>
+     <a href="#CommonEncryption"><span class="secno">4</span> <span class="content">Common Encryption</span></a>
      <ol class="toc">
-      <li><a href="https://aomediacodec.github.io/av1-isobmff/#subsample-encryption"><span class="secno">4.1</span> <span class="content">General Subsample Encryption constraints</span></a>
-      </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#subsample-encryption-illustration"><span class="secno">4.2</span> <span class="content">Subsample Encryption Illustration</span></a>
-     </li></ol>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#codecsparam"><span class="secno">5</span> <span class="content">Codecs Parameter String</span></a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#changelist"><span class="secno">6</span> <span class="content">Changes since v1.1.0 release</span></a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#conformance"><span class="secno"></span> <span class="content"> Conformance</span></a>
-    </li><li>
-     <a href="https://aomediacodec.github.io/av1-isobmff/#index"><span class="secno"></span> <span class="content">Index</span></a>
+      <li><a href="#subsample-encryption"><span class="secno">4.1</span> <span class="content">General Subsample Encryption constraints</span></a>
+      <li><a href="#subsample-encryption-illustration"><span class="secno">4.2</span> <span class="content">Subsample Encryption Illustration</span></a>
+     </ol>
+    <li><a href="#codecsparam"><span class="secno">5</span> <span class="content">Codecs Parameter String</span></a>
+    <li><a href="#changelist"><span class="secno">6</span> <span class="content">Changes since v1.1.0 release</span></a>
+    <li><a href="#conformance"><span class="secno"></span> <span class="content"> Conformance</span></a>
+    <li>
+     <a href="#index"><span class="secno"></span> <span class="content">Index</span></a>
      <ol class="toc">
-      <li><a href="https://aomediacodec.github.io/av1-isobmff/#index-defined-here"><span class="secno"></span> <span class="content">Terms defined by this specification</span></a>
-      </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#index-defined-elsewhere"><span class="secno"></span> <span class="content">Terms defined by reference</span></a>
-     </li></ol>
-    </li><li>
-     <a href="https://aomediacodec.github.io/av1-isobmff/#references"><span class="secno"></span> <span class="content">References</span></a>
+      <li><a href="#index-defined-here"><span class="secno"></span> <span class="content">Terms defined by this specification</span></a>
+      <li><a href="#index-defined-elsewhere"><span class="secno"></span> <span class="content">Terms defined by reference</span></a>
+     </ol>
+    <li>
+     <a href="#references"><span class="secno"></span> <span class="content">References</span></a>
      <ol class="toc">
-      <li><a href="https://aomediacodec.github.io/av1-isobmff/#normative"><span class="secno"></span> <span class="content">Normative References</span></a>
-     </li></ol>
-   </li></ol>
+      <li><a href="#normative"><span class="secno"></span> <span class="content">Normative References</span></a>
+     </ol>
+   </ol>
   </nav>
   <main>
-   <h2 class="heading settled" data-level="1" id="bitstream-overview"><span class="secno">1. </span><span class="content">Bitstream features overview</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#bitstream-overview"></a></h2>
+   <h2 class="heading settled" data-level="1" id="bitstream-overview"><span class="secno">1. </span><span class="content">Bitstream features overview</span><a class="self-link" href="#bitstream-overview"></a></h2>
     An <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1" id="ref-for-page=1">AV1 bitstream</a> is composed of a sequence of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39">OBUs</a>, grouped into <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13">Temporal Units</a>. 
    <p>OBUs are made of a 1 or 2 bytes header, identifying in particular the type of OBU, followed by an optional length field and by an optional payload, whose presence and content depend on the OBU type. Depending on its type, an OBU can carry configuration information, metadata, or coded video data.</p>
-   <p class="note" role="note"><span>NOTE:</span> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121">Tile List OBUs</a> defined in the <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a> specification are not supported in the current version of this specification. A future version of the specification may do so.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121">Tile List OBUs</a> defined in the <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a> specification are not supported in the current version of this specification. A future version of the specification may do so.</p>
    <p>Temporal Units are processed by a decoder in the order given by the bitstream. Each Temporal Unit is associated with a presentation time. Some Temporal Units may contain multiple frames to be decoded but only one is presented.</p>
-   <p class="note" role="note"><span>NOTE:</span> The AV1 specification defines scalability features, allowing frames from multiple layers or operating points to be present in a single temporal unit. This version of storage in ISOBMFF supports the simple storage of scalable streams in a single track, but does not specify advanced tools for handling multi-track support, layer extraction, or other scalability related use cases. A future version of the specification may do so.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> The AV1 specification defines scalability features, allowing frames from multiple layers or operating points to be present in a single temporal unit. This version of storage in ISOBMFF supports the simple storage of scalable streams in a single track, but does not specify advanced tools for handling multi-track support, layer extraction, or other scalability related use cases. A future version of the specification may do so.</p>
    <p>Frames carried in Temporal Units may have coding dependencies on frames carried previously in the same Temporal Unit or in previous Temporal Units. Frames that can be decoded without dependencies to previous frames are of two categories: <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13①">Key Frames</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13②">Intra-only Frames</a>. Frames that cannot be decoded independently are of three categories: <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13③">Inter Frames</a>, <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13④">Switch Frames</a>, and frames with a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2">show_existing_frame</a> flag set to 1.</p>
-   <p>Key Frames with the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①">show_frame</a> flag set to 1 have the additional property that after decoding the Key Frame, all frames following the Key Frame in the bitstream can be decoded. They are called <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206">Random Access Points</a> in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a>.</p>
+   <p>Key Frames with the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①">show_frame</a> flag set to 1 have the additional property that after decoding the Key Frame, all frames following the Key Frame in the bitstream can be decoded. They are called <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206">Random Access Points</a> in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a>.</p>
    <p>Key Frames with the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②">show_frame</a> flag set to 0 are called <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206①">Delayed Random Access Points</a>. <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206②">Delayed Random Access Points</a> have the additional property that if a future <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206③">Key Frame Dependent Recovery Point</a> exists, all frames following that <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206④">Key Frame Dependent Recovery Point</a> can be decoded. A <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑤">Key Frame Dependent Recovery Point</a> is a frame with <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2③">show_existing_frame</a> set to 1 that refers to a previous <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑥">Delayed Random Access Points</a>.</p>
-   <h2 class="heading settled" data-level="2" id="basic-encapsulation"><span class="secno">2. </span><span class="content">Basic Encapsulation Scheme</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#basic-encapsulation"></a></h2>
-   <p>This section describes the basic data structures used to signal encapsulation of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1" id="ref-for-page=1①">AV1 bitstreams</a> in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-isobmff">[ISOBMFF]</a> containers.</p>
-   <h3 class="heading settled" data-level="2.1" id="brands"><span class="secno">2.1. </span><span class="content">General Requirements &amp; Brands</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#brands"></a></h3>
+   <h2 class="heading settled" data-level="2" id="basic-encapsulation"><span class="secno">2. </span><span class="content">Basic Encapsulation Scheme</span><a class="self-link" href="#basic-encapsulation"></a></h2>
+   <p>This section describes the basic data structures used to signal encapsulation of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1" id="ref-for-page=1①">AV1 bitstreams</a> in <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a> containers.</p>
+   <h3 class="heading settled" data-level="2.1" id="brands"><span class="secno">2.1. </span><span class="content">General Requirements &amp; Brands</span><a class="self-link" href="#brands"></a></h3>
    <p>A file conformant to this specification satisfies the following:</p>
    <ul>
-    <li data-md="">
-     <p>It SHALL conform to the normative requirements of <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-isobmff">[ISOBMFF]</a></p>
-    </li><li data-md="">
-     <p>It SHALL have the <dfn class="css" data-dfn-for="ISOBMFF Brand" data-dfn-type="value" data-export="" id="valdef-isobmff-brand-av01">av01<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#valdef-isobmff-brand-av01"></a></dfn> brand among the compatible brands array of the FileTypeBox</p>
-    </li><li data-md="">
-     <p>It SHALL contain at least one track using an <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry" id="ref-for-av1sampleentry">AV1SampleEntry</a></p>
-    </li><li data-md="">
-     <p>It SHOULD indicate a structural ISOBMFF brand among the compatible brands array of the FileTypeBox, such as <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-">iso6</a></p>
-    </li><li data-md="">
-     <p>It MAY indicate CMAF brands as specified in <a href="https://aomediacodec.github.io/av1-isobmff/#cmaf">§ 3 CMAF AV1 track format</a></p>
-    </li><li data-md="">
-     <p>It MAY indicate other brands not specified in this document provided that the associated requirements do not conflict with those given in this specification</p>
-   </li></ul>
-   <p>Parsers SHALL support the structures required by the <code><a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①">iso6</a></code> brand and MAY support structures required by further ISOBMFF structural brands.</p>
-   <h3 class="heading settled" data-level="2.2" id="av1sampleentry-section"><span class="secno">2.2. </span><span class="content">AV1 Sample Entry</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-section"></a></h3>
-   <h4 class="heading settled" data-level="2.2.1" id="av1sampleentry-definition"><span class="secno">2.2.1. </span><span class="content">Definition</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-definition"></a></h4>
-<pre class="def">Sample Entry Type: <dfn data-dfn-for="AV1SampleEntry" data-dfn-type="value" data-export="" id="valdef-av1sampleentry-av01">av01<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#valdef-av1sampleentry-av01"></a></dfn>
+    <li data-md><span id="assert-3d78af2f">It SHALL conform to the normative requirements of <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a></span> 
+    <li data-md><span id="assert-03258f22">It SHALL have the <dfn class="css" data-dfn-for="ISOBMFF Brand" data-dfn-type="value" data-export id="valdef-isobmff-brand-av01">av01<a class="self-link" href="#valdef-isobmff-brand-av01"></a></dfn> brand among the compatible brands array of the FileTypeBox</span> 
+    <li data-md><span id="assert-0f24a9ee">It SHALL contain at least one track using an <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry">AV1SampleEntry</a></span> 
+    <li data-md><span id="assert-5e63f779">It SHOULD indicate a structural ISOBMFF brand among the compatible brands array of the FileTypeBox, such as <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something">iso6</a></span> 
+    <li data-md><span id="assert-c652c075">It MAY indicate CMAF brands as specified in <a href="#cmaf">§ 3 CMAF AV1 track format</a></span> 
+    <li data-md><span id="assert-384c2374">It MAY indicate other brands not specified in this document provided that the associated requirements do not conflict with those given in this specification</span> 
+   </ul>
+   <p>Parsers SHALL support the structures required by the <code><a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①">iso6</a></code> brand and MAY support structures required by further ISOBMFF structural brands.</p>
+   <h3 class="heading settled" data-level="2.2" id="av1sampleentry-section"><span class="secno">2.2. </span><span class="content">AV1 Sample Entry</span><a class="self-link" href="#av1sampleentry-section"></a></h3>
+   <h4 class="heading settled" data-level="2.2.1" id="av1sampleentry-definition"><span class="secno">2.2.1. </span><span class="content">Definition</span><a class="self-link" href="#av1sampleentry-definition"></a></h4>
+<pre class="def">Sample Entry Type: <dfn data-dfn-for="AV1SampleEntry" data-dfn-type="value" data-export id="valdef-av1sampleentry-av01">av01<a class="self-link" href="#valdef-av1sampleentry-av01"></a></dfn>
 Container:         Sample Description Box ('stsd')
-Mandatory:         Yes
-Quantity:          One or more.
+Mandatory:         <span id="assert-93cba074">Yes</span>
+Quantity:          <span id="assert-17ecb535">One or more.</span>
 </pre>
-   <h4 class="heading settled" data-level="2.2.2" id="av1sampleentry-description"><span class="secno">2.2.2. </span><span class="content">Description</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-description"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1sampleentry">AV1SampleEntry</dfn> sample entry identifies that the track contains <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1-sample" id="ref-for-av1-sample">AV1 Samples</a>, and uses an <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox">AV1CodecConfigurationBox</a>.</p>
-   <h4 class="heading settled" data-level="2.2.3" id="av1sampleentry-syntax"><span class="secno">2.2.3. </span><span class="content">Syntax</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-syntax"></a></h4>
+   <h4 class="heading settled" data-level="2.2.2" id="av1sampleentry-description"><span class="secno">2.2.2. </span><span class="content">Description</span><a class="self-link" href="#av1sampleentry-description"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1sampleentry">AV1SampleEntry</dfn> sample entry identifies that the track contains <a data-link-type="dfn" href="#av1-sample" id="ref-for-av1-sample">AV1 Samples</a>, and uses an <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox">AV1CodecConfigurationBox</a>.</p>
+   <h4 class="heading settled" data-level="2.2.3" id="av1sampleentry-syntax"><span class="secno">2.2.3. </span><span class="content">Syntax</span><a class="self-link" href="#av1sampleentry-syntax"></a></h4>
 <pre>class AV1SampleEntry extends VisualSampleEntry('av01') {
   AV1CodecConfigurationBox config;
 }
 </pre>
-   <h4 class="heading settled" data-level="2.2.4" id="av1sampleentry-semantics"><span class="secno">2.2.4. </span><span class="content">Semantics</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-semantics"></a></h4>
-   <p>The <dfn data-dfn-type="dfn" data-noexport="" id="width">width<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#width"></a></dfn> and <dfn data-dfn-type="dfn" data-noexport="" id="height">height<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#height"></a></dfn> fields of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="termref-for-②">VisualSampleEntry</a> SHALL equal the values of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2④">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑤">max_frame_height_minus_1</a> + 1 of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41">Sequence Header OBU</a> applying to the samples associated with this sample entry.</p>
-   <p>The width and height in the TrackHeaderBox SHOULD equal, respectively, the maximum RenderWidth, called MaxRenderWidth, and the maximum RenderHeight, called MaxRenderHeight, of all the frames associated with this sample entry. Additionally, if MaxRenderWidth and MaxRenderHeight values do not equal respectively the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑥">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑦">max_frame_height_minus_1</a> + 1 values of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①">Sequence Header OBU</a>, a PixelAspectRatioBox box SHALL be present in the sample entry and set such that</p>
+   <h4 class="heading settled" data-level="2.2.4" id="av1sampleentry-semantics"><span class="secno">2.2.4. </span><span class="content">Semantics</span><a class="self-link" href="#av1sampleentry-semantics"></a></h4>
+    <span id="assert-4708372f">The <dfn data-dfn-type="dfn" data-noexport id="width">width<a class="self-link" href="#width"></a></dfn> and <dfn data-dfn-type="dfn" data-noexport id="height">height<a class="self-link" href="#height"></a></dfn> fields of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something②">VisualSampleEntry</a> SHALL equal the values of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2④">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑤">max_frame_height_minus_1</a> + 1 of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41">Sequence Header OBU</a> applying to the samples associated with this sample entry.</span> <span id="assert-1624cff2">The width and height in the TrackHeaderBox SHOULD equal, respectively, the maximum RenderWidth, called MaxRenderWidth, and the maximum RenderHeight, called MaxRenderHeight, of all the frames associated with this sample entry.</span> <span id="assert-54ae6192">Additionally, if MaxRenderWidth and MaxRenderHeight values do not equal respectively the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑥">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑦">max_frame_height_minus_1</a> + 1 values of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①">Sequence Header OBU</a>, a PixelAspectRatioBox box SHALL be present in the sample entry and set such that</span> 
 <pre>hSpacing / vSpacing = MaxRenderWidth * (max_frame_height_minus_1 + 1) /
                               ((max_frame_width_minus_1 + 1) * MaxRenderHeight)
 </pre>
-   <p>The <dfn data-dfn-type="dfn" data-noexport="" id="compressorname">compressorname<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#compressorname"></a></dfn> field of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="termref-for-③">VisualSampleEntry</a> is an informative name. It is formatted in a fixed 32-byte field, with the first byte set to the number of bytes to be displayed, followed by that number of bytes of displayable data, followed by padding to complete 32 bytes total (including the size byte). The value "\012AOM Coding" is RECOMMENDED; the first byte is a count of the remaining bytes, here represented by \012, which (being octal 12) is decimal 10, the number of bytes in the rest of the string.</p>
-   <p class="note" role="note"><span>NOTE:</span> Parsers may ignore the value of the compressorname field. It is specified in this document simply for legacy and backwards compatibility reasons.</p>
-   <p>The <dfn data-dfn-type="dfn" data-noexport="" id="config">config<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#config"></a></dfn> field SHALL contain an <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox①">AV1CodecConfigurationBox</a> that applies to the samples associated with this sample entry.</p>
-   <p class="note" role="note"><span>NOTE:</span> Multiple instances of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry" id="ref-for-av1sampleentry①">AV1SampleEntry</a> may be required when the track contains samples requiring a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox②">AV1CodecConfigurationBox</a> with different characteristics.</p>
-   <p>Optional boxes not specifically mentioned here can be present, in particular those indicated in the definition of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="termref-for-④">VisualSampleEntry</a> in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-isobmff">[ISOBMFF]</a>.</p>
-   <h3 class="heading settled" data-level="2.3" id="av1codecconfigurationbox-section"><span class="secno">2.3. </span><span class="content">AV1 Codec Configuration Box</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-section"></a></h3>
-   <h4 class="heading settled" data-level="2.3.1" id="av1codecconfigurationbox-definition"><span class="secno">2.3.1. </span><span class="content">Definition</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-definition"></a></h4>
-<pre class="def">Box Type:  <dfn data-dfn-type="dfn" data-export="" id="av1c">av1C<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1c"></a></dfn>
+   <p>The <dfn data-dfn-type="dfn" data-noexport id="compressorname">compressorname<a class="self-link" href="#compressorname"></a></dfn> field of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something③">VisualSampleEntry</a> is an informative name. It is formatted in a fixed 32-byte field, with the first byte set to the number of bytes to be displayed, followed by that number of bytes of displayable data, followed by padding to complete 32 bytes total (including the size byte). <span id="assert-da9cc152">The value "\012AOM Coding" is RECOMMENDED</span>; the first byte is a count of the remaining bytes, here represented by \012, which (being octal 12) is decimal 10, the number of bytes in the rest of the string.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> Parsers may ignore the value of the compressorname field. It is specified in this document simply for legacy and backwards compatibility reasons.</p>
+    <span id="assert-8d3f8e0c">The <dfn data-dfn-type="dfn" data-noexport id="config">config<a class="self-link" href="#config"></a></dfn> field SHALL contain an <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox①">AV1CodecConfigurationBox</a> that applies to the samples associated with this sample entry.</span> 
+   <p class="note" role="note"><span class="marker">NOTE:</span> <span id="assert-8d7a614c">Multiple instances of <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry①">AV1SampleEntry</a> may be required when the track contains samples requiring a <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox②">AV1CodecConfigurationBox</a> with different characteristics.</span></p>
+    <span id="assert-d9e74d75">Optional boxes not specifically mentioned here can be present, in particular those indicated in the definition of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something④">VisualSampleEntry</a> in <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a>.</span> 
+   <h3 class="heading settled" data-level="2.3" id="av1codecconfigurationbox-section"><span class="secno">2.3. </span><span class="content">AV1 Codec Configuration Box</span><a class="self-link" href="#av1codecconfigurationbox-section"></a></h3>
+   <h4 class="heading settled" data-level="2.3.1" id="av1codecconfigurationbox-definition"><span class="secno">2.3.1. </span><span class="content">Definition</span><a class="self-link" href="#av1codecconfigurationbox-definition"></a></h4>
+<pre class="def">Box Type:  <dfn data-dfn-type="dfn" data-export id="av1c">av1C<a class="self-link" href="#av1c"></a></dfn>
 Container: AV1 Sample Entry ('av01')
-Mandatory: Yes
-Quantity:  Exactly One
+Mandatory: <span id="assert-93cba074">Yes</span>
+Quantity:  <span id="assert-29c02c41">Exactly One</span>
 </pre>
-   <h4 class="heading settled" data-level="2.3.2" id="av1codecconfigurationbox-description"><span class="secno">2.3.2. </span><span class="content">Description</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-description"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1codecconfigurationbox">AV1CodecConfigurationBox</dfn> contains decoder configuration information that SHALL be valid for every sample that references the sample entry.</p>
-   <h4 class="heading settled" data-level="2.3.3" id="av1codecconfigurationbox-syntax"><span class="secno">2.3.3. </span><span class="content">Syntax</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-syntax"></a></h4>
+   <h4 class="heading settled" data-level="2.3.2" id="av1codecconfigurationbox-description"><span class="secno">2.3.2. </span><span class="content">Description</span><a class="self-link" href="#av1codecconfigurationbox-description"></a></h4>
+    <span id="assert-f875c695">The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1codecconfigurationbox">AV1CodecConfigurationBox</dfn> contains decoder configuration information that SHALL be valid for every sample that references the sample entry.</span> 
+   <h4 class="heading settled" data-level="2.3.3" id="av1codecconfigurationbox-syntax"><span class="secno">2.3.3. </span><span class="content">Syntax</span><a class="self-link" href="#av1codecconfigurationbox-syntax"></a></h4>
 <pre>class AV1CodecConfigurationBox extends Box('av1C'){
   AV1CodecConfigurationRecord av1Config;
 }
@@ -2135,150 +2191,136 @@ <h4 class="heading settled" data-level="2.3.3" id="av1codecconfigurationbox-synt
   unsigned int (8)[] configOBUs;
 }
 </pre>
-   <h4 class="heading settled" data-level="2.3.4" id="av1codecconfigurationbox-semantics"><span class="secno">2.3.4. </span><span class="content">Semantics</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-semantics"></a></h4>
-   <p>The <dfn data-dfn-type="dfn" data-export="" id="marker">marker<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#marker"></a></dfn> field SHALL be set to 1.</p>
-   <p class="note" role="note"><span>NOTE:</span> The marker bit ensures that the bit pattern of the first byte of the AV1CodecConfigurationRecord cannot be mistaken for an <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40" id="ref-for-page=40">OBU Header</a> byte.</p>
-   <p>The <dfn data-dfn-type="dfn" data-noexport="" id="version">version<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#version"></a></dfn> field indicates the version of the AV1CodecConfigurationRecord. The value SHALL be set to 1 for AV1CodecConfigurationRecord.</p>
-   <p>The <dfn data-dfn-type="dfn" data-export="" id="seq_profile">seq_profile<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#seq_profile"></a></dfn> field indicates the AV1 profile and SHALL be equal to the seq_profile value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②">Sequence Header OBU</a>.</p>
-   <p>The <dfn data-dfn-type="dfn" data-export="" id="seq_level_idx_0">seq_level_idx_0<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#seq_level_idx_0"></a></dfn> field indicates the value of seq_level_idx[0] found in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③">Sequence Header OBU</a> and SHALL be equal to the value of seq_level_idx[0] in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41④">Sequence Header OBU</a>.</p>
-   <p>The <dfn data-dfn-type="dfn" data-export="" id="seq_tier_0">seq_tier_0<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#seq_tier_0"></a></dfn> field indicates the value of seq_tier[0] found in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑤">Sequence Header OBU</a> and SHALL be equal to the value of seq_tier[0] in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑥">Sequence Header OBU</a>.</p>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export="" id="high_bitdepth">high_bitdepth</dfn> field indicates the value of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#high_bitdepth" id="ref-for-high_bitdepth">high_bitdepth</a> flag from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑦">Sequence Header OBU</a>.</p>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export="" id="twelve_bit">twelve_bit</dfn> field indicates the value of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#twelve_bit" id="ref-for-twelve_bit">twelve_bit</a> flag from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑧">Sequence Header OBU</a>. When twelve_bit is not present in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑨">Sequence Header OBU</a> the AV1CodecConfigurationRecord twelve_bit value SHALL be 0.</p>
-   <p>The <dfn data-dfn-type="dfn" data-export="" id="monochrome">monochrome<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#monochrome"></a></dfn> field indicates the value of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑧">mono_chrome</a> flag from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⓪">Sequence Header OBU</a>.</p>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export="" id="chroma_subsampling_x">chroma_subsampling_x</dfn> field indicates the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑨">subsampling_x</a> value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①①">Sequence Header OBU</a>.</p>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export="" id="chroma_subsampling_y">chroma_subsampling_y</dfn> field indicates the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⓪">subsampling_y</a> value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①②">Sequence Header OBU</a>.</p>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export="" id="chroma_sample_position">chroma_sample_position</dfn> field indicates the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#chroma_sample_position" id="ref-for-chroma_sample_position">chroma_sample_position</a> value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①③">Sequence Header OBU</a>.</p>
-   <p>When not specified in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①④">Sequence Header OBU</a>, and not defined by the conditions specified in the <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44" id="ref-for-page=44">color_config</a>, the values of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#chroma_subsampling_x" id="ref-for-chroma_subsampling_x">chroma_subsampling_x</a>, <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#chroma_subsampling_y" id="ref-for-chroma_subsampling_y">chroma_subsampling_y</a>, and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#chroma_sample_position" id="ref-for-chroma_sample_position①">chroma_sample_position</a> SHALL be 0.</p>
-   <p>The <dfn data-dfn-type="dfn" data-export="" id="initial_presentation_delay_present">initial_presentation_delay_present<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_present"></a></dfn> field indicates the presence of the initial_presentation_delay_minus_one field.</p>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="initial_presentation_delay_minus_one">initial_presentation_delay_minus_one</dfn> field indicates the number of samples (minus one) that need to be decoded prior to starting the presentation of the first sample associated with this sample entry in order to guarantee that each sample will be decoded prior to its presentation time under the constraints of the first level value indicated by <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①①">seq_level_idx</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑤">Sequence Header OBU</a> (in the configOBUs field or in the associated samples). More precisely, the following procedure SHALL not return any error:</p>
-   <ul>
-    <li data-md="">
+   <h4 class="heading settled" data-level="2.3.4" id="av1codecconfigurationbox-semantics"><span class="secno">2.3.4. </span><span class="content">Semantics</span><a class="self-link" href="#av1codecconfigurationbox-semantics"></a></h4>
+    <span id="assert-52768b11">The <dfn data-dfn-type="dfn" data-export id="marker">marker<a class="self-link" href="#marker"></a></dfn> field SHALL be set to 1.</span> 
+   <p class="note" role="note"><span class="marker">NOTE:</span> The marker bit ensures that the bit pattern of the first byte of the AV1CodecConfigurationRecord cannot be mistaken for an <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40" id="ref-for-page=40">OBU Header</a> byte.</p>
+   <p>The <dfn data-dfn-type="dfn" data-noexport id="version">version<a class="self-link" href="#version"></a></dfn> field indicates the version of the AV1CodecConfigurationRecord. <span id="assert-49a325d3">The value SHALL be set to 1 for AV1CodecConfigurationRecord</span>.</p>
+    <span id="assert-96a6c200">The <dfn data-dfn-type="dfn" data-export id="seq_profile">seq_profile<a class="self-link" href="#seq_profile"></a></dfn> field indicates the AV1 profile and SHALL be equal to the seq_profile value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②">Sequence Header OBU</a>.</span> <span id="assert-7d134bb5">The <dfn data-dfn-type="dfn" data-export id="seq_level_idx_0">seq_level_idx_0<a class="self-link" href="#seq_level_idx_0"></a></dfn> field indicates the value of seq_level_idx[0] found in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③">Sequence Header OBU</a> and SHALL be equal to the value of seq_level_idx[0] in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41④">Sequence Header OBU</a></span>. <span id="assert-3fe26d43">The <dfn data-dfn-type="dfn" data-export id="seq_tier_0">seq_tier_0<a class="self-link" href="#seq_tier_0"></a></dfn> field indicates the value of seq_tier[0] found in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑤">Sequence Header OBU</a> and SHALL be equal to the value of seq_tier[0] in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑥">Sequence Header OBU</a></span>. 
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="high_bitdepth">high_bitdepth</dfn> field indicates the value of the <a data-link-type="dfn" href="#high_bitdepth" id="ref-for-high_bitdepth">high_bitdepth</a> flag from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑦">Sequence Header OBU</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="twelve_bit">twelve_bit</dfn> field indicates the value of the <a data-link-type="dfn" href="#twelve_bit" id="ref-for-twelve_bit">twelve_bit</a> flag from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑧">Sequence Header OBU</a>. <span id="assert-71c21ca1">When twelve_bit is not present in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑨">Sequence Header OBU</a> the AV1CodecConfigurationRecord twelve_bit value SHALL be 0.</span></p>
+   <p>The <dfn data-dfn-type="dfn" data-export id="monochrome">monochrome<a class="self-link" href="#monochrome"></a></dfn> field indicates the value of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑧">mono_chrome</a> flag from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⓪">Sequence Header OBU</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="chroma_subsampling_x">chroma_subsampling_x</dfn> field indicates the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑨">subsampling_x</a> value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①①">Sequence Header OBU</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="chroma_subsampling_y">chroma_subsampling_y</dfn> field indicates the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⓪">subsampling_y</a> value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①②">Sequence Header OBU</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="chroma_sample_position">chroma_sample_position</dfn> field indicates the <a data-link-type="dfn" href="#chroma_sample_position" id="ref-for-chroma_sample_position">chroma_sample_position</a> value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①③">Sequence Header OBU</a>.</p>
+    <span id="assert-9d2dbc84">When not specified in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①④">Sequence Header OBU</a>, and not defined by the conditions specified in the <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44" id="ref-for-page=44">color_config</a>, the values of <a data-link-type="dfn" href="#chroma_subsampling_x" id="ref-for-chroma_subsampling_x">chroma_subsampling_x</a>, <a data-link-type="dfn" href="#chroma_subsampling_y" id="ref-for-chroma_subsampling_y">chroma_subsampling_y</a>, and <a data-link-type="dfn" href="#chroma_sample_position" id="ref-for-chroma_sample_position①">chroma_sample_position</a> SHALL be 0.</span> 
+   <p>The <dfn data-dfn-type="dfn" data-export id="initial_presentation_delay_present">initial_presentation_delay_present<a class="self-link" href="#initial_presentation_delay_present"></a></dfn> field indicates the presence of the initial_presentation_delay_minus_one field.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="initial_presentation_delay_minus_one">initial_presentation_delay_minus_one</dfn> field indicates the number of samples (minus one) that need to be decoded prior to starting the presentation of the first sample associated with this sample entry in order to guarantee that each sample will be decoded prior to its presentation time under the constraints of the first level value indicated by <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①①">seq_level_idx</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑤">Sequence Header OBU</a> (in the configOBUs field or in the associated samples). More precisely, <span id="assert-00f2331b">the following procedure SHALL not return any error</span>:</p>
+   <ul>
+    <li data-md>
      <p>construct a hypothetical bitstream consisting of the OBUs carried in the sample entry followed by the OBUs carried in all the samples referring to that sample entry,</p>
-    </li><li data-md="">
-     <p>set the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①②">initial_display_delay_minus_1</a> field of each <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑥">Sequence Header OBU</a> to the number of frames minus one contained in the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one">initial_presentation_delay_minus_one</a> + 1 samples,</p>
-    </li><li data-md="">
+    <li data-md>
+     <p>set the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①②">initial_display_delay_minus_1</a> field of each <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑥">Sequence Header OBU</a> to the number of frames minus one contained in the first <a data-link-type="dfn" href="#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one">initial_presentation_delay_minus_one</a> + 1 samples,</p>
+    <li data-md>
      <p>set the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①③">frame_presentation_time</a> field of the frame header of each presentable frame such that it matches the presentation time difference between the sample carrying this frame and the previous sample (if it exists, 0 otherwise),</p>
-    </li><li data-md="">
-     <p>apply the decoder model specified in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a> to this hypothetical bitstream using the first operating point. If <code>buffer_removal_time</code> information is present in bitstream for this operating point, the decoding schedule mode SHALL be applied, otherwise the resource availability mode SHALL be applied.</p>
-   </li></ul>
-   <p class="note" role="note"><span>NOTE:</span> With the above procedure, when smooth presentation can be guaranteed after decoding the first sample, initial_presentation_delay_minus_one is 0.</p>
-   <p class="note" role="note"><span>NOTE:</span> Because the above procedure considers all OBUs in all samples associated with a sample entry, if these OBUS form multiple coded video sequences which would have different values of <code>initial_presentation_delay_minus_one</code> if considered separately, the sample entry would signal the larger value.</p>
+    <li data-md>
+     <p>apply the decoder model specified in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a> to this hypothetical bitstream using the first operating point. If <code>buffer_removal_time</code> information is present in bitstream for this operating point, the decoding schedule mode SHALL be applied, otherwise the resource availability mode SHALL be applied.</p>
+   </ul>
+   <p class="note" role="note"><span class="marker">NOTE:</span> With the above procedure, when smooth presentation can be guaranteed after decoding the first sample, initial_presentation_delay_minus_one is 0.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> Because the above procedure considers all OBUs in all samples associated with a sample entry, if these OBUS form multiple coded video sequences which would have different values of <code>initial_presentation_delay_minus_one</code> if considered separately, the sample entry would signal the larger value.</p>
    <div class="example" id="example-27bde372">
-    <a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#example-27bde372"></a> The difference between <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one①">initial_presentation_delay_minus_one</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①④">initial_display_delay_minus_1</a> can be illustrated by considering the following example: 
+    <a class="self-link" href="#example-27bde372"></a> The difference between <a data-link-type="dfn" href="#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one①">initial_presentation_delay_minus_one</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①④">initial_display_delay_minus_1</a> can be illustrated by considering the following example: 
 <pre>a b c d e f g h
 </pre>
     where letters correspond to frames. Assume that <code><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑤">initial_display_delay_minus_1</a></code> is 2, i.e. that once frame <code>c</code> has been decoded, all other frames in the bitstream can be presented on time. If those frames were grouped into temporal units and samples as follows: 
 <pre>[a] [b c d] [e] [f] [g] [h]
 </pre>
-    <code><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one②">initial_presentation_delay_minus_one</a></code> would be 1 because it takes presentation of 2 samples to ensure that <code>c</code> is decoded.
+    <code><a data-link-type="dfn" href="#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one②">initial_presentation_delay_minus_one</a></code> would be 1 because it takes presentation of 2 samples to ensure that <code>c</code> is decoded.
 But if the frames were grouped as follows: 
 <pre>[a] [b] [c] [d e f] [g] [h]
 </pre>
-    <code><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one③">initial_presentation_delay_minus_one</a></code> would be 2 because it takes presentation of 3 samples to ensure that <code>c</code> is decoded. 
+    <code><a data-link-type="dfn" href="#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one③">initial_presentation_delay_minus_one</a></code> would be 2 because it takes presentation of 3 samples to ensure that <code>c</code> is decoded. 
    </div>
-   <p>The <dfn data-dfn-type="dfn" data-export="" id="configobus">configOBUs<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#configobus"></a></dfn> field contains zero or more OBUs. Any OBU may be present provided that the following procedures produce compliant AV1 bitstreams:</p>
-   <ul>
-    <li data-md="">
-     <p>From any sync sample, an AV1 bitstream is formed by first outputting the OBUs contained in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox③">AV1CodecConfigurationBox</a> and then by outputing all OBUs in the samples themselves, in order, starting from the sync sample.</p>
-    </li><li data-md="">
-     <p>From any sample marked with the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1forwardkeyframesamplegroupentry" id="ref-for-av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</a>, an AV1 bitstream is formed by first outputting the OBUs contained in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox④">AV1CodecConfigurationBox</a> and then by outputing all OBUs in the sample itself, then by outputting all OBUs in the samples, in order, starting from the sample at the distance indicated by the sample group.</p>
-   </li></ul>
-   <p>Additionally, the configOBUs field SHALL contain at most one <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑦">Sequence Header OBU</a> and if present, it SHALL be the first OBU.</p>
-   <p class="note" role="note"><span>NOTE:</span> The configOBUs field is expected to contain only one <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑧">Sequence Header OBU</a> and zero or more <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46">Metadata OBUs</a> when applicable to all the associated samples.</p>
-   <p>OBUs stored in the configOBUs field follow the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑥">open_bitstream_unit</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39①">Low Overhead Bitstream Format</a> syntax as specified in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a>. The flag <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑦">obu_has_size_field</a> SHALL be set to 1, indicating that the size of the OBU payload follows the header, and that it is coded using LEB128.</p>
-   <p>When a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑨">Sequence Header OBU</a> is contained within the configOBUs of the AV1CodecConfigurationRecord, the values present in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⓪">Sequence Header OBU</a> contained within configOBUs SHALL match the values of the AV1CodecConfigurationRecord.</p>
-   <p>The presentation times of AV1 samples are given by the ISOBMFF structures. The <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑧">timing_info_present_flag</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②①">Sequence Header OBU</a> (in the configOBUs field or in the associated samples) SHOULD be set to 0. If set to 1, the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45" id="ref-for-page=45">timing_info</a> structure of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②②">Sequence Header OBU</a>, the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑨">frame_presentation_time</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⓪">buffer_removal_time</a> fields of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49">Frame Header OBUs</a>, if present, SHALL be ignored for the purpose of timed processing of the ISOBMFF file.</p>
-   <p>The sample entry SHOULD contain a <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-⑤">colr</a> box with a colour_type set to <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-⑥">nclx</a>. If present, the values of colour_primaries, transfer_characteristics, and matrix_coefficients SHALL match the values given in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②③">Sequence Header OBU</a> (in the configOBUs field or in the associated samples) if the color_description_present_flag is set to 1. Similarly, the full_range_flag in the <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-⑦">colr</a> box shall match the color_range flag in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②④">Sequence Header OBU</a>. When configOBUs does not contain a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑤">Sequence Header OBU</a>, this box with colour_type set to <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-⑧">nclx</a> SHALL be present.</p>
-   <p>The CleanApertureBox <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-⑨">clap</a> SHOULD not be present.</p>
-   <p>For sample entries corresponding to HDR content, the MasteringDisplayColourVolumeBox <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①⓪">mdcv</a> and ContentLightLevelBox <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①①">clli</a> SHOULD be present, and their values SHALL match the values of contained in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46①">Metadata OBUs</a> of type METADATA_TYPE_HDR_CLL and METADATA_TYPE_HDR_MDCV, if present (in the configOBUs or in the samples).</p>
-   <p class="note" role="note"><span>NOTE:</span> The MasteringDisplayColourVolumeBox <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①②">mdcv</a> and ContentLightLevelBox <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①③">clli</a> have identical syntax to the SMPTE2086MasteringDisplayMetadataBox <a class="property" data-link-type="propdesc" href="https://www.webmproject.org/vp9/mp4/#" id="termref-for-①④">SmDm</a> and ContentLightLevelBox <a class="property" data-link-type="propdesc" href="https://www.webmproject.org/vp9/mp4/#" id="termref-for-①⑤">CoLL</a>, except that they are of type <code>Box</code> and not <code>FullBox</code>. However, the semantics of the MasteringDisplayColourVolumeBox and SMPTE2086MasteringDisplayMetadataBox have important differences and should not be confused.</p>
-   <p>Additional boxes may be provided at the end of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="termref-for-①⑥">VisualSampleEntry</a> as permitted by ISOBMFF, that may represent redundant or similar information to the one provided in some OBUs contained in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox⑤">AV1CodecConfigurationBox</a>. If the box definition does not indicate that its information overrides the OBU information, in case of conflict, the OBU information should be considered authoritative.</p>
-   <h3 class="heading settled" data-level="2.4" id="sampleformat"><span class="secno">2.4. </span><span class="content">AV1 Sample Format</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#sampleformat"></a></h3>
-   <p>For tracks using the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry" id="ref-for-av1sampleentry②">AV1SampleEntry</a>, an <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1-sample">AV1 Sample</dfn> has the following constraints:</p>
-   <ul>
-    <li data-md="">
-     <p>the sample data SHALL be a sequence of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39②">OBUs</a> forming a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑤">Temporal Unit</a>,</p>
-    </li><li data-md="">
-     <p>each OBU SHALL follow the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②①">open_bitstream_unit</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39③">Low Overhead Bitstream Format</a> syntax as specified in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a>. Each OBU SHALL have the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②②">obu_has_size_field</a> set to 1 except for the last OBU in the sample, for which <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②③">obu_has_size_field</a> MAY be set to 0, in which case it is assumed to fill the remainder of the sample,</p>
-   </li></ul>
-   <p class="note" role="note"><span>NOTE:</span> When extracting OBUs from an ISOBMFF file, and depending on the capabilities of the decoder processing these OBUs, ISOBMFF parsers MAY need to either: set the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②④">obu_has_size_field</a> to 1 for some OBUs if not already set, add the size field in this case, and add <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46②">Temporal Delimiter OBU</a>; or use the length-delimited bitstream format as defined in Annex B of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1s" id="ref-for-av1s">AV1</a>. If encryption is used, similar operations MAY have to be done before or after decryption depending on the demuxer/decryptor/decoder architecture.</p>
-   <ul>
-    <li data-md="">
-     <p>OBU trailing bits SHOULD be limited to byte alignment and SHOULD not be used for padding,</p>
-    </li><li data-md="">
-     <p>OBUs of type OBU_TEMPORAL_DELIMITER, OBU_PADDING, or OBU_REDUNDANT_FRAME_HEADER SHOULD NOT be used.</p>
-    </li><li data-md="">
-     <p>OBUs of type OBU_TILE_LIST SHALL NOT be used.</p>
-   </li></ul>
-   <p>If an AV1 Sample is signaled as a sync sample (in the SyncSampleBox or by setting sample_is_non_sync_sample to 0), it SHALL be a Random Access Point as defined in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a>, i.e. satisfy the following constraints:</p>
-   <ul>
-    <li data-md="">
+    <span id="assert-8890b1aa">The <dfn data-dfn-type="dfn" data-export id="configobus">configOBUs<a class="self-link" href="#configobus"></a></dfn> field contains zero or more OBUs</span>. Any OBU may be present provided that the following procedures produce compliant AV1 bitstreams: 
+   <ul>
+    <li data-md><span id="assert-d046552a">From any sync sample, an AV1 bitstream is formed by first outputting the OBUs contained in the <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox③">AV1CodecConfigurationBox</a> and then by outputing all OBUs in the samples themselves, in order, starting from the sync sample.</span> 
+    <li data-md><span id="assert-bb553a27">From any sample marked with the <a data-link-type="dfn" href="#av1forwardkeyframesamplegroupentry" id="ref-for-av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</a>, an AV1 bitstream is formed by first outputting the OBUs contained in the <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox④">AV1CodecConfigurationBox</a> and then by outputing all OBUs in the sample itself, then by outputting all OBUs in the samples, in order, starting from the sample at the distance indicated by the sample group.</span> 
+   </ul>
+   <p>Additionally, <span id="assert-755c9133">the configOBUs field SHALL contain at most one <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑦">Sequence Header OBU</a></span> and if present, <span id="assert-b90b2cfc">it SHALL be the first OBU</span>.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> The configOBUs field is expected to contain only one <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑧">Sequence Header OBU</a> and zero or more <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46">Metadata OBUs</a> when applicable to all the associated samples.</p>
+   <p>OBUs stored in the configOBUs field follow the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑥">open_bitstream_unit</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39①">Low Overhead Bitstream Format</a> syntax as specified in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a>. <span id="assert-cf9ef74c">The flag <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑦">obu_has_size_field</a> SHALL be set to 1, indicating that the size of the OBU payload follows the header, and that it is coded using LEB128</span>.</p>
+    <span id="assert-745b4db3">When a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑨">Sequence Header OBU</a> is contained within the configOBUs of the AV1CodecConfigurationRecord, the values present in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⓪">Sequence Header OBU</a> contained within configOBUs SHALL match the values of the AV1CodecConfigurationRecord.</span> 
+   <p>The presentation times of AV1 samples are given by the ISOBMFF structures. <span id="assert-551498bd">The <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑧">timing_info_present_flag</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②①">Sequence Header OBU</a> (in the configOBUs field or in the associated samples) SHOULD be set to 0</span>. <span id="assert-9be6e647">If set to 1, the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45" id="ref-for-page=45">timing_info</a> structure of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②②">Sequence Header OBU</a>, the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑨">frame_presentation_time</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⓪">buffer_removal_time</a> fields of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49">Frame Header OBUs</a>, if present, SHALL be ignored for the purpose of timed processing of the ISOBMFF file.</span></p>
+    <span id="assert-6056f4f8">The sample entry SHOULD contain a <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑤">colr</a> box with a colour_type set to <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑥">nclx</a></span>. <span id="assert-77d36bce">If present, the values of colour_primaries, transfer_characteristics, and matrix_coefficients SHALL match the values given in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②③">Sequence Header OBU</a> (in the configOBUs field or in the associated samples) if the color_description_present_flag is set to 1</span>. Similarly, <span id="assert-38597d4f">the full_range_flag in the <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑦">colr</a> box shall match the color_range flag in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②④">Sequence Header OBU</a>. When configOBUs does not contain a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑤">Sequence Header OBU</a>, this box with colour_type set to <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑧">nclx</a> SHALL be present.</span> <span id="assert-7eb8e932">The CleanApertureBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑨">clap</a> SHOULD not be present.</span> 
+   <p>For sample entries corresponding to HDR content, <span id="assert-bd7bad9a">the MasteringDisplayColourVolumeBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①⓪">mdcv</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①①">clli</a> SHOULD be present</span>, and <span id="assert-dbf01b08">their values SHALL match the values of contained in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46①">Metadata OBUs</a> of type METADATA_TYPE_HDR_CLL and METADATA_TYPE_HDR_MDCV, if present (in the configOBUs or in the samples).</span></p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> The MasteringDisplayColourVolumeBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①②">mdcv</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①③">clli</a> have identical syntax to the SMPTE2086MasteringDisplayMetadataBox <a class="property css" data-link-type="property" href="https://www.webmproject.org/vp9/mp4/#" id="ref-for-something①④">SmDm</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.webmproject.org/vp9/mp4/#" id="ref-for-something①⑤">CoLL</a>, except that they are of type <code>Box</code> and not <code>FullBox</code>. However, the semantics of the MasteringDisplayColourVolumeBox and SMPTE2086MasteringDisplayMetadataBox have important differences and should not be confused.</p>
+    <span id="assert-fa8b4082">Additional boxes may be provided at the end of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①⑥">VisualSampleEntry</a> as permitted by ISOBMFF, that may represent redundant or similar information to the one provided in some OBUs contained in the <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox⑤">AV1CodecConfigurationBox</a></span>. If the box definition does not indicate that its information overrides the OBU information, in case of conflict, the OBU information should be considered authoritative. 
+   <h3 class="heading settled" data-level="2.4" id="sampleformat"><span class="secno">2.4. </span><span class="content">AV1 Sample Format</span><a class="self-link" href="#sampleformat"></a></h3>
+   <p>For tracks using the <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry②">AV1SampleEntry</a>, an <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1-sample">AV1 Sample</dfn> has the following constraints:</p>
+   <ul>
+    <li data-md><span id="assert-9ba1392f">the sample data SHALL be a sequence of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39②">OBUs</a> forming a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑤">Temporal Unit</a></span>, 
+    <li data-md><span id="assert-f204884a">each OBU SHALL follow the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②①">open_bitstream_unit</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39③">Low Overhead Bitstream Format</a> syntax as specified in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a></span>. <span id="assert-f8d5b9b7">Each OBU SHALL have the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②②">obu_has_size_field</a> set to 1 except for the last OBU in the sample</span>, for which <span id="assert-d277b0cf"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②③">obu_has_size_field</a> MAY be set to 0, in which case it is assumed to fill the remainder of the sample</span>, 
+   </ul>
+   <p class="note" role="note"><span class="marker">NOTE:</span> <span id="assert-00151a99">When extracting OBUs from an ISOBMFF file, and depending on the capabilities of the decoder processing these OBUs, ISOBMFF parsers MAY need to either: set the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②④">obu_has_size_field</a> to 1 for some OBUs if not already set, add the size field in this case, and add <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46②">Temporal Delimiter OBU</a>; or use the length-delimited bitstream format as defined in Annex B of <a data-link-type="dfn" href="#av1s" id="ref-for-av1s">AV1</a>.</span> <span id="assert-e0aa5501">If encryption is used, similar operations MAY have to be done before or after decryption depending on the demuxer/decryptor/decoder architecture.</span></p>
+   <ul>
+    <li data-md><span id="assert-c2e52ab3">OBU trailing bits SHOULD be limited to byte alignment and SHOULD not be used for padding</span>, 
+    <li data-md><span id="assert-2487540d">OBUs of type OBU_TEMPORAL_DELIMITER, OBU_PADDING, or OBU_REDUNDANT_FRAME_HEADER SHOULD NOT be used</span>. 
+    <li data-md><span id="assert-c7a31be1">OBUs of type OBU_TILE_LIST SHALL NOT be used</span>. 
+   </ul>
+    <span id="assert-bee456d5">If an AV1 Sample is signaled as a sync sample (in the SyncSampleBox or by setting sample_is_non_sync_sample to 0), it SHALL be a Random Access Point as defined in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a></span>, i.e. satisfy the following constraints: 
+   <ul>
+    <li data-md>
      <p>Its first frame is a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑥">Key Frame</a> that has <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑤">show_frame</a> flag set to 1,</p>
-    </li><li data-md="">
+    <li data-md>
      <p>It contains a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑥">Sequence Header OBU</a> before the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49①">Frame Header OBU</a>.</p>
-   </li></ul>
-   <p class="note" role="note"><span>NOTE:</span> Within this definition, a sync sample may contain additional frames that are not Key Frames. The fact that none of them is the first frame in the temporal unit ensures that they are decodable.</p>
-   <p class="note" role="note"><span>NOTE:</span> Other types of OBUs such as <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46③">metadata OBUs</a> could be present before the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑦">Sequence Header OBU</a>.</p>
-   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑦">Intra-only frames</a> SHOULD be signaled using the sample_depends_on flag set to 2.</p>
-   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑦">Delayed Random Access Points</a> SHOULD be signaled using sample groups and the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1forwardkeyframesamplegroupentry" id="ref-for-av1forwardkeyframesamplegroupentry①">AV1ForwardKeyFrameSampleGroupEntry</a>.</p>
-   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑧">Switch Frames</a> SHOULD be signaled using sample groups and the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1switchframesamplegroupentry" id="ref-for-av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</a>.</p>
-   <p>Additionally, if a file contains multiple tracks that are alternative representations of the same content, in particular using <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑨">Switch Frames</a>, those tracks SHOULD be marked as belonging to the same alternate group and should use a track selection box with an appropriate attribute (e.g. <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①⑦">bitr</a>).</p>
-   <p>In tracks using the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry" id="ref-for-av1sampleentry③">AV1SampleEntry</a>, the <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①⑧">ctts</a> box and composition offsets in movie fragments SHALL NOT be used. Similarly, the is_leading flag, if used, SHALL be set to 0 or 2.</p>
-   <p>When a temporal unit contains more than one frame, the sample corresponding to that temporal unit MAY be marked using the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1multiframesamplegroupentry" id="ref-for-av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</a>.</p>
-   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46④">Metadata OBUs</a> may be carried in sample data. In this case, the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1metadatasamplegroupentry" id="ref-for-av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</a> SHOULD be used. If the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑤">metadata OBUs</a> are static for the entire set of samples associated with a given sample description entry, they SHOULD also be in the OBU array in the sample description entry.</p>
+   </ul>
+   <p class="note" role="note"><span class="marker">NOTE:</span> Within this definition, a sync sample may contain additional frames that are not Key Frames. The fact that none of them is the first frame in the temporal unit ensures that they are decodable.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> Other types of OBUs such as <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46③">metadata OBUs</a> could be present before the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑦">Sequence Header OBU</a>.</p>
+    <span id="assert-0c895956"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑦">Intra-only frames</a> SHOULD be signaled using the sample_depends_on flag set to 2</span>. <span id="assert-4f779503"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑦">Delayed Random Access Points</a> SHOULD be signaled using sample groups and the <a data-link-type="dfn" href="#av1forwardkeyframesamplegroupentry" id="ref-for-av1forwardkeyframesamplegroupentry①">AV1ForwardKeyFrameSampleGroupEntry</a></span>. <span id="assert-d10ee363"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑧">Switch Frames</a> SHOULD be signaled using sample groups and the <a data-link-type="dfn" href="#av1switchframesamplegroupentry" id="ref-for-av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</a></span>. 
+   <p>Additionally, <span id="assert-ccbd7555">if a file contains multiple tracks that are alternative representations of the same content, in particular using <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑨">Switch Frames</a>, those tracks SHOULD be marked as belonging to the same alternate group</span> and <span id="assert-2fee74f1">should use a track selection box with an appropriate attribute (e.g. <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①⑦">bitr</a>)</span>.</p>
+    <span id="assert-0f174d22">In tracks using the <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry③">AV1SampleEntry</a>, the <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①⑧">ctts</a> box and composition offsets in movie fragments SHALL NOT be used</span>. Similarly, <span id="assert-cb746c39">the is_leading flag, if used, SHALL be set to 0 or 2</span>. <span id="assert-227cd7b6">When a temporal unit contains more than one frame, the sample corresponding to that temporal unit MAY be marked using the <a data-link-type="dfn" href="#av1multiframesamplegroupentry" id="ref-for-av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</a></span>. <span id="assert-e8ac7f22"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46④">Metadata OBUs</a> may be carried in sample data</span>. In this case, <span id="assert-d41e5e3f">the <a data-link-type="dfn" href="#av1metadatasamplegroupentry" id="ref-for-av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</a> SHOULD be used</span>. <span id="assert-f0ce5ae3">If the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑤">metadata OBUs</a> are static for the entire set of samples associated with a given sample description entry, they SHOULD also be in the OBU array in the sample description entry</span>. 
    <p>Unless explicitely stated, the grouping_type_parameter is not defined for the SampleToGroupBox with grouping types defined in this specification.</p>
-   <h3 class="heading settled" data-level="2.5" id="forwardkeyframesamplegroupentry"><span class="secno">2.5. </span><span class="content">AV1 Forward Key Frame sample group entry</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry"></a></h3>
-   <h4 class="heading settled" data-level="2.5.1" id="forwardkeyframesamplegroupentry-definition"><span class="secno">2.5.1. </span><span class="content">Definition</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-definition"></a></h4>
-<pre class="def">Group Type: <dfn data-dfn-type="dfn" data-export="" id="av1f">av1f<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1f"></a></dfn>
+   <h3 class="heading settled" data-level="2.5" id="forwardkeyframesamplegroupentry"><span class="secno">2.5. </span><span class="content">AV1 Forward Key Frame sample group entry</span><a class="self-link" href="#forwardkeyframesamplegroupentry"></a></h3>
+   <h4 class="heading settled" data-level="2.5.1" id="forwardkeyframesamplegroupentry-definition"><span class="secno">2.5.1. </span><span class="content">Definition</span><a class="self-link" href="#forwardkeyframesamplegroupentry-definition"></a></h4>
+<pre class="def">Group Type: <dfn data-dfn-type="dfn" data-export id="av1f">av1f<a class="self-link" href="#av1f"></a></dfn>
 Container:  Sample Group Description Box ('sgpd')
-Mandatory:  No
-Quantity:   Zero or more.
+Mandatory:  <span id="assert-bafd7322">No</span>
+Quantity:   <span id="assert-5c97b843">Zero or more</span>.
 </pre>
-   <h4 class="heading settled" data-level="2.5.2" id="forwardkeyframesamplegroupentry-description"><span class="secno">2.5.2. </span><span class="content">Description</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-description"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</dfn> documents samples that contain a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑧">Delayed Random Access Point</a> that are followed at a given distance in the bitstream by a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑨">Key Frame Dependent Recovery Point</a>.</p>
-   <h4 class="heading settled" data-level="2.5.3" id="forwardkeyframesamplegroupentry-syntax"><span class="secno">2.5.3. </span><span class="content">Syntax</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-syntax"></a></h4>
+   <h4 class="heading settled" data-level="2.5.2" id="forwardkeyframesamplegroupentry-description"><span class="secno">2.5.2. </span><span class="content">Description</span><a class="self-link" href="#forwardkeyframesamplegroupentry-description"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</dfn> documents samples that contain a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑧">Delayed Random Access Point</a> that are followed at a given distance in the bitstream by a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑨">Key Frame Dependent Recovery Point</a>.</p>
+   <h4 class="heading settled" data-level="2.5.3" id="forwardkeyframesamplegroupentry-syntax"><span class="secno">2.5.3. </span><span class="content">Syntax</span><a class="self-link" href="#forwardkeyframesamplegroupentry-syntax"></a></h4>
 <pre>class AV1ForwardKeyFrameSampleGroupEntry extends VisualSampleGroupEntry('av1f') {
   unsigned int(8) fwd_distance;
 }
 </pre>
-   <h4 class="heading settled" data-level="2.5.4" id="forwardkeyframesamplegroupentry-semantics"><span class="secno">2.5.4. </span><span class="content">Semantics</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-semantics"></a></h4>
-   <p>The <dfn data-dfn-type="dfn" data-export="" id="fwd_distance">fwd_distance<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#fwd_distance"></a></dfn> field indicates the number of samples between this sample and the next sample containing the associated <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206①⓪">Key Frame Dependent Recovery Point</a>. 0 means the next sample.</p>
-   <h3 class="heading settled" data-level="2.6" id="multiframesamplegroupentry"><span class="secno">2.6. </span><span class="content">AV1 Multi-Frame sample group entry</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry"></a></h3>
-   <h4 class="heading settled" data-level="2.6.1" id="multiframesamplegroupentry-definition"><span class="secno">2.6.1. </span><span class="content">Definition</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry-definition"></a></h4>
-<pre class="def">Group Type: <dfn data-dfn-for="AV1MultiFrameSampleGroupEntry" data-dfn-type="value" data-export="" id="valdef-av1multiframesamplegroupentry-av1m">av1m<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#valdef-av1multiframesamplegroupentry-av1m"></a></dfn>
+   <h4 class="heading settled" data-level="2.5.4" id="forwardkeyframesamplegroupentry-semantics"><span class="secno">2.5.4. </span><span class="content">Semantics</span><a class="self-link" href="#forwardkeyframesamplegroupentry-semantics"></a></h4>
+   <p>The <dfn data-dfn-type="dfn" data-export id="fwd_distance">fwd_distance<a class="self-link" href="#fwd_distance"></a></dfn> field indicates the number of samples between this sample and the next sample containing the associated <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206①⓪">Key Frame Dependent Recovery Point</a>. 0 means the next sample.</p>
+   <h3 class="heading settled" data-level="2.6" id="multiframesamplegroupentry"><span class="secno">2.6. </span><span class="content">AV1 Multi-Frame sample group entry</span><a class="self-link" href="#multiframesamplegroupentry"></a></h3>
+   <h4 class="heading settled" data-level="2.6.1" id="multiframesamplegroupentry-definition"><span class="secno">2.6.1. </span><span class="content">Definition</span><a class="self-link" href="#multiframesamplegroupentry-definition"></a></h4>
+<pre class="def">Group Type: <dfn data-dfn-for="AV1MultiFrameSampleGroupEntry" data-dfn-type="value" data-export id="valdef-av1multiframesamplegroupentry-av1m">av1m<a class="self-link" href="#valdef-av1multiframesamplegroupentry-av1m"></a></dfn>
 Container:  Sample Group Description Box ('sgpd')
-Mandatory:  No
-Quantity:   Zero or more.
+Mandatory:  <span id="assert-bafd7322">No</span>
+Quantity:   <span id="assert-5c97b843">Zero or more</span>.
 </pre>
-   <h4 class="heading settled" data-level="2.6.2" id="multiframesamplegroupentry-description"><span class="secno">2.6.2. </span><span class="content">Description</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry-description"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</dfn> documents samples that contain multiple frames.</p>
-   <h4 class="heading settled" data-level="2.6.3" id="multiframesamplegroupentry-syntax"><span class="secno">2.6.3. </span><span class="content">Syntax</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry-syntax"></a></h4>
+   <h4 class="heading settled" data-level="2.6.2" id="multiframesamplegroupentry-description"><span class="secno">2.6.2. </span><span class="content">Description</span><a class="self-link" href="#multiframesamplegroupentry-description"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</dfn> documents samples that contain multiple frames.</p>
+   <h4 class="heading settled" data-level="2.6.3" id="multiframesamplegroupentry-syntax"><span class="secno">2.6.3. </span><span class="content">Syntax</span><a class="self-link" href="#multiframesamplegroupentry-syntax"></a></h4>
 <pre>class AV1MultiFrameSampleGroupEntry extends VisualSampleGroupEntry('av1m') {
 }
 </pre>
-   <h3 class="heading settled" data-level="2.7" id="switchframesamplegroupentry"><span class="secno">2.7. </span><span class="content">AV1 Switch Frame sample group entry</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry"></a></h3>
-   <h4 class="heading settled" data-level="2.7.1" id="switchframesamplegroupentry-definition"><span class="secno">2.7.1. </span><span class="content">Definition</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry-definition"></a></h4>
-<pre class="def">Group Type: <dfn class="dfn-paneled" data-dfn-type="dfn" data-export="" id="av1s">av1s</dfn>
+   <h3 class="heading settled" data-level="2.7" id="switchframesamplegroupentry"><span class="secno">2.7. </span><span class="content">AV1 Switch Frame sample group entry</span><a class="self-link" href="#switchframesamplegroupentry"></a></h3>
+   <h4 class="heading settled" data-level="2.7.1" id="switchframesamplegroupentry-definition"><span class="secno">2.7.1. </span><span class="content">Definition</span><a class="self-link" href="#switchframesamplegroupentry-definition"></a></h4>
+<pre class="def">Group Type: <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="av1s">av1s</dfn>
 Container:  Sample Group Description Box ('sgpd')
-Mandatory:  No
-Quantity:   Zero or more.
+Mandatory:  <span id="assert-bafd7322">No</span>
+Quantity:   <span id="assert-5c97b843">Zero or more</span>.
 </pre>
-   <h4 class="heading settled" data-level="2.7.2" id="switchframesamplegroupentry-description"><span class="secno">2.7.2. </span><span class="content">Description</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry-description"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</dfn> documents samples that start with a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13①⓪">Switch Frame</a>.</p>
-   <h4 class="heading settled" data-level="2.7.3" id="switchframesamplegroupentry-syntax"><span class="secno">2.7.3. </span><span class="content">Syntax</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry-syntax"></a></h4>
+   <h4 class="heading settled" data-level="2.7.2" id="switchframesamplegroupentry-description"><span class="secno">2.7.2. </span><span class="content">Description</span><a class="self-link" href="#switchframesamplegroupentry-description"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</dfn> documents samples that start with a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13①⓪">Switch Frame</a>.</p>
+   <h4 class="heading settled" data-level="2.7.3" id="switchframesamplegroupentry-syntax"><span class="secno">2.7.3. </span><span class="content">Syntax</span><a class="self-link" href="#switchframesamplegroupentry-syntax"></a></h4>
 <pre>class AV1SwitchFrameSampleGroupEntry extends VisualSampleGroupEntry('av1s') {
 }
 </pre>
-   <h3 class="heading settled" data-level="2.8" id="metadatasamplegroupentry"><span class="secno">2.8. </span><span class="content">AV1 Metadata sample group entry</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry"></a></h3>
-   <h4 class="heading settled" data-level="2.8.1" id="metadatasamplegroupentry-definition"><span class="secno">2.8.1. </span><span class="content">Definition</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-definition"></a></h4>
-<pre class="def">Group Type: <dfn data-dfn-for="AV1MetadataSampleGroupEntry" data-dfn-type="value" data-noexport="" id="valdef-av1metadatasamplegroupentry-av1m">av1M<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#valdef-av1metadatasamplegroupentry-av1m"></a></dfn>
+   <h3 class="heading settled" data-level="2.8" id="metadatasamplegroupentry"><span class="secno">2.8. </span><span class="content">AV1 Metadata sample group entry</span><a class="self-link" href="#metadatasamplegroupentry"></a></h3>
+   <h4 class="heading settled" data-level="2.8.1" id="metadatasamplegroupentry-definition"><span class="secno">2.8.1. </span><span class="content">Definition</span><a class="self-link" href="#metadatasamplegroupentry-definition"></a></h4>
+<pre class="def">Group Type: <dfn data-dfn-for="AV1MetadataSampleGroupEntry" data-dfn-type="value" data-noexport id="valdef-av1metadatasamplegroupentry-av1m">av1M<a class="self-link" href="#valdef-av1metadatasamplegroupentry-av1m"></a></dfn>
 Container:  Sample Group Description Box ('sgpd')
-Mandatory:  No
-Quantity:   Zero or more.
+Mandatory:  <span id="assert-bafd7322">No</span>
+Quantity:   <span id="assert-5c97b843">Zero or more</span>.
 </pre>
-   <h4 class="heading settled" data-level="2.8.2" id="metadatasamplegroupentry-description"><span class="secno">2.8.2. </span><span class="content">Description</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-description"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</dfn> documents samples that contain <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑥">metadata OBUs</a>. The <code>grouping_type_parameter</code> can be used to identify samples containing <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑦">metadata OBUs</a> of a given type. If no <code>grouping_type_parameter</code> is provided, the sample group entry identifies samples containing <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑧">metadata OBUs</a> for which the <code>metadata_type</code> is unknown.</p>
-   <h4 class="heading settled" data-level="2.8.3" id="metadatasamplegroupentry-syntax"><span class="secno">2.8.3. </span><span class="content">Syntax</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-syntax"></a></h4>
+   <h4 class="heading settled" data-level="2.8.2" id="metadatasamplegroupentry-description"><span class="secno">2.8.2. </span><span class="content">Description</span><a class="self-link" href="#metadatasamplegroupentry-description"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</dfn> documents samples that contain <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑥">metadata OBUs</a>. The <code>grouping_type_parameter</code> can be used to identify samples containing <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑦">metadata OBUs</a> of a given type. If no <code>grouping_type_parameter</code> is provided, the sample group entry identifies samples containing <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑧">metadata OBUs</a> for which the <code>metadata_type</code> is unknown.</p>
+   <h4 class="heading settled" data-level="2.8.3" id="metadatasamplegroupentry-syntax"><span class="secno">2.8.3. </span><span class="content">Syntax</span><a class="self-link" href="#metadatasamplegroupentry-syntax"></a></h4>
 <pre>class AV1MetadataSampleGroupEntry extends VisualSampleGroupEntry('av1M') {
 }
 </pre>
@@ -2288,150 +2330,124 @@ <h4 class="heading settled" data-level="2.8.3" id="metadatasamplegroupentry-synt
    unsigned int (24) metadata_specific_parameters;
 }
 </pre>
-   <h4 class="heading settled" data-level="2.8.4" id="metadatasamplegroupentry-semantics"><span class="secno">2.8.4. </span><span class="content">Semantics</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-semantics"></a></h4>
-   <p><dfn data-dfn-type="dfn" data-export="" id="metadata_type">metadata_type<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadata_type"></a></dfn> is a 8-bit field whose value is the value of the metadata_type field defined in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a>, when it is equal or lower than 255. metadata_type values above 255 are not supported by this sample group.</p>
-   <p><dfn data-dfn-type="dfn" data-export="" id="metadata_specific_parameters">metadata_specific_parameters<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadata_specific_parameters"></a></dfn> provides an additional part of the <code>grouping_type_parameter</code>, which MAY be used to distinguish different sample groups having the same <code>metadata_type</code> but different sub-parameters. In this version of the specification, <code>metadata_specific_parameters</code> is only defined when <code>metadata_type</code> is set to <code>METADATA_TYPE_ITUT_T35</code> in which case its value SHALL be set to the first 24 bits of the <code>metadata_itut_t35</code> structure. For other types of metadata, its value SHOULD be set to 0. In all cases, when the <code>grouping_type_parameter</code> is used, readers processing sample groups SHALL use the entire value of <code>grouping_type_parameter</code>.</p>
-   <h2 class="heading settled" data-level="3" id="cmaf"><span class="secno">3. </span><span class="content">CMAF AV1 track format</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#cmaf"></a></h2>
-   <p><a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cmaf">[CMAF]</a> defines structural constraints on ISOBMFF files additional to <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-isobmff">[ISOBMFF]</a> for the purpose of, for example, adaptive streaming or for protected files. Conformance to these structural constraints is signaled by the presence of the brand <code><a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="termref-for-①⑨">cmfc</a></code> in the <code>FileTypeBox</code>.</p>
-   <p>If a <a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="termref-for-②⓪">CMAF Video Track</a> uses the brand <code>av01</code>, it is called a <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="cmaf-av1-track">CMAF AV1 Track</dfn> and the following constraints, defining the CMAF Media Profile for AV1, apply:</p>
-   <ul>
-    <li data-md="">
-     <p>it SHALL use an <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry" id="ref-for-av1sampleentry④">AV1SampleEntry</a></p>
-    </li><li data-md="">
-     <p>it MAY use multiple sample entries, and in that case the following values SHALL not change in the track:</p>
+   <h4 class="heading settled" data-level="2.8.4" id="metadatasamplegroupentry-semantics"><span class="secno">2.8.4. </span><span class="content">Semantics</span><a class="self-link" href="#metadatasamplegroupentry-semantics"></a></h4>
+   <p><dfn data-dfn-type="dfn" data-export id="metadata_type">metadata_type<a class="self-link" href="#metadata_type"></a></dfn> is a 8-bit field whose value is the value of the metadata_type field defined in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a>, when it is equal or lower than 255. metadata_type values above 255 are not supported by this sample group.</p>
+   <p><dfn data-dfn-type="dfn" data-export id="metadata_specific_parameters">metadata_specific_parameters<a class="self-link" href="#metadata_specific_parameters"></a></dfn> provides an additional part of the <code>grouping_type_parameter</code>, which MAY be used to distinguish different sample groups having the same <code>metadata_type</code> but different sub-parameters. <span id="assert-7d13a03d">In this version of the specification, <code>metadata_specific_parameters</code> is only defined when <code>metadata_type</code> is set to <code>METADATA_TYPE_ITUT_T35</code> in which case its value SHALL be set to the first 24 bits of the <code>metadata_itut_t35</code> structure.</span> <span id="assert-973cddc9">For other types of metadata, its value SHOULD be set to 0. In all cases, when the <code>grouping_type_parameter</code> is used, readers processing sample groups SHALL use the entire value of <code>grouping_type_parameter</code></span>.</p>
+   <h2 class="heading settled" data-level="3" id="cmaf"><span class="secno">3. </span><span class="content">CMAF AV1 track format</span><a class="self-link" href="#cmaf"></a></h2>
+   <p><a data-link-type="biblio" href="#biblio-cmaf" title="Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media">[CMAF]</a> defines structural constraints on ISOBMFF files additional to <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a> for the purpose of, for example, adaptive streaming or for protected files. Conformance to these structural constraints is signaled by the presence of the brand <code><a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="ref-for-something①⑨">cmfc</a></code> in the <code>FileTypeBox</code>.</p>
+   <p>If a <a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="ref-for-something②⓪">CMAF Video Track</a> uses the brand <code>av01</code>, it is called a <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="cmaf-av1-track">CMAF AV1 Track</dfn> and the following constraints, defining the CMAF Media Profile for AV1, apply:</p>
+   <ul>
+    <li data-md><span id="assert-f261aa51">it SHALL use an <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry④">AV1SampleEntry</a></span> 
+    <li data-md>
+     <span id="assert-aec6597a">it MAY use multiple sample entries, and in that case the following values SHALL not change in the track</span>: 
      <ul>
-      <li data-md="">
+      <li data-md>
        <p><code>seq_profile</code></p>
-      </li><li data-md="">
+      <li data-md>
        <p><code>still_picture</code></p>
-      </li><li data-md="">
+      <li data-md>
        <p>the first value of <code>seq_level_idx</code></p>
-      </li><li data-md="">
+      <li data-md>
        <p>the first value of <code>seq_tier</code></p>
-      </li><li data-md="">
+      <li data-md>
        <p><code>color_config</code></p>
-      </li><li data-md="">
+      <li data-md>
        <p><code>initial_presentation_delay_minus_one</code></p>
-     </li></ul>
-   </li></ul>
-   <p>When protected, <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#cmaf-av1-track" id="ref-for-cmaf-av1-track">CMAF AV1 Tracks</a> SHALL use the signaling defined in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cmaf">[CMAF]</a>, which in turn relies on <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cenc">[CENC]</a>, with the provisions specified in <a href="https://aomediacodec.github.io/av1-isobmff/#CommonEncryption">§ 4 Common Encryption</a>.</p>
-   <h2 class="heading settled" data-level="4" id="CommonEncryption"><span class="secno">4. </span><span class="content">Common Encryption</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#CommonEncryption"></a></h2>
-   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#cmaf-av1-track" id="ref-for-cmaf-av1-track①">CMAF AV1 Tracks</a> and non-segmented AV1 files MAY be protected. If protected, they SHALL conform to <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cenc">[CENC]</a>. Files SHOULD be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②①">cbcs</a></code> protection scheme and MAY be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②②">cenc</a></code> protection scheme.</p>
-   <p>When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②③">cenc</a></code> is used, samples SHALL be protected using subsample encryption and SHALL NOT use pattern encryption.</p>
-   <p>When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②④">cbcs</a></code> is used, samples SHALL be protected using subsample encryption and SHALL use pattern encryption. <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cenc">[CENC]</a> recommends that the Block Pattern length be 10, i.e. <code>crypt_byte_block + skip_byte_block = 10</code>, where a Block is of size 16-bytes. In this specification, the combination of <code>crypt_byte_block</code> and <code>skip_byte_block</code> SHALL be one of the following, with the first one being recommended:</p>
-   <ul>
-    <li data-md="">
-     <p><code>crypt_byte_block = 1</code> and <code>skip_byte_block = 9</code>,</p>
-    </li><li data-md="">
-     <p><code>crypt_byte_block = 5</code> and <code>skip_byte_block = 5</code>,</p>
-    </li><li data-md="">
-     <p><code>crypt_byte_block = 10</code> and <code>skip_byte_block = 0</code>.</p>
-   </li></ul>
-   <h3 class="heading settled" data-level="4.1" id="subsample-encryption"><span class="secno">4.1. </span><span class="content">General Subsample Encryption constraints</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#subsample-encryption"></a></h3>
+     </ul>
+   </ul>
+    <span id="assert-7250f9ce">When protected, <a data-link-type="dfn" href="#cmaf-av1-track" id="ref-for-cmaf-av1-track">CMAF AV1 Tracks</a> SHALL use the signaling defined in <a data-link-type="biblio" href="#biblio-cmaf" title="Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media">[CMAF]</a>, which in turn relies on <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a>, with the provisions specified in <a href="#CommonEncryption">§ 4 Common Encryption</a></span>. 
+   <h2 class="heading settled" data-level="4" id="CommonEncryption"><span class="secno">4. </span><span class="content">Common Encryption</span><a class="self-link" href="#CommonEncryption"></a></h2>
+    <span id="assert-6eb63a07"><a data-link-type="dfn" href="#cmaf-av1-track" id="ref-for-cmaf-av1-track①">CMAF AV1 Tracks</a> and non-segmented AV1 files MAY be protected</span>. <span id="assert-89e67c25">If protected, they SHALL conform to <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a></span>. <span id="assert-2a42f17e">Files SHOULD be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②①">cbcs</a></code> protection scheme</span> and <span id="assert-105dfb43">MAY be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②②">cenc</a></code> protection scheme</span>. <span id="assert-44221cba">When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②③">cenc</a></code> is used, samples SHALL be protected using subsample encryption</span> and <span id="assert-aa4aefdb">SHALL NOT use pattern encryption</span>. <span id="assert-0113b336">When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②④">cbcs</a></code> is used, samples SHALL be protected using subsample encryption</span> and <span id="assert-95fbc893">SHALL use pattern encryption</span>. <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a> recommends that the Block Pattern length be 10, i.e. <code>crypt_byte_block + skip_byte_block = 10</code>, where a Block is of size 16-bytes. In this specification, the combination of <code>crypt_byte_block</code> and <code>skip_byte_block</code> SHALL be one of the following, with the first one being recommended: 
+   <ul>
+    <li data-md><span id="assert-51e8a94d"><code>crypt_byte_block = 1</code> and <code>skip_byte_block = 9</code></span>, 
+    <li data-md><span id="assert-973b126b"><code>crypt_byte_block = 5</code> and <code>skip_byte_block = 5</code></span>, 
+    <li data-md><span id="assert-0fbb54b0"><code>crypt_byte_block = 10</code> and <code>skip_byte_block = 0</code></span>. 
+   </ul>
+   <h3 class="heading settled" data-level="4.1" id="subsample-encryption"><span class="secno">4.1. </span><span class="content">General Subsample Encryption constraints</span><a class="self-link" href="#subsample-encryption"></a></h3>
    <p>Within protected samples, the following constraints apply:</p>
    <ul>
-    <li data-md="">
-     <p>Protected samples SHALL be exactly spanned by one or more contiguous subsamples.</p>
+    <li data-md>
+     <span id="assert-d84cddee">Protected samples SHALL be exactly spanned by one or more contiguous subsamples</span>. 
      <ul>
-      <li data-md="">
-       <p>An OBU MAY be spanned by one or more subsamples, especially when it has multiple ranges of protected data. However, as recommended in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cenc">[CENC]</a>, writers SHOULD reduce the number of subsamples as possible. This can be achieved by using a subsample that spans multiple consecutive unprotected OBUs as well as the first unprotected and protected parts of the following protected OBU, if such protected OBU exists.</p>
-      </li><li data-md="">
-       <p>A large unprotected OBU whose data size is larger than the maximum size of a single <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②⑤">BytesOfClearData</a> field MAY be spanned by multiple subsamples with zero size <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②⑥">BytesOfProtectedData</a>.</p>
-     </li></ul>
-    </li><li data-md="">
-     <p>All <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40" id="ref-for-page=40①">OBU Headers</a> and associated <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑥">obu_size</a> fields SHALL be unprotected.</p>
-    </li><li data-md="">
-     <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑨">Temporal Delimiter OBUs</a>, <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑧">Sequence Header OBUs</a>, and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49②">Frame Header OBUs</a> (including within a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71">Frame OBU</a>), <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121①">Redundant Frame Header OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121②">Padding OBUs</a> SHALL be unprotected.</p>
-    </li><li data-md="">
-     <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46①⓪">Metadata OBUs</a> MAY be protected.</p>
-    </li><li data-md="">
-     <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71①">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71②">Frame OBUs</a> SHALL be protected. Within <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71③">Tile Group OBUs</a> or <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71④">Frame OBUs</a>, the following applies:</p>
+      <li data-md><span id="assert-38a31899">An OBU MAY be spanned by one or more subsamples</span>, especially when it has multiple ranges of protected data. However, as recommended in <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a>, writers SHOULD reduce the number of subsamples as possible. This can be achieved by using a subsample that spans multiple consecutive unprotected OBUs as well as the first unprotected and protected parts of the following protected OBU, if such protected OBU exists. 
+      <li data-md><span id="assert-02d6b0e9">A large unprotected OBU whose data size is larger than the maximum size of a single <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②⑤">BytesOfClearData</a> field MAY be spanned by multiple subsamples with zero size <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②⑥">BytesOfProtectedData</a></span>. 
+     </ul>
+    <li data-md><span id="assert-b8cabcad">All <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40" id="ref-for-page=40①">OBU Headers</a> and associated <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑥">obu_size</a> fields SHALL be unprotected</span>. 
+    <li data-md><span id="assert-4b9592fb"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑨">Temporal Delimiter OBUs</a>, <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑧">Sequence Header OBUs</a>, and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49②">Frame Header OBUs</a> (including within a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71">Frame OBU</a>), <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121①">Redundant Frame Header OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121②">Padding OBUs</a> SHALL be unprotected</span>. 
+    <li data-md><span id="assert-9aa91460"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46①⓪">Metadata OBUs</a> MAY be protected</span>. 
+    <li data-md>
+     <span id="assert-8750fa6f"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71①">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71②">Frame OBUs</a> SHALL be protected</span>. Within <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71③">Tile Group OBUs</a> or <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71④">Frame OBUs</a>, the following applies: 
      <ul>
-      <li data-md="">
-       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②⑦">cbcs</a></code>:</p>
+      <li data-md>
+       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②⑦">cbcs</a></code>:</p>
        <ul>
-        <li data-md="">
-         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②⑧">BytesOfProtectedData</a> SHALL start on the first byte and end on the last byte of the <code>decode_tile</code> structure (including any trailing bits).</p>
-       </li></ul>
-       <p class="note" role="note"><span>NOTE:</span> As a result of the above, <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②⑨">BytesOfProtectedData</a> is not necessarily a multiple of 16 bytes and partial blocks are included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③⓪">BytesOfProtectedData</a> range, but per <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cenc">[CENC]</a> the data is not be encrypted.</p>
+        <li data-md><span id="assert-61f691fe"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②⑧">BytesOfProtectedData</a> SHALL start on the first byte and end on the last byte of the <code>decode_tile</code> structure (including any trailing bits)</span>. 
+       </ul>
+       <p class="note" role="note"><span class="marker">NOTE:</span> As a result of the above, <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②⑨">BytesOfProtectedData</a> is not necessarily a multiple of 16 bytes and partial blocks are included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③⓪">BytesOfProtectedData</a> range, but per <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a> the data is not be encrypted.</p>
        <ul>
-        <li data-md="">
-         <p>A subsample SHALL be created for each tile, even if its size is less than 16 bytes.</p>
-        </li><li data-md="">
-         <p>All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑤">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑥">Frame OBUs</a> SHALL be unprotected.</p>
-       </li></ul>
-      </li><li data-md="">
-       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③①">cenc</a></code>:</p>
+        <li data-md><span id="assert-6547e5e3">A subsample SHALL be created for each tile, even if its size is less than 16 bytes</span>. 
+        <li data-md><span id="assert-606a0a3a">All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑤">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑥">Frame OBUs</a> SHALL be unprotected</span>. 
+       </ul>
+      <li data-md>
+       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③①">cenc</a></code>:</p>
        <ul>
-        <li data-md="">
-         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③②">BytesOfProtectedData</a> SHALL be a multiple of 16 bytes.</p>
-        </li><li data-md="">
-         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③③">BytesOfProtectedData</a> SHALL end on the last byte of the <code>decode_tile</code> structure (including any trailing bits).</p>
-        </li><li data-md="">
-         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③④">BytesOfProtectedData</a> SHALL span all complete 16-byte blocks of the <code>decode_tile</code> structure (including any trailing bits).</p>
-       </li></ul>
-       <p class="note" role="note"><span>NOTE:</span> As a result of the above, partial blocks are not used and it is possible that <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③⑤">BytesOfProtectedData</a> does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.</p>
+        <li data-md><span id="assert-da5e71ae"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③②">BytesOfProtectedData</a> SHALL be a multiple of 16 bytes</span>. 
+        <li data-md><span id="assert-839432b2"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③③">BytesOfProtectedData</a> SHALL end on the last byte of the <code>decode_tile</code> structure (including any trailing bits)</span>. 
+        <li data-md><span id="assert-b9de48fc"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③④">BytesOfProtectedData</a> SHALL span all complete 16-byte blocks of the <code>decode_tile</code> structure (including any trailing bits)</span>. 
+       </ul>
+       <p class="note" role="note"><span class="marker">NOTE:</span> As a result of the above, partial blocks are not used and it is possible that <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③⑤">BytesOfProtectedData</a> does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.</p>
        <ul>
-        <li data-md="">
-         <p>A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes. If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③⑥">BytesOfClearData</a> field of a surrounding subsample, if any.</p>
-        </li><li data-md="">
-         <p>All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑦">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑧">Frame OBUs</a> SHALL be unprotected.</p>
-       </li></ul>
-     </li></ul>
-   </li></ul>
-   <h3 class="heading settled" data-level="4.2" id="subsample-encryption-illustration"><span class="secno">4.2. </span><span class="content">Subsample Encryption Illustration</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#subsample-encryption-illustration"></a></h3>
+        <li data-md><span id="assert-df6aa49f">A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes</span>. <span id="assert-e145e592">If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③⑥">BytesOfClearData</a> field of a surrounding subsample, if any</span>. 
+        <li data-md><span id="assert-606a0a3a">All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑦">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑧">Frame OBUs</a> SHALL be unprotected</span>. 
+       </ul>
+     </ul>
+   </ul>
+   <h3 class="heading settled" data-level="4.2" id="subsample-encryption-illustration"><span class="secno">4.2. </span><span class="content">Subsample Encryption Illustration</span><a class="self-link" href="#subsample-encryption-illustration"></a></h3>
     Figure #1 illustrates Subsample based encryption of AV1. 
    <figure>
-     <img alt="Subsample-based AV1 encryption" src="./v1.2.0_files/subsample_encryption.svg"> 
+     <img alt="Subsample-based AV1 encryption" src="images/subsample_encryption.svg"> 
     <figcaption>Subsample-based AV1 encryption.</figcaption>
    </figure>
-   <h2 class="heading settled" data-level="5" id="codecsparam"><span class="secno">5. </span><span class="content">Codecs Parameter String</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#codecsparam"></a></h2>
-   <p>DASH and other applications require defined values for the <a class="property" data-link-type="propdesc" href="https://tools.ietf.org/html/rfc6381#" id="termref-for-③⑦">Codecs</a> parameter specified in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-rfc6381">[RFC6381]</a> for ISO Media tracks. The codecs parameter string for the AOM AV1 codec is as follows:</p>
-<pre>&lt;sample entry 4CC&gt;.&lt;profile&gt;.&lt;level&gt;&lt;tier&gt;.&lt;bitDepth&gt;.&lt;monochrome&gt;.&lt;chromaSubsampling&gt;.
-&lt;colorPrimaries&gt;.&lt;transferCharacteristics&gt;.&lt;matrixCoefficients&gt;.&lt;videoFullRangeFlag&gt;
+   <h2 class="heading settled" data-level="5" id="codecsparam"><span class="secno">5. </span><span class="content">Codecs Parameter String</span><a class="self-link" href="#codecsparam"></a></h2>
+   <p>DASH and other applications require defined values for the <a class="property css" data-link-type="property" href="https://tools.ietf.org/html/rfc6381#" id="ref-for-something③⑦">Codecs</a> parameter specified in <a data-link-type="biblio" href="#biblio-rfc6381" title="The &apos;Codecs&apos; and &apos;Profiles&apos; Parameters for &quot;Bucket&quot; Media Types">[RFC6381]</a> for ISO Media tracks. The codecs parameter string for the AOM AV1 codec is as follows:</p>
+<pre>&lt;sample entry 4CC>.&lt;profile>.&lt;level>&lt;tier>.&lt;bitDepth>.&lt;monochrome>.&lt;chromaSubsampling>.
+&lt;colorPrimaries>.&lt;transferCharacteristics>.&lt;matrixCoefficients>.&lt;videoFullRangeFlag>
 </pre>
    <p>All fields following the sample entry 4CC are expressed as double digit decimals, unless indicated otherwise. Leading or trailing zeros cannot be omitted.</p>
-   <p>The profile parameter value, represented by a single digit decimal, SHALL equal the value of seq_profile in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑨">Sequence Header OBU</a>.</p>
-   <p>The level parameter value SHALL equal the first level value indicated by <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑦">seq_level_idx</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③⓪">Sequence Header OBU</a>.</p>
-   <p>The tier parameter value SHALL be equal to <code>M</code> when the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑧">seq_tier</a> value in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③①">Sequence Header OBU</a> is equal to 0, and <code>H</code> when it is equal to 1.</p>
-   <p>The bitDepth parameter value SHALL equal the value of BitDepth variable as defined in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a> derived from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③②">Sequence Header OBU</a>.</p>
-   <p>The monochrome parameter value, represented by a single digit decimal, SHALL equal the value of mono_chrome in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③③">Sequence Header OBU</a>.</p>
-   <p>The chromaSubsampling parameter value, represented by a three-digit decimal, SHALL have its first digit equal to subsampling_x and its second digit equal to subsampling_y. If both subsampling_x and subsampling_y are set to 1, then the third digit SHALL be equal to chroma_sample_position, otherwise it SHALL be set to 0.</p>
-   <p>The colorPrimaries, transferCharacteristics, matrixCoefficients, and videoFullRangeFlag parameter values SHALL equal the value of matching fields in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③④">Sequence Header OBU</a>, if color_description_present_flag is set to 1, otherwise they SHOULD not be set, defaulting to the values below. The videoFullRangeFlag is represented by a single digit.</p>
+    <span id="assert-f6db4381">The profile parameter value, represented by a single digit decimal, SHALL equal the value of seq_profile in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑨">Sequence Header OBU</a></span>. <span id="assert-d4b4ccd9">The level parameter value SHALL equal the first level value indicated by <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑦">seq_level_idx</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③⓪">Sequence Header OBU</a></span>. <span id="assert-67559f48">The tier parameter value SHALL be equal to <code>M</code> when the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑧">seq_tier</a> value in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③①">Sequence Header OBU</a> is equal to 0, and <code>H</code> when it is equal to 1</span>. <span id="assert-bcdf4133">The bitDepth parameter value SHALL equal the value of BitDepth variable as defined in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a> derived from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③②">Sequence Header OBU</a></span>. <span id="assert-dfda6ebb">The monochrome parameter value, represented by a single digit decimal, SHALL equal the value of mono_chrome in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③③">Sequence Header OBU</a></span>. <span id="assert-cc705e14">The chromaSubsampling parameter value, represented by a three-digit decimal, SHALL have its first digit equal to subsampling_x and its second digit equal to subsampling_y</span>. <span id="assert-63b6ae0e">If both subsampling_x and subsampling_y are set to 1, then the third digit SHALL be equal to chroma_sample_position, otherwise it SHALL be set to 0</span>. <span id="assert-3d3eb1d7">The colorPrimaries, transferCharacteristics, matrixCoefficients, and videoFullRangeFlag parameter values SHALL equal the value of matching fields in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③④">Sequence Header OBU</a>, if color_description_present_flag is set to 1</span>, <span id="assert-44eca350">otherwise they SHOULD not be set, defaulting to the values below</span>. The videoFullRangeFlag is represented by a single digit. 
    <p>For example, codecs="av01.0.04M.10.0.112.09.16.09.0" represents AV1 Main Profile, level 3.0, Main tier, 10-bit content, non-monochrome, with 4:2:0 chroma subsampling co-located with (0, 0) luma sample, ITU-R BT.2100 color primaries, ITU-R BT.2100 PQ transfer characteristics, ITU-R BT.2100 YCbCr color matrix, and studio swing representation.</p>
-   <p>The parameters sample entry 4CC, profile, level, tier, and bitDepth are all mandatory fields. If any of these fields are empty, or not within their allowed range, the processing device SHOULD treat it as an error.</p>
-   <p>All the other fields (including their leading '.') are optional, mutually inclusive (all or none) fields. If not specified then the values listed in the table below are assumed.</p>
+    <span id="assert-041ae5cf">The parameters sample entry 4CC, profile, level, tier, and bitDepth are all mandatory fields</span>. If any of these fields are empty, or not within their allowed range, the processing device SHOULD treat it as an error. <span id="assert-426c6407">All the other fields (including their leading '.') are optional, mutually inclusive (all or none) fields</span>. If not specified then the values listed in the table below are assumed. 
    <table class="def">
     <tbody>
      <tr>
       <td>mono_chrome
-      </td><td>0
-     </td></tr><tr>
+      <td>0
+     <tr>
       <td>chromaSubsampling
-      </td><td>110 (4:2:0)
-     </td></tr><tr>
+      <td>110 (4:2:0)
+     <tr>
       <td>colorPrimaries
-      </td><td>1 (ITU-R BT.709)
-     </td></tr><tr>
+      <td>1 (ITU-R BT.709)
+     <tr>
       <td>transferCharacteristics
-      </td><td>1 (ITU-R BT.709)
-     </td></tr><tr>
+      <td>1 (ITU-R BT.709)
+     <tr>
       <td>matrixCoefficients
-      </td><td>1 (ITU-R BT.709)
-     </td></tr><tr>
+      <td>1 (ITU-R BT.709)
+     <tr>
       <td>videoFullRangeFlag
-      </td><td>0 (studio swing representation)
-   </td></tr></tbody></table>
+      <td>0 (studio swing representation)
+   </table>
    <p>The string codecs="av01.0.01M.08" in this case would represent AV1 Main Profile, level 2.1, Main tier, 8-bit content with 4:2:0 chroma subsampling, ITU-R BT.709 color primaries, transfer characteristics, matrix coefficients, and studio swing representation.</p>
    <p>If any character that is not '.', digits, part of the AV1 4CC, or a tier value is encountered, the string SHALL be interpreted ignoring all the characters starting from that character.</p>
-   <h2 class="heading settled" data-level="6" id="changelist"><span class="secno">6. </span><span class="content">Changes since v1.1.0 release</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#changelist"></a></h2>
+   <h2 class="heading settled" data-level="6" id="changelist"><span class="secno">6. </span><span class="content">Changes since v1.1.0 release</span><a class="self-link" href="#changelist"></a></h2>
    <ul>
-    <li data-md="">
+    <li data-md>
      <p><a href="https://github.com/AOMediaCodec/av1-isobmff/pull/116"> Change tile/subsample alignement for the <code>cbcs</code> protection scheme.</a></p>
-   </li></ul>
+   </ul>
   </main>
   <div data-fill-with="conformance">
-   <h2 class="no-ref no-num heading settled" id="conformance"><span class="content"> Conformance</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#conformance"></a></h2>
+   <h2 class="no-ref no-num heading settled" id="conformance"><span class="content"> Conformance</span><a class="self-link" href="#conformance"></a></h2>
    <p> Conformance requirements are expressed with a combination of descriptive assertions and RFC 2119 terminology.
             The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL”
             in the normative parts of this document
@@ -2439,13 +2455,13 @@ <h2 class="no-ref no-num heading settled" id="conformance"><span class="content"
             However, for readability,
             these words do not appear in all uppercase letters in this specification. </p>
    <p> All of the text of this specification is normative
-            except sections explicitly marked as non-normative, examples, and notes. <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-rfc2119">[RFC2119]</a> </p>
+            except sections explicitly marked as non-normative, examples, and notes. <a data-link-type="biblio" href="#biblio-rfc2119" title="Key words for use in RFCs to Indicate Requirement Levels">[RFC2119]</a> </p>
    <p> Examples in this specification are introduced with the words “for example”
             or are set apart from the normative text with <code>class="example"</code>, like this: </p>
-   <div class="example" id="example-example"><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#example-example"></a> This is an example of an informative example. </div>
+   <div class="example" id="example-example"><a class="self-link" href="#example-example"></a> This is an example of an informative example. </div>
    <p> Informative notes begin with the word “Note”
             and are set apart from the normative text with <code>class="note"</code>, like this: </p>
-   <p class="note" role="note"> Note, this is an informative note. </p>
+   <p class="note" role="note"> Note, this is an informative note.</p>
   </div>
 <script>
 (function() {
@@ -2576,793 +2592,724 @@ <h2 class="no-ref no-num heading settled" id="conformance"><span class="content"
 
 })();
 </script>
-  <h2 class="no-num no-ref heading settled" id="index"><span class="content">Index</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#index"></a></h2>
-  <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="content">Terms defined by this specification</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#index-defined-here"></a></h3>
+  <h2 class="no-num no-ref heading settled" id="index"><span class="content">Index</span><a class="self-link" href="#index"></a></h2>
+  <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="content">Terms defined by this specification</span><a class="self-link" href="#index-defined-here"></a></h3>
   <ul class="index">
    <li>
     av01
     <ul>
-     <li><a href="https://aomediacodec.github.io/av1-isobmff/#valdef-av1sampleentry-av01">value for AV1SampleEntry</a><span>, in § 2.2.1</span>
-     </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#valdef-isobmff-brand-av01">value for ISOBMFF Brand</a><span>, in § 2.1</span>
-    </li></ul>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1c">av1C</a><span>, in § 2.3.1</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox">AV1CodecConfigurationBox</a><span>, in § 2.3.2</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1f">av1f</a><span>, in § 2.5.1</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</a><span>, in § 2.5.2</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#valdef-av1metadatasamplegroupentry-av1m">av1M</a><span>, in § 2.8.1</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#valdef-av1multiframesamplegroupentry-av1m">av1m</a><span>, in § 2.6.1</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</a><span>, in § 2.8.2</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</a><span>, in § 2.6.2</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1s">av1s</a><span>, in § 2.7.1</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1-sample">AV1 Sample</a><span>, in § 2.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry">AV1SampleEntry</a><span>, in § 2.2.2</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</a><span>, in § 2.7.2</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#chroma_sample_position">chroma_sample_position</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#chroma_subsampling_x">chroma_subsampling_x</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#chroma_subsampling_y">chroma_subsampling_y</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#cmaf-av1-track">CMAF AV1 Track</a><span>, in § 3</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#compressorname">compressorname</a><span>, in § 2.2.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#config">config</a><span>, in § 2.2.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#configobus">configOBUs</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#fwd_distance">fwd_distance</a><span>, in § 2.5.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#height">height</a><span>, in § 2.2.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#high_bitdepth">high_bitdepth</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_minus_one">initial_presentation_delay_minus_one</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_present">initial_presentation_delay_present</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#marker">marker</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#metadata_specific_parameters">metadata_specific_parameters</a><span>, in § 2.8.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#metadata_type">metadata_type</a><span>, in § 2.8.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#monochrome">monochrome</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#seq_level_idx_0">seq_level_idx_0</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#seq_profile">seq_profile</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#seq_tier_0">seq_tier_0</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#twelve_bit">twelve_bit</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#version">version</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#width">width</a><span>, in § 2.2.4</span>
-  </li></ul>
-  <aside class="dfn-panel" data-for="term-for-page=1">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=1">1. Bitstream features overview</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=1%E2%91%A0">2. Basic Encapsulation Scheme</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=44">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=44">2.3.4. Semantics</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=206">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A3">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A4">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A5">(7)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A6">2.4. AV1 Sample Format</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A7">2.5.2. Description</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A8">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A0%E2%93%AA">2.5.4. Semantics</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=49">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=49">2.3.4. Semantics</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=49%E2%91%A0">2.4. AV1 Sample Format</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=49%E2%91%A1">4.1. General Subsample Encryption constraints</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=71">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A3">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A4">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A5">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A6">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A7">(9)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=13">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A3">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A4">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A5">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A6">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A7">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A8">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0%E2%93%AA">2.7.2. Description</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=13">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A3">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A4">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A5">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A6">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A7">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A8">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0%E2%93%AA">2.7.2. Description</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=13">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A3">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A4">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A5">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A6">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A7">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A8">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0%E2%93%AA">2.7.2. Description</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=206">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A3">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A4">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A5">(7)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A6">2.4. AV1 Sample Format</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A7">2.5.2. Description</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A8">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A0%E2%93%AA">2.5.4. Semantics</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=39">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39">1. Bitstream features overview</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39%E2%91%A0">2.3.4. Semantics</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39%E2%91%A1">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39%E2%91%A2">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=46">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A0">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A1">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A2">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A3">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A4">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A5">2.8.2. Description</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A6">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A7">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A8">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A0%E2%93%AA">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=39">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39">1. Bitstream features overview</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39%E2%91%A0">2.3.4. Semantics</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39%E2%91%A1">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39%E2%91%A2">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=40">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=40">2.3.4. Semantics</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=40%E2%91%A0">4.1. General Subsample Encryption constraints</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=121">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121">1. Bitstream features overview</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121%E2%91%A0">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121%E2%91%A1">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=206">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A3">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A4">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A5">(7)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A6">2.4. AV1 Sample Format</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A7">2.5.2. Description</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A8">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A0%E2%93%AA">2.5.4. Semantics</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=121">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121">1. Bitstream features overview</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121%E2%91%A0">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121%E2%91%A1">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=41">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A2">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A3">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A4">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A5">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A6">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A7">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A8">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%93%AA">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A0">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A1">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A2">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A3">(13)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A4">(14)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A5">(15)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A6">(16)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A7">(17)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A8">(18)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%93%AA">(19)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A0">(20)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A1">(21)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A2">(22)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A3">(23)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A4">(24)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A5">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A6">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A7">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A8">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A2%E2%93%AA">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A2%E2%91%A0">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A2%E2%91%A1">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A2%E2%91%A2">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A2%E2%91%A3">(6)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=13">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A3">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A4">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A5">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A6">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A7">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A8">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0%E2%93%AA">2.7.2. Description</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=46">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A0">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A1">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A2">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A3">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A4">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A5">2.8.2. Description</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A6">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A7">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A8">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A0%E2%93%AA">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=13">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A3">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A4">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A5">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A6">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A7">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A8">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0%E2%93%AA">2.7.2. Description</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=71">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A3">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A4">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A5">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A6">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A7">(9)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=121">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121">1. Bitstream features overview</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121%E2%91%A0">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121%E2%91%A1">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=45">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=45">2.3.4. Semantics</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4. Common Encryption</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(12)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4. Common Encryption</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(12)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4. Common Encryption</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(12)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4. Common Encryption</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(12)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/71975.html#">https://www.iso.org/standard/71975.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">3. CMAF AV1 track format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/71975.html#">https://www.iso.org/standard/71975.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">3. CMAF AV1 track format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://tools.ietf.org/html/rfc6381#">https://tools.ietf.org/html/rfc6381#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">5. Codecs Parameter String</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.webmproject.org/vp9/mp4/#">https://www.webmproject.org/vp9/mp4/#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.webmproject.org/vp9/mp4/#">https://www.webmproject.org/vp9/mp4/#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span class="content">Terms defined by reference</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#index-defined-elsewhere"></a></h3>
+     <li><a href="#valdef-av1sampleentry-av01">value for AV1SampleEntry</a><span>, in § 2.2.1</span>
+     <li><a href="#valdef-isobmff-brand-av01">value for ISOBMFF Brand</a><span>, in § 2.1</span>
+    </ul>
+   <li><a href="#av1c">av1C</a><span>, in § 2.3.1</span>
+   <li><a href="#av1codecconfigurationbox">AV1CodecConfigurationBox</a><span>, in § 2.3.2</span>
+   <li><a href="#av1f">av1f</a><span>, in § 2.5.1</span>
+   <li><a href="#av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</a><span>, in § 2.5.2</span>
+   <li><a href="#valdef-av1metadatasamplegroupentry-av1m">av1M</a><span>, in § 2.8.1</span>
+   <li><a href="#valdef-av1multiframesamplegroupentry-av1m">av1m</a><span>, in § 2.6.1</span>
+   <li><a href="#av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</a><span>, in § 2.8.2</span>
+   <li><a href="#av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</a><span>, in § 2.6.2</span>
+   <li><a href="#av1s">av1s</a><span>, in § 2.7.1</span>
+   <li><a href="#av1-sample">AV1 Sample</a><span>, in § 2.4</span>
+   <li><a href="#av1sampleentry">AV1SampleEntry</a><span>, in § 2.2.2</span>
+   <li><a href="#av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</a><span>, in § 2.7.2</span>
+   <li><a href="#chroma_sample_position">chroma_sample_position</a><span>, in § 2.3.4</span>
+   <li><a href="#chroma_subsampling_x">chroma_subsampling_x</a><span>, in § 2.3.4</span>
+   <li><a href="#chroma_subsampling_y">chroma_subsampling_y</a><span>, in § 2.3.4</span>
+   <li><a href="#cmaf-av1-track">CMAF AV1 Track</a><span>, in § 3</span>
+   <li><a href="#compressorname">compressorname</a><span>, in § 2.2.4</span>
+   <li><a href="#config">config</a><span>, in § 2.2.4</span>
+   <li><a href="#configobus">configOBUs</a><span>, in § 2.3.4</span>
+   <li><a href="#fwd_distance">fwd_distance</a><span>, in § 2.5.4</span>
+   <li><a href="#height">height</a><span>, in § 2.2.4</span>
+   <li><a href="#high_bitdepth">high_bitdepth</a><span>, in § 2.3.4</span>
+   <li><a href="#initial_presentation_delay_minus_one">initial_presentation_delay_minus_one</a><span>, in § 2.3.4</span>
+   <li><a href="#initial_presentation_delay_present">initial_presentation_delay_present</a><span>, in § 2.3.4</span>
+   <li><a href="#marker">marker</a><span>, in § 2.3.4</span>
+   <li><a href="#metadata_specific_parameters">metadata_specific_parameters</a><span>, in § 2.8.4</span>
+   <li><a href="#metadata_type">metadata_type</a><span>, in § 2.8.4</span>
+   <li><a href="#monochrome">monochrome</a><span>, in § 2.3.4</span>
+   <li><a href="#seq_level_idx_0">seq_level_idx_0</a><span>, in § 2.3.4</span>
+   <li><a href="#seq_profile">seq_profile</a><span>, in § 2.3.4</span>
+   <li><a href="#seq_tier_0">seq_tier_0</a><span>, in § 2.3.4</span>
+   <li><a href="#twelve_bit">twelve_bit</a><span>, in § 2.3.4</span>
+   <li><a href="#version">version</a><span>, in § 2.3.4</span>
+   <li><a href="#width">width</a><span>, in § 2.2.4</span>
+  </ul>
+  <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span class="content">Terms defined by reference</span><a class="self-link" href="#index-defined-elsewhere"></a></h3>
   <ul class="index">
    <li>
     <a data-link-type="biblio">[AV1]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="term-for-page=1">av1 bitstream</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2">buffer_removal_time</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=44">color_config</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=206">delayed random access point</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=49">frame header obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=71">frame obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2①">frame_presentation_time</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2②">initial_display_delay_minus_1</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=13">inter frame</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=13①">intra-only frame</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=13②">key frame</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=206①">key frame dependent recovery point</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=39">low overhead bitstream format</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2③">max_frame_height_minus_1</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2④">max_frame_width_minus_1</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=46">metadata obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2⑤">mono_chrome</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=39①">obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=40">obu header</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2⑥">obu_has_size_field</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2⑦">obu_size</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2⑧">open_bitstream_unit</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=121">padding obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=206②">random access point</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=121①">redundant frame header obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2⑨">seq_level_idx</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2①⓪">seq_tier</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=41">sequence header obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2①①">show_existing_frame</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2①②">show_frame</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2①③">subsampling_x</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2①④">subsampling_y</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=13③">switch frame</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=46①">temporal delimiter obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=13④">temporal unit</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=71①">tile group obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=121②">tile list obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=45">timing_info</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2①⑤">timing_info_present_flag</span>
-    </li></ul>
-   </li><li>
+     <li><span class="dfn-paneled" id="0c2ca1d5">av1 bitstream</span>
+     <li><span class="dfn-paneled" id="37e9fb19">buffer_removal_time</span>
+     <li><span class="dfn-paneled" id="b7ca4bf7">color_config</span>
+     <li><span class="dfn-paneled" id="9d45d75d">delayed random access point</span>
+     <li><span class="dfn-paneled" id="c045a352">frame header obu</span>
+     <li><span class="dfn-paneled" id="831a5a65">frame obu</span>
+     <li><span class="dfn-paneled" id="84de3072">frame_presentation_time</span>
+     <li><span class="dfn-paneled" id="81139bb1">initial_display_delay_minus_1</span>
+     <li><span class="dfn-paneled" id="7edceda2">inter frame</span>
+     <li><span class="dfn-paneled" id="6a4d04ef">intra-only frame</span>
+     <li><span class="dfn-paneled" id="95de707d">key frame</span>
+     <li><span class="dfn-paneled" id="83e6755a">key frame dependent recovery point</span>
+     <li><span class="dfn-paneled" id="8b5d0ee2">low overhead bitstream format</span>
+     <li><span class="dfn-paneled" id="3a5737fd">max_frame_height_minus_1</span>
+     <li><span class="dfn-paneled" id="58ec0510">max_frame_width_minus_1</span>
+     <li><span class="dfn-paneled" id="937ec5c0">metadata obu</span>
+     <li><span class="dfn-paneled" id="50388659">mono_chrome</span>
+     <li><span class="dfn-paneled" id="fdf4231e">obu</span>
+     <li><span class="dfn-paneled" id="b4bb1520">obu header</span>
+     <li><span class="dfn-paneled" id="9c2e006a">obu_has_size_field</span>
+     <li><span class="dfn-paneled" id="c19d5874">obu_size</span>
+     <li><span class="dfn-paneled" id="da136fa8">open_bitstream_unit</span>
+     <li><span class="dfn-paneled" id="2181eb6c">padding obu</span>
+     <li><span class="dfn-paneled" id="6406abdb">random access point</span>
+     <li><span class="dfn-paneled" id="f80f4aa7">redundant frame header obu</span>
+     <li><span class="dfn-paneled" id="48d18ec8">seq_level_idx</span>
+     <li><span class="dfn-paneled" id="9aa97c69">seq_tier</span>
+     <li><span class="dfn-paneled" id="56e458b6">sequence header obu</span>
+     <li><span class="dfn-paneled" id="6879641c">show_existing_frame</span>
+     <li><span class="dfn-paneled" id="6f2bb367">show_frame</span>
+     <li><span class="dfn-paneled" id="029d3141">subsampling_x</span>
+     <li><span class="dfn-paneled" id="1a24c071">subsampling_y</span>
+     <li><span class="dfn-paneled" id="0c507a0f">switch frame</span>
+     <li><span class="dfn-paneled" id="0f7ae3ea">temporal delimiter obu</span>
+     <li><span class="dfn-paneled" id="893e1684">temporal unit</span>
+     <li><span class="dfn-paneled" id="7c08a478">tile group obu</span>
+     <li><span class="dfn-paneled" id="da09075b">tile list obu</span>
+     <li><span class="dfn-paneled" id="48bcea1c">timing_info</span>
+     <li><span class="dfn-paneled" id="f6918f92">timing_info_present_flag</span>
+    </ul>
+   <li>
     <a data-link-type="biblio">[CENC]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="term-for-">bytesofcleardata</span>
-     </li><li><span class="dfn-paneled" id="term-for-①">bytesofprotecteddata</span>
-     </li><li><span class="dfn-paneled" id="term-for-②">cbcs</span>
-     </li><li><span class="dfn-paneled" id="term-for-③">cenc</span>
-    </li></ul>
-   </li><li>
+     <li><span class="dfn-paneled" id="08bdf12f">bytesofcleardata</span>
+     <li><span class="dfn-paneled" id="7e1402cf">bytesofprotecteddata</span>
+     <li><span class="dfn-paneled" id="aea95c63">cbcs</span>
+     <li><span class="dfn-paneled" id="8d1f372c">cenc</span>
+    </ul>
+   <li>
     <a data-link-type="biblio">[CMAF]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="term-for-④">cmaf video track</span>
-     </li><li><span class="dfn-paneled" id="term-for-⑤">cmfc</span>
-    </li></ul>
-   </li><li>
+     <li><span class="dfn-paneled" id="ce4f79c4">cmaf video track</span>
+     <li><span class="dfn-paneled" id="8e134714">cmfc</span>
+    </ul>
+   <li>
     <a data-link-type="biblio">[ISOBMFF]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="term-for-⑥">bitr</span>
-     </li><li><span class="dfn-paneled" id="term-for-⑦">clap</span>
-     </li><li><span class="dfn-paneled" id="term-for-⑧">clli</span>
-     </li><li><span class="dfn-paneled" id="term-for-⑨">colr</span>
-     </li><li><span class="dfn-paneled" id="term-for-①⓪">ctts</span>
-     </li><li><span class="dfn-paneled" id="term-for-①①">iso6</span>
-     </li><li><span class="dfn-paneled" id="term-for-①②">mdcv</span>
-     </li><li><span class="dfn-paneled" id="term-for-①③">nclx</span>
-     </li><li><span class="dfn-paneled" id="term-for-①④">visualsampleentry</span>
-    </li></ul>
-   </li><li>
+     <li><span class="dfn-paneled" id="fe72a98d">bitr</span>
+     <li><span class="dfn-paneled" id="d610a6f9">clap</span>
+     <li><span class="dfn-paneled" id="df22dcca">clli</span>
+     <li><span class="dfn-paneled" id="addc5c57">colr</span>
+     <li><span class="dfn-paneled" id="574e11bb">ctts</span>
+     <li><span class="dfn-paneled" id="103b0ad5">iso6</span>
+     <li><span class="dfn-paneled" id="c2257a27">mdcv</span>
+     <li><span class="dfn-paneled" id="80acadec">nclx</span>
+     <li><span class="dfn-paneled" id="62954e09">visualsampleentry</span>
+    </ul>
+   <li>
     <a data-link-type="biblio">[RFC6381]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="term-for-①⑤">codecs</span>
-    </li></ul>
-   </li><li>
-    <a data-link-type="biblio">[vp9]</a> defines the following terms:
+     <li><span class="dfn-paneled" id="05d9bbbb">codecs</span>
+    </ul>
+   <li>
+    <a data-link-type="biblio">[VP9]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="term-for-①⑥">coll</span>
-     </li><li><span class="dfn-paneled" id="term-for-①⑦">smdm</span>
-    </li></ul>
-  </li></ul>
-  <h2 class="no-num no-ref heading settled" id="references"><span class="content">References</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#references"></a></h2>
-  <h3 class="no-num no-ref heading settled" id="normative"><span class="content">Normative References</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#normative"></a></h3>
+     <li><span class="dfn-paneled" id="259a7661">coll</span>
+     <li><span class="dfn-paneled" id="fd8e2db3">smdm</span>
+    </ul>
+  </ul>
+  <h2 class="no-num no-ref heading settled" id="references"><span class="content">References</span><a class="self-link" href="#references"></a></h2>
+  <h3 class="no-num no-ref heading settled" id="normative"><span class="content">Normative References</span><a class="self-link" href="#normative"></a></h3>
   <dl>
    <dt id="biblio-av1">[AV1]
-   </dt><dd><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf"><cite>AV1 Bitstream &amp; Decoding Process Specification</cite></a>. Standard. URL: <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf">https://aomediacodec.github.io/av1-spec/av1-spec.pdf</a>
-   </dd><dt id="biblio-cenc">[CENC]
-   </dt><dd><a href="https://www.iso.org/standard/68042.html"><cite>Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files</cite></a>. Standard. URL: <a href="https://www.iso.org/standard/68042.html">https://www.iso.org/standard/68042.html</a>
-   </dd><dt id="biblio-cmaf">[CMAF]
-   </dt><dd><a href="https://www.iso.org/standard/71975.html"><cite>Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media</cite></a>. Standard. URL: <a href="https://www.iso.org/standard/71975.html">https://www.iso.org/standard/71975.html</a>
-   </dd><dt id="biblio-isobmff">[ISOBMFF]
-   </dt><dd><a href="http://standards.iso.org/ittf/PubliclyAvailableStandards/c068960_ISO_IEC_14496-12_2015.zip"><cite>Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format</cite></a>. December 2015. International Standard. URL: <a href="http://standards.iso.org/ittf/PubliclyAvailableStandards/c068960_ISO_IEC_14496-12_2015.zip">http://standards.iso.org/ittf/PubliclyAvailableStandards/c068960_ISO_IEC_14496-12_2015.zip</a>
-   </dd><dt id="biblio-rfc2119">[RFC2119]
-   </dt><dd>S. Bradner. <a href="https://datatracker.ietf.org/doc/html/rfc2119"><cite>Key words for use in RFCs to Indicate Requirement Levels</cite></a>. March 1997. Best Current Practice. URL: <a href="https://datatracker.ietf.org/doc/html/rfc2119">https://datatracker.ietf.org/doc/html/rfc2119</a>
-   </dd><dt id="biblio-rfc6381">[RFC6381]
-   </dt><dd>R. Gellens; D. Singer; P. Frojdh. <a href="https://www.rfc-editor.org/rfc/rfc6381"><cite>The 'Codecs' and 'Profiles' Parameters for "Bucket" Media Types</cite></a>. August 2011. Proposed Standard. URL: <a href="https://www.rfc-editor.org/rfc/rfc6381">https://www.rfc-editor.org/rfc/rfc6381</a>
-  </dd></dl>
-  <aside class="dfn-panel" data-for="av1sampleentry">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry">#av1sampleentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1sampleentry">2.1. General Requirements &amp; Brands</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1sampleentry%E2%91%A0">2.2.4. Semantics</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1sampleentry%E2%91%A1">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1sampleentry%E2%91%A2">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1sampleentry%E2%91%A3">3. CMAF AV1 track format</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="av1codecconfigurationbox">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox">#av1codecconfigurationbox</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1codecconfigurationbox">2.2.2. Description</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1codecconfigurationbox%E2%91%A0">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1codecconfigurationbox%E2%91%A1">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1codecconfigurationbox%E2%91%A2">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1codecconfigurationbox%E2%91%A3">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1codecconfigurationbox%E2%91%A4">(3)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="high_bitdepth">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#high_bitdepth">#high_bitdepth</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-high_bitdepth">2.3.4. Semantics</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="twelve_bit">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#twelve_bit">#twelve_bit</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-twelve_bit">2.3.4. Semantics</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="chroma_subsampling_x">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#chroma_subsampling_x">#chroma_subsampling_x</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-chroma_subsampling_x">2.3.4. Semantics</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="chroma_subsampling_y">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#chroma_subsampling_y">#chroma_subsampling_y</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-chroma_subsampling_y">2.3.4. Semantics</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="chroma_sample_position">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#chroma_sample_position">#chroma_sample_position</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-chroma_sample_position">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-chroma_sample_position%E2%91%A0">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="initial_presentation_delay_minus_one">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_minus_one">#initial_presentation_delay_minus_one</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-initial_presentation_delay_minus_one">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-initial_presentation_delay_minus_one%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-initial_presentation_delay_minus_one%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-initial_presentation_delay_minus_one%E2%91%A2">(4)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="av1-sample">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1-sample">#av1-sample</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1-sample">2.2.2. Description</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="av1forwardkeyframesamplegroupentry">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1forwardkeyframesamplegroupentry">#av1forwardkeyframesamplegroupentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1forwardkeyframesamplegroupentry">2.3.4. Semantics</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1forwardkeyframesamplegroupentry%E2%91%A0">2.4. AV1 Sample Format</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="av1multiframesamplegroupentry">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1multiframesamplegroupentry">#av1multiframesamplegroupentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1multiframesamplegroupentry">2.4. AV1 Sample Format</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="av1s">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1s">#av1s</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1s">2.4. AV1 Sample Format</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="av1switchframesamplegroupentry">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1switchframesamplegroupentry">#av1switchframesamplegroupentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1switchframesamplegroupentry">2.4. AV1 Sample Format</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="av1metadatasamplegroupentry">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1metadatasamplegroupentry">#av1metadatasamplegroupentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1metadatasamplegroupentry">2.4. AV1 Sample Format</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="cmaf-av1-track">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#cmaf-av1-track">#cmaf-av1-track</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-cmaf-av1-track">3. CMAF AV1 track format</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-cmaf-av1-track%E2%91%A0">4. Common Encryption</a>
-   </li></ul>
-  </aside>
-<script>/* script-dfn-panel */
-
-document.body.addEventListener("click", function(e) {
-    var queryAll = function(sel) { return [].slice.call(document.querySelectorAll(sel)); }
-    // Find the dfn element or panel, if any, that was clicked on.
-    var el = e.target;
-    var target;
-    var hitALink = false;
-    while(el.parentElement) {
-        if(el.tagName == "A") {
-            // Clicking on a link in a <dfn> shouldn't summon the panel
-            hitALink = true;
+   <dd><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf"><cite>AV1 Bitstream &amp; Decoding Process Specification</cite></a>. Standard. URL: <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf">https://aomediacodec.github.io/av1-spec/av1-spec.pdf</a>
+   <dt id="biblio-cenc">[CENC]
+   <dd><a href="https://www.iso.org/standard/68042.html"><cite>Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files</cite></a>. Standard. URL: <a href="https://www.iso.org/standard/68042.html">https://www.iso.org/standard/68042.html</a>
+   <dt id="biblio-cmaf">[CMAF]
+   <dd><a href="https://www.iso.org/standard/71975.html"><cite>Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media</cite></a>. Standard. URL: <a href="https://www.iso.org/standard/71975.html">https://www.iso.org/standard/71975.html</a>
+   <dt id="biblio-isobmff">[ISOBMFF]
+   <dd><a href="http://standards.iso.org/ittf/PubliclyAvailableStandards/c068960_ISO_IEC_14496-12_2015.zip"><cite>Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format</cite></a>. December 2015. International Standard. URL: <a href="http://standards.iso.org/ittf/PubliclyAvailableStandards/c068960_ISO_IEC_14496-12_2015.zip">http://standards.iso.org/ittf/PubliclyAvailableStandards/c068960_ISO_IEC_14496-12_2015.zip</a>
+   <dt id="biblio-rfc2119">[RFC2119]
+   <dd>S. Bradner. <a href="https://datatracker.ietf.org/doc/html/rfc2119"><cite>Key words for use in RFCs to Indicate Requirement Levels</cite></a>. March 1997. Best Current Practice. URL: <a href="https://datatracker.ietf.org/doc/html/rfc2119">https://datatracker.ietf.org/doc/html/rfc2119</a>
+   <dt id="biblio-rfc6381">[RFC6381]
+   <dd>R. Gellens; D. Singer; P. Frojdh. <a href="https://www.rfc-editor.org/rfc/rfc6381"><cite>The 'Codecs' and 'Profiles' Parameters for "Bucket" Media Types</cite></a>. August 2011. Proposed Standard. URL: <a href="https://www.rfc-editor.org/rfc/rfc6381">https://www.rfc-editor.org/rfc/rfc6381</a>
+  </dl>
+<script>/* Boilerplate: script-dfn-panel */
+"use strict";
+{
+    const dfnsJson = window.dfnsJson || {};
+
+    function genDfnPanel({dfnID, url, dfnText, refSections, external}) {
+        return mk.aside({
+            class: "dfn-panel",
+            id: `infopanel-for-${dfnID}`,
+            "data-for": dfnID,
+            "aria-labelled-by":`infopaneltitle-for-${dfnID}`,
+            },
+            mk.span({id:`infopaneltitle-for-${dfnID}`, style:"display:none"},
+                `Info about the '${dfnText}' ${external?"external":""} reference.`),
+            mk.a({href:url}, url),
+            mk.b({}, "Referenced in:"),
+            mk.ul({},
+                ...refSections.map(section=>
+                    mk.li({},
+                        ...section.refs.map((ref, refI)=>
+                            [
+                                mk.a({
+                                    href: `#${ref.id}`
+                                    },
+                                    (refI == 0) ? section.title : `(${refI + 1})`
+                                ),
+                                " ",
+                            ]
+                        ),
+                    ),
+                ),
+            ),
+        );
+    }
+
+    function genAllDfnPanels() {
+        for(const panelData of Object.values(window.dfnpanelData)) {
+            const dfnID = panelData.dfnID;
+            const dfn = document.getElementById(dfnID);
+            if(!dfn) {
+                console.log(`Can't find dfn#${dfnID}.`, panelData);
+            } else {
+                const panel = genDfnPanel(panelData);
+                append(document.body, panel);
+                insertDfnPopupAction(dfn, panel)
+            }
         }
-        if(el.classList.contains("dfn-paneled")) {
-            target = "dfn";
-            break;
+    }
+
+    document.addEventListener("DOMContentLoaded", ()=>{
+        genAllDfnPanels();
+
+        // Add popup behavior to all dfns to show the corresponding dfn-panel.
+        var dfns = queryAll('.dfn-paneled');
+        for(let dfn of dfns) { ; }
+
+        document.body.addEventListener("click", (e) => {
+            // If not handled already, just hide all dfn panels.
+            hideAllDfnPanels();
+        });
+    })
+
+
+    function hideAllDfnPanels() {
+        // Turn off any currently "on" or "activated" panels.
+        queryAll(".dfn-panel.on, .dfn-panel.activated").forEach(el=>hideDfnPanel(el));
+    }
+
+    function showDfnPanel(dfnPanel, dfn) {
+        hideAllDfnPanels(); // Only display one at this time.
+        dfn.setAttribute("aria-expanded", "true");
+        dfnPanel.classList.add("on");
+        dfnPanel.style.left = "5px";
+        dfnPanel.style.top = "0px";
+        const panelRect = dfnPanel.getBoundingClientRect();
+        const panelWidth = panelRect.right - panelRect.left;
+        if (panelRect.right > document.body.scrollWidth) {
+            // Panel's overflowing the screen.
+            // Just drop it below the dfn and flip it rightward instead.
+            // This still wont' fix things if the screen is *really* wide,
+            // but fixing that's a lot harder without 'anchor()'.
+            dfnPanel.style.top = "1.5em";
+            dfnPanel.style.left = "auto";
+            dfnPanel.style.right = "0px";
+        }
+    }
+
+    function pinDfnPanel(dfnPanel) {
+        // Switch it to "activated" state, which pins it.
+        dfnPanel.classList.add("activated");
+        dfnPanel.style.left = null;
+        dfnPanel.style.top = null;
+    }
+
+    function hideDfnPanel(dfnPanel, dfn) {
+        if(!dfn) {
+            dfn = document.getElementById(dfnPanel.getAttribute("data-for"));
         }
-        if(el.classList.contains("dfn-panel")) {
-            target = "dfn-panel";
-            break;
+        dfn.setAttribute("aria-expanded", "false")
+        dfnPanel.classList.remove("on");
+        dfnPanel.classList.remove("activated");
+    }
+
+    function toggleDfnPanel(dfnPanel, dfn) {
+        if(dfnPanel.classList.contains("on")) {
+            hideDfnPanel(dfnPanel, dfn);
+        } else {
+            showDfnPanel(dfnPanel, dfn);
         }
-        el = el.parentElement;
     }
-    if(target != "dfn-panel") {
-        // Turn off any currently "on" or "activated" panels.
-        queryAll(".dfn-panel.on, .dfn-panel.activated").forEach(function(el){
-            el.classList.remove("on");
-            el.classList.remove("activated");
+
+    function insertDfnPopupAction(dfn, dfnPanel) {
+        // Find dfn panel
+        const panelWrapper = document.createElement('span');
+        panelWrapper.appendChild(dfnPanel);
+        panelWrapper.style.position = "relative";
+        panelWrapper.style.height = "0px";
+        dfn.insertAdjacentElement("afterend", panelWrapper);
+        dfn.setAttribute('role', 'button');
+        dfn.setAttribute('aria-expanded', 'false')
+        dfn.tabIndex = 0;
+        dfn.classList.add('has-dfn-panel');
+        dfn.addEventListener('click', (event) => {
+            showDfnPanel(dfnPanel, dfn);
+            event.stopPropagation();
+        });
+        dfn.addEventListener('keypress', (event) => {
+            const kc = event.keyCode;
+            // 32->Space, 13->Enter
+            if(kc == 32 || kc == 13) {
+                toggleDfnPanel(dfnPanel, dfn);
+                event.stopPropagation();
+                event.preventDefault();
+            }
         });
+
+        dfnPanel.addEventListener('click', (event) => {
+            if (event.target.nodeName == 'A') {
+                pinDfnPanel(dfnPanel);
+            }
+            event.stopPropagation();
+        });
+
+        dfnPanel.addEventListener('keydown', (event) => {
+            if(event.keyCode == 27) { // Escape key
+                hideDfnPanel(dfnPanel, dfn);
+                event.stopPropagation();
+                event.preventDefault();
+            }
+        })
+    }
+}
+</script>
+<script>/* Boilerplate: script-dfn-panel */
+"use strict";
+{
+    const dfnsJson = window.dfnsJson || {};
+
+    function genDfnPanel({dfnID, url, dfnText, refSections, external}) {
+        return mk.aside({
+            class: "dfn-panel",
+            id: `infopanel-for-${dfnID}`,
+            "data-for": dfnID,
+            "aria-labelled-by":`infopaneltitle-for-${dfnID}`,
+            },
+            mk.span({id:`infopaneltitle-for-${dfnID}`, style:"display:none"},
+                `Info about the '${dfnText}' ${external?"external":""} reference.`),
+            mk.a({href:url}, url),
+            mk.b({}, "Referenced in:"),
+            mk.ul({},
+                ...refSections.map(section=>
+                    mk.li({},
+                        ...section.refs.map((ref, refI)=>
+                            [
+                                mk.a({
+                                    href: `#${ref.id}`
+                                    },
+                                    (refI == 0) ? section.title : `(${refI + 1})`
+                                ),
+                                " ",
+                            ]
+                        ),
+                    ),
+                ),
+            ),
+        );
     }
-    if(target == "dfn" && !hitALink) {
-        // open the panel
-        var dfnPanel = document.querySelector(".dfn-panel[data-for='" + el.id + "']");
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-                // Reposition, because the panel is overflowing
-                dfnPanel.style.left = window.scrollX + rect.left - (panelWidth + 5) + "px";
+
+    function genAllDfnPanels() {
+        for(const panelData of Object.values(window.dfnpanelData)) {
+            const dfnID = panelData.dfnID;
+            const dfn = document.getElementById(dfnID);
+            if(!dfn) {
+                console.log(`Can't find dfn#${dfnID}.`, panelData);
+            } else {
+                const panel = genDfnPanel(panelData);
+                append(document.body, panel);
+                insertDfnPopupAction(dfn, panel)
             }
-        } else {
-            console.log("Couldn't find .dfn-panel[data-for='" + el.id + "']");
         }
-    } else if(target == "dfn-panel") {
+    }
+
+    document.addEventListener("DOMContentLoaded", ()=>{
+        genAllDfnPanels();
+
+        // Add popup behavior to all dfns to show the corresponding dfn-panel.
+        var dfns = queryAll('.dfn-paneled');
+        for(let dfn of dfns) { ; }
+
+        document.body.addEventListener("click", (e) => {
+            // If not handled already, just hide all dfn panels.
+            hideAllDfnPanels();
+        });
+    })
+
+
+    function hideAllDfnPanels() {
+        // Turn off any currently "on" or "activated" panels.
+        queryAll(".dfn-panel.on, .dfn-panel.activated").forEach(el=>hideDfnPanel(el));
+    }
+
+    function showDfnPanel(dfnPanel, dfn) {
+        hideAllDfnPanels(); // Only display one at this time.
+        dfn.setAttribute("aria-expanded", "true");
+        dfnPanel.classList.add("on");
+        dfnPanel.style.left = "5px";
+        dfnPanel.style.top = "0px";
+        const panelRect = dfnPanel.getBoundingClientRect();
+        const panelWidth = panelRect.right - panelRect.left;
+        if (panelRect.right > document.body.scrollWidth) {
+            // Panel's overflowing the screen.
+            // Just drop it below the dfn and flip it rightward instead.
+            // This still wont' fix things if the screen is *really* wide,
+            // but fixing that's a lot harder without 'anchor()'.
+            dfnPanel.style.top = "1.5em";
+            dfnPanel.style.left = "auto";
+            dfnPanel.style.right = "0px";
+        }
+    }
+
+    function pinDfnPanel(dfnPanel) {
         // Switch it to "activated" state, which pins it.
-        el.classList.add("activated");
-        el.style.left = null;
-        el.style.top = null;
+        dfnPanel.classList.add("activated");
+        dfnPanel.style.left = null;
+        dfnPanel.style.top = null;
+    }
+
+    function hideDfnPanel(dfnPanel, dfn) {
+        if(!dfn) {
+            dfn = document.getElementById(dfnPanel.getAttribute("data-for"));
+        }
+        dfn.setAttribute("aria-expanded", "false")
+        dfnPanel.classList.remove("on");
+        dfnPanel.classList.remove("activated");
     }
 
+    function toggleDfnPanel(dfnPanel, dfn) {
+        if(dfnPanel.classList.contains("on")) {
+            hideDfnPanel(dfnPanel, dfn);
+        } else {
+            showDfnPanel(dfnPanel, dfn);
+        }
+    }
+
+    function insertDfnPopupAction(dfn, dfnPanel) {
+        // Find dfn panel
+        const panelWrapper = document.createElement('span');
+        panelWrapper.appendChild(dfnPanel);
+        panelWrapper.style.position = "relative";
+        panelWrapper.style.height = "0px";
+        dfn.insertAdjacentElement("afterend", panelWrapper);
+        dfn.setAttribute('role', 'button');
+        dfn.setAttribute('aria-expanded', 'false')
+        dfn.tabIndex = 0;
+        dfn.classList.add('has-dfn-panel');
+        dfn.addEventListener('click', (event) => {
+            showDfnPanel(dfnPanel, dfn);
+            event.stopPropagation();
+        });
+        dfn.addEventListener('keypress', (event) => {
+            const kc = event.keyCode;
+            // 32->Space, 13->Enter
+            if(kc == 32 || kc == 13) {
+                toggleDfnPanel(dfnPanel, dfn);
+                event.stopPropagation();
+                event.preventDefault();
+            }
+        });
+
+        dfnPanel.addEventListener('click', (event) => {
+            if (event.target.nodeName == 'A') {
+                pinDfnPanel(dfnPanel);
+            }
+            event.stopPropagation();
+        });
+
+        dfnPanel.addEventListener('keydown', (event) => {
+            if(event.keyCode == 27) { // Escape key
+                hideDfnPanel(dfnPanel, dfn);
+                event.stopPropagation();
+                event.preventDefault();
+            }
+        })
+    }
+}
+</script>
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+window.dfnpanelData['av1forwardkeyframesamplegroupentry'] = {"dfnID": "av1forwardkeyframesamplegroupentry", "url": "#av1forwardkeyframesamplegroupentry", "dfnText": "AV1ForwardKeyFrameSampleGroupEntry", "refSections": [{"refs": [{"id": "ref-for-av1forwardkeyframesamplegroupentry"}], "title": "2.3.4. Semantics"}, {"refs": [{"id": "ref-for-av1forwardkeyframesamplegroupentry\u2460"}], "title": "2.4. AV1 Sample Format"}], "external": false};
+window.dfnpanelData['av1multiframesamplegroupentry'] = {"dfnID": "av1multiframesamplegroupentry", "url": "#av1multiframesamplegroupentry", "dfnText": "AV1MultiFrameSampleGroupEntry", "refSections": [{"refs": [{"id": "ref-for-av1multiframesamplegroupentry"}], "title": "2.4. AV1 Sample Format"}], "external": false};
+window.dfnpanelData['av1s'] = {"dfnID": "av1s", "url": "#av1s", "dfnText": "av1s", "refSections": [{"refs": [{"id": "ref-for-av1s"}], "title": "2.4. AV1 Sample Format"}], "external": false};
+window.dfnpanelData['av1switchframesamplegroupentry'] = {"dfnID": "av1switchframesamplegroupentry", "url": "#av1switchframesamplegroupentry", "dfnText": "AV1SwitchFrameSampleGroupEntry", "refSections": [{"refs": [{"id": "ref-for-av1switchframesamplegroupentry"}], "title": "2.4. AV1 Sample Format"}], "external": false};
+window.dfnpanelData['av1metadatasamplegroupentry'] = {"dfnID": "av1metadatasamplegroupentry", "url": "#av1metadatasamplegroupentry", "dfnText": "AV1MetadataSampleGroupEntry", "refSections": [{"refs": [{"id": "ref-for-av1metadatasamplegroupentry"}], "title": "2.4. AV1 Sample Format"}], "external": false};
+window.dfnpanelData['cmaf-av1-track'] = {"dfnID": "cmaf-av1-track", "url": "#cmaf-av1-track", "dfnText": "CMAF AV1 Track", "refSections": [{"refs": [{"id": "ref-for-cmaf-av1-track"}], "title": "3. CMAF AV1 track format"}, {"refs": [{"id": "ref-for-cmaf-av1-track\u2460"}], "title": "4. Common Encryption"}], "external": false};
+</script>
+<script>/* Boilerplate: script-dom-helper */
+function query(sel) { return document.querySelector(sel); }
+
+function queryAll(sel) { return [...document.querySelectorAll(sel)]; }
+
+function iter(obj) {
+	if(!obj) return [];
+	var it = obj[Symbol.iterator];
+	if(it) return it;
+	return Object.entries(obj);
+}
+
+function mk(tagname, attrs, ...children) {
+	const el = document.createElement(tagname);
+	for(const [k,v] of iter(attrs)) {
+		if(k.slice(0,3) == "_on") {
+			const eventName = k.slice(3);
+			el.addEventListener(eventName, v);
+		} else if(k[0] == "_") {
+			// property, not attribute
+			el[k.slice(1)] = v;
+		} else {
+			if(v === false || v == null) {
+        continue;
+      } else if(v === true) {
+        el.setAttribute(k, "");
+        continue;
+      } else {
+  			el.setAttribute(k, v);
+      }
+		}
+	}
+	append(el, children);
+	return el;
+}
+
+/* Create shortcuts for every known HTML element */
+[
+  "a",
+  "abbr",
+  "acronym",
+  "address",
+  "applet",
+  "area",
+  "article",
+  "aside",
+  "audio",
+  "b",
+  "base",
+  "basefont",
+  "bdo",
+  "big",
+  "blockquote",
+  "body",
+  "br",
+  "button",
+  "canvas",
+  "caption",
+  "center",
+  "cite",
+  "code",
+  "col",
+  "colgroup",
+  "datalist",
+  "dd",
+  "del",
+  "details",
+  "dfn",
+  "dialog",
+  "div",
+  "dl",
+  "dt",
+  "em",
+  "embed",
+  "fieldset",
+  "figcaption",
+  "figure",
+  "font",
+  "footer",
+  "form",
+  "frame",
+  "frameset",
+  "head",
+  "header",
+  "h1",
+  "h2",
+  "h3",
+  "h4",
+  "h5",
+  "h6",
+  "hr",
+  "html",
+  "i",
+  "iframe",
+  "img",
+  "input",
+  "ins",
+  "kbd",
+  "label",
+  "legend",
+  "li",
+  "link",
+  "main",
+  "map",
+  "mark",
+  "meta",
+  "meter",
+  "nav",
+  "nobr",
+  "noscript",
+  "object",
+  "ol",
+  "optgroup",
+  "option",
+  "output",
+  "p",
+  "param",
+  "pre",
+  "progress",
+  "q",
+  "s",
+  "samp",
+  "script",
+  "section",
+  "select",
+  "small",
+  "source",
+  "span",
+  "strike",
+  "strong",
+  "style",
+  "sub",
+  "summary",
+  "sup",
+  "table",
+  "tbody",
+  "td",
+  "template",
+  "textarea",
+  "tfoot",
+  "th",
+  "thead",
+  "time",
+  "title",
+  "tr",
+  "u",
+  "ul",
+  "var",
+  "video",
+  "wbr",
+  "xmp",
+].forEach(tagname=>{
+	mk[tagname] = (...args) => mk(tagname, ...args);
 });
-</script></body></html>
\ No newline at end of file
+
+function* nodesFromChildList(children) {
+	for(const child of children.flat(Infinity)) {
+		if(child instanceof Node) {
+			yield child;
+		} else {
+			yield new Text(child);
+		}
+	}
+}
+function append(el, ...children) {
+	for(const child of nodesFromChildList(children)) {
+		if(el instanceof Node) el.appendChild(child);
+		else el.push(child);
+	}
+	return el;
+}
+
+function insertAfter(el, ...children) {
+	for(const child of nodesFromChildList(children)) {
+		el.parentNode.insertBefore(child, el.nextSibling);
+	}
+	return el;
+}
+
+function clearContents(el) {
+	el.innerHTML = "";
+	return el;
+}
+
+function parseHTML(markup) {
+	if(markup.toLowerCase().trim().indexOf('<!doctype') === 0) {
+		const doc = document.implementation.createHTMLDocument("");
+		doc.documentElement.innerHTML = markup;
+		return doc;
+	} else {
+		const el = mk.template({});
+		el.innerHTML = markup;
+		return el.content;
+	}
+}
+</script>
\ No newline at end of file

From 3cf8fa801665d96b5564cef8ec515ebba4a2c50c Mon Sep 17 00:00:00 2001
From: Dimitri Podborski <podborski@users.noreply.github.com>
Date: Mon, 2 Oct 2023 09:26:39 -0700
Subject: [PATCH 06/12] run bikeshed 3.11.21 on v120

index120_init.bs: initial BS file for v120
v120_init.html: compiled index120_init.bs
v120_main.html: currently published v120
v1.2.0.html: compiled modified index120_init.bs (with assert ids)
---
 index120_init.bs |  650 +++++++++
 v1.2.0.html      | 1658 +++++++++++-----------
 v120_init.html   | 3430 ++++++++++++++++++++++++++++++++++++++++++++++
 v120_main.html   | 3368 +++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 8311 insertions(+), 795 deletions(-)
 create mode 100644 index120_init.bs
 create mode 100644 v120_init.html
 create mode 100644 v120_main.html

diff --git a/index120_init.bs b/index120_init.bs
new file mode 100644
index 0000000..231dc4f
--- /dev/null
+++ b/index120_init.bs
@@ -0,0 +1,650 @@
+<pre class='metadata'>
+Title: AV1 Codec ISO Media File Format Binding
+Text Macro: SPECVERSION v1.2.0
+Status: FD
+URL: https://aomediacodec.github.io/av1-isobmff/
+Shortname: av1-isobmff
+Editor: Cyril Concolato, Netflix, cconcolato@netflix.com
+Editor: Tom Finegan, Google, tom.finegan@google.com
+Abstract: This document specifies the storage format for [[!AV1]] bitstreams in [[!ISOBMFF]] tracks as well as in [[!CMAF]] files.
+Date: 2019-12-12
+Repository: AOMediaCodec/av1-isobmff
+Group: AOM
+
+!Previously approved version: <a href="v1.1.0.html">v1.1.0</a>
+</pre>
+
+<pre class="anchors">
+url: https://www.iso.org/standard/68960.html#; spec: ISOBMFF; type: dfn;
+	text: VisualSampleEntry
+
+url: https://www.iso.org/standard/68960.html#; spec: ISOBMFF; type: property;
+	text: bitr
+	text: clap
+	text: clli
+	text: colr
+	text: ctts
+	text: iso6
+	text: mdcv
+	text: nclx
+	text: pasp
+	text: sgpd
+	text: stsd
+
+url: https://www.webmproject.org/vp9/mp4/#; spec: VP9; type: property;
+	text: SmDm
+	text: CoLL
+
+url: https://tools.ietf.org/html/rfc6381#; spec: RFC6381; type: property;
+	text: codecs
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1; spec: AV1; type: dfn;
+	text: AV1 bitstream
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39; spec: AV1; type: dfn;
+	text: OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40; spec: AV1; type: dfn;
+	text: OBU Header
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49; spec: AV1; type: dfn;
+	text: Frame Header OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41; spec: AV1; type: dfn;
+	text: Sequence Header OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46; spec: AV1; type: dfn;
+	text: Temporal Delimiter OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71; spec: AV1; type: dfn;
+	text: Tile Group OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71; spec: AV1; type: dfn;
+	text: Frame OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121; spec: AV1; type: dfn;
+	text: Tile List OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46; spec: AV1; type: dfn;
+	text: Metadata OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121; spec: AV1; type: dfn;
+	text: Redundant Frame Header OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121; spec: AV1; type: dfn;
+	text: Padding OBU
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206; spec: AV1; type: dfn;
+	text: Random Access Point
+	text: Delayed Random Access Point
+	text: Key Frame Dependent Recovery Point
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13; spec: AV1; type: dfn
+	text: Inter Frame
+	text: Intra-only Frame
+	text: Key Frame
+	text: Switch Frame
+	text: Temporal Unit
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39; spec: AV1; type: dfn
+	text: Low Overhead Bitstream Format
+
+url: https://www.iso.org/standard/71975.html#; spec: CMAF; type: dfn;
+	text: CMAF Video Track
+	text: cmfc
+
+url: https://www.iso.org/standard/68042.html#; spec: CENC; type: dfn;
+	text: BytesOfProtectedData
+	text: BytesOfClearData
+	text: cbcs
+	text: cenc
+	text: cbc1
+	text: cens
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45; spec: AV1; type: dfn
+	text: timing_info
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44; spec: AV1; type: dfn
+	text: color_config
+
+url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2; spec: AV1; type: dfn;
+	text: buffer_removal_time
+	text: byte_alignment
+	text: frame_presentation_time
+	text: high_bitdepth
+	text: initial_display_delay_minus_1
+	text: max_frame_height_minus_1
+	text: max_frame_width_minus_1
+	text: mono_chrome
+	text: obu_has_size_field
+	text: obu_size
+	text: open_bitstream_unit
+	text: seq_level_idx
+	text: seq_profile
+	text: seq_tier
+	text: show_existing_frame
+	text: show_frame
+	text: still_picture
+	text: subsampling_x
+	text: subsampling_y
+	text: timing_info_present_flag
+	text: twelve_bit
+</pre>
+
+<pre class='biblio'>
+{
+	"AV1": {
+		"href": "https://aomediacodec.github.io/av1-spec/av1-spec.pdf",
+		"title": "AV1 Bitstream & Decoding Process Specification",
+		"status": "Standard",
+		"publisher": "AOM"
+	},
+	"CMAF": {
+		"title": "Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media",
+		"status": "Standard",
+		"publisher": "ISO",
+		"href": "https://www.iso.org/standard/71975.html"
+	},
+	"CENC": {
+		"title": "Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files",
+		"status": "Standard",
+		"publisher": "ISO",
+		"href": "https://www.iso.org/standard/68042.html"
+	}
+}
+</pre>
+
+Bitstream features overview {#bitstream-overview}
+=================================================
+An [=AV1 bitstream=] is composed of a sequence of [=OBUs=], grouped into [=Temporal Units=].
+
+OBUs are made of a 1 or 2 bytes header, identifying in particular the type of OBU, followed by an optional length field and by an optional payload, whose presence and content depend on the OBU type. Depending on its type, an OBU can carry configuration information, metadata, or coded video data.
+
+NOTE: [=Tile List OBUs=] defined in the [[!AV1]] specification are not supported in the current version of this specification. A future version of the specification may do so.
+
+Temporal Units are processed by a decoder in the order given by the bitstream. Each Temporal Unit is associated with a presentation time. Some Temporal Units may contain multiple frames to be decoded but only one is presented.
+
+NOTE: The AV1 specification defines scalability features, allowing frames from multiple layers or operating points to be present in a single temporal unit. This version of storage in ISOBMFF supports the simple storage of scalable streams in a single track, but does not specify advanced tools for handling multi-track support, layer extraction, or other scalability related use cases. A future version of the specification may do so.
+
+Frames carried in Temporal Units may have coding dependencies on frames carried previously in the same Temporal Unit or in previous Temporal Units. Frames that can be decoded without dependencies to previous frames are of two categories: [=Key Frames=] and [=Intra-only Frames=]. Frames that cannot be decoded independently are of three categories: [=Inter Frames=], [=Switch Frames=], and frames with a [=show_existing_frame=] flag set to 1.
+
+Key Frames with the [=show_frame=] flag set to 1 have the additional property that after decoding the Key Frame, all frames following the Key Frame in the bitstream can be decoded. They are called [=Random Access Points=] in [[!AV1]].
+
+Key Frames with the [=show_frame=] flag set to 0 are called [=Delayed Random Access Points=]. [=Delayed Random Access Points=] have the additional property that if a future [=Key Frame Dependent Recovery Point=] exists, all frames following that [=Key Frame Dependent Recovery Point=] can be decoded. A [=Key Frame Dependent Recovery Point=] is a frame with [=show_existing_frame=] set to 1 that refers to a previous [=Delayed Random Access Points=].
+
+Basic Encapsulation Scheme {#basic-encapsulation}
+=================================================
+
+This section describes the basic data structures used to signal encapsulation of [=AV1 bitstreams=] in [[!ISOBMFF]] containers.
+
+General Requirements & Brands {#brands}
+-----------------------------
+
+A file conformant to this specification satisfies the following:
+- It SHALL conform to the normative requirements of [[!ISOBMFF]]
+- It SHALL have the <dfn value export for="ISOBMFF Brand">av01</dfn> brand among the compatible brands array of the FileTypeBox
+- It SHALL contain at least one track using an [=AV1SampleEntry=]
+- It SHOULD indicate a structural ISOBMFF brand among the compatible brands array of the FileTypeBox, such as 'iso6'
+- It MAY indicate CMAF brands as specified in [[#cmaf]]
+- It MAY indicate other brands not specified in this document provided that the associated requirements do not conflict with those given in this specification
+
+Parsers SHALL support the structures required by the <code>'iso6'</code> brand and MAY support structures required by further ISOBMFF structural brands.
+
+AV1 Sample Entry {#av1sampleentry-section}
+----------------------------------
+
+### Definition ### {#av1sampleentry-definition}
+
+<pre class="def">
+	Sample Entry Type: <dfn value export for="AV1SampleEntry">av01</dfn>
+	Container:         Sample Description Box ('stsd')
+	Mandatory:         Yes
+	Quantity:          One or more.
+</pre>
+
+### Description ### {#av1sampleentry-description}
+
+The <dfn>AV1SampleEntry</dfn> sample entry identifies that the track contains [=AV1 Samples=], and uses an [=AV1CodecConfigurationBox=].
+
+### Syntax ### {#av1sampleentry-syntax}
+
+```
+class AV1SampleEntry extends VisualSampleEntry('av01') {
+  AV1CodecConfigurationBox config;
+}
+```
+
+### Semantics ### {#av1sampleentry-semantics}
+
+The <dfn noexport>width</dfn> and <dfn noexport>height</dfn> fields of the [=VisualSampleEntry=] SHALL equal the values of [=max_frame_width_minus_1=] + 1 and [=max_frame_height_minus_1=] + 1 of the [=Sequence Header OBU=] applying to the samples associated with this sample entry.
+
+The width and height in the TrackHeaderBox SHOULD equal, respectively, the maximum RenderWidth, called MaxRenderWidth, and the maximum RenderHeight, called MaxRenderHeight, of all the frames associated with this sample entry. Additionally, if MaxRenderWidth and MaxRenderHeight values do not equal respectively the [=max_frame_width_minus_1=] + 1 and [=max_frame_height_minus_1=] + 1 values of the [=Sequence Header OBU=], a PixelAspectRatioBox box SHALL be present in the sample entry and set such that
+```
+hSpacing / vSpacing = MaxRenderWidth * (max_frame_height_minus_1 + 1) /
+                              ((max_frame_width_minus_1 + 1) * MaxRenderHeight)
+```
+
+The <dfn noexport>compressorname</dfn> field of the [=VisualSampleEntry=] is an informative name. It is formatted in a fixed 32-byte field, with the first byte set to the number of bytes to be displayed, followed by that number of bytes of displayable data, followed by padding to complete 32 bytes total (including the size byte). The value "\012AOM Coding" is RECOMMENDED; the first byte is a count of the remaining bytes, here represented by \012, which (being octal 12) is decimal 10, the number of bytes in the rest of the string.
+
+NOTE: Parsers may ignore the value of the compressorname field. It is specified in this document simply for legacy and backwards compatibility reasons.
+
+The <dfn noexport>config</dfn> field SHALL contain an [=AV1CodecConfigurationBox=] that applies to the samples associated with this sample entry.
+
+NOTE: Multiple instances of [=AV1SampleEntry=] may be required when the track contains samples requiring a [=AV1CodecConfigurationBox=] with different characteristics.
+
+Optional boxes not specifically mentioned here can be present, in particular those indicated in the definition of the [=VisualSampleEntry=] in [[ISOBMFF]].
+
+AV1 Codec Configuration Box {#av1codecconfigurationbox-section}
+--------------------------------------------------------
+
+### Definition ### {#av1codecconfigurationbox-definition}
+
+<pre class="def">
+	Box Type:  <dfn export>av1C</dfn>
+	Container: AV1 Sample Entry ('av01')
+	Mandatory: Yes
+	Quantity:  Exactly One
+</pre>
+
+
+### Description ### {#av1codecconfigurationbox-description}
+
+The <dfn>AV1CodecConfigurationBox</dfn> contains decoder configuration information that SHALL be valid for every sample that references the sample entry.
+
+
+### Syntax ### {#av1codecconfigurationbox-syntax}
+
+```
+class AV1CodecConfigurationBox extends Box('av1C'){
+  AV1CodecConfigurationRecord av1Config;
+}
+
+aligned (8) class AV1CodecConfigurationRecord {
+  unsigned int (1) marker = 1;
+  unsigned int (7) version = 1;
+  unsigned int (3) seq_profile;
+  unsigned int (5) seq_level_idx_0;
+  unsigned int (1) seq_tier_0;
+  unsigned int (1) high_bitdepth;
+  unsigned int (1) twelve_bit;
+  unsigned int (1) monochrome;
+  unsigned int (1) chroma_subsampling_x;
+  unsigned int (1) chroma_subsampling_y;
+  unsigned int (2) chroma_sample_position;
+  unsigned int (3) reserved = 0;
+
+  unsigned int (1) initial_presentation_delay_present;
+  if (initial_presentation_delay_present) {
+    unsigned int (4) initial_presentation_delay_minus_one;
+  } else {
+    unsigned int (4) reserved = 0;
+  }
+
+  unsigned int (8)[] configOBUs;
+}
+```
+
+### Semantics ### {#av1codecconfigurationbox-semantics}
+
+The <dfn export>marker</dfn> field SHALL be set to 1.
+
+NOTE: The marker bit ensures that the bit pattern of the first byte of the AV1CodecConfigurationRecord cannot be mistaken for an [=OBU Header=] byte.
+
+The <dfn noexport>version</dfn> field indicates the version of the AV1CodecConfigurationRecord. The value SHALL be set to 1 for AV1CodecConfigurationRecord.
+
+The <dfn export>seq_profile</dfn> field indicates the AV1 profile and SHALL be equal to the seq_profile value from the [=Sequence Header OBU=].
+
+The <dfn export>seq_level_idx_0</dfn> field indicates the value of seq_level_idx[0] found in the [=Sequence Header OBU=] and SHALL be equal to the value of seq_level_idx[0] in the [=Sequence Header OBU=].
+
+The <dfn export>seq_tier_0</dfn> field indicates the value of seq_tier[0] found in the [=Sequence Header OBU=] and SHALL be equal to the value of seq_tier[0] in the [=Sequence Header OBU=].
+
+The <dfn export>high_bitdepth</dfn> field indicates the value of the [=high_bitdepth=] flag from the [=Sequence Header OBU=].
+
+The <dfn export>twelve_bit</dfn> field indicates the value of the [=twelve_bit=] flag from the [=Sequence Header OBU=]. When twelve_bit is not present in the [=Sequence Header OBU=] the AV1CodecConfigurationRecord twelve_bit value SHALL be 0.
+
+The <dfn export>monochrome</dfn> field indicates the value of the [=mono_chrome=] flag from the [=Sequence Header OBU=].
+
+The <dfn export>chroma_subsampling_x</dfn> field indicates the [=subsampling_x=] value from the [=Sequence Header OBU=].
+
+The <dfn export>chroma_subsampling_y</dfn> field indicates the [=subsampling_y=] value from the [=Sequence Header OBU=].
+
+The <dfn export>chroma_sample_position</dfn> field indicates the [=chroma_sample_position=] value from the [=Sequence Header OBU=].
+
+When not specified in the [=Sequence Header OBU=], and not defined by the conditions specified in the [[!AV1]] [=color_config=], the values of [=chroma_subsampling_x=], [=chroma_subsampling_y=], and [=chroma_sample_position=] SHALL be 0.
+
+The <dfn export>initial_presentation_delay_present</dfn> field indicates the presence of the initial_presentation_delay_minus_one field.
+
+The <dfn>initial_presentation_delay_minus_one</dfn> field indicates the number of samples (minus one) that need to be decoded prior to starting the presentation of the first sample associated with this sample entry in order to guarantee that each sample will be decoded prior to its presentation time under the constraints of the first level value indicated by [=seq_level_idx=] in the [=Sequence Header OBU=] (in the configOBUs field or in the associated samples). More precisely, the following procedure SHALL not return any error:
+- construct a hypothetical bitstream consisting of the OBUs carried in the sample entry followed by the OBUs carried in all the samples referring to that sample entry,
+- set the first [=initial_display_delay_minus_1=] field of each [=Sequence Header OBU=] to the number of frames minus one contained in the first [=initial_presentation_delay_minus_one=] + 1 samples,
+- set the [=frame_presentation_time=] field of the frame header of each presentable frame such that it matches the presentation time difference between the sample carrying this frame and the previous sample (if it exists, 0 otherwise),
+- apply the decoder model specified in [[!AV1]] to this hypothetical bitstream using the first operating point. If <code>buffer_removal_time</code> information is present in bitstream for this operating point, the decoding schedule mode SHALL be applied, otherwise the resource availability mode SHALL be applied.
+
+NOTE: With the above procedure, when smooth presentation can be guaranteed after decoding the first sample, initial_presentation_delay_minus_one is 0.
+
+NOTE: Because the above procedure considers all OBUs in all samples associated with a sample entry, if these OBUS form multiple coded video sequences which would have different values of <code>initial_presentation_delay_minus_one</code> if considered separately, the sample entry would signal the larger value.
+
+<div class=example>
+The difference between [=initial_presentation_delay_minus_one=] and [=initial_display_delay_minus_1=] can be illustrated by considering the following example:
+```
+a b c d e f g h
+```
+where letters correspond to frames. Assume that <code>[=initial_display_delay_minus_1=]</code> is 2, i.e. that once frame <code>c</code> has been decoded, all other frames in the bitstream can be presented on time. If those frames were grouped into temporal units and samples as follows:
+```
+[a] [b c d] [e] [f] [g] [h]
+```
+<code>[=initial_presentation_delay_minus_one=]</code> would be 1 because it takes presentation of 2 samples to ensure that <code>c</code> is decoded.
+But if the frames were grouped as follows:
+```
+[a] [b] [c] [d e f] [g] [h]
+```
+<code>[=initial_presentation_delay_minus_one=]</code> would be 2 because it takes presentation of 3 samples to ensure that <code>c</code> is decoded.
+</div>
+
+The <dfn export>configOBUs</dfn> field contains zero or more OBUs. Any OBU may be present provided that the following procedures produce compliant AV1 bitstreams:
+- From any sync sample, an AV1 bitstream is formed by first outputting the OBUs contained in the [=AV1CodecConfigurationBox=] and then by outputing all OBUs in the samples themselves, in order, starting from the sync sample.
+- From any sample marked with the [=AV1ForwardKeyFrameSampleGroupEntry=], an AV1 bitstream is formed by first outputting the OBUs contained in the [=AV1CodecConfigurationBox=] and then by outputing all OBUs in the sample itself, then by outputting all OBUs in the samples, in order, starting from the sample at the distance indicated by the sample group.
+
+Additionally, the configOBUs field SHALL contain at most one [=Sequence Header OBU=] and if present, it SHALL be the first OBU.
+
+NOTE: The configOBUs field is expected to contain only one [=Sequence Header OBU=] and zero or more [=Metadata OBUs=] when applicable to all the associated samples.
+
+OBUs stored in the configOBUs field follow the [=open_bitstream_unit=] [=Low Overhead Bitstream Format=] syntax as specified in [[!AV1]]. The flag [=obu_has_size_field=] SHALL be set to 1, indicating that the size of the OBU payload follows the header, and that it is coded using LEB128.
+
+When a [=Sequence Header OBU=] is contained within the configOBUs of the AV1CodecConfigurationRecord, the values present in the [=Sequence Header OBU=] contained within configOBUs SHALL match the values of the AV1CodecConfigurationRecord.
+
+The presentation times of AV1 samples are given by the ISOBMFF structures. The [=timing_info_present_flag=] in the [=Sequence Header OBU=] (in the configOBUs field or in the associated samples) SHOULD be set to 0. If set to 1, the [=timing_info=] structure of the [=Sequence Header OBU=], the [=frame_presentation_time=] and [=buffer_removal_time=] fields of the [=Frame Header OBUs=], if present, SHALL be ignored for the purpose of timed processing of the ISOBMFF file.
+
+The sample entry SHOULD contain a 'colr' box with a colour_type set to 'nclx'. If present, the values of colour_primaries, transfer_characteristics, and matrix_coefficients SHALL match the values given in the [=Sequence Header OBU=] (in the configOBUs field or in the associated samples) if the color_description_present_flag is set to 1. Similarly, the full_range_flag in the 'colr' box shall match the color_range flag in the [=Sequence Header OBU=]. When configOBUs does not contain a [=Sequence Header OBU=], this box with colour_type set to 'nclx' SHALL be present.
+
+The CleanApertureBox 'clap' SHOULD not be present.
+
+For sample entries corresponding to HDR content, the MasteringDisplayColourVolumeBox 'mdcv' and ContentLightLevelBox 'clli' SHOULD be present, and their values SHALL match the values of contained in the [=Metadata OBUs=] of type METADATA_TYPE_HDR_CLL and METADATA_TYPE_HDR_MDCV, if present (in the configOBUs or in the samples).
+
+NOTE: The MasteringDisplayColourVolumeBox 'mdcv' and ContentLightLevelBox 'clli' have identical syntax to the SMPTE2086MasteringDisplayMetadataBox 'SmDm' and ContentLightLevelBox 'CoLL', except that they are of type <code>Box</code> and not <code>FullBox</code>. However, the semantics of the MasteringDisplayColourVolumeBox and SMPTE2086MasteringDisplayMetadataBox have important differences and should not be confused.
+
+Additional boxes may be provided at the end of the [=VisualSampleEntry=] as permitted by ISOBMFF, that may represent redundant or similar information to the one provided in some OBUs contained in the [=AV1CodecConfigurationBox=]. If the box definition does not indicate that its information overrides the OBU information, in case of conflict, the OBU information should be considered authoritative.
+
+AV1 Sample Format {#sampleformat}
+---------------------------------
+
+For tracks using the [=AV1SampleEntry=], an <dfn>AV1 Sample</dfn> has the following constraints:
+- the sample data SHALL be a sequence of [=OBUs=] forming a [=Temporal Unit=],
+- each OBU SHALL follow the [=open_bitstream_unit=] [=Low Overhead Bitstream Format=] syntax as specified in [[!AV1]]. Each OBU SHALL have the [=obu_has_size_field=] set to 1 except for the last OBU in the sample, for which [=obu_has_size_field=] MAY be set to 0, in which case it is assumed to fill the remainder of the sample,
+
+NOTE: When extracting OBUs from an ISOBMFF file, and depending on the capabilities of the decoder processing these OBUs, ISOBMFF parsers MAY need to either: set the [=obu_has_size_field=] to 1 for some OBUs if not already set, add the size field in this case, and add [=Temporal Delimiter OBU=]; or use the length-delimited bitstream format as defined in Annex B of [=AV1=]. If encryption is used, similar operations MAY have to be done before or after decryption depending on the demuxer/decryptor/decoder architecture.
+
+- OBU trailing bits SHOULD be limited to byte alignment and SHOULD not be used for padding,
+- OBUs of type OBU_TEMPORAL_DELIMITER, OBU_PADDING, or OBU_REDUNDANT_FRAME_HEADER SHOULD NOT be used.
+- OBUs of type OBU_TILE_LIST SHALL NOT be used.
+
+If an AV1 Sample is signaled as a sync sample (in the SyncSampleBox or by setting sample_is_non_sync_sample to 0), it SHALL be a Random Access Point as defined in [[!AV1]], i.e. satisfy the following constraints:
+- Its first frame is a [=Key Frame=] that has [=show_frame=] flag set to 1,
+- It contains a [=Sequence Header OBU=] before the first [=Frame Header OBU=].
+
+NOTE: Within this definition, a sync sample may contain additional frames that are not Key Frames. The fact that none of them is the first frame in the temporal unit ensures that they are decodable.
+
+NOTE: Other types of OBUs such as [=metadata OBUs=] could be present before the [=Sequence Header OBU=].
+
+[=Intra-only frames=] SHOULD be signaled using the sample_depends_on flag set to 2.
+
+[=Delayed Random Access Points=] SHOULD be signaled using sample groups and the [=AV1ForwardKeyFrameSampleGroupEntry=].
+
+[=Switch Frames=] SHOULD be signaled using sample groups and the [=AV1SwitchFrameSampleGroupEntry=].
+
+Additionally, if a file contains multiple tracks that are alternative representations of the same content, in particular using [=Switch Frames=], those tracks SHOULD be marked as belonging to the same alternate group and should use a track selection box with an appropriate attribute (e.g. 'bitr').
+
+In tracks using the [=AV1SampleEntry=], the 'ctts' box and composition offsets in movie fragments SHALL NOT be used. Similarly, the is_leading flag, if used, SHALL be set to 0 or 2.
+
+When a temporal unit contains more than one frame, the sample corresponding to that temporal unit MAY be marked using the [=AV1MultiFrameSampleGroupEntry=].
+
+[=Metadata OBUs=] may be carried in sample data. In this case, the [=AV1MetadataSampleGroupEntry=] SHOULD be used. If the [=metadata OBUs=] are static for the entire set of samples associated with a given sample description entry, they SHOULD also be in the OBU array in the sample description entry.
+
+Unless explicitely stated, the grouping_type_parameter is not defined for the SampleToGroupBox with grouping types defined in this specification.
+
+AV1 Forward Key Frame sample group entry {#forwardkeyframesamplegroupentry}
+----------------------------------------------------------------
+
+### Definition ### {#forwardkeyframesamplegroupentry-definition}
+
+<pre class="def">
+	Group Type: <dfn export>av1f</dfn>
+	Container:  Sample Group Description Box ('sgpd')
+	Mandatory:  No
+	Quantity:   Zero or more.
+</pre>
+
+### Description ### {#forwardkeyframesamplegroupentry-description}
+
+The <dfn>AV1ForwardKeyFrameSampleGroupEntry</dfn> documents samples that contain a [=Delayed Random Access Point=] that are followed at a given distance in the bitstream by a [=Key Frame Dependent Recovery Point=].
+
+
+### Syntax ### {#forwardkeyframesamplegroupentry-syntax}
+
+```
+class AV1ForwardKeyFrameSampleGroupEntry extends VisualSampleGroupEntry('av1f') {
+  unsigned int(8) fwd_distance;
+}
+```
+
+### Semantics ### {#forwardkeyframesamplegroupentry-semantics}
+
+The <dfn export>fwd_distance</dfn> field indicates the number of samples between this sample and the next sample containing the associated [=Key Frame Dependent Recovery Point=]. 0 means the next sample.
+
+AV1 Multi-Frame sample group entry {#multiframesamplegroupentry}
+----------------------------------------------------------------
+
+### Definition ### {#multiframesamplegroupentry-definition}
+
+<pre class="def">
+	Group Type: <dfn value export for="AV1MultiFrameSampleGroupEntry">av1m</dfn>
+	Container:  Sample Group Description Box ('sgpd')
+	Mandatory:  No
+	Quantity:   Zero or more.
+</pre>
+
+
+### Description ### {#multiframesamplegroupentry-description}
+
+The <dfn>AV1MultiFrameSampleGroupEntry</dfn> documents samples that contain multiple frames.
+
+
+### Syntax ### {#multiframesamplegroupentry-syntax}
+
+```
+class AV1MultiFrameSampleGroupEntry extends VisualSampleGroupEntry('av1m') {
+}
+```
+
+AV1 Switch Frame sample group entry {#switchframesamplegroupentry}
+-------------------------------------------------------
+
+### Definition ### {#switchframesamplegroupentry-definition}
+
+<pre class="def">
+	Group Type: <dfn export>av1s</dfn>
+	Container:  Sample Group Description Box ('sgpd')
+	Mandatory:  No
+	Quantity:   Zero or more.
+</pre>
+
+
+### Description ### {#switchframesamplegroupentry-description}
+
+The <dfn>AV1SwitchFrameSampleGroupEntry</dfn> documents samples that start with a [=Switch Frame=].
+
+### Syntax ### {#switchframesamplegroupentry-syntax}
+
+```
+class AV1SwitchFrameSampleGroupEntry extends VisualSampleGroupEntry('av1s') {
+}
+```
+
+AV1 Metadata sample group entry {#metadatasamplegroupentry}
+-----------------------------------------------------------
+
+### Definition ### {#metadatasamplegroupentry-definition}
+
+<pre class="def">
+	Group Type: <dfn value noexport for="AV1MetadataSampleGroupEntry">av1M</dfn>
+	Container:  Sample Group Description Box ('sgpd')
+	Mandatory:  No
+	Quantity:   Zero or more.
+</pre>
+
+
+### Description ### {#metadatasamplegroupentry-description}
+
+The <dfn>AV1MetadataSampleGroupEntry</dfn> documents samples that contain [=metadata OBUs=]. The <code>grouping_type_parameter</code> can be used to identify samples containing [=metadata OBUs=] of a given type. If no <code>grouping_type_parameter</code> is provided, the sample group entry identifies samples containing [=metadata OBUs=] for which the <code>metadata_type</code> is unknown.
+
+### Syntax ### {#metadatasamplegroupentry-syntax}
+
+```
+class AV1MetadataSampleGroupEntry extends VisualSampleGroupEntry('av1M') {
+}
+```
+
+For this sample group entry, the <code>grouping_type_parameter</code> syntax is as follows:
+
+```
+{
+   unsigned int (8) metadata_type;
+   unsigned int (24) metadata_specific_parameters;
+}
+```
+
+### Semantics ### {#metadatasamplegroupentry-semantics}
+
+<dfn export>metadata_type</dfn> is a 8-bit field whose value is the value of the metadata_type field defined in [[!AV1]], when it is equal or lower than 255. metadata_type values above 255 are not supported by this sample group.
+
+<dfn export>metadata_specific_parameters</dfn> provides an additional part of the <code>grouping_type_parameter</code>, which MAY be used to distinguish different sample groups having the same <code>metadata_type</code> but different sub-parameters. In this version of the specification, <code>metadata_specific_parameters</code> is only defined when <code>metadata_type</code> is set to <code>METADATA_TYPE_ITUT_T35</code> in which case its value SHALL be set to the first 24 bits of the <code>metadata_itut_t35</code> structure. For other types of metadata, its value SHOULD be set to 0. In all cases, when the <code>grouping_type_parameter</code> is used, readers processing sample groups SHALL use the entire value of <code>grouping_type_parameter</code>.
+
+CMAF AV1 track format {#cmaf}
+=====================================================
+
+[[CMAF]] defines structural constraints on ISOBMFF files additional to [[ISOBMFF]] for the purpose of, for example, adaptive streaming or for protected files. Conformance to these structural constraints is signaled by the presence of the brand <code>[=cmfc=]</code> in the <code>FileTypeBox</code>.
+
+If a [=CMAF Video Track=] uses the brand <code>av01</code>, it is called a <dfn>CMAF AV1 Track</dfn> and the following constraints, defining the CMAF Media Profile for AV1, apply:
+- it SHALL use an [=AV1SampleEntry=]
+- it MAY use multiple sample entries, and in that case the following values SHALL not change in the track:
+    - <code>seq_profile</code>
+    - <code>still_picture</code>
+    - the first value of <code>seq_level_idx</code>
+    - the first value of <code>seq_tier</code>
+    - <code>color_config</code>
+    - <code>initial_presentation_delay_minus_one</code>
+
+When protected, [=CMAF AV1 Tracks=] SHALL use the signaling defined in [[!CMAF]], which in turn relies on [[!CENC]], with the provisions specified in [[#CommonEncryption]].
+
+Common Encryption {#CommonEncryption}
+=========================
+
+[=CMAF AV1 Tracks=] and non-segmented AV1 files MAY be protected. If protected, they SHALL conform to [[!CENC]]. Files SHOULD be protected using the <code>[=cbcs=]</code> protection scheme and MAY be protected using the <code>[=cenc=]</code> protection scheme.
+
+When the protected scheme <code>[=cenc=]</code> is used, samples SHALL be protected using subsample encryption and SHALL NOT use pattern encryption.
+
+When the protected scheme <code>[=cbcs=]</code> is used, samples SHALL be protected using subsample encryption and SHALL use pattern encryption. [[!CENC]] recommends that the Block Pattern length be 10, i.e. <code>crypt_byte_block + skip_byte_block = 10</code>, where a Block is of size 16-bytes. In this specification, the combination of <code>crypt_byte_block</code> and <code>skip_byte_block</code> SHALL be one of the following, with the first one being recommended:
+- <code>crypt_byte_block = 1</code> and <code>skip_byte_block = 9</code>,
+- <code>crypt_byte_block = 5</code> and <code>skip_byte_block = 5</code>,
+- <code>crypt_byte_block = 10</code> and <code>skip_byte_block = 0</code>.
+
+
+General Subsample Encryption constraints {#subsample-encryption}
+--------------------------------------
+
+Within protected samples, the following constraints apply:
+- Protected samples SHALL be exactly spanned by one or more contiguous subsamples.
+	- An OBU MAY be spanned by one or more subsamples, especially when it has multiple ranges of protected data. However, as recommended in [[!CENC]], writers SHOULD reduce the number of subsamples as possible. This can be achieved by using a subsample that spans multiple consecutive unprotected OBUs as well as the first unprotected and protected parts of the following protected OBU, if such protected OBU exists.
+	- A large unprotected OBU whose data size is larger than the maximum size of a single [=BytesOfClearData=] field MAY be spanned by multiple subsamples with zero size [=BytesOfProtectedData=].
+
+- All [=OBU Headers=] and associated [=obu_size=] fields SHALL be unprotected.
+- [=Temporal Delimiter OBUs=], [=Sequence Header OBUs=], and [=Frame Header OBUs=] (including within a [=Frame OBU=]), [=Redundant Frame Header OBUs=] and [=Padding OBUs=] SHALL be unprotected.
+- [=Metadata OBUs=] MAY be protected.
+- [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be protected. Within [=Tile Group OBUs=] or [=Frame OBUs=], the following applies:
+	- for the protected scheme <code>[=cbcs=]</code>:
+		- [=BytesOfProtectedData=] SHALL start on the first byte and end on the last byte of the <code>decode_tile</code> structure (including any trailing bits).
+
+	    NOTE: As a result of the above, [=BytesOfProtectedData=] is not necessarily a multiple of 16 bytes and partial blocks are included in the [=BytesOfProtectedData=] range, but per [[!CENC]] the data is not be encrypted.
+
+	    - A subsample SHALL be created for each tile, even if its size is less than 16 bytes.
+		- All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected.
+
+	- for the protected scheme <code>[=cenc=]</code>:
+	    - [=BytesOfProtectedData=] SHALL be a multiple of 16 bytes.
+	    - [=BytesOfProtectedData=] SHALL end on the last byte of the <code>decode_tile</code> structure (including any trailing bits).
+	    - [=BytesOfProtectedData=] SHALL span all complete 16-byte blocks of the <code>decode_tile</code> structure (including any trailing bits).
+
+	    NOTE: As a result of the above, partial blocks are not used and it is possible that [=BytesOfProtectedData=] does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.
+	    - A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes. If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the [=BytesOfClearData=] field of a surrounding subsample, if any.
+		- All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected.
+
+Subsample Encryption Illustration {#subsample-encryption-illustration}
+------------------
+Figure #1 illustrates Subsample based encryption of AV1.
+
+<figure>
+<img alt="Subsample-based AV1 encryption" src="images/subsample_encryption.svg">
+<figcaption>Subsample-based AV1 encryption.</figcaption>
+</figure>
+
+Codecs Parameter String {#codecsparam}
+======================================
+
+DASH and other applications require defined values for the 'Codecs' parameter specified in [[!RFC6381]] for ISO Media tracks. The codecs parameter string for the AOM AV1 codec is as follows:
+```
+<sample entry 4CC>.<profile>.<level><tier>.<bitDepth>.<monochrome>.<chromaSubsampling>.
+<colorPrimaries>.<transferCharacteristics>.<matrixCoefficients>.<videoFullRangeFlag>
+```
+
+All fields following the sample entry 4CC are expressed as double digit decimals, unless indicated otherwise. Leading or trailing zeros cannot be omitted.
+
+The profile parameter value, represented by a single digit decimal, SHALL equal the value of seq_profile in the [=Sequence Header OBU=].
+
+The level parameter value SHALL equal the first level value indicated by [=seq_level_idx=] in the [=Sequence Header OBU=].
+
+The tier parameter value SHALL be equal to <code>M</code> when the first [=seq_tier=] value in the [=Sequence Header OBU=] is equal to 0, and <code>H</code> when it is equal to 1.
+
+The bitDepth parameter value SHALL equal the value of BitDepth variable as defined in [[AV1]] derived from the [=Sequence Header OBU=].
+
+The monochrome parameter value, represented by a single digit decimal, SHALL equal the value of mono_chrome in the [=Sequence Header OBU=].
+
+The chromaSubsampling parameter value, represented by a three-digit decimal, SHALL have its first digit equal to subsampling_x and its second digit equal to subsampling_y. If both subsampling_x and subsampling_y are set to 1, then the third digit SHALL be equal to chroma_sample_position, otherwise it SHALL be set to 0.
+
+The colorPrimaries, transferCharacteristics, matrixCoefficients, and videoFullRangeFlag parameter values SHALL equal the value of matching fields in the [=Sequence Header OBU=], if color_description_present_flag is set to 1, otherwise they SHOULD not be set, defaulting to the values below. The videoFullRangeFlag is represented by a single digit.
+
+For example, codecs="av01.0.04M.10.0.112.09.16.09.0" represents AV1 Main Profile, level 3.0, Main tier, 10-bit content, non-monochrome, with 4:2:0 chroma subsampling co-located with (0, 0) luma sample, ITU-R BT.2100 color primaries, ITU-R BT.2100 PQ transfer characteristics, ITU-R BT.2100 YCbCr color matrix, and studio swing representation.
+
+The parameters sample entry 4CC, profile, level, tier, and bitDepth are all mandatory fields. If any of these fields are empty, or not within their allowed range, the processing device SHOULD treat it as an error.
+
+All the other fields (including their leading '.') are optional, mutually inclusive (all or none) fields. If not specified then the values listed in the table below are assumed.
+
+<table class="def">
+<tr>
+<td>mono_chrome</td><td>0</td>
+</tr>
+<tr>
+<td>chromaSubsampling</td><td>110 (4:2:0)</td>
+</tr>
+<tr>
+<td>colorPrimaries</td><td>1 (ITU-R BT.709)</td>
+</tr>
+<tr>
+<td>transferCharacteristics</td><td>1 (ITU-R BT.709)</td>
+</tr>
+<tr>
+<td>matrixCoefficients</td><td>1 (ITU-R BT.709)</td>
+</tr>
+<tr>
+<td>videoFullRangeFlag</td><td>0 (studio swing representation)</td>
+</tr>
+</table>
+
+The string codecs="av01.0.01M.08" in this case would represent AV1 Main Profile, level 2.1, Main tier, 8-bit content with 4:2:0 chroma subsampling, ITU-R BT.709 color primaries, transfer characteristics, matrix coefficients, and studio swing representation.
+
+If any character that is not '.', digits, part of the AV1 4CC, or a tier value is encountered, the string SHALL be interpreted ignoring all the characters starting from that character.
+
+Changes since v1.1.0 release {#changelist}
+==========================================
+- <a href="https://github.com/AOMediaCodec/av1-isobmff/pull/116"> Change tile/subsample alignement for the <code>cbcs</code> protection scheme.</a>
+
+
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+  <meta content="Bikeshed version d9bd89757, updated Thu Mar 23 10:06:53 2023 -0700" name="generator">
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-<style>/* Boilerplate: style-autolinks */
+  <meta content="61b1746fa5bbc0b94100eab194bef5961db1c4b6" name="document-revision">
+<style>/* style-autolinks */
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-    }
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-        --bg: black;
-
-        --unofficial-watermark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='400' height='400'%3E%3Cg fill='%23100808' transform='translate(200 200) rotate(-45) translate(-200 -200)' stroke='%23100808' stroke-width='3'%3E%3Ctext x='50%25' y='220' style='font: bold 70px sans-serif; text-anchor: middle; letter-spacing: 6px;'%3EUNOFFICIAL%3C/text%3E%3Ctext x='50%25' y='305' style='font: bold 70px sans-serif; text-anchor: middle; letter-spacing: 6px;'%3EDRAFT%3C/text%3E%3C/g%3E%3C/svg%3E");
-
-        --logo-bg: #1a5e9a;
-        --logo-active-bg: #c00;
-        --logo-text: white;
-
-        --tocnav-normal-text: #999;
-        --tocnav-normal-bg: var(--bg);
-        --tocnav-hover-text: var(--tocnav-normal-text);
-        --tocnav-hover-bg: #080808;
-        --tocnav-active-text: #f44;
-        --tocnav-active-bg: var(--tocnav-normal-bg);
-
-        --tocsidebar-text: var(--text);
-        --tocsidebar-bg: #080808;
-        --tocsidebar-shadow: rgba(255,255,255,.1);
-        --tocsidebar-heading-text: hsla(203,20%,40%,.7);
-
-        --toclink-text: var(--text);
-        --toclink-underline: #6af;
-        --toclink-visited-text: var(--toclink-text);
-        --toclink-visited-underline: #054572;
-
-        --heading-text: #8af;
-
-        --hr-text: var(--text);
-
-        --algo-border: #456;
-
-        --del-text: #f44;
-        --del-bg: transparent;
-        --ins-text: #4a4;
-        --ins-bg: transparent;
-
-        --a-normal-text: #6af;
-        --a-normal-underline: #555;
-        --a-visited-text: var(--a-normal-text);
-        --a-visited-underline: var(--a-normal-underline);
-        --a-hover-bg: rgba(25%, 25%, 25%, .2);
-        --a-active-text: #f44;
-        --a-active-underline: var(--a-active-text);
-
-        --borderedblock-bg: rgba(255, 255, 255, .05);
-
-        --blockquote-border: silver;
-        --blockquote-bg: var(--borderedblock-bg);
-        --blockquote-text: currentcolor;
-
-        --issue-border: #e05252;
-        --issue-bg: var(--borderedblock-bg);
-        --issue-text: var(--text);
-        --issueheading-text: hsl(0deg, 70%, 70%);
-
-        --example-border: hsl(50deg, 90%, 60%);
-        --example-bg: var(--borderedblock-bg);
-        --example-text: var(--text);
-        --exampleheading-text: hsl(50deg, 70%, 70%);
-
-        --note-border: hsl(120deg, 100%, 35%);
-        --note-bg: var(--borderedblock-bg);
-        --note-text: var(--text);
-        --noteheading-text: hsl(120, 70%, 70%);
-        --notesummary-underline: silver;
-
-        --assertion-border: #444;
-        --assertion-bg: var(--borderedblock-bg);
-        --assertion-text: var(--text);
-
-        --advisement-border: orange;
-        --advisement-bg: #222218;
-        --advisement-text: var(--text);
-        --advisementheading-text: #f84;
-
-        --warning-border: red;
-        --warning-bg: hsla(40,100%,20%,0.95);
-        --warning-text: var(--text);
-
-        --amendment-border: #330099;
-        --amendment-bg: #080010;
-        --amendment-text: var(--text);
-        --amendmentheading-text: #cc00ff;
-
-        --def-border: #8ccbf2;
-        --def-bg: #080818;
-        --def-text: var(--text);
-        --defrow-border: #136;
-
-        --datacell-border: silver;
-
-        --indexinfo-text: #aaa;
-
-        --indextable-hover-text: var(--text);
-        --indextable-hover-bg: #181818;
-
-        --outdatedspec-bg: rgba(255, 255, 255, .5);
-        --outdatedspec-text: black;
-        --outdated-bg: maroon;
-        --outdated-text: white;
-        --outdated-shadow: red;
-
-        --editedrec-bg: darkorange;
-    }
-    /* In case a transparent-bg image doesn't expect to be on a dark bg,
-       which is quite common in practice... */
-    img { background: white; }
-}
 </style>
-<style>/* Boilerplate: style-counters */
+<style>/* style-counters */
 body {
     counter-reset: example figure issue;
 }
@@ -1811,75 +1692,17 @@
     content: "Figure " counter(figure) " ";
 }
 </style>
-<style>/* Boilerplate: style-dfn-panel */
-:root {
-    --dfnpanel-bg: #ddd;
-    --dfnpanel-text: var(--text);
-}
-@media (prefers-color-scheme: dark) {
-    :root {
-        --dfnpanel-bg: #222;
-        --dfnpanel-text: var(--text);
-    }
-}
-.dfn-panel {
-    position: absolute;
-    z-index: 35;
-    width: 20em;
-    width: 300px;
-    height: auto;
-    max-height: 500px;
-    overflow: auto;
-    padding: 0.5em 0.75em;
-    font: small Helvetica Neue, sans-serif, Droid Sans Fallback;
-    background: var(--dfnpanel-bg);
-    color: var(--dfnpanel-text);
-    border: outset 0.2em;
-    white-space: normal; /* in case it's moved into a pre */
-}
-.dfn-panel:not(.on) { display: none; }
-.dfn-panel * { margin: 0; padding: 0; text-indent: 0; }
-.dfn-panel > b { display: block; }
-.dfn-panel a { color: var(--dfnpanel-text); }
-.dfn-panel a:not(:hover) { text-decoration: none !important; border-bottom: none !important; }
-.dfn-panel > b + b { margin-top: 0.25em; }
-.dfn-panel ul { padding: 0 0 0 1em; list-style: none; }
-.dfn-panel li a {
-    white-space: pre;
-    display: inline-block;
-    max-width: calc(300px - 1.5em - 1em);
-    overflow: hidden;
-    text-overflow: ellipsis;
-}
-
-.dfn-panel.activated {
-    display: inline-block;
-    position: fixed;
-    left: .5em;
-    bottom: 2em;
-    margin: 0 auto;
-    max-width: calc(100vw - 1.5em - .4em - .5em);
-    max-height: 30vh;
-}
-
-.dfn-paneled[role="button"] { cursor: pointer; }
-</style>
-<style>/* Boilerplate: style-dfn-panel */
+<style>/* style-dfn-panel */
 :root {
     --dfnpanel-bg: #ddd;
     --dfnpanel-text: var(--text);
 }
-@media (prefers-color-scheme: dark) {
-    :root {
-        --dfnpanel-bg: #222;
-        --dfnpanel-text: var(--text);
-    }
-}
 .dfn-panel {
     position: absolute;
     z-index: 35;
     width: 20em;
-    width: 300px;
+    min-width: min-content;
+    max-width: 300px;
     height: auto;
     max-height: 500px;
     overflow: auto;
@@ -1896,15 +1719,8 @@
 .dfn-panel a { color: var(--dfnpanel-text); }
 .dfn-panel a:not(:hover) { text-decoration: none !important; border-bottom: none !important; }
 .dfn-panel > b + b { margin-top: 0.25em; }
-.dfn-panel ul { padding: 0 0 0 1em; list-style: none; }
-.dfn-panel li a {
-    white-space: pre;
-    display: inline-block;
-    max-width: calc(300px - 1.5em - 1em);
-    overflow: hidden;
-    text-overflow: ellipsis;
-}
-
+.dfn-panel ul { padding: 0; }
+.dfn-panel li { list-style: inside; }
 .dfn-panel.activated {
     display: inline-block;
     position: fixed;
@@ -1915,9 +1731,9 @@
     max-height: 30vh;
 }
 
-.dfn-paneled[role="button"] { cursor: pointer; }
+.dfn-paneled { cursor: pointer; }
 </style>
-<style>/* Boilerplate: style-issues */
+<style>/* style-issues */
 a[href].issue-return {
     float: right;
     float: inline-end;
@@ -1926,7 +1742,7 @@
     text-decoration: none;
 }
 </style>
-<style>/* Boilerplate: style-md-lists */
+<style>/* style-md-lists */
 /* This is a weird hack for me not yet following the commonmark spec
    regarding paragraph and lists. */
 [data-md] > :first-child {
@@ -1936,7 +1752,7 @@
     margin-bottom: 0;
 }
 </style>
-<style>/* Boilerplate: style-selflinks */
+<style>/* style-selflinks */
 
 :root {
     --selflink-text: white;
@@ -1992,9 +1808,138 @@
     color: var(--selflink-hover-text);
 }
 
-a.self-link::before            { content: "¶"; }
-.heading > a.self-link::before { content: "§"; }
-dfn > a.self-link::before      { content: "#"; }
+a.self-link::before            { content: "¶"; }
+.heading > a.self-link::before { content: "§"; }
+dfn > a.self-link::before      { content: "#"; }
+</style>
+<style>/* style-darkmode */
+
+@media (prefers-color-scheme: dark) {
+    :root {
+        --text: #ddd;
+        --bg: black;
+
+        --unofficial-watermark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='400' height='400'%3E%3Cg fill='%23100808' transform='translate(200 200) rotate(-45) translate(-200 -200)' stroke='%23100808' stroke-width='3'%3E%3Ctext x='50%25' y='220' style='font: bold 70px sans-serif; text-anchor: middle; letter-spacing: 6px;'%3EUNOFFICIAL%3C/text%3E%3Ctext x='50%25' y='305' style='font: bold 70px sans-serif; text-anchor: middle; letter-spacing: 6px;'%3EDRAFT%3C/text%3E%3C/g%3E%3C/svg%3E");
+
+        --logo-bg: #1a5e9a;
+        --logo-active-bg: #c00;
+        --logo-text: white;
+
+        --tocnav-normal-text: #999;
+        --tocnav-normal-bg: var(--bg);
+        --tocnav-hover-text: var(--tocnav-normal-text);
+        --tocnav-hover-bg: #080808;
+        --tocnav-active-text: #f44;
+        --tocnav-active-bg: var(--tocnav-normal-bg);
+
+        --tocsidebar-text: var(--text);
+        --tocsidebar-bg: #080808;
+        --tocsidebar-shadow: rgba(255,255,255,.1);
+        --tocsidebar-heading-text: hsla(203,20%,40%,.7);
+
+        --toclink-text: var(--text);
+        --toclink-underline: #6af;
+        --toclink-visited-text: var(--toclink-text);
+        --toclink-visited-underline: #054572;
+
+        --heading-text: #8af;
+
+        --hr-text: var(--text);
+
+        --algo-border: #456;
+
+        --del-text: #f44;
+        --del-bg: transparent;
+        --ins-text: #4a4;
+        --ins-bg: transparent;
+
+        --a-normal-text: #6af;
+        --a-normal-underline: #555;
+        --a-visited-text: var(--a-normal-text);
+        --a-visited-underline: var(--a-normal-underline);
+        --a-hover-bg: rgba(25%, 25%, 25%, .2);
+        --a-active-text: #f44;
+        --a-active-underline: var(--a-active-text);
+
+        --borderedblock-bg: rgba(255, 255, 255, .05);
+
+        --blockquote-border: silver;
+        --blockquote-bg: var(--borderedblock-bg);
+        --blockquote-text: currentcolor;
+
+        --issue-border: #e05252;
+        --issue-bg: var(--borderedblock-bg);
+        --issue-text: var(--text);
+        --issueheading-text: hsl(0deg, 70%, 70%);
+
+        --example-border: hsl(50deg, 90%, 60%);
+        --example-bg: var(--borderedblock-bg);
+        --example-text: var(--text);
+        --exampleheading-text: hsl(50deg, 70%, 70%);
+
+        --note-border: hsl(120deg, 100%, 35%);
+        --note-bg: var(--borderedblock-bg);
+        --note-text: var(--text);
+        --noteheading-text: hsl(120, 70%, 70%);
+        --notesummary-underline: silver;
+
+        --assertion-border: #444;
+        --assertion-bg: var(--borderedblock-bg);
+        --assertion-text: var(--text);
+
+        --advisement-border: orange;
+        --advisement-bg: #222218;
+        --advisement-text: var(--text);
+        --advisementheading-text: #f84;
+
+        --warning-border: red;
+        --warning-bg: hsla(40,100%,20%,0.95);
+        --warning-text: var(--text);
+
+        --amendment-border: #330099;
+        --amendment-bg: #080010;
+        --amendment-text: var(--text);
+        --amendmentheading-text: #cc00ff;
+
+        --def-border: #8ccbf2;
+        --def-bg: #080818;
+        --def-text: var(--text);
+        --defrow-border: #136;
+
+        --datacell-border: silver;
+
+        --indexinfo-text: #aaa;
+
+        --indextable-hover-text: var(--text);
+        --indextable-hover-bg: #181818;
+
+        --outdatedspec-bg: rgba(255, 255, 255, .5);
+        --outdatedspec-text: black;
+        --outdated-bg: maroon;
+        --outdated-text: white;
+        --outdated-shadow: red;
+
+        --editedrec-bg: darkorange;
+    }
+    /* In case a transparent-bg image doesn't expect to be on a dark bg,
+       which is quite common in practice... */
+    img { background: white; }
+}
+
+@media (prefers-color-scheme: dark) {
+    :root {
+        --selflink-text: black;
+        --selflink-bg: silver;
+        --selflink-hover-text: white;
+    }
+}
+
+@media (prefers-color-scheme: dark) {
+    :root {
+        --dfnpanel-bg: #222;
+        --dfnpanel-text: var(--text);
+    }
+}
 </style>
  <body class="h-entry">
   <div class="head">
@@ -2124,11 +2069,11 @@ <h3 class="heading settled" data-level="2.1" id="brands"><span class="secno">2.1
     <li data-md><span id="assert-3d78af2f">It SHALL conform to the normative requirements of <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a></span> 
     <li data-md><span id="assert-03258f22">It SHALL have the <dfn class="css" data-dfn-for="ISOBMFF Brand" data-dfn-type="value" data-export id="valdef-isobmff-brand-av01">av01<a class="self-link" href="#valdef-isobmff-brand-av01"></a></dfn> brand among the compatible brands array of the FileTypeBox</span> 
     <li data-md><span id="assert-0f24a9ee">It SHALL contain at least one track using an <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry">AV1SampleEntry</a></span> 
-    <li data-md><span id="assert-5e63f779">It SHOULD indicate a structural ISOBMFF brand among the compatible brands array of the FileTypeBox, such as <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something">iso6</a></span> 
+    <li data-md><span id="assert-5e63f779">It SHOULD indicate a structural ISOBMFF brand among the compatible brands array of the FileTypeBox, such as <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006">iso6</a></span> 
     <li data-md><span id="assert-c652c075">It MAY indicate CMAF brands as specified in <a href="#cmaf">§ 3 CMAF AV1 track format</a></span> 
     <li data-md><span id="assert-384c2374">It MAY indicate other brands not specified in this document provided that the associated requirements do not conflict with those given in this specification</span> 
    </ul>
-   <p>Parsers SHALL support the structures required by the <code><a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①">iso6</a></code> brand and MAY support structures required by further ISOBMFF structural brands.</p>
+   <p>Parsers SHALL support the structures required by the <code><a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①">iso6</a></code> brand and MAY support structures required by further ISOBMFF structural brands.</p>
    <h3 class="heading settled" data-level="2.2" id="av1sampleentry-section"><span class="secno">2.2. </span><span class="content">AV1 Sample Entry</span><a class="self-link" href="#av1sampleentry-section"></a></h3>
    <h4 class="heading settled" data-level="2.2.1" id="av1sampleentry-definition"><span class="secno">2.2.1. </span><span class="content">Definition</span><a class="self-link" href="#av1sampleentry-definition"></a></h4>
 <pre class="def">Sample Entry Type: <dfn data-dfn-for="AV1SampleEntry" data-dfn-type="value" data-export id="valdef-av1sampleentry-av01">av01<a class="self-link" href="#valdef-av1sampleentry-av01"></a></dfn>
@@ -2144,15 +2089,15 @@ <h4 class="heading settled" data-level="2.2.3" id="av1sampleentry-syntax"><span
 }
 </pre>
    <h4 class="heading settled" data-level="2.2.4" id="av1sampleentry-semantics"><span class="secno">2.2.4. </span><span class="content">Semantics</span><a class="self-link" href="#av1sampleentry-semantics"></a></h4>
-    <span id="assert-4708372f">The <dfn data-dfn-type="dfn" data-noexport id="width">width<a class="self-link" href="#width"></a></dfn> and <dfn data-dfn-type="dfn" data-noexport id="height">height<a class="self-link" href="#height"></a></dfn> fields of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something②">VisualSampleEntry</a> SHALL equal the values of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2④">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑤">max_frame_height_minus_1</a> + 1 of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41">Sequence Header OBU</a> applying to the samples associated with this sample entry.</span> <span id="assert-1624cff2">The width and height in the TrackHeaderBox SHOULD equal, respectively, the maximum RenderWidth, called MaxRenderWidth, and the maximum RenderHeight, called MaxRenderHeight, of all the frames associated with this sample entry.</span> <span id="assert-54ae6192">Additionally, if MaxRenderWidth and MaxRenderHeight values do not equal respectively the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑥">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑦">max_frame_height_minus_1</a> + 1 values of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①">Sequence Header OBU</a>, a PixelAspectRatioBox box SHALL be present in the sample entry and set such that</span> 
+    <span id="assert-4708372f">The <dfn data-dfn-type="dfn" data-noexport id="width">width<a class="self-link" href="#width"></a></dfn> and <dfn data-dfn-type="dfn" data-noexport id="height">height<a class="self-link" href="#height"></a></dfn> fields of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006②">VisualSampleEntry</a> SHALL equal the values of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2④">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑤">max_frame_height_minus_1</a> + 1 of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41">Sequence Header OBU</a> applying to the samples associated with this sample entry.</span> <span id="assert-1624cff2">The width and height in the TrackHeaderBox SHOULD equal, respectively, the maximum RenderWidth, called MaxRenderWidth, and the maximum RenderHeight, called MaxRenderHeight, of all the frames associated with this sample entry.</span> <span id="assert-54ae6192">Additionally, if MaxRenderWidth and MaxRenderHeight values do not equal respectively the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑥">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑦">max_frame_height_minus_1</a> + 1 values of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①">Sequence Header OBU</a>, a PixelAspectRatioBox box SHALL be present in the sample entry and set such that</span> 
 <pre>hSpacing / vSpacing = MaxRenderWidth * (max_frame_height_minus_1 + 1) /
                               ((max_frame_width_minus_1 + 1) * MaxRenderHeight)
 </pre>
-   <p>The <dfn data-dfn-type="dfn" data-noexport id="compressorname">compressorname<a class="self-link" href="#compressorname"></a></dfn> field of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something③">VisualSampleEntry</a> is an informative name. It is formatted in a fixed 32-byte field, with the first byte set to the number of bytes to be displayed, followed by that number of bytes of displayable data, followed by padding to complete 32 bytes total (including the size byte). <span id="assert-da9cc152">The value "\012AOM Coding" is RECOMMENDED</span>; the first byte is a count of the remaining bytes, here represented by \012, which (being octal 12) is decimal 10, the number of bytes in the rest of the string.</p>
+   <p>The <dfn data-dfn-type="dfn" data-noexport id="compressorname">compressorname<a class="self-link" href="#compressorname"></a></dfn> field of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006③">VisualSampleEntry</a> is an informative name. It is formatted in a fixed 32-byte field, with the first byte set to the number of bytes to be displayed, followed by that number of bytes of displayable data, followed by padding to complete 32 bytes total (including the size byte). <span id="assert-da9cc152">The value "\012AOM Coding" is RECOMMENDED</span>; the first byte is a count of the remaining bytes, here represented by \012, which (being octal 12) is decimal 10, the number of bytes in the rest of the string.</p>
    <p class="note" role="note"><span class="marker">NOTE:</span> Parsers may ignore the value of the compressorname field. It is specified in this document simply for legacy and backwards compatibility reasons.</p>
     <span id="assert-8d3f8e0c">The <dfn data-dfn-type="dfn" data-noexport id="config">config<a class="self-link" href="#config"></a></dfn> field SHALL contain an <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox①">AV1CodecConfigurationBox</a> that applies to the samples associated with this sample entry.</span> 
    <p class="note" role="note"><span class="marker">NOTE:</span> <span id="assert-8d7a614c">Multiple instances of <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry①">AV1SampleEntry</a> may be required when the track contains samples requiring a <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox②">AV1CodecConfigurationBox</a> with different characteristics.</span></p>
-    <span id="assert-d9e74d75">Optional boxes not specifically mentioned here can be present, in particular those indicated in the definition of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something④">VisualSampleEntry</a> in <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a>.</span> 
+    <span id="assert-d9e74d75">Optional boxes not specifically mentioned here can be present, in particular those indicated in the definition of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006④">VisualSampleEntry</a> in <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a>.</span> 
    <h3 class="heading settled" data-level="2.3" id="av1codecconfigurationbox-section"><span class="secno">2.3. </span><span class="content">AV1 Codec Configuration Box</span><a class="self-link" href="#av1codecconfigurationbox-section"></a></h3>
    <h4 class="heading settled" data-level="2.3.1" id="av1codecconfigurationbox-definition"><span class="secno">2.3.1. </span><span class="content">Definition</span><a class="self-link" href="#av1codecconfigurationbox-definition"></a></h4>
 <pre class="def">Box Type:  <dfn data-dfn-type="dfn" data-export id="av1c">av1C<a class="self-link" href="#av1c"></a></dfn>
@@ -2240,10 +2185,10 @@ <h4 class="heading settled" data-level="2.3.4" id="av1codecconfigurationbox-sema
    <p>OBUs stored in the configOBUs field follow the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑥">open_bitstream_unit</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39①">Low Overhead Bitstream Format</a> syntax as specified in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a>. <span id="assert-cf9ef74c">The flag <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑦">obu_has_size_field</a> SHALL be set to 1, indicating that the size of the OBU payload follows the header, and that it is coded using LEB128</span>.</p>
     <span id="assert-745b4db3">When a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑨">Sequence Header OBU</a> is contained within the configOBUs of the AV1CodecConfigurationRecord, the values present in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⓪">Sequence Header OBU</a> contained within configOBUs SHALL match the values of the AV1CodecConfigurationRecord.</span> 
    <p>The presentation times of AV1 samples are given by the ISOBMFF structures. <span id="assert-551498bd">The <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑧">timing_info_present_flag</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②①">Sequence Header OBU</a> (in the configOBUs field or in the associated samples) SHOULD be set to 0</span>. <span id="assert-9be6e647">If set to 1, the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45" id="ref-for-page=45">timing_info</a> structure of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②②">Sequence Header OBU</a>, the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑨">frame_presentation_time</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⓪">buffer_removal_time</a> fields of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49">Frame Header OBUs</a>, if present, SHALL be ignored for the purpose of timed processing of the ISOBMFF file.</span></p>
-    <span id="assert-6056f4f8">The sample entry SHOULD contain a <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑤">colr</a> box with a colour_type set to <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑥">nclx</a></span>. <span id="assert-77d36bce">If present, the values of colour_primaries, transfer_characteristics, and matrix_coefficients SHALL match the values given in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②③">Sequence Header OBU</a> (in the configOBUs field or in the associated samples) if the color_description_present_flag is set to 1</span>. Similarly, <span id="assert-38597d4f">the full_range_flag in the <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑦">colr</a> box shall match the color_range flag in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②④">Sequence Header OBU</a>. When configOBUs does not contain a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑤">Sequence Header OBU</a>, this box with colour_type set to <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑧">nclx</a> SHALL be present.</span> <span id="assert-7eb8e932">The CleanApertureBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑨">clap</a> SHOULD not be present.</span> 
-   <p>For sample entries corresponding to HDR content, <span id="assert-bd7bad9a">the MasteringDisplayColourVolumeBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①⓪">mdcv</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①①">clli</a> SHOULD be present</span>, and <span id="assert-dbf01b08">their values SHALL match the values of contained in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46①">Metadata OBUs</a> of type METADATA_TYPE_HDR_CLL and METADATA_TYPE_HDR_MDCV, if present (in the configOBUs or in the samples).</span></p>
-   <p class="note" role="note"><span class="marker">NOTE:</span> The MasteringDisplayColourVolumeBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①②">mdcv</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①③">clli</a> have identical syntax to the SMPTE2086MasteringDisplayMetadataBox <a class="property css" data-link-type="property" href="https://www.webmproject.org/vp9/mp4/#" id="ref-for-something①④">SmDm</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.webmproject.org/vp9/mp4/#" id="ref-for-something①⑤">CoLL</a>, except that they are of type <code>Box</code> and not <code>FullBox</code>. However, the semantics of the MasteringDisplayColourVolumeBox and SMPTE2086MasteringDisplayMetadataBox have important differences and should not be confused.</p>
-    <span id="assert-fa8b4082">Additional boxes may be provided at the end of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①⑥">VisualSampleEntry</a> as permitted by ISOBMFF, that may represent redundant or similar information to the one provided in some OBUs contained in the <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox⑤">AV1CodecConfigurationBox</a></span>. If the box definition does not indicate that its information overrides the OBU information, in case of conflict, the OBU information should be considered authoritative. 
+    <span id="assert-6056f4f8">The sample entry SHOULD contain a <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑤">colr</a> box with a colour_type set to <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑥">nclx</a></span>. <span id="assert-77d36bce">If present, the values of colour_primaries, transfer_characteristics, and matrix_coefficients SHALL match the values given in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②③">Sequence Header OBU</a> (in the configOBUs field or in the associated samples) if the color_description_present_flag is set to 1</span>. Similarly, <span id="assert-38597d4f">the full_range_flag in the <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑦">colr</a> box shall match the color_range flag in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②④">Sequence Header OBU</a>. When configOBUs does not contain a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑤">Sequence Header OBU</a>, this box with colour_type set to <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑧">nclx</a> SHALL be present.</span> <span id="assert-7eb8e932">The CleanApertureBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑨">clap</a> SHOULD not be present.</span> 
+   <p>For sample entries corresponding to HDR content, <span id="assert-bd7bad9a">the MasteringDisplayColourVolumeBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①⓪">mdcv</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①①">clli</a> SHOULD be present</span>, and <span id="assert-dbf01b08">their values SHALL match the values of contained in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46①">Metadata OBUs</a> of type METADATA_TYPE_HDR_CLL and METADATA_TYPE_HDR_MDCV, if present (in the configOBUs or in the samples).</span></p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> The MasteringDisplayColourVolumeBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①②">mdcv</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①③">clli</a> have identical syntax to the SMPTE2086MasteringDisplayMetadataBox <a class="property css" data-link-type="property" href="https://www.webmproject.org/vp9/mp4/#" id="ref-for-37f26709df4ef02bccacdfb3c0626342">SmDm</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.webmproject.org/vp9/mp4/#" id="ref-for-37f26709df4ef02bccacdfb3c0626342①">CoLL</a>, except that they are of type <code>Box</code> and not <code>FullBox</code>. However, the semantics of the MasteringDisplayColourVolumeBox and SMPTE2086MasteringDisplayMetadataBox have important differences and should not be confused.</p>
+    <span id="assert-fa8b4082">Additional boxes may be provided at the end of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①④">VisualSampleEntry</a> as permitted by ISOBMFF, that may represent redundant or similar information to the one provided in some OBUs contained in the <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox⑤">AV1CodecConfigurationBox</a></span>. If the box definition does not indicate that its information overrides the OBU information, in case of conflict, the OBU information should be considered authoritative. 
    <h3 class="heading settled" data-level="2.4" id="sampleformat"><span class="secno">2.4. </span><span class="content">AV1 Sample Format</span><a class="self-link" href="#sampleformat"></a></h3>
    <p>For tracks using the <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry②">AV1SampleEntry</a>, an <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1-sample">AV1 Sample</dfn> has the following constraints:</p>
    <ul>
@@ -2266,8 +2211,8 @@ <h3 class="heading settled" data-level="2.4" id="sampleformat"><span class="secn
    <p class="note" role="note"><span class="marker">NOTE:</span> Within this definition, a sync sample may contain additional frames that are not Key Frames. The fact that none of them is the first frame in the temporal unit ensures that they are decodable.</p>
    <p class="note" role="note"><span class="marker">NOTE:</span> Other types of OBUs such as <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46③">metadata OBUs</a> could be present before the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑦">Sequence Header OBU</a>.</p>
     <span id="assert-0c895956"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑦">Intra-only frames</a> SHOULD be signaled using the sample_depends_on flag set to 2</span>. <span id="assert-4f779503"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑦">Delayed Random Access Points</a> SHOULD be signaled using sample groups and the <a data-link-type="dfn" href="#av1forwardkeyframesamplegroupentry" id="ref-for-av1forwardkeyframesamplegroupentry①">AV1ForwardKeyFrameSampleGroupEntry</a></span>. <span id="assert-d10ee363"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑧">Switch Frames</a> SHOULD be signaled using sample groups and the <a data-link-type="dfn" href="#av1switchframesamplegroupentry" id="ref-for-av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</a></span>. 
-   <p>Additionally, <span id="assert-ccbd7555">if a file contains multiple tracks that are alternative representations of the same content, in particular using <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑨">Switch Frames</a>, those tracks SHOULD be marked as belonging to the same alternate group</span> and <span id="assert-2fee74f1">should use a track selection box with an appropriate attribute (e.g. <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①⑦">bitr</a>)</span>.</p>
-    <span id="assert-0f174d22">In tracks using the <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry③">AV1SampleEntry</a>, the <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①⑧">ctts</a> box and composition offsets in movie fragments SHALL NOT be used</span>. Similarly, <span id="assert-cb746c39">the is_leading flag, if used, SHALL be set to 0 or 2</span>. <span id="assert-227cd7b6">When a temporal unit contains more than one frame, the sample corresponding to that temporal unit MAY be marked using the <a data-link-type="dfn" href="#av1multiframesamplegroupentry" id="ref-for-av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</a></span>. <span id="assert-e8ac7f22"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46④">Metadata OBUs</a> may be carried in sample data</span>. In this case, <span id="assert-d41e5e3f">the <a data-link-type="dfn" href="#av1metadatasamplegroupentry" id="ref-for-av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</a> SHOULD be used</span>. <span id="assert-f0ce5ae3">If the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑤">metadata OBUs</a> are static for the entire set of samples associated with a given sample description entry, they SHOULD also be in the OBU array in the sample description entry</span>. 
+   <p>Additionally, <span id="assert-ccbd7555">if a file contains multiple tracks that are alternative representations of the same content, in particular using <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑨">Switch Frames</a>, those tracks SHOULD be marked as belonging to the same alternate group</span> and <span id="assert-2fee74f1">should use a track selection box with an appropriate attribute (e.g. <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①⑤">bitr</a>)</span>.</p>
+    <span id="assert-0f174d22">In tracks using the <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry③">AV1SampleEntry</a>, the <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①⑥">ctts</a> box and composition offsets in movie fragments SHALL NOT be used</span>. Similarly, <span id="assert-cb746c39">the is_leading flag, if used, SHALL be set to 0 or 2</span>. <span id="assert-227cd7b6">When a temporal unit contains more than one frame, the sample corresponding to that temporal unit MAY be marked using the <a data-link-type="dfn" href="#av1multiframesamplegroupentry" id="ref-for-av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</a></span>. <span id="assert-e8ac7f22"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46④">Metadata OBUs</a> may be carried in sample data</span>. In this case, <span id="assert-d41e5e3f">the <a data-link-type="dfn" href="#av1metadatasamplegroupentry" id="ref-for-av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</a> SHOULD be used</span>. <span id="assert-f0ce5ae3">If the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑤">metadata OBUs</a> are static for the entire set of samples associated with a given sample description entry, they SHOULD also be in the OBU array in the sample description entry</span>. 
    <p>Unless explicitely stated, the grouping_type_parameter is not defined for the SampleToGroupBox with grouping types defined in this specification.</p>
    <h3 class="heading settled" data-level="2.5" id="forwardkeyframesamplegroupentry"><span class="secno">2.5. </span><span class="content">AV1 Forward Key Frame sample group entry</span><a class="self-link" href="#forwardkeyframesamplegroupentry"></a></h3>
    <h4 class="heading settled" data-level="2.5.1" id="forwardkeyframesamplegroupentry-definition"><span class="secno">2.5.1. </span><span class="content">Definition</span><a class="self-link" href="#forwardkeyframesamplegroupentry-definition"></a></h4>
@@ -2334,8 +2279,8 @@ <h4 class="heading settled" data-level="2.8.4" id="metadatasamplegroupentry-sema
    <p><dfn data-dfn-type="dfn" data-export id="metadata_type">metadata_type<a class="self-link" href="#metadata_type"></a></dfn> is a 8-bit field whose value is the value of the metadata_type field defined in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a>, when it is equal or lower than 255. metadata_type values above 255 are not supported by this sample group.</p>
    <p><dfn data-dfn-type="dfn" data-export id="metadata_specific_parameters">metadata_specific_parameters<a class="self-link" href="#metadata_specific_parameters"></a></dfn> provides an additional part of the <code>grouping_type_parameter</code>, which MAY be used to distinguish different sample groups having the same <code>metadata_type</code> but different sub-parameters. <span id="assert-7d13a03d">In this version of the specification, <code>metadata_specific_parameters</code> is only defined when <code>metadata_type</code> is set to <code>METADATA_TYPE_ITUT_T35</code> in which case its value SHALL be set to the first 24 bits of the <code>metadata_itut_t35</code> structure.</span> <span id="assert-973cddc9">For other types of metadata, its value SHOULD be set to 0. In all cases, when the <code>grouping_type_parameter</code> is used, readers processing sample groups SHALL use the entire value of <code>grouping_type_parameter</code></span>.</p>
    <h2 class="heading settled" data-level="3" id="cmaf"><span class="secno">3. </span><span class="content">CMAF AV1 track format</span><a class="self-link" href="#cmaf"></a></h2>
-   <p><a data-link-type="biblio" href="#biblio-cmaf" title="Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media">[CMAF]</a> defines structural constraints on ISOBMFF files additional to <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a> for the purpose of, for example, adaptive streaming or for protected files. Conformance to these structural constraints is signaled by the presence of the brand <code><a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="ref-for-something①⑨">cmfc</a></code> in the <code>FileTypeBox</code>.</p>
-   <p>If a <a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="ref-for-something②⓪">CMAF Video Track</a> uses the brand <code>av01</code>, it is called a <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="cmaf-av1-track">CMAF AV1 Track</dfn> and the following constraints, defining the CMAF Media Profile for AV1, apply:</p>
+   <p><a data-link-type="biblio" href="#biblio-cmaf" title="Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media">[CMAF]</a> defines structural constraints on ISOBMFF files additional to <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a> for the purpose of, for example, adaptive streaming or for protected files. Conformance to these structural constraints is signaled by the presence of the brand <code><a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="ref-for-1568b5183e757fdee5323510bdd1a120">cmfc</a></code> in the <code>FileTypeBox</code>.</p>
+   <p>If a <a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="ref-for-1568b5183e757fdee5323510bdd1a120①">CMAF Video Track</a> uses the brand <code>av01</code>, it is called a <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="cmaf-av1-track">CMAF AV1 Track</dfn> and the following constraints, defining the CMAF Media Profile for AV1, apply:</p>
    <ul>
     <li data-md><span id="assert-f261aa51">it SHALL use an <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry④">AV1SampleEntry</a></span> 
     <li data-md>
@@ -2357,7 +2302,7 @@ <h2 class="heading settled" data-level="3" id="cmaf"><span class="secno">3. </sp
    </ul>
     <span id="assert-7250f9ce">When protected, <a data-link-type="dfn" href="#cmaf-av1-track" id="ref-for-cmaf-av1-track">CMAF AV1 Tracks</a> SHALL use the signaling defined in <a data-link-type="biblio" href="#biblio-cmaf" title="Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media">[CMAF]</a>, which in turn relies on <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a>, with the provisions specified in <a href="#CommonEncryption">§ 4 Common Encryption</a></span>. 
    <h2 class="heading settled" data-level="4" id="CommonEncryption"><span class="secno">4. </span><span class="content">Common Encryption</span><a class="self-link" href="#CommonEncryption"></a></h2>
-    <span id="assert-6eb63a07"><a data-link-type="dfn" href="#cmaf-av1-track" id="ref-for-cmaf-av1-track①">CMAF AV1 Tracks</a> and non-segmented AV1 files MAY be protected</span>. <span id="assert-89e67c25">If protected, they SHALL conform to <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a></span>. <span id="assert-2a42f17e">Files SHOULD be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②①">cbcs</a></code> protection scheme</span> and <span id="assert-105dfb43">MAY be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②②">cenc</a></code> protection scheme</span>. <span id="assert-44221cba">When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②③">cenc</a></code> is used, samples SHALL be protected using subsample encryption</span> and <span id="assert-aa4aefdb">SHALL NOT use pattern encryption</span>. <span id="assert-0113b336">When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②④">cbcs</a></code> is used, samples SHALL be protected using subsample encryption</span> and <span id="assert-95fbc893">SHALL use pattern encryption</span>. <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a> recommends that the Block Pattern length be 10, i.e. <code>crypt_byte_block + skip_byte_block = 10</code>, where a Block is of size 16-bytes. In this specification, the combination of <code>crypt_byte_block</code> and <code>skip_byte_block</code> SHALL be one of the following, with the first one being recommended: 
+    <span id="assert-6eb63a07"><a data-link-type="dfn" href="#cmaf-av1-track" id="ref-for-cmaf-av1-track①">CMAF AV1 Tracks</a> and non-segmented AV1 files MAY be protected</span>. <span id="assert-89e67c25">If protected, they SHALL conform to <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a></span>. <span id="assert-2a42f17e">Files SHOULD be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f">cbcs</a></code> protection scheme</span> and <span id="assert-105dfb43">MAY be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①">cenc</a></code> protection scheme</span>. <span id="assert-44221cba">When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f②">cenc</a></code> is used, samples SHALL be protected using subsample encryption</span> and <span id="assert-aa4aefdb">SHALL NOT use pattern encryption</span>. <span id="assert-0113b336">When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f③">cbcs</a></code> is used, samples SHALL be protected using subsample encryption</span> and <span id="assert-95fbc893">SHALL use pattern encryption</span>. <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a> recommends that the Block Pattern length be 10, i.e. <code>crypt_byte_block + skip_byte_block = 10</code>, where a Block is of size 16-bytes. In this specification, the combination of <code>crypt_byte_block</code> and <code>skip_byte_block</code> SHALL be one of the following, with the first one being recommended: 
    <ul>
     <li data-md><span id="assert-51e8a94d"><code>crypt_byte_block = 1</code> and <code>skip_byte_block = 9</code></span>, 
     <li data-md><span id="assert-973b126b"><code>crypt_byte_block = 5</code> and <code>skip_byte_block = 5</code></span>, 
@@ -2370,7 +2315,7 @@ <h3 class="heading settled" data-level="4.1" id="subsample-encryption"><span cla
      <span id="assert-d84cddee">Protected samples SHALL be exactly spanned by one or more contiguous subsamples</span>. 
      <ul>
       <li data-md><span id="assert-38a31899">An OBU MAY be spanned by one or more subsamples</span>, especially when it has multiple ranges of protected data. However, as recommended in <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a>, writers SHOULD reduce the number of subsamples as possible. This can be achieved by using a subsample that spans multiple consecutive unprotected OBUs as well as the first unprotected and protected parts of the following protected OBU, if such protected OBU exists. 
-      <li data-md><span id="assert-02d6b0e9">A large unprotected OBU whose data size is larger than the maximum size of a single <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②⑤">BytesOfClearData</a> field MAY be spanned by multiple subsamples with zero size <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②⑥">BytesOfProtectedData</a></span>. 
+      <li data-md><span id="assert-02d6b0e9">A large unprotected OBU whose data size is larger than the maximum size of a single <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f④">BytesOfClearData</a> field MAY be spanned by multiple subsamples with zero size <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑤">BytesOfProtectedData</a></span>. 
      </ul>
     <li data-md><span id="assert-b8cabcad">All <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40" id="ref-for-page=40①">OBU Headers</a> and associated <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑥">obu_size</a> fields SHALL be unprotected</span>. 
     <li data-md><span id="assert-4b9592fb"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑨">Temporal Delimiter OBUs</a>, <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑧">Sequence Header OBUs</a>, and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49②">Frame Header OBUs</a> (including within a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71">Frame OBU</a>), <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121①">Redundant Frame Header OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121②">Padding OBUs</a> SHALL be unprotected</span>. 
@@ -2379,25 +2324,25 @@ <h3 class="heading settled" data-level="4.1" id="subsample-encryption"><span cla
      <span id="assert-8750fa6f"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71①">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71②">Frame OBUs</a> SHALL be protected</span>. Within <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71③">Tile Group OBUs</a> or <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71④">Frame OBUs</a>, the following applies: 
      <ul>
       <li data-md>
-       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②⑦">cbcs</a></code>:</p>
+       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑥">cbcs</a></code>:</p>
        <ul>
-        <li data-md><span id="assert-61f691fe"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②⑧">BytesOfProtectedData</a> SHALL start on the first byte and end on the last byte of the <code>decode_tile</code> structure (including any trailing bits)</span>. 
+        <li data-md><span id="assert-61f691fe"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑦">BytesOfProtectedData</a> SHALL start on the first byte and end on the last byte of the <code>decode_tile</code> structure (including any trailing bits)</span>. 
        </ul>
-       <p class="note" role="note"><span class="marker">NOTE:</span> As a result of the above, <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②⑨">BytesOfProtectedData</a> is not necessarily a multiple of 16 bytes and partial blocks are included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③⓪">BytesOfProtectedData</a> range, but per <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a> the data is not be encrypted.</p>
+       <p class="note" role="note"><span class="marker">NOTE:</span> As a result of the above, <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑧">BytesOfProtectedData</a> is not necessarily a multiple of 16 bytes and partial blocks are included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑨">BytesOfProtectedData</a> range, but per <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a> the data is not be encrypted.</p>
        <ul>
         <li data-md><span id="assert-6547e5e3">A subsample SHALL be created for each tile, even if its size is less than 16 bytes</span>. 
         <li data-md><span id="assert-606a0a3a">All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑤">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑥">Frame OBUs</a> SHALL be unprotected</span>. 
        </ul>
       <li data-md>
-       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③①">cenc</a></code>:</p>
+       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①⓪">cenc</a></code>:</p>
        <ul>
-        <li data-md><span id="assert-da5e71ae"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③②">BytesOfProtectedData</a> SHALL be a multiple of 16 bytes</span>. 
-        <li data-md><span id="assert-839432b2"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③③">BytesOfProtectedData</a> SHALL end on the last byte of the <code>decode_tile</code> structure (including any trailing bits)</span>. 
-        <li data-md><span id="assert-b9de48fc"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③④">BytesOfProtectedData</a> SHALL span all complete 16-byte blocks of the <code>decode_tile</code> structure (including any trailing bits)</span>. 
+        <li data-md><span id="assert-da5e71ae"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①①">BytesOfProtectedData</a> SHALL be a multiple of 16 bytes</span>. 
+        <li data-md><span id="assert-839432b2"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①②">BytesOfProtectedData</a> SHALL end on the last byte of the <code>decode_tile</code> structure (including any trailing bits)</span>. 
+        <li data-md><span id="assert-b9de48fc"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①③">BytesOfProtectedData</a> SHALL span all complete 16-byte blocks of the <code>decode_tile</code> structure (including any trailing bits)</span>. 
        </ul>
-       <p class="note" role="note"><span class="marker">NOTE:</span> As a result of the above, partial blocks are not used and it is possible that <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③⑤">BytesOfProtectedData</a> does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.</p>
+       <p class="note" role="note"><span class="marker">NOTE:</span> As a result of the above, partial blocks are not used and it is possible that <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①④">BytesOfProtectedData</a> does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.</p>
        <ul>
-        <li data-md><span id="assert-df6aa49f">A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes</span>. <span id="assert-e145e592">If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③⑥">BytesOfClearData</a> field of a surrounding subsample, if any</span>. 
+        <li data-md><span id="assert-df6aa49f">A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes</span>. <span id="assert-e145e592">If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①⑤">BytesOfClearData</a> field of a surrounding subsample, if any</span>. 
         <li data-md><span id="assert-606a0a3a">All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑦">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑧">Frame OBUs</a> SHALL be unprotected</span>. 
        </ul>
      </ul>
@@ -2409,7 +2354,7 @@ <h3 class="heading settled" data-level="4.2" id="subsample-encryption-illustrati
     <figcaption>Subsample-based AV1 encryption.</figcaption>
    </figure>
    <h2 class="heading settled" data-level="5" id="codecsparam"><span class="secno">5. </span><span class="content">Codecs Parameter String</span><a class="self-link" href="#codecsparam"></a></h2>
-   <p>DASH and other applications require defined values for the <a class="property css" data-link-type="property" href="https://tools.ietf.org/html/rfc6381#" id="ref-for-something③⑦">Codecs</a> parameter specified in <a data-link-type="biblio" href="#biblio-rfc6381" title="The &apos;Codecs&apos; and &apos;Profiles&apos; Parameters for &quot;Bucket&quot; Media Types">[RFC6381]</a> for ISO Media tracks. The codecs parameter string for the AOM AV1 codec is as follows:</p>
+   <p>DASH and other applications require defined values for the <a class="property css" data-link-type="property" href="https://tools.ietf.org/html/rfc6381#" id="ref-for-df8441526d3bbb5086bd93c1fae005b3">Codecs</a> parameter specified in <a data-link-type="biblio" href="#biblio-rfc6381" title="The &apos;Codecs&apos; and &apos;Profiles&apos; Parameters for &quot;Bucket&quot; Media Types">[RFC6381]</a> for ISO Media tracks. The codecs parameter string for the AOM AV1 codec is as follows:</p>
 <pre>&lt;sample entry 4CC>.&lt;profile>.&lt;level>&lt;tier>.&lt;bitDepth>.&lt;monochrome>.&lt;chromaSubsampling>.
 &lt;colorPrimaries>.&lt;transferCharacteristics>.&lt;matrixCoefficients>.&lt;videoFullRangeFlag>
 </pre>
@@ -2636,88 +2581,581 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#version">version</a><span>, in § 2.3.4</span>
    <li><a href="#width">width</a><span>, in § 2.2.4</span>
   </ul>
+  <aside aria-labelledby="infopaneltitle-for-f03adbccd0f71dbd64db6303812028fa" class="dfn-panel" data-for="f03adbccd0f71dbd64db6303812028fa" id="infopanel-for-f03adbccd0f71dbd64db6303812028fa">
+   <span id="infopaneltitle-for-f03adbccd0f71dbd64db6303812028fa" style="display:none">Info about the 'av1 bitstream' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=1">1. Bitstream features overview</a>
+    <li><a href="#ref-for-page=1①">2. Basic Encapsulation Scheme</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-3832a1720800015cee7b0703f7328c35" class="dfn-panel" data-for="3832a1720800015cee7b0703f7328c35" id="infopanel-for-3832a1720800015cee7b0703f7328c35">
+   <span id="infopaneltitle-for-3832a1720800015cee7b0703f7328c35" style="display:none">Info about the 'buffer_removal_time' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-559078660a67169a7db62632f96f0f56" class="dfn-panel" data-for="559078660a67169a7db62632f96f0f56" id="infopanel-for-559078660a67169a7db62632f96f0f56">
+   <span id="infopaneltitle-for-559078660a67169a7db62632f96f0f56" style="display:none">Info about the 'color_config' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=44">2.3.4. Semantics</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-ffd6a013c385ccb5c6974a36f39c9419" class="dfn-panel" data-for="ffd6a013c385ccb5c6974a36f39c9419" id="infopanel-for-ffd6a013c385ccb5c6974a36f39c9419">
+   <span id="infopaneltitle-for-ffd6a013c385ccb5c6974a36f39c9419" style="display:none">Info about the 'delayed random access point' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=206">1. Bitstream features overview</a> <a href="#ref-for-page=206①">(2)</a> <a href="#ref-for-page=206②">(3)</a> <a href="#ref-for-page=206③">(4)</a> <a href="#ref-for-page=206④">(5)</a> <a href="#ref-for-page=206⑤">(6)</a> <a href="#ref-for-page=206⑥">(7)</a>
+    <li><a href="#ref-for-page=206⑦">2.4. AV1 Sample Format</a>
+    <li><a href="#ref-for-page=206⑧">2.5.2. Description</a> <a href="#ref-for-page=206⑨">(2)</a>
+    <li><a href="#ref-for-page=206①⓪">2.5.4. Semantics</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-d58adec65fc7472c4103fc0ce48ffad2" class="dfn-panel" data-for="d58adec65fc7472c4103fc0ce48ffad2" id="infopanel-for-d58adec65fc7472c4103fc0ce48ffad2">
+   <span id="infopaneltitle-for-d58adec65fc7472c4103fc0ce48ffad2" style="display:none">Info about the 'frame header obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=49">2.3.4. Semantics</a>
+    <li><a href="#ref-for-page=49①">2.4. AV1 Sample Format</a>
+    <li><a href="#ref-for-page=49②">4.1. General Subsample Encryption constraints</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-61cc567b8d2c37a5482c59baafb6b8ff" class="dfn-panel" data-for="61cc567b8d2c37a5482c59baafb6b8ff" id="infopanel-for-61cc567b8d2c37a5482c59baafb6b8ff">
+   <span id="infopaneltitle-for-61cc567b8d2c37a5482c59baafb6b8ff" style="display:none">Info about the 'frame obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=71">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=71①">(2)</a> <a href="#ref-for-page=71②">(3)</a> <a href="#ref-for-page=71③">(4)</a> <a href="#ref-for-page=71④">(5)</a> <a href="#ref-for-page=71⑤">(6)</a> <a href="#ref-for-page=71⑥">(7)</a> <a href="#ref-for-page=71⑦">(8)</a> <a href="#ref-for-page=71⑧">(9)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-44bda72a7faed4e3816a653629cc8043" class="dfn-panel" data-for="44bda72a7faed4e3816a653629cc8043" id="infopanel-for-44bda72a7faed4e3816a653629cc8043">
+   <span id="infopaneltitle-for-44bda72a7faed4e3816a653629cc8043" style="display:none">Info about the 'frame_presentation_time' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-8720e7b90737c186d54125451a6578c3" class="dfn-panel" data-for="8720e7b90737c186d54125451a6578c3" id="infopanel-for-8720e7b90737c186d54125451a6578c3">
+   <span id="infopaneltitle-for-8720e7b90737c186d54125451a6578c3" style="display:none">Info about the 'initial_display_delay_minus_1' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-320f0b8648b2c86937bd5df124c0721c" class="dfn-panel" data-for="320f0b8648b2c86937bd5df124c0721c" id="infopanel-for-320f0b8648b2c86937bd5df124c0721c">
+   <span id="infopaneltitle-for-320f0b8648b2c86937bd5df124c0721c" style="display:none">Info about the 'inter frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
+    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
+    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-48602d12010b460d62666543107dbb8c" class="dfn-panel" data-for="48602d12010b460d62666543107dbb8c" id="infopanel-for-48602d12010b460d62666543107dbb8c">
+   <span id="infopaneltitle-for-48602d12010b460d62666543107dbb8c" style="display:none">Info about the 'intra-only frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
+    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
+    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-f8cc04bc4613acfd789110ae277063a3" class="dfn-panel" data-for="f8cc04bc4613acfd789110ae277063a3" id="infopanel-for-f8cc04bc4613acfd789110ae277063a3">
+   <span id="infopaneltitle-for-f8cc04bc4613acfd789110ae277063a3" style="display:none">Info about the 'key frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
+    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
+    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-295ffdcbb0b3062ed4b9d6391d6555f8" class="dfn-panel" data-for="295ffdcbb0b3062ed4b9d6391d6555f8" id="infopanel-for-295ffdcbb0b3062ed4b9d6391d6555f8">
+   <span id="infopaneltitle-for-295ffdcbb0b3062ed4b9d6391d6555f8" style="display:none">Info about the 'key frame dependent recovery point' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=206">1. Bitstream features overview</a> <a href="#ref-for-page=206①">(2)</a> <a href="#ref-for-page=206②">(3)</a> <a href="#ref-for-page=206③">(4)</a> <a href="#ref-for-page=206④">(5)</a> <a href="#ref-for-page=206⑤">(6)</a> <a href="#ref-for-page=206⑥">(7)</a>
+    <li><a href="#ref-for-page=206⑦">2.4. AV1 Sample Format</a>
+    <li><a href="#ref-for-page=206⑧">2.5.2. Description</a> <a href="#ref-for-page=206⑨">(2)</a>
+    <li><a href="#ref-for-page=206①⓪">2.5.4. Semantics</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-effc5260e6921d7355a31efe9e581f5e" class="dfn-panel" data-for="effc5260e6921d7355a31efe9e581f5e" id="infopanel-for-effc5260e6921d7355a31efe9e581f5e">
+   <span id="infopaneltitle-for-effc5260e6921d7355a31efe9e581f5e" style="display:none">Info about the 'low overhead bitstream format' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=39">1. Bitstream features overview</a>
+    <li><a href="#ref-for-page=39①">2.3.4. Semantics</a>
+    <li><a href="#ref-for-page=39②">2.4. AV1 Sample Format</a> <a href="#ref-for-page=39③">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-2f273a655f76900606361284b223527c" class="dfn-panel" data-for="2f273a655f76900606361284b223527c" id="infopanel-for-2f273a655f76900606361284b223527c">
+   <span id="infopaneltitle-for-2f273a655f76900606361284b223527c" style="display:none">Info about the 'max_frame_height_minus_1' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-607e04e0caddfe3e61efb6ea8770130c" class="dfn-panel" data-for="607e04e0caddfe3e61efb6ea8770130c" id="infopanel-for-607e04e0caddfe3e61efb6ea8770130c">
+   <span id="infopaneltitle-for-607e04e0caddfe3e61efb6ea8770130c" style="display:none">Info about the 'max_frame_width_minus_1' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-cd1fdf90baa77d8296625f83349a558c" class="dfn-panel" data-for="cd1fdf90baa77d8296625f83349a558c" id="infopanel-for-cd1fdf90baa77d8296625f83349a558c">
+   <span id="infopaneltitle-for-cd1fdf90baa77d8296625f83349a558c" style="display:none">Info about the 'metadata obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=46">2.3.4. Semantics</a> <a href="#ref-for-page=46①">(2)</a>
+    <li><a href="#ref-for-page=46②">2.4. AV1 Sample Format</a> <a href="#ref-for-page=46③">(2)</a> <a href="#ref-for-page=46④">(3)</a> <a href="#ref-for-page=46⑤">(4)</a>
+    <li><a href="#ref-for-page=46⑥">2.8.2. Description</a> <a href="#ref-for-page=46⑦">(2)</a> <a href="#ref-for-page=46⑧">(3)</a>
+    <li><a href="#ref-for-page=46⑨">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=46①⓪">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-eb0782dfea22c80ac75d63b45a421c45" class="dfn-panel" data-for="eb0782dfea22c80ac75d63b45a421c45" id="infopanel-for-eb0782dfea22c80ac75d63b45a421c45">
+   <span id="infopaneltitle-for-eb0782dfea22c80ac75d63b45a421c45" style="display:none">Info about the 'mono_chrome' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-fad0316db590b5b97f2a78eea1a20567" class="dfn-panel" data-for="fad0316db590b5b97f2a78eea1a20567" id="infopanel-for-fad0316db590b5b97f2a78eea1a20567">
+   <span id="infopaneltitle-for-fad0316db590b5b97f2a78eea1a20567" style="display:none">Info about the 'obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=39">1. Bitstream features overview</a>
+    <li><a href="#ref-for-page=39①">2.3.4. Semantics</a>
+    <li><a href="#ref-for-page=39②">2.4. AV1 Sample Format</a> <a href="#ref-for-page=39③">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-bcf179fe5dc66841b8ee6f4bf7024547" class="dfn-panel" data-for="bcf179fe5dc66841b8ee6f4bf7024547" id="infopanel-for-bcf179fe5dc66841b8ee6f4bf7024547">
+   <span id="infopaneltitle-for-bcf179fe5dc66841b8ee6f4bf7024547" style="display:none">Info about the 'obu header' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=40">2.3.4. Semantics</a>
+    <li><a href="#ref-for-page=40①">4.1. General Subsample Encryption constraints</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-f9c9cd91bc5ff3e8007f3109e4172022" class="dfn-panel" data-for="f9c9cd91bc5ff3e8007f3109e4172022" id="infopanel-for-f9c9cd91bc5ff3e8007f3109e4172022">
+   <span id="infopaneltitle-for-f9c9cd91bc5ff3e8007f3109e4172022" style="display:none">Info about the 'obu_has_size_field' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-ae8c5a5a2224e16c570d1c72ed7f9ca3" class="dfn-panel" data-for="ae8c5a5a2224e16c570d1c72ed7f9ca3" id="infopanel-for-ae8c5a5a2224e16c570d1c72ed7f9ca3">
+   <span id="infopaneltitle-for-ae8c5a5a2224e16c570d1c72ed7f9ca3" style="display:none">Info about the 'obu_size' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-f41c7b6b409e9137c8b46b0e8192eae7" class="dfn-panel" data-for="f41c7b6b409e9137c8b46b0e8192eae7" id="infopanel-for-f41c7b6b409e9137c8b46b0e8192eae7">
+   <span id="infopaneltitle-for-f41c7b6b409e9137c8b46b0e8192eae7" style="display:none">Info about the 'open_bitstream_unit' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-cb42042994dfc555541c6d2a5b7ac21c" class="dfn-panel" data-for="cb42042994dfc555541c6d2a5b7ac21c" id="infopanel-for-cb42042994dfc555541c6d2a5b7ac21c">
+   <span id="infopaneltitle-for-cb42042994dfc555541c6d2a5b7ac21c" style="display:none">Info about the 'padding obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=121">1. Bitstream features overview</a>
+    <li><a href="#ref-for-page=121①">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=121②">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-2a14dd3c3618065abd5e1df01cd526ce" class="dfn-panel" data-for="2a14dd3c3618065abd5e1df01cd526ce" id="infopanel-for-2a14dd3c3618065abd5e1df01cd526ce">
+   <span id="infopaneltitle-for-2a14dd3c3618065abd5e1df01cd526ce" style="display:none">Info about the 'random access point' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=206">1. Bitstream features overview</a> <a href="#ref-for-page=206①">(2)</a> <a href="#ref-for-page=206②">(3)</a> <a href="#ref-for-page=206③">(4)</a> <a href="#ref-for-page=206④">(5)</a> <a href="#ref-for-page=206⑤">(6)</a> <a href="#ref-for-page=206⑥">(7)</a>
+    <li><a href="#ref-for-page=206⑦">2.4. AV1 Sample Format</a>
+    <li><a href="#ref-for-page=206⑧">2.5.2. Description</a> <a href="#ref-for-page=206⑨">(2)</a>
+    <li><a href="#ref-for-page=206①⓪">2.5.4. Semantics</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-49d4b1324b3e6175214f1de9258652c0" class="dfn-panel" data-for="49d4b1324b3e6175214f1de9258652c0" id="infopanel-for-49d4b1324b3e6175214f1de9258652c0">
+   <span id="infopaneltitle-for-49d4b1324b3e6175214f1de9258652c0" style="display:none">Info about the 'redundant frame header obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=121">1. Bitstream features overview</a>
+    <li><a href="#ref-for-page=121①">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=121②">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-6af483fb580bc8cd300825f157ed0f23" class="dfn-panel" data-for="6af483fb580bc8cd300825f157ed0f23" id="infopanel-for-6af483fb580bc8cd300825f157ed0f23">
+   <span id="infopaneltitle-for-6af483fb580bc8cd300825f157ed0f23" style="display:none">Info about the 'seq_level_idx' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-8c994b92162ebe7ad58fd07f5c951f12" class="dfn-panel" data-for="8c994b92162ebe7ad58fd07f5c951f12" id="infopanel-for-8c994b92162ebe7ad58fd07f5c951f12">
+   <span id="infopaneltitle-for-8c994b92162ebe7ad58fd07f5c951f12" style="display:none">Info about the 'seq_tier' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-0eb96964e5fc585c9760f0cc0f7aa6c3" class="dfn-panel" data-for="0eb96964e5fc585c9760f0cc0f7aa6c3" id="infopanel-for-0eb96964e5fc585c9760f0cc0f7aa6c3">
+   <span id="infopaneltitle-for-0eb96964e5fc585c9760f0cc0f7aa6c3" style="display:none">Info about the 'sequence header obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=41">2.2.4. Semantics</a> <a href="#ref-for-page=41①">(2)</a>
+    <li><a href="#ref-for-page=41②">2.3.4. Semantics</a> <a href="#ref-for-page=41③">(2)</a> <a href="#ref-for-page=41④">(3)</a> <a href="#ref-for-page=41⑤">(4)</a> <a href="#ref-for-page=41⑥">(5)</a> <a href="#ref-for-page=41⑦">(6)</a> <a href="#ref-for-page=41⑧">(7)</a> <a href="#ref-for-page=41⑨">(8)</a> <a href="#ref-for-page=41①⓪">(9)</a> <a href="#ref-for-page=41①①">(10)</a> <a href="#ref-for-page=41①②">(11)</a> <a href="#ref-for-page=41①③">(12)</a> <a href="#ref-for-page=41①④">(13)</a> <a href="#ref-for-page=41①⑤">(14)</a> <a href="#ref-for-page=41①⑥">(15)</a> <a href="#ref-for-page=41①⑦">(16)</a> <a href="#ref-for-page=41①⑧">(17)</a> <a href="#ref-for-page=41①⑨">(18)</a> <a href="#ref-for-page=41②⓪">(19)</a> <a href="#ref-for-page=41②①">(20)</a> <a href="#ref-for-page=41②②">(21)</a> <a href="#ref-for-page=41②③">(22)</a> <a href="#ref-for-page=41②④">(23)</a> <a href="#ref-for-page=41②⑤">(24)</a>
+    <li><a href="#ref-for-page=41②⑥">2.4. AV1 Sample Format</a> <a href="#ref-for-page=41②⑦">(2)</a>
+    <li><a href="#ref-for-page=41②⑧">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=41②⑨">5. Codecs Parameter String</a> <a href="#ref-for-page=41③⓪">(2)</a> <a href="#ref-for-page=41③①">(3)</a> <a href="#ref-for-page=41③②">(4)</a> <a href="#ref-for-page=41③③">(5)</a> <a href="#ref-for-page=41③④">(6)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-8ee84de303b43ec62bb21bf9598287a4" class="dfn-panel" data-for="8ee84de303b43ec62bb21bf9598287a4" id="infopanel-for-8ee84de303b43ec62bb21bf9598287a4">
+   <span id="infopaneltitle-for-8ee84de303b43ec62bb21bf9598287a4" style="display:none">Info about the 'show_existing_frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-6ab350adb6a8d151ef893c148883c990" class="dfn-panel" data-for="6ab350adb6a8d151ef893c148883c990" id="infopanel-for-6ab350adb6a8d151ef893c148883c990">
+   <span id="infopaneltitle-for-6ab350adb6a8d151ef893c148883c990" style="display:none">Info about the 'show_frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-006a3bf07dac848d227cff3f097563c8" class="dfn-panel" data-for="006a3bf07dac848d227cff3f097563c8" id="infopanel-for-006a3bf07dac848d227cff3f097563c8">
+   <span id="infopaneltitle-for-006a3bf07dac848d227cff3f097563c8" style="display:none">Info about the 'subsampling_x' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-eb7fc80c7183639b2fdb78f61ce55a11" class="dfn-panel" data-for="eb7fc80c7183639b2fdb78f61ce55a11" id="infopanel-for-eb7fc80c7183639b2fdb78f61ce55a11">
+   <span id="infopaneltitle-for-eb7fc80c7183639b2fdb78f61ce55a11" style="display:none">Info about the 'subsampling_y' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-8a2bfdfe0bd189daf691bcd702fe8795" class="dfn-panel" data-for="8a2bfdfe0bd189daf691bcd702fe8795" id="infopanel-for-8a2bfdfe0bd189daf691bcd702fe8795">
+   <span id="infopaneltitle-for-8a2bfdfe0bd189daf691bcd702fe8795" style="display:none">Info about the 'switch frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
+    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
+    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-e07ec093ac0a6bd7e497becb0e4dedc1" class="dfn-panel" data-for="e07ec093ac0a6bd7e497becb0e4dedc1" id="infopanel-for-e07ec093ac0a6bd7e497becb0e4dedc1">
+   <span id="infopaneltitle-for-e07ec093ac0a6bd7e497becb0e4dedc1" style="display:none">Info about the 'temporal delimiter obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=46">2.3.4. Semantics</a> <a href="#ref-for-page=46①">(2)</a>
+    <li><a href="#ref-for-page=46②">2.4. AV1 Sample Format</a> <a href="#ref-for-page=46③">(2)</a> <a href="#ref-for-page=46④">(3)</a> <a href="#ref-for-page=46⑤">(4)</a>
+    <li><a href="#ref-for-page=46⑥">2.8.2. Description</a> <a href="#ref-for-page=46⑦">(2)</a> <a href="#ref-for-page=46⑧">(3)</a>
+    <li><a href="#ref-for-page=46⑨">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=46①⓪">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-d71db54f0eeaab45d4615cfd2ca2de3d" class="dfn-panel" data-for="d71db54f0eeaab45d4615cfd2ca2de3d" id="infopanel-for-d71db54f0eeaab45d4615cfd2ca2de3d">
+   <span id="infopaneltitle-for-d71db54f0eeaab45d4615cfd2ca2de3d" style="display:none">Info about the 'temporal unit' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
+    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
+    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-d85adcf672535355b6f59f8ae2a7f312" class="dfn-panel" data-for="d85adcf672535355b6f59f8ae2a7f312" id="infopanel-for-d85adcf672535355b6f59f8ae2a7f312">
+   <span id="infopaneltitle-for-d85adcf672535355b6f59f8ae2a7f312" style="display:none">Info about the 'tile group obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=71">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=71①">(2)</a> <a href="#ref-for-page=71②">(3)</a> <a href="#ref-for-page=71③">(4)</a> <a href="#ref-for-page=71④">(5)</a> <a href="#ref-for-page=71⑤">(6)</a> <a href="#ref-for-page=71⑥">(7)</a> <a href="#ref-for-page=71⑦">(8)</a> <a href="#ref-for-page=71⑧">(9)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-f22120bb18bc0c18d65d82eeeca12326" class="dfn-panel" data-for="f22120bb18bc0c18d65d82eeeca12326" id="infopanel-for-f22120bb18bc0c18d65d82eeeca12326">
+   <span id="infopaneltitle-for-f22120bb18bc0c18d65d82eeeca12326" style="display:none">Info about the 'tile list obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=121">1. Bitstream features overview</a>
+    <li><a href="#ref-for-page=121①">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=121②">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-0bf077100eb0b617c5b8accac3f316c4" class="dfn-panel" data-for="0bf077100eb0b617c5b8accac3f316c4" id="infopanel-for-0bf077100eb0b617c5b8accac3f316c4">
+   <span id="infopaneltitle-for-0bf077100eb0b617c5b8accac3f316c4" style="display:none">Info about the 'timing_info' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=45">2.3.4. Semantics</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-b23305d39492fb7d58d912b81e05ff07" class="dfn-panel" data-for="b23305d39492fb7d58d912b81e05ff07" id="infopanel-for-b23305d39492fb7d58d912b81e05ff07">
+   <span id="infopaneltitle-for-b23305d39492fb7d58d912b81e05ff07" style="display:none">Info about the 'timing_info_present_flag' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-935be28bb2ef232ad16945b2cdb69c0f" class="dfn-panel" data-for="935be28bb2ef232ad16945b2cdb69c0f" id="infopanel-for-935be28bb2ef232ad16945b2cdb69c0f">
+   <span id="infopaneltitle-for-935be28bb2ef232ad16945b2cdb69c0f" style="display:none">Info about the 'bytesofcleardata' external reference.</span><a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4. Common Encryption</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a>
+    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(5)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(6)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(7)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(8)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(9)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(10)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(11)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(12)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-0823905e938db14fa0ce9f54969cea70" class="dfn-panel" data-for="0823905e938db14fa0ce9f54969cea70" id="infopanel-for-0823905e938db14fa0ce9f54969cea70">
+   <span id="infopaneltitle-for-0823905e938db14fa0ce9f54969cea70" style="display:none">Info about the 'bytesofprotecteddata' external reference.</span><a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4. Common Encryption</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a>
+    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(5)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(6)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(7)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(8)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(9)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(10)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(11)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(12)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-2b285af7abdae2d4aab3a7cbedfdd6ab" class="dfn-panel" data-for="2b285af7abdae2d4aab3a7cbedfdd6ab" id="infopanel-for-2b285af7abdae2d4aab3a7cbedfdd6ab">
+   <span id="infopaneltitle-for-2b285af7abdae2d4aab3a7cbedfdd6ab" style="display:none">Info about the 'cbcs' external reference.</span><a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4. Common Encryption</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a>
+    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(5)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(6)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(7)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(8)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(9)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(10)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(11)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(12)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-742c038dd8361327983a92bd81e21859" class="dfn-panel" data-for="742c038dd8361327983a92bd81e21859" id="infopanel-for-742c038dd8361327983a92bd81e21859">
+   <span id="infopaneltitle-for-742c038dd8361327983a92bd81e21859" style="display:none">Info about the 'cenc' external reference.</span><a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4. Common Encryption</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a>
+    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(5)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(6)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(7)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(8)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(9)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(10)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(11)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(12)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-1568b5183e757fdee5323510bdd1a120" class="dfn-panel" data-for="1568b5183e757fdee5323510bdd1a120" id="infopanel-for-1568b5183e757fdee5323510bdd1a120">
+   <span id="infopaneltitle-for-1568b5183e757fdee5323510bdd1a120" style="display:none">Info about the 'cmaf video track' external reference.</span><a href="https://www.iso.org/standard/71975.html#">https://www.iso.org/standard/71975.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-1568b5183e757fdee5323510bdd1a120">3. CMAF AV1 track format</a> <a href="#ref-for-1568b5183e757fdee5323510bdd1a120">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-76fc7918b57ae33e76892402603c6b72" class="dfn-panel" data-for="76fc7918b57ae33e76892402603c6b72" id="infopanel-for-76fc7918b57ae33e76892402603c6b72">
+   <span id="infopaneltitle-for-76fc7918b57ae33e76892402603c6b72" style="display:none">Info about the 'cmfc' external reference.</span><a href="https://www.iso.org/standard/71975.html#">https://www.iso.org/standard/71975.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-1568b5183e757fdee5323510bdd1a120">3. CMAF AV1 track format</a> <a href="#ref-for-1568b5183e757fdee5323510bdd1a120">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-952f01526c87045a89015e38d1931006" class="dfn-panel" data-for="952f01526c87045a89015e38d1931006" id="infopanel-for-952f01526c87045a89015e38d1931006">
+   <span id="infopaneltitle-for-952f01526c87045a89015e38d1931006" style="display:none">Info about the 'bitr' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-52b8fcc7cef8754159148e684a77d02e" class="dfn-panel" data-for="52b8fcc7cef8754159148e684a77d02e" id="infopanel-for-52b8fcc7cef8754159148e684a77d02e">
+   <span id="infopaneltitle-for-52b8fcc7cef8754159148e684a77d02e" style="display:none">Info about the 'clap' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-15388b1662efccc6c0d26daa21eb8a02" class="dfn-panel" data-for="15388b1662efccc6c0d26daa21eb8a02" id="infopanel-for-15388b1662efccc6c0d26daa21eb8a02">
+   <span id="infopaneltitle-for-15388b1662efccc6c0d26daa21eb8a02" style="display:none">Info about the 'clli' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-6351cd1cc3bfb6561867f56587297705" class="dfn-panel" data-for="6351cd1cc3bfb6561867f56587297705" id="infopanel-for-6351cd1cc3bfb6561867f56587297705">
+   <span id="infopaneltitle-for-6351cd1cc3bfb6561867f56587297705" style="display:none">Info about the 'colr' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-1b1b183a7f9c84aa05248368ea7421ba" class="dfn-panel" data-for="1b1b183a7f9c84aa05248368ea7421ba" id="infopanel-for-1b1b183a7f9c84aa05248368ea7421ba">
+   <span id="infopaneltitle-for-1b1b183a7f9c84aa05248368ea7421ba" style="display:none">Info about the 'ctts' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-295c612b69b22d9306c1004b4766efa2" class="dfn-panel" data-for="295c612b69b22d9306c1004b4766efa2" id="infopanel-for-295c612b69b22d9306c1004b4766efa2">
+   <span id="infopaneltitle-for-295c612b69b22d9306c1004b4766efa2" style="display:none">Info about the 'iso6' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-fcf81bf686786e641e169d84d6f6c84a" class="dfn-panel" data-for="fcf81bf686786e641e169d84d6f6c84a" id="infopanel-for-fcf81bf686786e641e169d84d6f6c84a">
+   <span id="infopaneltitle-for-fcf81bf686786e641e169d84d6f6c84a" style="display:none">Info about the 'mdcv' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-f2de67e75e1151de694a7aedeccb7e6c" class="dfn-panel" data-for="f2de67e75e1151de694a7aedeccb7e6c" id="infopanel-for-f2de67e75e1151de694a7aedeccb7e6c">
+   <span id="infopaneltitle-for-f2de67e75e1151de694a7aedeccb7e6c" style="display:none">Info about the 'nclx' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-d72ed60b4c680fa6477d565e9553dd28" class="dfn-panel" data-for="d72ed60b4c680fa6477d565e9553dd28" id="infopanel-for-d72ed60b4c680fa6477d565e9553dd28">
+   <span id="infopaneltitle-for-d72ed60b4c680fa6477d565e9553dd28" style="display:none">Info about the 'visualsampleentry' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-df8441526d3bbb5086bd93c1fae005b3" class="dfn-panel" data-for="df8441526d3bbb5086bd93c1fae005b3" id="infopanel-for-df8441526d3bbb5086bd93c1fae005b3">
+   <span id="infopaneltitle-for-df8441526d3bbb5086bd93c1fae005b3" style="display:none">Info about the 'codecs' external reference.</span><a href="https://tools.ietf.org/html/rfc6381#">https://tools.ietf.org/html/rfc6381#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-df8441526d3bbb5086bd93c1fae005b3">5. Codecs Parameter String</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-37f26709df4ef02bccacdfb3c0626342" class="dfn-panel" data-for="37f26709df4ef02bccacdfb3c0626342" id="infopanel-for-37f26709df4ef02bccacdfb3c0626342">
+   <span id="infopaneltitle-for-37f26709df4ef02bccacdfb3c0626342" style="display:none">Info about the 'coll' external reference.</span><a href="https://www.webmproject.org/vp9/mp4/#">https://www.webmproject.org/vp9/mp4/#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-37f26709df4ef02bccacdfb3c0626342">2.3.4. Semantics</a> <a href="#ref-for-37f26709df4ef02bccacdfb3c0626342">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-b459180629a753573e7c799ce3a57f45" class="dfn-panel" data-for="b459180629a753573e7c799ce3a57f45" id="infopanel-for-b459180629a753573e7c799ce3a57f45">
+   <span id="infopaneltitle-for-b459180629a753573e7c799ce3a57f45" style="display:none">Info about the 'smdm' external reference.</span><a href="https://www.webmproject.org/vp9/mp4/#">https://www.webmproject.org/vp9/mp4/#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-37f26709df4ef02bccacdfb3c0626342">2.3.4. Semantics</a> <a href="#ref-for-37f26709df4ef02bccacdfb3c0626342">(2)</a>
+   </ul>
+  </aside>
   <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span class="content">Terms defined by reference</span><a class="self-link" href="#index-defined-elsewhere"></a></h3>
   <ul class="index">
    <li>
     <a data-link-type="biblio">[AV1]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="0c2ca1d5">av1 bitstream</span>
-     <li><span class="dfn-paneled" id="37e9fb19">buffer_removal_time</span>
-     <li><span class="dfn-paneled" id="b7ca4bf7">color_config</span>
-     <li><span class="dfn-paneled" id="9d45d75d">delayed random access point</span>
-     <li><span class="dfn-paneled" id="c045a352">frame header obu</span>
-     <li><span class="dfn-paneled" id="831a5a65">frame obu</span>
-     <li><span class="dfn-paneled" id="84de3072">frame_presentation_time</span>
-     <li><span class="dfn-paneled" id="81139bb1">initial_display_delay_minus_1</span>
-     <li><span class="dfn-paneled" id="7edceda2">inter frame</span>
-     <li><span class="dfn-paneled" id="6a4d04ef">intra-only frame</span>
-     <li><span class="dfn-paneled" id="95de707d">key frame</span>
-     <li><span class="dfn-paneled" id="83e6755a">key frame dependent recovery point</span>
-     <li><span class="dfn-paneled" id="8b5d0ee2">low overhead bitstream format</span>
-     <li><span class="dfn-paneled" id="3a5737fd">max_frame_height_minus_1</span>
-     <li><span class="dfn-paneled" id="58ec0510">max_frame_width_minus_1</span>
-     <li><span class="dfn-paneled" id="937ec5c0">metadata obu</span>
-     <li><span class="dfn-paneled" id="50388659">mono_chrome</span>
-     <li><span class="dfn-paneled" id="fdf4231e">obu</span>
-     <li><span class="dfn-paneled" id="b4bb1520">obu header</span>
-     <li><span class="dfn-paneled" id="9c2e006a">obu_has_size_field</span>
-     <li><span class="dfn-paneled" id="c19d5874">obu_size</span>
-     <li><span class="dfn-paneled" id="da136fa8">open_bitstream_unit</span>
-     <li><span class="dfn-paneled" id="2181eb6c">padding obu</span>
-     <li><span class="dfn-paneled" id="6406abdb">random access point</span>
-     <li><span class="dfn-paneled" id="f80f4aa7">redundant frame header obu</span>
-     <li><span class="dfn-paneled" id="48d18ec8">seq_level_idx</span>
-     <li><span class="dfn-paneled" id="9aa97c69">seq_tier</span>
-     <li><span class="dfn-paneled" id="56e458b6">sequence header obu</span>
-     <li><span class="dfn-paneled" id="6879641c">show_existing_frame</span>
-     <li><span class="dfn-paneled" id="6f2bb367">show_frame</span>
-     <li><span class="dfn-paneled" id="029d3141">subsampling_x</span>
-     <li><span class="dfn-paneled" id="1a24c071">subsampling_y</span>
-     <li><span class="dfn-paneled" id="0c507a0f">switch frame</span>
-     <li><span class="dfn-paneled" id="0f7ae3ea">temporal delimiter obu</span>
-     <li><span class="dfn-paneled" id="893e1684">temporal unit</span>
-     <li><span class="dfn-paneled" id="7c08a478">tile group obu</span>
-     <li><span class="dfn-paneled" id="da09075b">tile list obu</span>
-     <li><span class="dfn-paneled" id="48bcea1c">timing_info</span>
-     <li><span class="dfn-paneled" id="f6918f92">timing_info_present_flag</span>
+     <li><span class="dfn-paneled" id="f03adbccd0f71dbd64db6303812028fa">av1 bitstream</span>
+     <li><span class="dfn-paneled" id="3832a1720800015cee7b0703f7328c35">buffer_removal_time</span>
+     <li><span class="dfn-paneled" id="559078660a67169a7db62632f96f0f56">color_config</span>
+     <li><span class="dfn-paneled" id="ffd6a013c385ccb5c6974a36f39c9419">delayed random access point</span>
+     <li><span class="dfn-paneled" id="d58adec65fc7472c4103fc0ce48ffad2">frame header obu</span>
+     <li><span class="dfn-paneled" id="61cc567b8d2c37a5482c59baafb6b8ff">frame obu</span>
+     <li><span class="dfn-paneled" id="44bda72a7faed4e3816a653629cc8043">frame_presentation_time</span>
+     <li><span class="dfn-paneled" id="8720e7b90737c186d54125451a6578c3">initial_display_delay_minus_1</span>
+     <li><span class="dfn-paneled" id="320f0b8648b2c86937bd5df124c0721c">inter frame</span>
+     <li><span class="dfn-paneled" id="48602d12010b460d62666543107dbb8c">intra-only frame</span>
+     <li><span class="dfn-paneled" id="f8cc04bc4613acfd789110ae277063a3">key frame</span>
+     <li><span class="dfn-paneled" id="295ffdcbb0b3062ed4b9d6391d6555f8">key frame dependent recovery point</span>
+     <li><span class="dfn-paneled" id="effc5260e6921d7355a31efe9e581f5e">low overhead bitstream format</span>
+     <li><span class="dfn-paneled" id="2f273a655f76900606361284b223527c">max_frame_height_minus_1</span>
+     <li><span class="dfn-paneled" id="607e04e0caddfe3e61efb6ea8770130c">max_frame_width_minus_1</span>
+     <li><span class="dfn-paneled" id="cd1fdf90baa77d8296625f83349a558c">metadata obu</span>
+     <li><span class="dfn-paneled" id="eb0782dfea22c80ac75d63b45a421c45">mono_chrome</span>
+     <li><span class="dfn-paneled" id="fad0316db590b5b97f2a78eea1a20567">obu</span>
+     <li><span class="dfn-paneled" id="bcf179fe5dc66841b8ee6f4bf7024547">obu header</span>
+     <li><span class="dfn-paneled" id="f9c9cd91bc5ff3e8007f3109e4172022">obu_has_size_field</span>
+     <li><span class="dfn-paneled" id="ae8c5a5a2224e16c570d1c72ed7f9ca3">obu_size</span>
+     <li><span class="dfn-paneled" id="f41c7b6b409e9137c8b46b0e8192eae7">open_bitstream_unit</span>
+     <li><span class="dfn-paneled" id="cb42042994dfc555541c6d2a5b7ac21c">padding obu</span>
+     <li><span class="dfn-paneled" id="2a14dd3c3618065abd5e1df01cd526ce">random access point</span>
+     <li><span class="dfn-paneled" id="49d4b1324b3e6175214f1de9258652c0">redundant frame header obu</span>
+     <li><span class="dfn-paneled" id="6af483fb580bc8cd300825f157ed0f23">seq_level_idx</span>
+     <li><span class="dfn-paneled" id="8c994b92162ebe7ad58fd07f5c951f12">seq_tier</span>
+     <li><span class="dfn-paneled" id="0eb96964e5fc585c9760f0cc0f7aa6c3">sequence header obu</span>
+     <li><span class="dfn-paneled" id="8ee84de303b43ec62bb21bf9598287a4">show_existing_frame</span>
+     <li><span class="dfn-paneled" id="6ab350adb6a8d151ef893c148883c990">show_frame</span>
+     <li><span class="dfn-paneled" id="006a3bf07dac848d227cff3f097563c8">subsampling_x</span>
+     <li><span class="dfn-paneled" id="eb7fc80c7183639b2fdb78f61ce55a11">subsampling_y</span>
+     <li><span class="dfn-paneled" id="8a2bfdfe0bd189daf691bcd702fe8795">switch frame</span>
+     <li><span class="dfn-paneled" id="e07ec093ac0a6bd7e497becb0e4dedc1">temporal delimiter obu</span>
+     <li><span class="dfn-paneled" id="d71db54f0eeaab45d4615cfd2ca2de3d">temporal unit</span>
+     <li><span class="dfn-paneled" id="d85adcf672535355b6f59f8ae2a7f312">tile group obu</span>
+     <li><span class="dfn-paneled" id="f22120bb18bc0c18d65d82eeeca12326">tile list obu</span>
+     <li><span class="dfn-paneled" id="0bf077100eb0b617c5b8accac3f316c4">timing_info</span>
+     <li><span class="dfn-paneled" id="b23305d39492fb7d58d912b81e05ff07">timing_info_present_flag</span>
     </ul>
    <li>
     <a data-link-type="biblio">[CENC]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="08bdf12f">bytesofcleardata</span>
-     <li><span class="dfn-paneled" id="7e1402cf">bytesofprotecteddata</span>
-     <li><span class="dfn-paneled" id="aea95c63">cbcs</span>
-     <li><span class="dfn-paneled" id="8d1f372c">cenc</span>
+     <li><span class="dfn-paneled" id="935be28bb2ef232ad16945b2cdb69c0f">bytesofcleardata</span>
+     <li><span class="dfn-paneled" id="0823905e938db14fa0ce9f54969cea70">bytesofprotecteddata</span>
+     <li><span class="dfn-paneled" id="2b285af7abdae2d4aab3a7cbedfdd6ab">cbcs</span>
+     <li><span class="dfn-paneled" id="742c038dd8361327983a92bd81e21859">cenc</span>
     </ul>
    <li>
     <a data-link-type="biblio">[CMAF]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="ce4f79c4">cmaf video track</span>
-     <li><span class="dfn-paneled" id="8e134714">cmfc</span>
+     <li><span class="dfn-paneled" id="1568b5183e757fdee5323510bdd1a120">cmaf video track</span>
+     <li><span class="dfn-paneled" id="76fc7918b57ae33e76892402603c6b72">cmfc</span>
     </ul>
    <li>
     <a data-link-type="biblio">[ISOBMFF]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="fe72a98d">bitr</span>
-     <li><span class="dfn-paneled" id="d610a6f9">clap</span>
-     <li><span class="dfn-paneled" id="df22dcca">clli</span>
-     <li><span class="dfn-paneled" id="addc5c57">colr</span>
-     <li><span class="dfn-paneled" id="574e11bb">ctts</span>
-     <li><span class="dfn-paneled" id="103b0ad5">iso6</span>
-     <li><span class="dfn-paneled" id="c2257a27">mdcv</span>
-     <li><span class="dfn-paneled" id="80acadec">nclx</span>
-     <li><span class="dfn-paneled" id="62954e09">visualsampleentry</span>
+     <li><span class="dfn-paneled" id="952f01526c87045a89015e38d1931006">bitr</span>
+     <li><span class="dfn-paneled" id="52b8fcc7cef8754159148e684a77d02e">clap</span>
+     <li><span class="dfn-paneled" id="15388b1662efccc6c0d26daa21eb8a02">clli</span>
+     <li><span class="dfn-paneled" id="6351cd1cc3bfb6561867f56587297705">colr</span>
+     <li><span class="dfn-paneled" id="1b1b183a7f9c84aa05248368ea7421ba">ctts</span>
+     <li><span class="dfn-paneled" id="295c612b69b22d9306c1004b4766efa2">iso6</span>
+     <li><span class="dfn-paneled" id="fcf81bf686786e641e169d84d6f6c84a">mdcv</span>
+     <li><span class="dfn-paneled" id="f2de67e75e1151de694a7aedeccb7e6c">nclx</span>
+     <li><span class="dfn-paneled" id="d72ed60b4c680fa6477d565e9553dd28">visualsampleentry</span>
     </ul>
    <li>
     <a data-link-type="biblio">[RFC6381]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="05d9bbbb">codecs</span>
+     <li><span class="dfn-paneled" id="df8441526d3bbb5086bd93c1fae005b3">codecs</span>
     </ul>
    <li>
     <a data-link-type="biblio">[VP9]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="259a7661">coll</span>
-     <li><span class="dfn-paneled" id="fd8e2db3">smdm</span>
+     <li><span class="dfn-paneled" id="37f26709df4ef02bccacdfb3c0626342">coll</span>
+     <li><span class="dfn-paneled" id="b459180629a753573e7c799ce3a57f45">smdm</span>
     </ul>
   </ul>
   <h2 class="no-num no-ref heading settled" id="references"><span class="content">References</span><a class="self-link" href="#references"></a></h2>
@@ -2736,68 +3174,118 @@ <h3 class="no-num no-ref heading settled" id="normative"><span class="content">N
    <dt id="biblio-rfc6381">[RFC6381]
    <dd>R. Gellens; D. Singer; P. Frojdh. <a href="https://www.rfc-editor.org/rfc/rfc6381"><cite>The 'Codecs' and 'Profiles' Parameters for "Bucket" Media Types</cite></a>. August 2011. Proposed Standard. URL: <a href="https://www.rfc-editor.org/rfc/rfc6381">https://www.rfc-editor.org/rfc/rfc6381</a>
   </dl>
-<script>/* Boilerplate: script-dfn-panel */
+  <aside aria-labelledby="infopaneltitle-for-av1sampleentry" class="dfn-panel" data-for="av1sampleentry" id="infopanel-for-av1sampleentry">
+   <span id="infopaneltitle-for-av1sampleentry" style="display:none">Info about the 'AV1SampleEntry' definition.</span><b><a href="#av1sampleentry">#av1sampleentry</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-av1sampleentry">2.1. General Requirements &amp; Brands</a>
+    <li><a href="#ref-for-av1sampleentry①">2.2.4. Semantics</a>
+    <li><a href="#ref-for-av1sampleentry②">2.4. AV1 Sample Format</a> <a href="#ref-for-av1sampleentry③">(2)</a>
+    <li><a href="#ref-for-av1sampleentry④">3. CMAF AV1 track format</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-av1codecconfigurationbox" class="dfn-panel" data-for="av1codecconfigurationbox" id="infopanel-for-av1codecconfigurationbox">
+   <span id="infopaneltitle-for-av1codecconfigurationbox" style="display:none">Info about the 'AV1CodecConfigurationBox' definition.</span><b><a href="#av1codecconfigurationbox">#av1codecconfigurationbox</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-av1codecconfigurationbox">2.2.2. Description</a>
+    <li><a href="#ref-for-av1codecconfigurationbox①">2.2.4. Semantics</a> <a href="#ref-for-av1codecconfigurationbox②">(2)</a>
+    <li><a href="#ref-for-av1codecconfigurationbox③">2.3.4. Semantics</a> <a href="#ref-for-av1codecconfigurationbox④">(2)</a> <a href="#ref-for-av1codecconfigurationbox⑤">(3)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-high_bitdepth" class="dfn-panel" data-for="high_bitdepth" id="infopanel-for-high_bitdepth">
+   <span id="infopaneltitle-for-high_bitdepth" style="display:none">Info about the 'high_bitdepth' definition.</span><b><a href="#high_bitdepth">#high_bitdepth</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-high_bitdepth">2.3.4. Semantics</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-twelve_bit" class="dfn-panel" data-for="twelve_bit" id="infopanel-for-twelve_bit">
+   <span id="infopaneltitle-for-twelve_bit" style="display:none">Info about the 'twelve_bit' definition.</span><b><a href="#twelve_bit">#twelve_bit</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-twelve_bit">2.3.4. Semantics</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-chroma_subsampling_x" class="dfn-panel" data-for="chroma_subsampling_x" id="infopanel-for-chroma_subsampling_x">
+   <span id="infopaneltitle-for-chroma_subsampling_x" style="display:none">Info about the 'chroma_subsampling_x' definition.</span><b><a href="#chroma_subsampling_x">#chroma_subsampling_x</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-chroma_subsampling_x">2.3.4. Semantics</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-chroma_subsampling_y" class="dfn-panel" data-for="chroma_subsampling_y" id="infopanel-for-chroma_subsampling_y">
+   <span id="infopaneltitle-for-chroma_subsampling_y" style="display:none">Info about the 'chroma_subsampling_y' definition.</span><b><a href="#chroma_subsampling_y">#chroma_subsampling_y</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-chroma_subsampling_y">2.3.4. Semantics</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-chroma_sample_position" class="dfn-panel" data-for="chroma_sample_position" id="infopanel-for-chroma_sample_position">
+   <span id="infopaneltitle-for-chroma_sample_position" style="display:none">Info about the 'chroma_sample_position' definition.</span><b><a href="#chroma_sample_position">#chroma_sample_position</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-chroma_sample_position">2.3.4. Semantics</a> <a href="#ref-for-chroma_sample_position①">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-initial_presentation_delay_minus_one" class="dfn-panel" data-for="initial_presentation_delay_minus_one" id="infopanel-for-initial_presentation_delay_minus_one">
+   <span id="infopaneltitle-for-initial_presentation_delay_minus_one" style="display:none">Info about the 'initial_presentation_delay_minus_one' definition.</span><b><a href="#initial_presentation_delay_minus_one">#initial_presentation_delay_minus_one</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-initial_presentation_delay_minus_one">2.3.4. Semantics</a> <a href="#ref-for-initial_presentation_delay_minus_one①">(2)</a> <a href="#ref-for-initial_presentation_delay_minus_one②">(3)</a> <a href="#ref-for-initial_presentation_delay_minus_one③">(4)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-av1-sample" class="dfn-panel" data-for="av1-sample" id="infopanel-for-av1-sample">
+   <span id="infopaneltitle-for-av1-sample" style="display:none">Info about the 'AV1 Sample' definition.</span><b><a href="#av1-sample">#av1-sample</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-av1-sample">2.2.2. Description</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-av1forwardkeyframesamplegroupentry" class="dfn-panel" data-for="av1forwardkeyframesamplegroupentry" id="infopanel-for-av1forwardkeyframesamplegroupentry">
+   <span id="infopaneltitle-for-av1forwardkeyframesamplegroupentry" style="display:none">Info about the 'AV1ForwardKeyFrameSampleGroupEntry' definition.</span><b><a href="#av1forwardkeyframesamplegroupentry">#av1forwardkeyframesamplegroupentry</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-av1forwardkeyframesamplegroupentry">2.3.4. Semantics</a>
+    <li><a href="#ref-for-av1forwardkeyframesamplegroupentry①">2.4. AV1 Sample Format</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-av1multiframesamplegroupentry" class="dfn-panel" data-for="av1multiframesamplegroupentry" id="infopanel-for-av1multiframesamplegroupentry">
+   <span id="infopaneltitle-for-av1multiframesamplegroupentry" style="display:none">Info about the 'AV1MultiFrameSampleGroupEntry' definition.</span><b><a href="#av1multiframesamplegroupentry">#av1multiframesamplegroupentry</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-av1multiframesamplegroupentry">2.4. AV1 Sample Format</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-av1s" class="dfn-panel" data-for="av1s" id="infopanel-for-av1s">
+   <span id="infopaneltitle-for-av1s" style="display:none">Info about the 'av1s' definition.</span><b><a href="#av1s">#av1s</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-av1s">2.4. AV1 Sample Format</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-av1switchframesamplegroupentry" class="dfn-panel" data-for="av1switchframesamplegroupentry" id="infopanel-for-av1switchframesamplegroupentry">
+   <span id="infopaneltitle-for-av1switchframesamplegroupentry" style="display:none">Info about the 'AV1SwitchFrameSampleGroupEntry' definition.</span><b><a href="#av1switchframesamplegroupentry">#av1switchframesamplegroupentry</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-av1switchframesamplegroupentry">2.4. AV1 Sample Format</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-av1metadatasamplegroupentry" class="dfn-panel" data-for="av1metadatasamplegroupentry" id="infopanel-for-av1metadatasamplegroupentry">
+   <span id="infopaneltitle-for-av1metadatasamplegroupentry" style="display:none">Info about the 'AV1MetadataSampleGroupEntry' definition.</span><b><a href="#av1metadatasamplegroupentry">#av1metadatasamplegroupentry</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-av1metadatasamplegroupentry">2.4. AV1 Sample Format</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-cmaf-av1-track" class="dfn-panel" data-for="cmaf-av1-track" id="infopanel-for-cmaf-av1-track">
+   <span id="infopaneltitle-for-cmaf-av1-track" style="display:none">Info about the 'CMAF AV1 Track' definition.</span><b><a href="#cmaf-av1-track">#cmaf-av1-track</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-cmaf-av1-track">3. CMAF AV1 track format</a>
+    <li><a href="#ref-for-cmaf-av1-track①">4. Common Encryption</a>
+   </ul>
+  </aside>
+<script>/* script-dfn-panel */
 "use strict";
 {
-    const dfnsJson = window.dfnsJson || {};
-
-    function genDfnPanel({dfnID, url, dfnText, refSections, external}) {
-        return mk.aside({
-            class: "dfn-panel",
-            id: `infopanel-for-${dfnID}`,
-            "data-for": dfnID,
-            "aria-labelled-by":`infopaneltitle-for-${dfnID}`,
-            },
-            mk.span({id:`infopaneltitle-for-${dfnID}`, style:"display:none"},
-                `Info about the '${dfnText}' ${external?"external":""} reference.`),
-            mk.a({href:url}, url),
-            mk.b({}, "Referenced in:"),
-            mk.ul({},
-                ...refSections.map(section=>
-                    mk.li({},
-                        ...section.refs.map((ref, refI)=>
-                            [
-                                mk.a({
-                                    href: `#${ref.id}`
-                                    },
-                                    (refI == 0) ? section.title : `(${refI + 1})`
-                                ),
-                                " ",
-                            ]
-                        ),
-                    ),
-                ),
-            ),
-        );
-    }
-
-    function genAllDfnPanels() {
-        for(const panelData of Object.values(window.dfnpanelData)) {
-            const dfnID = panelData.dfnID;
-            const dfn = document.getElementById(dfnID);
-            if(!dfn) {
-                console.log(`Can't find dfn#${dfnID}.`, panelData);
-            } else {
-                const panel = genDfnPanel(panelData);
-                append(document.body, panel);
-                insertDfnPopupAction(dfn, panel)
-            }
-        }
+    function queryAll(sel) {
+        return [].slice.call(document.querySelectorAll(sel));
     }
 
-    document.addEventListener("DOMContentLoaded", ()=>{
-        genAllDfnPanels();
-
-        // Add popup behavior to all dfns to show the corresponding dfn-panel.
-        var dfns = queryAll('.dfn-paneled');
-        for(let dfn of dfns) { ; }
-
-        document.body.addEventListener("click", (e) => {
-            // If not handled already, just hide all dfn panels.
-            hideAllDfnPanels();
-        });
-    })
+    // Add popup behavior to all dfns to show the corresponding dfn-panel.
+    var dfns = document.querySelectorAll('.dfn-paneled');
+    for (let dfn of dfns) { insertDfnPopupAction(dfn); }
 
+    document.body.addEventListener("click", (e) => {
+        // If not handled already, just hide all dfn panels.
+        hideAllDfnPanels();
+    });
 
     function hideAllDfnPanels() {
         // Turn off any currently "on" or "activated" panels.
@@ -2847,469 +3335,49 @@ <h3 class="no-num no-ref heading settled" id="normative"><span class="content">N
         }
     }
 
-    function insertDfnPopupAction(dfn, dfnPanel) {
+    function insertDfnPopupAction(dfn) {
         // Find dfn panel
-        const panelWrapper = document.createElement('span');
-        panelWrapper.appendChild(dfnPanel);
-        panelWrapper.style.position = "relative";
-        panelWrapper.style.height = "0px";
-        dfn.insertAdjacentElement("afterend", panelWrapper);
-        dfn.setAttribute('role', 'button');
-        dfn.setAttribute('aria-expanded', 'false')
-        dfn.tabIndex = 0;
-        dfn.classList.add('has-dfn-panel');
-        dfn.addEventListener('click', (event) => {
-            showDfnPanel(dfnPanel, dfn);
-            event.stopPropagation();
-        });
-        dfn.addEventListener('keypress', (event) => {
-            const kc = event.keyCode;
-            // 32->Space, 13->Enter
-            if(kc == 32 || kc == 13) {
-                toggleDfnPanel(dfnPanel, dfn);
+        const dfnPanel = document.querySelector(`.dfn-panel[data-for='${dfn.id}']`);
+        if (dfnPanel) {
+            const panelWrapper = document.createElement('span');
+            panelWrapper.appendChild(dfnPanel);
+            panelWrapper.style.position = "relative";
+            panelWrapper.style.height = "0px";
+            dfn.insertAdjacentElement("afterend", panelWrapper);
+            dfn.setAttribute('role', 'button');
+            dfn.setAttribute('aria-expanded', 'false')
+            dfn.tabIndex = 0;
+            dfn.classList.add('has-dfn-panel');
+            dfn.addEventListener('click', (event) => {
+                showDfnPanel(dfnPanel, dfn);
                 event.stopPropagation();
-                event.preventDefault();
-            }
-        });
-
-        dfnPanel.addEventListener('click', (event) => {
-            if (event.target.nodeName == 'A') {
+            });
+            dfn.addEventListener('keypress', (event) => {
+                const kc = event.keyCode;
+                // 32->Space, 13->Enter
+                if(kc == 32 || kc == 13) {
+                    toggleDfnPanel(dfnPanel, dfn);
+                    event.stopPropagation();
+                    event.preventDefault();
+                }
+            });
+
+            dfnPanel.addEventListener('click', (event) => {
                 pinDfnPanel(dfnPanel);
-            }
-            event.stopPropagation();
-        });
-
-        dfnPanel.addEventListener('keydown', (event) => {
-            if(event.keyCode == 27) { // Escape key
-                hideDfnPanel(dfnPanel, dfn);
                 event.stopPropagation();
-                event.preventDefault();
-            }
-        })
-    }
-}
-</script>
-<script>/* Boilerplate: script-dfn-panel */
-"use strict";
-{
-    const dfnsJson = window.dfnsJson || {};
-
-    function genDfnPanel({dfnID, url, dfnText, refSections, external}) {
-        return mk.aside({
-            class: "dfn-panel",
-            id: `infopanel-for-${dfnID}`,
-            "data-for": dfnID,
-            "aria-labelled-by":`infopaneltitle-for-${dfnID}`,
-            },
-            mk.span({id:`infopaneltitle-for-${dfnID}`, style:"display:none"},
-                `Info about the '${dfnText}' ${external?"external":""} reference.`),
-            mk.a({href:url}, url),
-            mk.b({}, "Referenced in:"),
-            mk.ul({},
-                ...refSections.map(section=>
-                    mk.li({},
-                        ...section.refs.map((ref, refI)=>
-                            [
-                                mk.a({
-                                    href: `#${ref.id}`
-                                    },
-                                    (refI == 0) ? section.title : `(${refI + 1})`
-                                ),
-                                " ",
-                            ]
-                        ),
-                    ),
-                ),
-            ),
-        );
-    }
-
-    function genAllDfnPanels() {
-        for(const panelData of Object.values(window.dfnpanelData)) {
-            const dfnID = panelData.dfnID;
-            const dfn = document.getElementById(dfnID);
-            if(!dfn) {
-                console.log(`Can't find dfn#${dfnID}.`, panelData);
-            } else {
-                const panel = genDfnPanel(panelData);
-                append(document.body, panel);
-                insertDfnPopupAction(dfn, panel)
-            }
-        }
-    }
-
-    document.addEventListener("DOMContentLoaded", ()=>{
-        genAllDfnPanels();
-
-        // Add popup behavior to all dfns to show the corresponding dfn-panel.
-        var dfns = queryAll('.dfn-paneled');
-        for(let dfn of dfns) { ; }
-
-        document.body.addEventListener("click", (e) => {
-            // If not handled already, just hide all dfn panels.
-            hideAllDfnPanels();
-        });
-    })
-
-
-    function hideAllDfnPanels() {
-        // Turn off any currently "on" or "activated" panels.
-        queryAll(".dfn-panel.on, .dfn-panel.activated").forEach(el=>hideDfnPanel(el));
-    }
-
-    function showDfnPanel(dfnPanel, dfn) {
-        hideAllDfnPanels(); // Only display one at this time.
-        dfn.setAttribute("aria-expanded", "true");
-        dfnPanel.classList.add("on");
-        dfnPanel.style.left = "5px";
-        dfnPanel.style.top = "0px";
-        const panelRect = dfnPanel.getBoundingClientRect();
-        const panelWidth = panelRect.right - panelRect.left;
-        if (panelRect.right > document.body.scrollWidth) {
-            // Panel's overflowing the screen.
-            // Just drop it below the dfn and flip it rightward instead.
-            // This still wont' fix things if the screen is *really* wide,
-            // but fixing that's a lot harder without 'anchor()'.
-            dfnPanel.style.top = "1.5em";
-            dfnPanel.style.left = "auto";
-            dfnPanel.style.right = "0px";
-        }
-    }
-
-    function pinDfnPanel(dfnPanel) {
-        // Switch it to "activated" state, which pins it.
-        dfnPanel.classList.add("activated");
-        dfnPanel.style.left = null;
-        dfnPanel.style.top = null;
-    }
+            });
 
-    function hideDfnPanel(dfnPanel, dfn) {
-        if(!dfn) {
-            dfn = document.getElementById(dfnPanel.getAttribute("data-for"));
-        }
-        dfn.setAttribute("aria-expanded", "false")
-        dfnPanel.classList.remove("on");
-        dfnPanel.classList.remove("activated");
-    }
+            dfnPanel.addEventListener('keydown', (event) => {
+                if(event.keyCode == 27) { // Escape key
+                    hideDfnPanel(dfnPanel, dfn);
+                    event.stopPropagation();
+                    event.preventDefault();
+                }
+            })
 
-    function toggleDfnPanel(dfnPanel, dfn) {
-        if(dfnPanel.classList.contains("on")) {
-            hideDfnPanel(dfnPanel, dfn);
         } else {
-            showDfnPanel(dfnPanel, dfn);
+            console.log("Couldn't find .dfn-panel[data-for='" + dfn.id + "']");
         }
     }
-
-    function insertDfnPopupAction(dfn, dfnPanel) {
-        // Find dfn panel
-        const panelWrapper = document.createElement('span');
-        panelWrapper.appendChild(dfnPanel);
-        panelWrapper.style.position = "relative";
-        panelWrapper.style.height = "0px";
-        dfn.insertAdjacentElement("afterend", panelWrapper);
-        dfn.setAttribute('role', 'button');
-        dfn.setAttribute('aria-expanded', 'false')
-        dfn.tabIndex = 0;
-        dfn.classList.add('has-dfn-panel');
-        dfn.addEventListener('click', (event) => {
-            showDfnPanel(dfnPanel, dfn);
-            event.stopPropagation();
-        });
-        dfn.addEventListener('keypress', (event) => {
-            const kc = event.keyCode;
-            // 32->Space, 13->Enter
-            if(kc == 32 || kc == 13) {
-                toggleDfnPanel(dfnPanel, dfn);
-                event.stopPropagation();
-                event.preventDefault();
-            }
-        });
-
-        dfnPanel.addEventListener('click', (event) => {
-            if (event.target.nodeName == 'A') {
-                pinDfnPanel(dfnPanel);
-            }
-            event.stopPropagation();
-        });
-
-        dfnPanel.addEventListener('keydown', (event) => {
-            if(event.keyCode == 27) { // Escape key
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diff --git a/v120_init.html b/v120_init.html
new file mode 100644
index 0000000..87e6bd8
--- /dev/null
+++ b/v120_init.html
@@ -0,0 +1,3430 @@
+<!doctype html><html lang="en">
+ <head>
+  <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
+  <title>AV1 Codec ISO Media File Format Binding</title>
+  <meta content="width=device-width, initial-scale=1, shrink-to-fit=no" name="viewport">
+<style data-fill-with="stylesheet">/******************************************************************************
+ *                   Style sheet for the W3C specifications                   *
+ *
+ * Special classes handled by this style sheet include:
+ *
+ * Indices
+ *   - .toc for the Table of Contents (<ol class="toc">)
+ *     + <span class="secno"> for the section numbers
+ *   - #toc for the Table of Contents (<nav id="toc">)
+ *   - ul.index for Indices (<a href="#ref">term</a><span>, in § N.M</span>)
+ *   - table.index for Index Tables (e.g. for properties or elements)
+ *
+ * Structural Markup
+ *   - table.data for general data tables
+ *     -> use 'scope' attribute, <colgroup>, <thead>, and <tbody> for best results !
+ *     -> use <table class='complex data'> for extra-complex tables
+ *     -> use <td class='long'> for paragraph-length cell content
+ *     -> use <td class='pre'> when manual line breaks/indentation would help readability
+ *   - dl.switch for switch statements
+ *   - ol.algorithm for algorithms (helps to visualize nesting)
+ *   - .figure and .caption (HTML4) and figure and figcaption (HTML5)
+ *     -> .sidefigure for right-floated figures
+ *   - ins/del
+ *     -> ins/del.c### for candidate and proposed changes (amendments)
+ *
+ * Code
+ *   - pre and code
+ *
+ * Special Sections
+ *   - .note       for informative notes             (div, p, span, aside, details)
+ *   - .example    for informative examples          (div, p, pre, span)
+ *   - .issue      for issues                        (div, p, span)
+ *   - .advisement for loud normative statements     (div, p, strong)
+ *   - .annoying-warning for spec obsoletion notices (div, aside, details)
+ *   - .correction for "candidate corrections"       (div, aside, details, section)
+ *   - .addition   for "candidate additions"         (div, aside, details, section)
+ *   - .correction.proposed for "proposed corrections" (div, aside, details, section)
+ *   - .addition.proposed   for "proposed additions"   (div, aside, details, section)
+ *
+ * Definition Boxes
+ *   - pre.def   for WebIDL definitions
+ *   - table.def for tables that define other entities (e.g. CSS properties)
+ *   - dl.def    for definition lists that define other entitles (e.g. HTML elements)
+ *
+ * Numbering
+ *   - .secno for section numbers in .toc and headings (<span class='secno'>3.2</span>)
+ *   - .marker for source-inserted example/figure/issue numbers (<span class='marker'>Issue 4</span>)
+ *   - ::before styled for CSS-generated issue/example/figure numbers:
+ *     -> Documents wishing to use this only need to add
+ *        figcaption::before,
+ *        .caption::before { content: "Figure "  counter(figure) " ";  }
+ *        .example::before { content: "Example " counter(example) " "; }
+ *        .issue::before   { content: "Issue "   counter(issue) " ";   }
+ *
+ * Header Stuff (ignore, just don't conflict with these classes)
+ *   - .head for the header
+ *   - .copyright for the copyright
+ *
+ * Outdated warning for old specs
+ *
+ * Miscellaneous
+ *   - .overlarge for things that should be as wide as possible, even if
+ *     that overflows the body text area. This can be used on an item or
+ *     on its container, depending on the effect desired.
+ *     Note that this styling basically doesn't help at all when printing,
+ *     since A4 paper isn't much wider than the max-width here.
+ *     It's better to design things to fit into a narrower measure if possible.
+ *
+ *   - js-added ToC jump links (see fixup.js)
+ *
+ ******************************************************************************/
+
+/* color variables included separately for reliability */
+
+/******************************************************************************/
+/*                                    Body                                    */
+/******************************************************************************/
+
+	html {
+	}
+
+	body {
+		counter-reset: example figure issue;
+
+		/* Layout */
+		max-width: 50em;			  /* limit line length to 50em for readability   */
+		margin: 0 auto;				/* center text within page                    */
+		padding: 1.6em 1.5em 2em 50px; /* assume 16px font size for downlevel clients */
+		padding: 1.6em 1.5em 2em calc(26px + 1.5em); /* leave space for status flag    */
+
+		/* Typography */
+		line-height: 1.5;
+		font-family: sans-serif;
+		widows: 2;
+		orphans: 2;
+		word-wrap: break-word;
+		overflow-wrap: break-word;
+		hyphens: auto;
+
+		color: black;
+		color: var(--text);
+		background: white top left fixed no-repeat;
+		background: var(--bg) top left fixed no-repeat;
+		background-size: 25px auto;
+	}
+
+
+/******************************************************************************/
+/*                         Front Matter & Navigation                          */
+/******************************************************************************/
+
+/** Header ********************************************************************/
+
+	div.head { margin-bottom: 1em; }
+	div.head hr { border-style: solid; }
+
+	div.head h1 {
+		font-weight: bold;
+		margin: 0 0 .1em;
+		font-size: 220%;
+	}
+
+	div.head h2 { margin-bottom: 1.5em;}
+
+/** W3C Logo ******************************************************************/
+
+	.head .logo {
+		float: right;
+		margin: 0.4rem 0 0.2rem .4rem;
+	}
+
+	.head img[src*="logos/W3C"] {
+		display: block;
+		border: solid #1a5e9a;
+		border: solid var(--logo-bg);
+		border-width: .65rem .7rem .6rem;
+		border-radius: .4rem;
+		background: #1a5e9a;
+		background: var(--logo-bg);
+		color: white;
+		color: var(--logo-text);
+		font-weight: bold;
+	}
+
+	.head a:hover > img[src*="logos/W3C"],
+	.head a:focus > img[src*="logos/W3C"] {
+		opacity: .8;
+	}
+
+	.head a:active > img[src*="logos/W3C"] {
+		background: #c00;
+		background: var(--logo-active-bg);
+		border-color: #c00;
+		border-color: var(--logo-active-bg);
+	}
+
+	/* see also additional rules in Link Styling section */
+
+/** Copyright *****************************************************************/
+
+	p.copyright,
+	p.copyright small { font-size: small; }
+
+/** Back to Top / ToC Toggle **************************************************/
+
+	@media print {
+		#toc-nav {
+			display: none;
+		}
+	}
+	@media not print {
+		#toc-nav {
+			position: fixed;
+			z-index: 3;
+			bottom: 0; left: 0;
+			margin: 0;
+			min-width: 1.33em;
+			border-top-right-radius: 2rem;
+			box-shadow: 0 0 2px;
+			font-size: 1.5em;
+		}
+		#toc-nav > a {
+			display: block;
+			white-space: nowrap;
+
+			height: 1.33em;
+			padding: .1em 0.3em;
+			margin: 0;
+
+			box-shadow: 0 0 2px;
+			border: none;
+			border-top-right-radius: 1.33em;
+
+			color: #707070;
+			color: var(--tocnav-normal-text);
+			background: white;
+			background: var(--tocnav-normal-bg);
+		}
+		#toc-nav > a:hover,
+		#toc-nav > a:focus {
+			color: black;
+			color: var(--tocnav-hover-text);
+			background: #f8f8f8;
+			background: var(--tocnav-hover-bg);
+		}
+		#toc-nav > a:active {
+			color: #c00;
+			color: var(--tocnav-active-text);
+			background: white;
+			background: var(--tocnav-active-bg);
+		}
+
+		#toc-nav > #toc-jump {
+			padding-bottom: 2em;
+			margin-bottom: -1.9em;
+		}
+
+		/* statusbar gets in the way on keyboard focus; remove once browsers fix */
+		#toc-nav > a[href="#toc"]:not(:hover):focus:last-child {
+			padding-bottom: 1.5rem;
+		}
+
+		#toc-nav:not(:hover) > a:not(:focus) > span + span {
+			/* Ideally this uses :focus-within on #toc-nav */
+			display: none;
+		}
+		#toc-nav > a > span + span {
+			padding-right: 0.2em;
+		}
+	}
+
+/** ToC Sidebar ***************************************************************/
+
+	/* Floating sidebar */
+	@media screen {
+		body.toc-sidebar #toc {
+			position: fixed;
+			top: 0; bottom: 0;
+			left: 0;
+			width: 23.5em;
+			max-width: 80%;
+			max-width: calc(100% - 2em - 26px);
+			overflow: auto;
+			padding: 0 1em;
+			padding-left: 42px;
+			padding-left: calc(1em + 26px);
+			color: black;
+			color: var(--tocsidebar-text);
+			background: inherit;
+			background-color: #f7f8f9;
+			background-color: var(--tocsidebar-bg);
+			z-index: 1;
+			box-shadow: -.1em 0 .25em rgba(0,0,0,.1) inset;
+			box-shadow: -.1em 0 .25em var(--tocsidebar-shadow) inset;
+		}
+		body.toc-sidebar #toc h2 {
+			margin-top: .8rem;
+			font-variant: small-caps;
+			font-variant: all-small-caps;
+			text-transform: lowercase;
+			font-weight: bold;
+			color: gray;
+			color: hsla(203,20%,40%,.7);
+			color: var(--tocsidebar-heading-text);
+		}
+		body.toc-sidebar #toc-jump:not(:focus) {
+			width: 0;
+			height: 0;
+			padding: 0;
+			position: absolute;
+			overflow: hidden;
+		}
+	}
+	/* Hide main scroller when only the ToC is visible anyway */
+	@media screen and (max-width: 28em) {
+		body.toc-sidebar {
+			overflow: hidden;
+		}
+	}
+
+	/* Sidebar with its own space */
+	@media screen and (min-width: 78em) {
+		body:not(.toc-inline) #toc {
+			position: fixed;
+			top: 0; bottom: 0;
+			left: 0;
+			width: 23.5em;
+			overflow: auto;
+			padding: 0 1em;
+			padding-left: 42px;
+			padding-left: calc(1em + 26px);
+			color: black;
+			color: var(--tocsidebar-text);
+			background: inherit;
+			background-color: #f7f8f9;
+			background-color: var(--tocsidebar-bg);
+			z-index: 1;
+			box-shadow: -.1em 0 .25em rgba(0,0,0,.1) inset;
+			box-shadow: -.1em 0 .25em var(--tocsidebar-shadow) inset;
+		}
+		body:not(.toc-inline) #toc h2 {
+			margin-top: .8rem;
+			font-variant: small-caps;
+			font-variant: all-small-caps;
+			text-transform: lowercase;
+			font-weight: bold;
+			color: gray;
+			color: hsla(203,20%,40%,.7);
+			color: var(--tocsidebar-heading-text);
+		}
+
+		body:not(.toc-inline) {
+			padding-left: 29em;
+		}
+		/* See also Overflow section at the bottom */
+
+		body:not(.toc-inline) #toc-jump:not(:focus) {
+			width: 0;
+			height: 0;
+			padding: 0;
+			position: absolute;
+			overflow: hidden;
+		}
+	}
+	@media screen and (min-width: 90em) {
+		body:not(.toc-inline) {
+			margin: 0 4em;
+		}
+	}
+
+/******************************************************************************/
+/*                                Sectioning                                  */
+/******************************************************************************/
+
+/** Headings ******************************************************************/
+
+	h1, h2, h3, h4, h5, h6, dt {
+		page-break-after: avoid;
+		page-break-inside: avoid;
+		font: 100% sans-serif;   /* Reset all font styling to clear out UA styles */
+		font-family: inherit;	/* Inherit the font family. */
+		line-height: 1.2;		/* Keep wrapped headings compact */
+		hyphens: manual;		/* Hyphenated headings look weird */
+	}
+
+	h2, h3, h4, h5, h6 {
+		margin-top: 3rem;
+	}
+
+	h1, h2, h3 {
+		color: #005A9C;
+		color: var(--heading-text);
+	}
+
+	h1 { font-size: 170%; }
+	h2 { font-size: 140%; }
+	h3 { font-size: 120%; }
+	h4 { font-weight: bold; }
+	h5 { font-style: italic; }
+	h6 { font-variant: small-caps; }
+	dt { font-weight: bold; }
+
+/** Subheadings ***************************************************************/
+
+	h1 + h2,
+	#profile-and-date {
+		/* #profile-and-date is a subtitle in an H2 under the H1 */
+		margin-top: 0;
+	}
+	h2 + h3,
+	h3 + h4,
+	h4 + h5,
+	h5 + h6 {
+		margin-top: 1.2em; /* = 1 x line-height */
+	}
+
+/** Section divider ***********************************************************/
+
+	:not(.head) > :not(.head) + hr {
+		font-size: 1.5em;
+		text-align: center;
+		margin: 1em auto;
+		height: auto;
+		color: black;
+		color: var(--hr-text);
+		border: transparent solid 0;
+		background: transparent;
+	}
+	:not(.head) > hr::before {
+		content: "\2727\2003\2003\2727\2003\2003\2727";
+	}
+
+/******************************************************************************/
+/*                            Paragraphs and Lists                            */
+/******************************************************************************/
+
+	p {
+		margin: 1em 0;
+	}
+
+	dd > p:first-child,
+	li > p:first-child {
+		margin-top: 0;
+	}
+
+	ul, ol {
+		margin-left: 0;
+		padding-left: 2em;
+	}
+
+	li {
+		margin: 0.25em 0 0.5em;
+		padding: 0;
+	}
+
+	dl dd {
+		margin: 0 0 .5em 2em;
+	}
+
+	.head dd + dd { /* compact for header */
+		margin-top: -.5em;
+	}
+
+	/* Style for algorithms */
+	ol.algorithm ol:not(.algorithm),
+	.algorithm > ol ol:not(.algorithm) {
+	border-left: 0.5em solid #DEF;
+	border-left: 0.5em solid var(--algo-border);
+	}
+
+	/* Put nice boxes around each algorithm. */
+	[data-algorithm]:not(.heading) {
+	 padding: .5em;
+	 border: thin solid #ddd;
+	 border: thin solid var(--algo-border);
+	 border-radius: .5em;
+	 margin: .5em calc(-0.5em - 1px);
+	}
+	[data-algorithm]:not(.heading) > :first-child {
+	 margin-top: 0;
+	}
+	[data-algorithm]:not(.heading) > :last-child {
+	 margin-bottom: 0;
+	}
+
+	/* Style for switch/case <dl>s */
+	dl.switch > dd > ol.only,
+	dl.switch > dd > .only > ol {
+	margin-left: 0;
+	}
+	dl.switch > dd > ol.algorithm,
+	dl.switch > dd > .algorithm > ol {
+	margin-left: -2em;
+	}
+	dl.switch {
+	padding-left: 2em;
+	}
+	dl.switch > dt {
+	text-indent: -1.5em;
+	margin-top: 1em;
+	}
+	dl.switch > dt + dt {
+	margin-top: 0;
+	}
+	dl.switch > dt::before {
+	content: '\21AA';
+	padding: 0 0.5em 0 0;
+	display: inline-block;
+	width: 1em;
+	text-align: right;
+	line-height: 0.5em;
+	}
+
+/** Terminology Markup ********************************************************/
+
+
+/******************************************************************************/
+/*                                 Inline Markup                              */
+/******************************************************************************/
+
+/** Terminology Markup ********************************************************/
+	dfn   { /* Defining instance */
+		font-weight: bolder;
+	}
+	a > i { /* Instance of term */
+		font-style: normal;
+	}
+	dt dfn code, code.idl {
+		font-size: inherit;
+	}
+	dfn var {
+		font-style: normal;
+	}
+
+/** Change Marking ************************************************************/
+
+	del {
+		color: #aa0000;
+		color: var(--del-text);
+		background: transparent;
+		background: var(--del-bg);
+		text-decoration: line-through;
+	}
+	ins {
+		color: #006100;
+		color: var(--ins-text);
+		background: transparent;
+		background: var(--ins-bg);
+		text-decoration: underline;
+	}
+
+	/* for amendments (candidate/proposed changes) */
+
+	.amendment ins, .correction ins, .addition ins,
+	ins[class^=c] {
+		text-decoration-style: dotted;
+	}
+	.amendment del, .correction del, .addition del,
+	del[class^=c] {
+		text-decoration-style: dotted;
+	}
+	.amendment.proposed ins, .correction.proposed ins, .addition.proposed ins,
+	ins[class^=c].proposed {
+		text-decoration-style: double;
+	}
+	.amendment.proposed del, .correction.proposed del, .addition.proposed del,
+	del[class^=c].proposed {
+		text-decoration-style: double;
+	}
+
+/** Miscellaneous improvements to inline formatting ***************************/
+
+	sup {
+		vertical-align: super;
+		font-size: 80%
+	}
+
+/******************************************************************************/
+/*                                    Code                                    */
+/******************************************************************************/
+
+/** General monospace/pre rules ***********************************************/
+
+	pre, code, samp {
+		font-family: Menlo, Consolas, "DejaVu Sans Mono", Monaco, monospace;
+		font-size: .9em;
+		hyphens: none;
+		text-transform: none;
+		text-align: left;
+		text-align: start;
+		font-variant: normal;
+		orphans: 3;
+		widows: 3;
+		page-break-before: avoid;
+	}
+	pre code,
+	code code {
+		font-size: 100%;
+	}
+
+	pre {
+		margin-top: 1em;
+		margin-bottom: 1em;
+		overflow: auto;
+	}
+
+/** Inline Code fragments *****************************************************/
+
+	/* Do something nice. */
+
+/******************************************************************************/
+/*                                    Links                                   */
+/******************************************************************************/
+
+/** General Hyperlinks ********************************************************/
+
+	/* We hyperlink a lot, so make it less intrusive */
+	a[href] {
+		color: #034575;
+		color: var(--a-normal-text);
+		text-decoration: underline #707070;
+		text-decoration: underline var(--a-normal-underline);
+		text-decoration-skip-ink: none;
+	}
+	a:visited {
+		color: #034575;
+		color: var(--a-visited-text);
+		text-decoration-color: #bbb;
+		text-decoration-color: var(--a-visited-underline);
+	}
+
+	/* Indicate interaction with the link */
+	a[href]:focus,
+	a[href]:hover {
+		text-decoration-thickness: 2px;
+	}
+	a[href]:active {
+		color: #c00;
+		color: var(--a-active-text);
+		text-decoration-color: #c00;
+		text-decoration-color: var(--a-active-underline);
+	}
+
+	/* Backout above styling for W3C logo */
+	.head .logo,
+	.head .logo a {
+		border: none;
+		text-decoration: none;
+		background: transparent;
+	}
+
+/******************************************************************************/
+/*                                    Images                                  */
+/******************************************************************************/
+
+	img {
+		border-style: none;
+	}
+
+	img, svg {
+		/* Intentionally not color-scheme aware. */
+		background: white;
+	}
+
+	/* For autogen numbers, add
+	  .caption::before, figcaption::before { content: "Figure " counter(figure) ". "; }
+	*/
+
+	figure, .figure, .sidefigure {
+		page-break-inside: avoid;
+		text-align: center;
+		margin: 2.5em 0;
+	}
+	.figure img,	.sidefigure img,	figure img,
+	.figure object, .sidefigure object, figure object {
+		max-width: 100%;
+		margin: auto;
+		height: auto;
+	}
+	.figure pre, .sidefigure pre, figure pre {
+		text-align: left;
+		display: table;
+		margin: 1em auto;
+	}
+	.figure table, figure table {
+		margin: auto;
+	}
+	@media screen and (min-width: 20em) {
+		.sidefigure {
+			float: right;
+			width: 50%;
+			margin: 0 0 0.5em 0.5em;
+		}
+	}
+	.caption, figcaption, caption {
+		font-style: italic;
+		font-size: 90%;
+	}
+	.caption::before, figcaption::before, figcaption > .marker {
+		font-weight: bold;
+	}
+	.caption, figcaption {
+		counter-increment: figure;
+	}
+
+	/* DL list is indented 2em, but figure inside it is not */
+	dd > .figure, dd > figure { margin-left: -2em; }
+
+/******************************************************************************/
+/*                             Colored Boxes                                  */
+/******************************************************************************/
+
+	.issue, .note, .example, .assertion, .advisement, blockquote,
+	.amendment, .correction, .addition {
+		margin: 1em auto;
+		padding: .5em;
+		border: .5em;
+		border-left-style: solid;
+		page-break-inside: avoid;
+	}
+	span.issue, span.note {
+		padding: .1em .5em .15em;
+		border-right-style: solid;
+	}
+
+	blockquote > :first-child,
+	.note  > p:first-child,
+	.issue > p:first-child,
+	.amendment > p:first-child,
+	.correction > p:first-child,
+	.addition > p:first-child {
+		margin-top: 0;
+	}
+	blockquote > :last-child,
+	.note  > p:last-child,
+	.issue > p:last-child,
+	.amendment > p:last-child,
+	.correction > p:last-child,
+	.addition > p:last-child {
+		margin-bottom: 0;
+	}
+
+
+	.issue::before, .issue > .marker,
+	.example::before, .example > .marker,
+	.note::before, .note > .marker,
+	details.note > summary > .marker,
+	.amendment::before, .amendment > .marker,
+	details.amendment > summary > .marker,
+	.addition::before, .addition > .marker,
+	addition.amendment > summary > .marker,
+	.correction::before, .correction > .marker,
+	correction.amendment > summary > .marker
+	{
+		text-transform: uppercase;
+		padding-right: 1em;
+	}
+
+	.example::before, .example > .marker {
+		display: block;
+		padding-right: 0em;
+	}
+
+/** Blockquotes ***************************************************************/
+
+	blockquote {
+		border-color: silver;
+		border-color: var(--blockquote-border);
+		background: transparent;
+		background: var(--blockquote-bg);
+		color: currentcolor;
+		color: var(--blockquote-text);
+	}
+
+/** Open issue ****************************************************************/
+
+	.issue {
+		border-color: #e05252;
+		border-color: var(--issue-border);
+		background: #fbe9e9;
+		background: var(--issue-bg);
+		color: black;
+		color: var(--issue-text);
+		counter-increment: issue;
+		overflow: auto;
+	}
+	.issue::before, .issue > .marker {
+		color: #831616;
+		color: var(--issueheading-text);
+	}
+	/* Add .issue::before { content: "Issue " counter(issue) " "; } for autogen numbers,
+	  or use class="marker" to mark up the issue number in source. */
+
+/** Example *******************************************************************/
+
+	.example {
+		border-color: #e0cb52;
+		border-color: var(--example-border);
+		background: #fcfaee;
+		background: var(--example-bg);
+		color: black;
+		color: var(--example-text);
+		counter-increment: example;
+		overflow: auto;
+		clear: both;
+	}
+	.example::before, .example > .marker {
+		color: #574b0f;
+		color: var(--exampleheading-text);
+	}
+	/* Add .example::before { content: "Example " counter(example) " "; } for autogen numbers,
+	  or use class="marker" to mark up the example number in source. */
+
+/** Non-normative Note ********************************************************/
+
+	.note {
+		border-color: #52e052;
+		border-color: var(--note-border);
+		background: #e9fbe9;
+		background: var(--note-bg);
+		color: black;
+		color: var(--note-text);
+		overflow: auto;
+	}
+
+	.note::before, .note > .marker,
+	details.note > summary {
+		color: hsl(120, 70%, 30%);
+		color: var(--noteheading-text);
+	}
+	/* Add .note::before { content: "Note "; } for autogen label,
+	  or use class="marker" to mark up the label in source. */
+
+	details.note[open] > summary {
+		border-bottom: 1px silver solid;
+		border-bottom: 1px var(--notesummary-underline) solid;
+	}
+
+/** Assertion Box *************************************************************/
+	/*  for assertions in algorithms */
+
+	.assertion {
+		border-color: #AAA;
+		border-color: var(--assertion-border);
+		background: #EEE;
+		background: var(--assertion-bg);
+		color: black;
+		color: var(--assertion-text);
+	}
+
+/** Advisement Box ************************************************************/
+	/*  for attention-grabbing normative statements */
+
+	.advisement {
+		border-color: orange;
+		border-color: var(--advisement-border);
+		border-style: none solid;
+		background: #fec;
+		background: var(--advisement-bg);
+		color: black;
+		color: var(--advisement-text);
+	}
+	strong.advisement {
+		display: block;
+		text-align: center;
+	}
+	.advisement::before, .advisement > .marker {
+		color: #b35f00;
+		color: var(--advisementheading-text);
+	}
+
+/** Amendment Box *************************************************************/
+
+	.amendment, .correction, .addition {
+		border-color: #330099;
+		border-color: var(--amendment-border);
+		background: #F5F0FF;
+		background: var(--amendment-bg);
+		color: black;
+		color: var(--amendment-text);
+	}
+	.amendment.proposed, .correction.proposed, .addition.proposed {
+		border-style: solid;
+		border-block-width: 0.25em;
+	}
+	.amendment::before, .amendment > .marker,
+	details.amendment > summary::before, details.amendment > summary > .marker,
+	.correction::before, .correction > .marker,
+	details.correction > summary::before, details.correction > summary > .marker,
+	.addition::before, .addition > .marker,
+	details.addition > summary::before, details.addition > summary > .marker {
+		color: #220066;
+		color: var(--amendmentheading-text);
+	}
+	.amendment.proposed::before, .amendment.proposed > .marker,
+	details.amendment.proposed > summary::before, details.amendment.proposed > summary > .marker,
+	.correction.proposed::before, .correction.proposed > .marker,
+	details.correction.proposed > summary::before, details.correction.proposed > summary > .marker,
+	.addition.proposed::before, .addition.proposed > .marker,
+	details.addition.proposed > summary::before, details.addition.proposed > summary > .marker {
+		font-weight: bold;
+	}
+
+/** Spec Obsoletion Notice ****************************************************/
+	/* obnoxious obsoletion notice for older/abandoned specs. */
+
+	details {
+		display: block;
+	}
+	summary {
+		font-weight: bolder;
+	}
+
+	.annoying-warning:not(details),
+	details.annoying-warning:not([open]) > summary,
+	details.annoying-warning[open] {
+		background: hsla(40,100%,50%,0.95);
+		background: var(--warning-bg);
+		color: black;
+		color: var(--warning-text);
+		padding: .75em 1em;
+		border: red;
+		border: var(--warning-border);
+		border-style: solid none;
+		box-shadow: 0 2px 8px black;
+		text-align: center;
+	}
+	.annoying-warning :last-child {
+		margin-bottom: 0;
+	}
+
+@media not print {
+	details.annoying-warning[open] {
+		position: fixed;
+		left: 0;
+		right: 0;
+		bottom: 2em;
+		z-index: 1000;
+	}
+}
+
+	details.annoying-warning:not([open]) > summary {
+		text-align: center;
+	}
+
+/** Entity Definition Boxes ***************************************************/
+
+	.def {
+		padding: .5em 1em;
+		background: #def;
+		background: var(--def-bg);
+		margin: 1.2em 0;
+		border-left: 0.5em solid #8ccbf2;
+		border-left: 0.5em solid var(--def-border);
+		color: black;
+		color: var(--def-text);
+	}
+
+/******************************************************************************/
+/*                                    Tables                                  */
+/******************************************************************************/
+
+	th, td {
+		text-align: left;
+		text-align: start;
+	}
+
+/** Property/Descriptor Definition Tables *************************************/
+
+	table.def {
+		/* inherits .def box styling, see above */
+		width: 100%;
+		border-spacing: 0;
+	}
+
+	table.def td,
+	table.def th {
+		padding: 0.5em;
+		vertical-align: baseline;
+		border-bottom: 1px solid #bbd7e9;
+		border-bottom: 1px solid var(--defrow-border);
+	}
+
+	table.def > tbody > tr:last-child th,
+	table.def > tbody > tr:last-child td {
+		border-bottom: 0;
+	}
+
+	table.def th {
+		font-style: italic;
+		font-weight: normal;
+		padding-left: 1em;
+		width: 3em;
+	}
+
+	/* For when values are extra-complex and need formatting for readability */
+	table td.pre {
+		white-space: pre-wrap;
+	}
+
+	/* A footnote at the bottom of a def table */
+	table.def td.footnote {
+		padding-top: 0.6em;
+	}
+	table.def td.footnote::before {
+		content: " ";
+		display: block;
+		height: 0.6em;
+		width: 4em;
+		border-top: thin solid;
+	}
+
+/** Data tables (and properly marked-up index tables) *************************/
+	/*
+		<table class="data"> highlights structural relationships in a table
+		when correct markup is used (e.g. thead/tbody, th vs. td, scope attribute)
+
+		Use class="complex data" for particularly complicated tables --
+		(This will draw more lines: busier, but clearer.)
+
+		Use class="long" on table cells with paragraph-like contents
+		(This will adjust text alignment accordingly.)
+		Alternately use class="longlastcol" on tables, to have the last column assume "long".
+	*/
+
+	table {
+		word-wrap: normal;
+		overflow-wrap: normal;
+		hyphens: manual;
+	}
+
+	table.data,
+	table.index {
+		margin: 1em auto;
+		border-collapse: collapse;
+		border: hidden;
+		width: 100%;
+	}
+	table.data caption,
+	table.index caption {
+		max-width: 50em;
+		margin: 0 auto 1em;
+	}
+
+	table.data td,  table.data th,
+	table.index td, table.index th {
+		padding: 0.5em 1em;
+		border-width: 1px;
+		border-color: silver;
+		border-color: var(--datacell-border);
+		border-top-style: solid;
+	}
+
+	table.data thead td:empty {
+		padding: 0;
+		border: 0;
+	}
+
+	table.data  thead,
+	table.index thead,
+	table.data  tbody,
+	table.index tbody {
+		border-bottom: 2px solid;
+	}
+
+	table.data colgroup,
+	table.index colgroup {
+		border-left: 2px solid;
+	}
+
+	table.data  tbody th:first-child,
+	table.index tbody th:first-child  {
+		border-right: 2px solid;
+		border-top: 1px solid silver;
+		border-top: 1px solid var(--datacell-border);
+		padding-right: 1em;
+	}
+
+	table.data th[colspan],
+	table.data td[colspan] {
+		text-align: center;
+	}
+
+	table.complex.data th,
+	table.complex.data td {
+		border: 1px solid silver;
+		border: 1px solid var(--datacell-border);
+		text-align: center;
+	}
+
+	table.data.longlastcol td:last-child,
+	table.data td.long {
+		vertical-align: baseline;
+		text-align: left;
+	}
+
+	table.data img {
+		vertical-align: middle;
+	}
+
+
+/*
+Alternate table alignment rules
+
+	table.data,
+	table.index {
+		text-align: center;
+	}
+
+	table.data  thead th[scope="row"],
+	table.index thead th[scope="row"] {
+		text-align: right;
+	}
+
+	table.data  tbody th:first-child,
+	table.index tbody th:first-child  {
+		text-align: right;
+	}
+
+Possible extra rowspan handling
+
+	table.data  tbody th[rowspan]:not([rowspan='1']),
+	table.index tbody th[rowspan]:not([rowspan='1']),
+	table.data  tbody td[rowspan]:not([rowspan='1']),
+	table.index tbody td[rowspan]:not([rowspan='1']) {
+		border-left: 1px solid silver;
+	}
+
+	table.data  tbody th[rowspan]:first-child,
+	table.index tbody th[rowspan]:first-child,
+	table.data  tbody td[rowspan]:first-child,
+	table.index tbody td[rowspan]:first-child{
+		border-left: 0;
+		border-right: 1px solid silver;
+	}
+*/
+
+/******************************************************************************/
+/*                                  Indices                                   */
+/******************************************************************************/
+
+
+/** Table of Contents *********************************************************/
+
+	.toc a {
+		/* More spacing; use padding to make it part of the click target. */
+		padding: 0.1rem 1px 0;
+		/* Larger, more consistently-sized click target */
+		display: block;
+		/* Switch to using border-bottom for underlines */
+		text-decoration: none;
+		border-bottom: 1px solid;
+		/* Reverse color scheme */
+		color: black;
+		color: var(--toclink-text);
+		border-color: #3980b5;
+		border-color: var(--toclink-underline);
+	}
+	.toc a:visited {
+		color: black;
+		color: var(--toclink-visited-text);
+		border-color: #054572;
+		border-color: var(--toclink-visited-underline);
+	}
+	.toc a:focus,
+	.toc a:hover {
+		background: rgba(75%, 75%, 75%, .25);
+		background: var(--a-hover-bg);
+		border-bottom-width: 3px;
+		margin-bottom: -2px;
+	}
+	.toc a:not(:focus):not(:hover) {
+		/* Allow colors to cascade through from link styling */
+		border-bottom-color: transparent;
+	}
+
+	.toc, .toc ol, .toc ul, .toc li {
+		list-style: none; /* Numbers must be inlined into source */
+		/* because generated content isn't search/selectable and markers can't do multilevel yet */
+		margin:  0;
+		padding: 0;
+	}
+	.toc {
+		line-height: 1.1em;
+	}
+
+	/* ToC not indented until third level, but font style & margins show hierarchy */
+	.toc > li			{ font-weight: bold;   }
+	.toc > li li		 { font-weight: normal; }
+	.toc > li li li	  { font-size:   95%;	}
+	.toc > li li li li	{ font-size:   90%;	}
+	.toc > li li li li li { font-size:   85%;	}
+
+	/* @supports not (display:grid) { */
+		.toc > li			{ margin: 1.5rem 0;	}
+		.toc > li li		 { margin: 0.3rem 0;	}
+		.toc > li li li	  { margin-left: 2rem;   }
+
+		/* Section numbers in a column of their own */
+		.toc .secno {
+			float: left;
+			width: 4rem;
+			white-space: nowrap;
+		}
+		.toc > li li li li .secno { font-size: 85%; }
+		.toc > li li li li li .secno { font-size: 100%; }
+
+		.toc li {
+			clear: both;
+		}
+
+		:not(li) > .toc			 { margin-left:  5rem; }
+		.toc .secno				 { margin-left: -5rem; }
+		.toc > li li li .secno	  { margin-left: -7rem; }
+		.toc > li li li li .secno	{ margin-left: -9rem; }
+		.toc > li li li li li .secno { margin-left: -11rem; }
+
+		/* Tighten up indentation in narrow ToCs */
+		@media (max-width: 30em) {
+			:not(li) > .toc			 { margin-left:  4rem; }
+			.toc .secno				 { margin-left: -4rem; }
+			.toc > li li li			 { margin-left:  1rem; }
+			.toc > li li li .secno	  { margin-left: -5rem; }
+			.toc > li li li li .secno	{ margin-left: -6rem; }
+			.toc > li li li li li .secno { margin-left: -7rem; }
+		}
+		/* Loosen it on wide screens */
+		@media screen and (min-width: 78em) {
+			body:not(.toc-inline) :not(li) > .toc			 { margin-left:  4rem; }
+			body:not(.toc-inline) .toc .secno				 { margin-left: -4rem; }
+			body:not(.toc-inline) .toc > li li li			 { margin-left:  1rem; }
+			body:not(.toc-inline) .toc > li li li .secno	  { margin-left: -5rem; }
+			body:not(.toc-inline) .toc > li li li li .secno	{ margin-left: -6rem; }
+			body:not(.toc-inline) .toc > li li li li li .secno { margin-left: -7rem; }
+	}
+	/* } */
+
+	@supports (display:grid) and (display:contents) {
+		/* Use #toc over .toc to override non-@supports rules. */
+		#toc {
+			display: grid;
+			align-content: start;
+			grid-template-columns: auto 1fr;
+			grid-column-gap: 1rem;
+			column-gap: 1rem;
+			grid-row-gap: .6rem;
+			row-gap: .6rem;
+		}
+		#toc h2 {
+			grid-column: 1 / -1;
+			margin-bottom: 0;
+		}
+		#toc ol,
+		#toc li,
+		#toc a {
+			display: contents;
+			/* Switch <a> to subgrid when supported */
+		}
+		#toc span {
+			margin: 0;
+		}
+		#toc > .toc > li > a > span {
+			/* The spans of the top-level list,
+			  comprising the first items of each top-level section. */
+			margin-top: 1.1rem;
+		}
+		#toc#toc .secno { /* Ugh, need more specificity to override base.css */
+			grid-column: 1;
+			width: auto;
+			margin-left: 0;
+		}
+		#toc .content {
+			grid-column: 2;
+			width: auto;
+			margin-right: 1rem;
+			border-bottom: 3px solid transparent;
+			margin-bottom: -3px;
+		}
+		#toc .content:hover,
+		#toc .content:focus {
+			background: rgba(75%, 75%, 75%, .25);
+			background: var(--a-hover-bg);
+			border-bottom-color: #054572;
+			border-bottom-color: var(--toclink-underline);
+		}
+		#toc li li li .content {
+			margin-left: 1rem;
+		}
+		#toc li li li li .content {
+			margin-left: 2rem;
+		}
+	}
+
+
+/** Index *********************************************************************/
+
+	/* Index Lists: Layout */
+	ul.index	  { margin-left: 0; columns: 15em; text-indent: 1em hanging; }
+	ul.index li	{ margin-left: 0; list-style: none; break-inside: avoid; }
+	ul.index li li { margin-left: 1em; }
+	ul.index dl	{ margin-top: 0; }
+	ul.index dt	{ margin: .2em 0 .2em 20px;}
+	ul.index dd	{ margin: .2em 0 .2em 40px;}
+	/* Index Lists: Typography */
+	ul.index ul,
+	ul.index dl { font-size: smaller; }
+	@media not print {
+		ul.index li a + span {
+			white-space: nowrap;
+			color: transparent; }
+		ul.index li a:hover + span,
+		ul.index li a:focus + span {
+			color: #707070;
+			color: var(--indexinfo-text);
+		}
+	}
+
+/** Index Tables *****************************************************/
+	/* See also the data table styling section, which this effectively subclasses */
+
+	table.index {
+		font-size: small;
+		border-collapse: collapse;
+		border-spacing: 0;
+		text-align: left;
+		margin: 1em 0;
+	}
+
+	table.index td,
+	table.index th {
+		padding: 0.4em;
+	}
+
+	table.index tr:hover td:not([rowspan]),
+	table.index tr:hover th:not([rowspan]) {
+		color: black;
+		color: var(--indextable-hover-text);
+		background: #f7f8f9;
+		background: var(--indextable-hover-bg);
+	}
+
+	/* The link in the first column in the property table (formerly a TD) */
+	table.index th:first-child a {
+		font-weight: bold;
+	}
+
+/** Outdated warning **********************************************************/
+
+.outdated-spec {
+	color: black;
+	color: var(--outdatedspec-text);
+	background-color: rgba(0,0,0,0.5);
+	background-color: var(--outdatedspec-bg);
+}
+
+.outdated-warning {
+	position: fixed;
+	bottom: 50%;
+	left: 0;
+	right: 0;
+	margin: 0 auto;
+	width: 50%;
+	background: maroon;
+	background: var(--outdated-bg);
+	color: white;
+	color: var(--outdated-text);
+	border-radius: 1em;
+	box-shadow: 0 0 1em red;
+	box-shadow: 0 0 1em var(--outdated-shadow);
+	padding: 2em;
+	text-align: center;
+	z-index: 2;
+}
+
+.outdated-warning a {
+	color: currentcolor;
+	background: transparent;
+}
+
+.edited-rec-warning {
+	background: darkorange;
+	background: var(--editedrec-bg);
+	box-shadow: 0 0 1em;
+}
+
+.outdated-warning button {
+	color: var(--outdated-text);
+	border-radius: 1em;
+	box-shadow: 0 0 1em red;
+	box-shadow: 0 0 1em var(--outdated-shadow);
+	padding: 2em;
+	text-align: center;
+	z-index: 2;
+}
+
+.outdated-warning a {
+	color: currentcolor;
+	background: transparent;
+}
+
+.edited-rec-warning {
+	background: darkorange;
+	background: var(--editedrec-bg);
+	box-shadow: 0 0 1em;
+}
+
+.outdated-warning button {
+	position: absolute;
+	top: 0;
+	right:0;
+	margin: 0;
+	border: 0;
+	padding: 0.25em 0.5em;
+	background: transparent;
+	color: white;
+	color: var(--outdated-text);
+	font:1em sans-serif;
+	text-align:center;
+}
+
+.outdated-warning span {
+	display: block;
+}
+
+.outdated-collapsed {
+	bottom: 0;
+	border-radius: 0;
+	width: 100%;
+	padding: 0;
+}
+
+/******************************************************************************/
+/*                                    Print                                   */
+/******************************************************************************/
+
+	@media print {
+		/* Pages have their own margins. */
+		html {
+			margin: 0;
+		}
+		/* Serif for print. */
+		body {
+			font-family: serif;
+		}
+
+		.outdated-warning {
+			position: absolute;
+			border-style: solid;
+			border-color: red;
+		}
+
+		.outdated-warning input {
+			display: none;
+		}
+	}
+	@page {
+		margin: 1.5cm 1.1cm;
+	}
+
+
+
+/******************************************************************************/
+/*                             Overflow Control                               */
+/******************************************************************************/
+
+	.figure .caption, .sidefigure .caption, figcaption {
+		/* in case figure is overlarge, limit caption to 50em */
+		max-width: 50rem;
+		margin-left: auto;
+		margin-right: auto;
+	}
+	.overlarge {
+		/* Magic to create good item positioning:
+		  "content column" is 50ems wide at max; less on smaller screens.
+		  Extra space (after ToC + content) is empty on the right.
+
+		  1. When item < content column, centers item in column.
+		  2. When content < item < available, left-aligns.
+		  3. When item > available, fills available + scroll bar.
+		*/
+		display: grid;
+		grid-template-columns: minmax(0, 50em);
+	}
+	.overlarge > table {
+		/* limit preferred width of table */
+		max-width: 50em;
+		margin-left: auto;
+		margin-right: auto;
+	}
+
+	@media (min-width: 55em) {
+		.overlarge {
+			margin-right: calc(13px + 26.5rem - 50vw);
+			max-width: none;
+		}
+	}
+	@media screen and (min-width: 78em) {
+		body:not(.toc-inline) .overlarge {
+			/* 30.5em body padding 50em content area */
+			margin-right: calc(40em - 50vw) !important;
+		}
+	}
+	@media screen and (min-width: 90em) {
+		body:not(.toc-inline) .overlarge {
+			/* 4em html margin 30.5em body padding 50em content area */
+			margin-right: calc(84.5em - 100vw) !important;
+		}
+	}
+
+	@media not print {
+		.overlarge {
+			overflow-x: auto;
+			/* See Lea Verou's explanation background-attachment:
+			* http://lea.verou.me/2012/04/background-attachment-local/
+			*
+			background: top left  / 4em 100% linear-gradient(to right,  #ffffff, rgba(255, 255, 255, 0)) local,
+						top right / 4em 100% linear-gradient(to left, #ffffff, rgba(255, 255, 255, 0)) local,
+						top left  / 1em 100% linear-gradient(to right,  #c3c3c5, rgba(195, 195, 197, 0)) scroll,
+						top right / 1em 100% linear-gradient(to left, #c3c3c5, rgba(195, 195, 197, 0)) scroll,
+						white;
+			background-repeat: no-repeat;
+			*/
+		}
+	}
+</style>
+  <meta content="Bikeshed version d9bd89757, updated Thu Mar 23 10:06:53 2023 -0700" name="generator">
+  <link href="https://aomediacodec.github.io/av1-isobmff/" rel="canonical">
+  <meta content="61b1746fa5bbc0b94100eab194bef5961db1c4b6" name="document-revision">
+<style>/* style-autolinks */
+.css.css, .property.property, .descriptor.descriptor {
+    color: var(--a-normal-text);
+    font-size: inherit;
+    font-family: inherit;
+}
+.css::before, .property::before, .descriptor::before {
+    content: "‘";
+}
+.css::after, .property::after, .descriptor::after {
+    content: "’";
+}
+.property, .descriptor {
+    /* Don't wrap property and descriptor names */
+    white-space: nowrap;
+}
+.type { /* CSS value <type> */
+    font-style: italic;
+}
+pre .property::before, pre .property::after {
+    content: "";
+}
+[data-link-type="property"]::before,
+[data-link-type="propdesc"]::before,
+[data-link-type="descriptor"]::before,
+[data-link-type="value"]::before,
+[data-link-type="function"]::before,
+[data-link-type="at-rule"]::before,
+[data-link-type="selector"]::before,
+[data-link-type="maybe"]::before {
+    content: "‘";
+}
+[data-link-type="property"]::after,
+[data-link-type="propdesc"]::after,
+[data-link-type="descriptor"]::after,
+[data-link-type="value"]::after,
+[data-link-type="function"]::after,
+[data-link-type="at-rule"]::after,
+[data-link-type="selector"]::after,
+[data-link-type="maybe"]::after {
+    content: "’";
+}
+
+[data-link-type].production::before,
+[data-link-type].production::after,
+.prod [data-link-type]::before,
+.prod [data-link-type]::after {
+    content: "";
+}
+
+[data-link-type=element],
+[data-link-type=element-attr] {
+    font-family: Menlo, Consolas, "DejaVu Sans Mono", monospace;
+    font-size: .9em;
+}
+[data-link-type=element]::before { content: "<" }
+[data-link-type=element]::after  { content: ">" }
+
+[data-link-type=biblio] {
+    white-space: pre;
+}
+</style>
+<style>/* style-colors */
+
+/* Any --*-text not paired with a --*-bg is assumed to have a transparent bg */
+:root {
+    color-scheme: light dark;
+
+    --text: black;
+    --bg: white;
+
+    --unofficial-watermark: url(https://www.w3.org/StyleSheets/TR/2016/logos/UD-watermark);
+
+    --logo-bg: #1a5e9a;
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+    --blockquote-border: silver;
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+    --blockquote-text: currentcolor;
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+    --issue-text: var(--text);
+    --issueheading-text: #831616;
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+    --example-border: #e0cb52;
+    --example-bg: #fcfaee;
+    --example-text: var(--text);
+    --exampleheading-text: #574b0f;
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+    --note-border: #52e052;
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+    --note-text: var(--text);
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+    --warning-border: red;
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+    --amendment-border: #330099;
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+    --outdated-text: white;
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+}
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+   regarding paragraph and lists. */
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+@media (prefers-color-scheme: dark) {
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+        --tocsidebar-text: var(--text);
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+        --a-visited-text: var(--a-normal-text);
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+        --a-hover-bg: rgba(25%, 25%, 25%, .2);
+        --a-active-text: #f44;
+        --a-active-underline: var(--a-active-text);
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+        --borderedblock-bg: rgba(255, 255, 255, .05);
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+        --blockquote-border: silver;
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+        --issue-border: #e05252;
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+        --issue-text: var(--text);
+        --issueheading-text: hsl(0deg, 70%, 70%);
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+        --example-border: hsl(50deg, 90%, 60%);
+        --example-bg: var(--borderedblock-bg);
+        --example-text: var(--text);
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+        --note-border: hsl(120deg, 100%, 35%);
+        --note-bg: var(--borderedblock-bg);
+        --note-text: var(--text);
+        --noteheading-text: hsl(120, 70%, 70%);
+        --notesummary-underline: silver;
+
+        --assertion-border: #444;
+        --assertion-bg: var(--borderedblock-bg);
+        --assertion-text: var(--text);
+
+        --advisement-border: orange;
+        --advisement-bg: #222218;
+        --advisement-text: var(--text);
+        --advisementheading-text: #f84;
+
+        --warning-border: red;
+        --warning-bg: hsla(40,100%,20%,0.95);
+        --warning-text: var(--text);
+
+        --amendment-border: #330099;
+        --amendment-bg: #080010;
+        --amendment-text: var(--text);
+        --amendmentheading-text: #cc00ff;
+
+        --def-border: #8ccbf2;
+        --def-bg: #080818;
+        --def-text: var(--text);
+        --defrow-border: #136;
+
+        --datacell-border: silver;
+
+        --indexinfo-text: #aaa;
+
+        --indextable-hover-text: var(--text);
+        --indextable-hover-bg: #181818;
+
+        --outdatedspec-bg: rgba(255, 255, 255, .5);
+        --outdatedspec-text: black;
+        --outdated-bg: maroon;
+        --outdated-text: white;
+        --outdated-shadow: red;
+
+        --editedrec-bg: darkorange;
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+       which is quite common in practice... */
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+
+@media (prefers-color-scheme: dark) {
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+        --selflink-bg: silver;
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+}
+
+@media (prefers-color-scheme: dark) {
+    :root {
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+        --dfnpanel-text: var(--text);
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+}
+</style>
+ <body class="h-entry">
+  <div class="head">
+   <p data-fill-with="logo"><a class="logo" href="https://www.aomedia.org/" style="width: 200px"> <img alt="AOM" height="60" src="https://aomedia.org/assets/images/aomedia-logo-rgb.svg" width="200"> </a> </p>
+   <h1 class="p-name no-ref" id="title">AV1 Codec ISO Media File Format Binding</h1>
+   <h2 class="p-name no-num no-toc no-ref heading settled" id="subtitle"><span class="content">v1.2.0</span></h2>
+   <h3 class="no-num no-toc no-ref heading settled" id="profile-and-date"><span class="content">AOM Final Deliverable, <time class="dt-updated" datetime="2019-12-12">12 December 2019</time></span></h3>
+   <div data-fill-with="spec-metadata">
+    <dl>
+     <dt>This version:
+     <dd><a class="u-url" href="https://aomediacodec.github.io/av1-isobmff/">https://aomediacodec.github.io/av1-isobmff/</a>
+     <dt>Issue Tracking:
+     <dd><a href="https://github.com/AOMediaCodec/av1-isobmff/issues/">GitHub</a>
+     <dt class="editor">Editors:
+     <dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:cconcolato@netflix.com">Cyril Concolato</a> (<span class="p-org org">Netflix</span>)
+     <dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:tom.finegan@google.com">Tom Finegan</a> (<span class="p-org org">Google</span>)
+     <dt>Previously approved version:
+     <dd><a href="v1.1.0.html">v1.1.0</a>
+    </dl>
+   </div>
+   <div data-fill-with="warning"></div>
+   <p class="copyright" data-fill-with="copyright">
+    <p>Copyright 2019, <a href="https://aomedia.org">AOM</a></p>
+    <p>Licensing information is available at <a href="http://aomedia.org/license/">http://aomedia.org/license/</a></p>
+    <p>The MATERIALS ARE PROVIDED “AS IS.” The Alliance for Open Media, its members, and its contributors expressly disclaim any warranties (express, implied, or otherwise), including implied warranties of merchantability, non-infringement, fitness for a particular purpose, or title, related to the materials. The entire risk as to implementing or otherwise using the materials is assumed by the implementer and user. IN NO EVENT WILL THE ALLIANCE FOR OPEN MEDIA, ITS MEMBERS, OR CONTRIBUTORS BE LIABLE TO ANY OTHER PARTY FOR LOST PROFITS OR ANY FORM OF INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OF ANY CHARACTER FROM ANY CAUSES OF ACTION OF ANY KIND WITH RESPECT TO THIS DELIVERABLE OR ITS GOVERNING AGREEMENT, WHETHER BASED ON BREACH OF CONTRACT, TORT (INCLUDING NEGLIGENCE), OR OTHERWISE, AND WHETHER OR NOT THE OTHER MEMBER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</p>
+   </p>
+   <hr title="Separator for header">
+  </div>
+  <div class="p-summary" data-fill-with="abstract">
+   <h2 class="no-num no-toc no-ref heading settled" id="abstract"><span class="content">Abstract</span></h2>
+   <p>This document specifies the storage format for <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a> bitstreams in <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a> tracks as well as in <a data-link-type="biblio" href="#biblio-cmaf" title="Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media">[CMAF]</a> files.</p>
+  </div>
+  <nav data-fill-with="table-of-contents" id="toc">
+   <h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
+   <ol class="toc" role="directory">
+    <li><a href="#bitstream-overview"><span class="secno">1</span> <span class="content">Bitstream features overview</span></a>
+    <li>
+     <a href="#basic-encapsulation"><span class="secno">2</span> <span class="content">Basic Encapsulation Scheme</span></a>
+     <ol class="toc">
+      <li><a href="#brands"><span class="secno">2.1</span> <span class="content">General Requirements &amp; Brands</span></a>
+      <li>
+       <a href="#av1sampleentry-section"><span class="secno">2.2</span> <span class="content">AV1 Sample Entry</span></a>
+       <ol class="toc">
+        <li><a href="#av1sampleentry-definition"><span class="secno">2.2.1</span> <span class="content">Definition</span></a>
+        <li><a href="#av1sampleentry-description"><span class="secno">2.2.2</span> <span class="content">Description</span></a>
+        <li><a href="#av1sampleentry-syntax"><span class="secno">2.2.3</span> <span class="content">Syntax</span></a>
+        <li><a href="#av1sampleentry-semantics"><span class="secno">2.2.4</span> <span class="content">Semantics</span></a>
+       </ol>
+      <li>
+       <a href="#av1codecconfigurationbox-section"><span class="secno">2.3</span> <span class="content">AV1 Codec Configuration Box</span></a>
+       <ol class="toc">
+        <li><a href="#av1codecconfigurationbox-definition"><span class="secno">2.3.1</span> <span class="content">Definition</span></a>
+        <li><a href="#av1codecconfigurationbox-description"><span class="secno">2.3.2</span> <span class="content">Description</span></a>
+        <li><a href="#av1codecconfigurationbox-syntax"><span class="secno">2.3.3</span> <span class="content">Syntax</span></a>
+        <li><a href="#av1codecconfigurationbox-semantics"><span class="secno">2.3.4</span> <span class="content">Semantics</span></a>
+       </ol>
+      <li><a href="#sampleformat"><span class="secno">2.4</span> <span class="content">AV1 Sample Format</span></a>
+      <li>
+       <a href="#forwardkeyframesamplegroupentry"><span class="secno">2.5</span> <span class="content">AV1 Forward Key Frame sample group entry</span></a>
+       <ol class="toc">
+        <li><a href="#forwardkeyframesamplegroupentry-definition"><span class="secno">2.5.1</span> <span class="content">Definition</span></a>
+        <li><a href="#forwardkeyframesamplegroupentry-description"><span class="secno">2.5.2</span> <span class="content">Description</span></a>
+        <li><a href="#forwardkeyframesamplegroupentry-syntax"><span class="secno">2.5.3</span> <span class="content">Syntax</span></a>
+        <li><a href="#forwardkeyframesamplegroupentry-semantics"><span class="secno">2.5.4</span> <span class="content">Semantics</span></a>
+       </ol>
+      <li>
+       <a href="#multiframesamplegroupentry"><span class="secno">2.6</span> <span class="content">AV1 Multi-Frame sample group entry</span></a>
+       <ol class="toc">
+        <li><a href="#multiframesamplegroupentry-definition"><span class="secno">2.6.1</span> <span class="content">Definition</span></a>
+        <li><a href="#multiframesamplegroupentry-description"><span class="secno">2.6.2</span> <span class="content">Description</span></a>
+        <li><a href="#multiframesamplegroupentry-syntax"><span class="secno">2.6.3</span> <span class="content">Syntax</span></a>
+       </ol>
+      <li>
+       <a href="#switchframesamplegroupentry"><span class="secno">2.7</span> <span class="content">AV1 Switch Frame sample group entry</span></a>
+       <ol class="toc">
+        <li><a href="#switchframesamplegroupentry-definition"><span class="secno">2.7.1</span> <span class="content">Definition</span></a>
+        <li><a href="#switchframesamplegroupentry-description"><span class="secno">2.7.2</span> <span class="content">Description</span></a>
+        <li><a href="#switchframesamplegroupentry-syntax"><span class="secno">2.7.3</span> <span class="content">Syntax</span></a>
+       </ol>
+      <li>
+       <a href="#metadatasamplegroupentry"><span class="secno">2.8</span> <span class="content">AV1 Metadata sample group entry</span></a>
+       <ol class="toc">
+        <li><a href="#metadatasamplegroupentry-definition"><span class="secno">2.8.1</span> <span class="content">Definition</span></a>
+        <li><a href="#metadatasamplegroupentry-description"><span class="secno">2.8.2</span> <span class="content">Description</span></a>
+        <li><a href="#metadatasamplegroupentry-syntax"><span class="secno">2.8.3</span> <span class="content">Syntax</span></a>
+        <li><a href="#metadatasamplegroupentry-semantics"><span class="secno">2.8.4</span> <span class="content">Semantics</span></a>
+       </ol>
+     </ol>
+    <li><a href="#cmaf"><span class="secno">3</span> <span class="content">CMAF AV1 track format</span></a>
+    <li>
+     <a href="#CommonEncryption"><span class="secno">4</span> <span class="content">Common Encryption</span></a>
+     <ol class="toc">
+      <li><a href="#subsample-encryption"><span class="secno">4.1</span> <span class="content">General Subsample Encryption constraints</span></a>
+      <li><a href="#subsample-encryption-illustration"><span class="secno">4.2</span> <span class="content">Subsample Encryption Illustration</span></a>
+     </ol>
+    <li><a href="#codecsparam"><span class="secno">5</span> <span class="content">Codecs Parameter String</span></a>
+    <li><a href="#changelist"><span class="secno">6</span> <span class="content">Changes since v1.1.0 release</span></a>
+    <li><a href="#conformance"><span class="secno"></span> <span class="content"> Conformance</span></a>
+    <li>
+     <a href="#index"><span class="secno"></span> <span class="content">Index</span></a>
+     <ol class="toc">
+      <li><a href="#index-defined-here"><span class="secno"></span> <span class="content">Terms defined by this specification</span></a>
+      <li><a href="#index-defined-elsewhere"><span class="secno"></span> <span class="content">Terms defined by reference</span></a>
+     </ol>
+    <li>
+     <a href="#references"><span class="secno"></span> <span class="content">References</span></a>
+     <ol class="toc">
+      <li><a href="#normative"><span class="secno"></span> <span class="content">Normative References</span></a>
+     </ol>
+   </ol>
+  </nav>
+  <main>
+   <h2 class="heading settled" data-level="1" id="bitstream-overview"><span class="secno">1. </span><span class="content">Bitstream features overview</span><a class="self-link" href="#bitstream-overview"></a></h2>
+    An <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1" id="ref-for-page=1">AV1 bitstream</a> is composed of a sequence of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39">OBUs</a>, grouped into <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13">Temporal Units</a>. 
+   <p>OBUs are made of a 1 or 2 bytes header, identifying in particular the type of OBU, followed by an optional length field and by an optional payload, whose presence and content depend on the OBU type. Depending on its type, an OBU can carry configuration information, metadata, or coded video data.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121">Tile List OBUs</a> defined in the <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a> specification are not supported in the current version of this specification. A future version of the specification may do so.</p>
+   <p>Temporal Units are processed by a decoder in the order given by the bitstream. Each Temporal Unit is associated with a presentation time. Some Temporal Units may contain multiple frames to be decoded but only one is presented.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> The AV1 specification defines scalability features, allowing frames from multiple layers or operating points to be present in a single temporal unit. This version of storage in ISOBMFF supports the simple storage of scalable streams in a single track, but does not specify advanced tools for handling multi-track support, layer extraction, or other scalability related use cases. A future version of the specification may do so.</p>
+   <p>Frames carried in Temporal Units may have coding dependencies on frames carried previously in the same Temporal Unit or in previous Temporal Units. Frames that can be decoded without dependencies to previous frames are of two categories: <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13①">Key Frames</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13②">Intra-only Frames</a>. Frames that cannot be decoded independently are of three categories: <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13③">Inter Frames</a>, <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13④">Switch Frames</a>, and frames with a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2">show_existing_frame</a> flag set to 1.</p>
+   <p>Key Frames with the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①">show_frame</a> flag set to 1 have the additional property that after decoding the Key Frame, all frames following the Key Frame in the bitstream can be decoded. They are called <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206">Random Access Points</a> in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a>.</p>
+   <p>Key Frames with the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②">show_frame</a> flag set to 0 are called <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206①">Delayed Random Access Points</a>. <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206②">Delayed Random Access Points</a> have the additional property that if a future <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206③">Key Frame Dependent Recovery Point</a> exists, all frames following that <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206④">Key Frame Dependent Recovery Point</a> can be decoded. A <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑤">Key Frame Dependent Recovery Point</a> is a frame with <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2③">show_existing_frame</a> set to 1 that refers to a previous <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑥">Delayed Random Access Points</a>.</p>
+   <h2 class="heading settled" data-level="2" id="basic-encapsulation"><span class="secno">2. </span><span class="content">Basic Encapsulation Scheme</span><a class="self-link" href="#basic-encapsulation"></a></h2>
+   <p>This section describes the basic data structures used to signal encapsulation of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1" id="ref-for-page=1①">AV1 bitstreams</a> in <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a> containers.</p>
+   <h3 class="heading settled" data-level="2.1" id="brands"><span class="secno">2.1. </span><span class="content">General Requirements &amp; Brands</span><a class="self-link" href="#brands"></a></h3>
+   <p>A file conformant to this specification satisfies the following:</p>
+   <ul>
+    <li data-md>
+     <p>It SHALL conform to the normative requirements of <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a></p>
+    <li data-md>
+     <p>It SHALL have the <dfn class="css" data-dfn-for="ISOBMFF Brand" data-dfn-type="value" data-export id="valdef-isobmff-brand-av01">av01<a class="self-link" href="#valdef-isobmff-brand-av01"></a></dfn> brand among the compatible brands array of the FileTypeBox</p>
+    <li data-md>
+     <p>It SHALL contain at least one track using an <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry">AV1SampleEntry</a></p>
+    <li data-md>
+     <p>It SHOULD indicate a structural ISOBMFF brand among the compatible brands array of the FileTypeBox, such as <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006">iso6</a></p>
+    <li data-md>
+     <p>It MAY indicate CMAF brands as specified in <a href="#cmaf">§ 3 CMAF AV1 track format</a></p>
+    <li data-md>
+     <p>It MAY indicate other brands not specified in this document provided that the associated requirements do not conflict with those given in this specification</p>
+   </ul>
+   <p>Parsers SHALL support the structures required by the <code><a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①">iso6</a></code> brand and MAY support structures required by further ISOBMFF structural brands.</p>
+   <h3 class="heading settled" data-level="2.2" id="av1sampleentry-section"><span class="secno">2.2. </span><span class="content">AV1 Sample Entry</span><a class="self-link" href="#av1sampleentry-section"></a></h3>
+   <h4 class="heading settled" data-level="2.2.1" id="av1sampleentry-definition"><span class="secno">2.2.1. </span><span class="content">Definition</span><a class="self-link" href="#av1sampleentry-definition"></a></h4>
+<pre class="def">Sample Entry Type: <dfn data-dfn-for="AV1SampleEntry" data-dfn-type="value" data-export id="valdef-av1sampleentry-av01">av01<a class="self-link" href="#valdef-av1sampleentry-av01"></a></dfn>
+Container:         Sample Description Box ('stsd')
+Mandatory:         Yes
+Quantity:          One or more.
+</pre>
+   <h4 class="heading settled" data-level="2.2.2" id="av1sampleentry-description"><span class="secno">2.2.2. </span><span class="content">Description</span><a class="self-link" href="#av1sampleentry-description"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1sampleentry">AV1SampleEntry</dfn> sample entry identifies that the track contains <a data-link-type="dfn" href="#av1-sample" id="ref-for-av1-sample">AV1 Samples</a>, and uses an <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox">AV1CodecConfigurationBox</a>.</p>
+   <h4 class="heading settled" data-level="2.2.3" id="av1sampleentry-syntax"><span class="secno">2.2.3. </span><span class="content">Syntax</span><a class="self-link" href="#av1sampleentry-syntax"></a></h4>
+<pre>class AV1SampleEntry extends VisualSampleEntry('av01') {
+  AV1CodecConfigurationBox config;
+}
+</pre>
+   <h4 class="heading settled" data-level="2.2.4" id="av1sampleentry-semantics"><span class="secno">2.2.4. </span><span class="content">Semantics</span><a class="self-link" href="#av1sampleentry-semantics"></a></h4>
+   <p>The <dfn data-dfn-type="dfn" data-noexport id="width">width<a class="self-link" href="#width"></a></dfn> and <dfn data-dfn-type="dfn" data-noexport id="height">height<a class="self-link" href="#height"></a></dfn> fields of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006②">VisualSampleEntry</a> SHALL equal the values of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2④">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑤">max_frame_height_minus_1</a> + 1 of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41">Sequence Header OBU</a> applying to the samples associated with this sample entry.</p>
+   <p>The width and height in the TrackHeaderBox SHOULD equal, respectively, the maximum RenderWidth, called MaxRenderWidth, and the maximum RenderHeight, called MaxRenderHeight, of all the frames associated with this sample entry. Additionally, if MaxRenderWidth and MaxRenderHeight values do not equal respectively the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑥">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑦">max_frame_height_minus_1</a> + 1 values of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①">Sequence Header OBU</a>, a PixelAspectRatioBox box SHALL be present in the sample entry and set such that</p>
+<pre>hSpacing / vSpacing = MaxRenderWidth * (max_frame_height_minus_1 + 1) /
+                              ((max_frame_width_minus_1 + 1) * MaxRenderHeight)
+</pre>
+   <p>The <dfn data-dfn-type="dfn" data-noexport id="compressorname">compressorname<a class="self-link" href="#compressorname"></a></dfn> field of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006③">VisualSampleEntry</a> is an informative name. It is formatted in a fixed 32-byte field, with the first byte set to the number of bytes to be displayed, followed by that number of bytes of displayable data, followed by padding to complete 32 bytes total (including the size byte). The value "\012AOM Coding" is RECOMMENDED; the first byte is a count of the remaining bytes, here represented by \012, which (being octal 12) is decimal 10, the number of bytes in the rest of the string.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> Parsers may ignore the value of the compressorname field. It is specified in this document simply for legacy and backwards compatibility reasons.</p>
+   <p>The <dfn data-dfn-type="dfn" data-noexport id="config">config<a class="self-link" href="#config"></a></dfn> field SHALL contain an <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox①">AV1CodecConfigurationBox</a> that applies to the samples associated with this sample entry.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> Multiple instances of <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry①">AV1SampleEntry</a> may be required when the track contains samples requiring a <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox②">AV1CodecConfigurationBox</a> with different characteristics.</p>
+   <p>Optional boxes not specifically mentioned here can be present, in particular those indicated in the definition of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006④">VisualSampleEntry</a> in <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a>.</p>
+   <h3 class="heading settled" data-level="2.3" id="av1codecconfigurationbox-section"><span class="secno">2.3. </span><span class="content">AV1 Codec Configuration Box</span><a class="self-link" href="#av1codecconfigurationbox-section"></a></h3>
+   <h4 class="heading settled" data-level="2.3.1" id="av1codecconfigurationbox-definition"><span class="secno">2.3.1. </span><span class="content">Definition</span><a class="self-link" href="#av1codecconfigurationbox-definition"></a></h4>
+<pre class="def">Box Type:  <dfn data-dfn-type="dfn" data-export id="av1c">av1C<a class="self-link" href="#av1c"></a></dfn>
+Container: AV1 Sample Entry ('av01')
+Mandatory: Yes
+Quantity:  Exactly One
+</pre>
+   <h4 class="heading settled" data-level="2.3.2" id="av1codecconfigurationbox-description"><span class="secno">2.3.2. </span><span class="content">Description</span><a class="self-link" href="#av1codecconfigurationbox-description"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1codecconfigurationbox">AV1CodecConfigurationBox</dfn> contains decoder configuration information that SHALL be valid for every sample that references the sample entry.</p>
+   <h4 class="heading settled" data-level="2.3.3" id="av1codecconfigurationbox-syntax"><span class="secno">2.3.3. </span><span class="content">Syntax</span><a class="self-link" href="#av1codecconfigurationbox-syntax"></a></h4>
+<pre>class AV1CodecConfigurationBox extends Box('av1C'){
+  AV1CodecConfigurationRecord av1Config;
+}
+
+aligned (8) class AV1CodecConfigurationRecord {
+  unsigned int (1) marker = 1;
+  unsigned int (7) version = 1;
+  unsigned int (3) seq_profile;
+  unsigned int (5) seq_level_idx_0;
+  unsigned int (1) seq_tier_0;
+  unsigned int (1) high_bitdepth;
+  unsigned int (1) twelve_bit;
+  unsigned int (1) monochrome;
+  unsigned int (1) chroma_subsampling_x;
+  unsigned int (1) chroma_subsampling_y;
+  unsigned int (2) chroma_sample_position;
+  unsigned int (3) reserved = 0;
+
+  unsigned int (1) initial_presentation_delay_present;
+  if (initial_presentation_delay_present) {
+    unsigned int (4) initial_presentation_delay_minus_one;
+  } else {
+    unsigned int (4) reserved = 0;
+  }
+
+  unsigned int (8)[] configOBUs;
+}
+</pre>
+   <h4 class="heading settled" data-level="2.3.4" id="av1codecconfigurationbox-semantics"><span class="secno">2.3.4. </span><span class="content">Semantics</span><a class="self-link" href="#av1codecconfigurationbox-semantics"></a></h4>
+   <p>The <dfn data-dfn-type="dfn" data-export id="marker">marker<a class="self-link" href="#marker"></a></dfn> field SHALL be set to 1.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> The marker bit ensures that the bit pattern of the first byte of the AV1CodecConfigurationRecord cannot be mistaken for an <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40" id="ref-for-page=40">OBU Header</a> byte.</p>
+   <p>The <dfn data-dfn-type="dfn" data-noexport id="version">version<a class="self-link" href="#version"></a></dfn> field indicates the version of the AV1CodecConfigurationRecord. The value SHALL be set to 1 for AV1CodecConfigurationRecord.</p>
+   <p>The <dfn data-dfn-type="dfn" data-export id="seq_profile">seq_profile<a class="self-link" href="#seq_profile"></a></dfn> field indicates the AV1 profile and SHALL be equal to the seq_profile value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②">Sequence Header OBU</a>.</p>
+   <p>The <dfn data-dfn-type="dfn" data-export id="seq_level_idx_0">seq_level_idx_0<a class="self-link" href="#seq_level_idx_0"></a></dfn> field indicates the value of seq_level_idx[0] found in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③">Sequence Header OBU</a> and SHALL be equal to the value of seq_level_idx[0] in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41④">Sequence Header OBU</a>.</p>
+   <p>The <dfn data-dfn-type="dfn" data-export id="seq_tier_0">seq_tier_0<a class="self-link" href="#seq_tier_0"></a></dfn> field indicates the value of seq_tier[0] found in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑤">Sequence Header OBU</a> and SHALL be equal to the value of seq_tier[0] in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑥">Sequence Header OBU</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="high_bitdepth">high_bitdepth</dfn> field indicates the value of the <a data-link-type="dfn" href="#high_bitdepth" id="ref-for-high_bitdepth">high_bitdepth</a> flag from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑦">Sequence Header OBU</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="twelve_bit">twelve_bit</dfn> field indicates the value of the <a data-link-type="dfn" href="#twelve_bit" id="ref-for-twelve_bit">twelve_bit</a> flag from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑧">Sequence Header OBU</a>. When twelve_bit is not present in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑨">Sequence Header OBU</a> the AV1CodecConfigurationRecord twelve_bit value SHALL be 0.</p>
+   <p>The <dfn data-dfn-type="dfn" data-export id="monochrome">monochrome<a class="self-link" href="#monochrome"></a></dfn> field indicates the value of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑧">mono_chrome</a> flag from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⓪">Sequence Header OBU</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="chroma_subsampling_x">chroma_subsampling_x</dfn> field indicates the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑨">subsampling_x</a> value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①①">Sequence Header OBU</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="chroma_subsampling_y">chroma_subsampling_y</dfn> field indicates the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⓪">subsampling_y</a> value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①②">Sequence Header OBU</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="chroma_sample_position">chroma_sample_position</dfn> field indicates the <a data-link-type="dfn" href="#chroma_sample_position" id="ref-for-chroma_sample_position">chroma_sample_position</a> value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①③">Sequence Header OBU</a>.</p>
+   <p>When not specified in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①④">Sequence Header OBU</a>, and not defined by the conditions specified in the <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44" id="ref-for-page=44">color_config</a>, the values of <a data-link-type="dfn" href="#chroma_subsampling_x" id="ref-for-chroma_subsampling_x">chroma_subsampling_x</a>, <a data-link-type="dfn" href="#chroma_subsampling_y" id="ref-for-chroma_subsampling_y">chroma_subsampling_y</a>, and <a data-link-type="dfn" href="#chroma_sample_position" id="ref-for-chroma_sample_position①">chroma_sample_position</a> SHALL be 0.</p>
+   <p>The <dfn data-dfn-type="dfn" data-export id="initial_presentation_delay_present">initial_presentation_delay_present<a class="self-link" href="#initial_presentation_delay_present"></a></dfn> field indicates the presence of the initial_presentation_delay_minus_one field.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="initial_presentation_delay_minus_one">initial_presentation_delay_minus_one</dfn> field indicates the number of samples (minus one) that need to be decoded prior to starting the presentation of the first sample associated with this sample entry in order to guarantee that each sample will be decoded prior to its presentation time under the constraints of the first level value indicated by <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①①">seq_level_idx</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑤">Sequence Header OBU</a> (in the configOBUs field or in the associated samples). More precisely, the following procedure SHALL not return any error:</p>
+   <ul>
+    <li data-md>
+     <p>construct a hypothetical bitstream consisting of the OBUs carried in the sample entry followed by the OBUs carried in all the samples referring to that sample entry,</p>
+    <li data-md>
+     <p>set the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①②">initial_display_delay_minus_1</a> field of each <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑥">Sequence Header OBU</a> to the number of frames minus one contained in the first <a data-link-type="dfn" href="#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one">initial_presentation_delay_minus_one</a> + 1 samples,</p>
+    <li data-md>
+     <p>set the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①③">frame_presentation_time</a> field of the frame header of each presentable frame such that it matches the presentation time difference between the sample carrying this frame and the previous sample (if it exists, 0 otherwise),</p>
+    <li data-md>
+     <p>apply the decoder model specified in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a> to this hypothetical bitstream using the first operating point. If <code>buffer_removal_time</code> information is present in bitstream for this operating point, the decoding schedule mode SHALL be applied, otherwise the resource availability mode SHALL be applied.</p>
+   </ul>
+   <p class="note" role="note"><span class="marker">NOTE:</span> With the above procedure, when smooth presentation can be guaranteed after decoding the first sample, initial_presentation_delay_minus_one is 0.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> Because the above procedure considers all OBUs in all samples associated with a sample entry, if these OBUS form multiple coded video sequences which would have different values of <code>initial_presentation_delay_minus_one</code> if considered separately, the sample entry would signal the larger value.</p>
+   <div class="example" id="example-27bde372">
+    <a class="self-link" href="#example-27bde372"></a> The difference between <a data-link-type="dfn" href="#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one①">initial_presentation_delay_minus_one</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①④">initial_display_delay_minus_1</a> can be illustrated by considering the following example: 
+<pre>a b c d e f g h
+</pre>
+    where letters correspond to frames. Assume that <code><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑤">initial_display_delay_minus_1</a></code> is 2, i.e. that once frame <code>c</code> has been decoded, all other frames in the bitstream can be presented on time. If those frames were grouped into temporal units and samples as follows: 
+<pre>[a] [b c d] [e] [f] [g] [h]
+</pre>
+    <code><a data-link-type="dfn" href="#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one②">initial_presentation_delay_minus_one</a></code> would be 1 because it takes presentation of 2 samples to ensure that <code>c</code> is decoded.
+But if the frames were grouped as follows: 
+<pre>[a] [b] [c] [d e f] [g] [h]
+</pre>
+    <code><a data-link-type="dfn" href="#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one③">initial_presentation_delay_minus_one</a></code> would be 2 because it takes presentation of 3 samples to ensure that <code>c</code> is decoded. 
+   </div>
+   <p>The <dfn data-dfn-type="dfn" data-export id="configobus">configOBUs<a class="self-link" href="#configobus"></a></dfn> field contains zero or more OBUs. Any OBU may be present provided that the following procedures produce compliant AV1 bitstreams:</p>
+   <ul>
+    <li data-md>
+     <p>From any sync sample, an AV1 bitstream is formed by first outputting the OBUs contained in the <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox③">AV1CodecConfigurationBox</a> and then by outputing all OBUs in the samples themselves, in order, starting from the sync sample.</p>
+    <li data-md>
+     <p>From any sample marked with the <a data-link-type="dfn" href="#av1forwardkeyframesamplegroupentry" id="ref-for-av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</a>, an AV1 bitstream is formed by first outputting the OBUs contained in the <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox④">AV1CodecConfigurationBox</a> and then by outputing all OBUs in the sample itself, then by outputting all OBUs in the samples, in order, starting from the sample at the distance indicated by the sample group.</p>
+   </ul>
+   <p>Additionally, the configOBUs field SHALL contain at most one <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑦">Sequence Header OBU</a> and if present, it SHALL be the first OBU.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> The configOBUs field is expected to contain only one <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑧">Sequence Header OBU</a> and zero or more <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46">Metadata OBUs</a> when applicable to all the associated samples.</p>
+   <p>OBUs stored in the configOBUs field follow the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑥">open_bitstream_unit</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39①">Low Overhead Bitstream Format</a> syntax as specified in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a>. The flag <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑦">obu_has_size_field</a> SHALL be set to 1, indicating that the size of the OBU payload follows the header, and that it is coded using LEB128.</p>
+   <p>When a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑨">Sequence Header OBU</a> is contained within the configOBUs of the AV1CodecConfigurationRecord, the values present in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⓪">Sequence Header OBU</a> contained within configOBUs SHALL match the values of the AV1CodecConfigurationRecord.</p>
+   <p>The presentation times of AV1 samples are given by the ISOBMFF structures. The <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑧">timing_info_present_flag</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②①">Sequence Header OBU</a> (in the configOBUs field or in the associated samples) SHOULD be set to 0. If set to 1, the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45" id="ref-for-page=45">timing_info</a> structure of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②②">Sequence Header OBU</a>, the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑨">frame_presentation_time</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⓪">buffer_removal_time</a> fields of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49">Frame Header OBUs</a>, if present, SHALL be ignored for the purpose of timed processing of the ISOBMFF file.</p>
+   <p>The sample entry SHOULD contain a <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑤">colr</a> box with a colour_type set to <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑥">nclx</a>. If present, the values of colour_primaries, transfer_characteristics, and matrix_coefficients SHALL match the values given in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②③">Sequence Header OBU</a> (in the configOBUs field or in the associated samples) if the color_description_present_flag is set to 1. Similarly, the full_range_flag in the <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑦">colr</a> box shall match the color_range flag in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②④">Sequence Header OBU</a>. When configOBUs does not contain a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑤">Sequence Header OBU</a>, this box with colour_type set to <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑧">nclx</a> SHALL be present.</p>
+   <p>The CleanApertureBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑨">clap</a> SHOULD not be present.</p>
+   <p>For sample entries corresponding to HDR content, the MasteringDisplayColourVolumeBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①⓪">mdcv</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①①">clli</a> SHOULD be present, and their values SHALL match the values of contained in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46①">Metadata OBUs</a> of type METADATA_TYPE_HDR_CLL and METADATA_TYPE_HDR_MDCV, if present (in the configOBUs or in the samples).</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> The MasteringDisplayColourVolumeBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①②">mdcv</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①③">clli</a> have identical syntax to the SMPTE2086MasteringDisplayMetadataBox <a class="property css" data-link-type="property" href="https://www.webmproject.org/vp9/mp4/#" id="ref-for-37f26709df4ef02bccacdfb3c0626342">SmDm</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.webmproject.org/vp9/mp4/#" id="ref-for-37f26709df4ef02bccacdfb3c0626342①">CoLL</a>, except that they are of type <code>Box</code> and not <code>FullBox</code>. However, the semantics of the MasteringDisplayColourVolumeBox and SMPTE2086MasteringDisplayMetadataBox have important differences and should not be confused.</p>
+   <p>Additional boxes may be provided at the end of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①④">VisualSampleEntry</a> as permitted by ISOBMFF, that may represent redundant or similar information to the one provided in some OBUs contained in the <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox⑤">AV1CodecConfigurationBox</a>. If the box definition does not indicate that its information overrides the OBU information, in case of conflict, the OBU information should be considered authoritative.</p>
+   <h3 class="heading settled" data-level="2.4" id="sampleformat"><span class="secno">2.4. </span><span class="content">AV1 Sample Format</span><a class="self-link" href="#sampleformat"></a></h3>
+   <p>For tracks using the <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry②">AV1SampleEntry</a>, an <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1-sample">AV1 Sample</dfn> has the following constraints:</p>
+   <ul>
+    <li data-md>
+     <p>the sample data SHALL be a sequence of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39②">OBUs</a> forming a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑤">Temporal Unit</a>,</p>
+    <li data-md>
+     <p>each OBU SHALL follow the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②①">open_bitstream_unit</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39③">Low Overhead Bitstream Format</a> syntax as specified in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a>. Each OBU SHALL have the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②②">obu_has_size_field</a> set to 1 except for the last OBU in the sample, for which <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②③">obu_has_size_field</a> MAY be set to 0, in which case it is assumed to fill the remainder of the sample,</p>
+   </ul>
+   <p class="note" role="note"><span class="marker">NOTE:</span> When extracting OBUs from an ISOBMFF file, and depending on the capabilities of the decoder processing these OBUs, ISOBMFF parsers MAY need to either: set the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②④">obu_has_size_field</a> to 1 for some OBUs if not already set, add the size field in this case, and add <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46②">Temporal Delimiter OBU</a>; or use the length-delimited bitstream format as defined in Annex B of <a data-link-type="dfn" href="#av1s" id="ref-for-av1s">AV1</a>. If encryption is used, similar operations MAY have to be done before or after decryption depending on the demuxer/decryptor/decoder architecture.</p>
+   <ul>
+    <li data-md>
+     <p>OBU trailing bits SHOULD be limited to byte alignment and SHOULD not be used for padding,</p>
+    <li data-md>
+     <p>OBUs of type OBU_TEMPORAL_DELIMITER, OBU_PADDING, or OBU_REDUNDANT_FRAME_HEADER SHOULD NOT be used.</p>
+    <li data-md>
+     <p>OBUs of type OBU_TILE_LIST SHALL NOT be used.</p>
+   </ul>
+   <p>If an AV1 Sample is signaled as a sync sample (in the SyncSampleBox or by setting sample_is_non_sync_sample to 0), it SHALL be a Random Access Point as defined in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a>, i.e. satisfy the following constraints:</p>
+   <ul>
+    <li data-md>
+     <p>Its first frame is a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑥">Key Frame</a> that has <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑤">show_frame</a> flag set to 1,</p>
+    <li data-md>
+     <p>It contains a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑥">Sequence Header OBU</a> before the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49①">Frame Header OBU</a>.</p>
+   </ul>
+   <p class="note" role="note"><span class="marker">NOTE:</span> Within this definition, a sync sample may contain additional frames that are not Key Frames. The fact that none of them is the first frame in the temporal unit ensures that they are decodable.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> Other types of OBUs such as <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46③">metadata OBUs</a> could be present before the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑦">Sequence Header OBU</a>.</p>
+   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑦">Intra-only frames</a> SHOULD be signaled using the sample_depends_on flag set to 2.</p>
+   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑦">Delayed Random Access Points</a> SHOULD be signaled using sample groups and the <a data-link-type="dfn" href="#av1forwardkeyframesamplegroupentry" id="ref-for-av1forwardkeyframesamplegroupentry①">AV1ForwardKeyFrameSampleGroupEntry</a>.</p>
+   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑧">Switch Frames</a> SHOULD be signaled using sample groups and the <a data-link-type="dfn" href="#av1switchframesamplegroupentry" id="ref-for-av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</a>.</p>
+   <p>Additionally, if a file contains multiple tracks that are alternative representations of the same content, in particular using <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑨">Switch Frames</a>, those tracks SHOULD be marked as belonging to the same alternate group and should use a track selection box with an appropriate attribute (e.g. <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①⑤">bitr</a>).</p>
+   <p>In tracks using the <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry③">AV1SampleEntry</a>, the <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①⑥">ctts</a> box and composition offsets in movie fragments SHALL NOT be used. Similarly, the is_leading flag, if used, SHALL be set to 0 or 2.</p>
+   <p>When a temporal unit contains more than one frame, the sample corresponding to that temporal unit MAY be marked using the <a data-link-type="dfn" href="#av1multiframesamplegroupentry" id="ref-for-av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</a>.</p>
+   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46④">Metadata OBUs</a> may be carried in sample data. In this case, the <a data-link-type="dfn" href="#av1metadatasamplegroupentry" id="ref-for-av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</a> SHOULD be used. If the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑤">metadata OBUs</a> are static for the entire set of samples associated with a given sample description entry, they SHOULD also be in the OBU array in the sample description entry.</p>
+   <p>Unless explicitely stated, the grouping_type_parameter is not defined for the SampleToGroupBox with grouping types defined in this specification.</p>
+   <h3 class="heading settled" data-level="2.5" id="forwardkeyframesamplegroupentry"><span class="secno">2.5. </span><span class="content">AV1 Forward Key Frame sample group entry</span><a class="self-link" href="#forwardkeyframesamplegroupentry"></a></h3>
+   <h4 class="heading settled" data-level="2.5.1" id="forwardkeyframesamplegroupentry-definition"><span class="secno">2.5.1. </span><span class="content">Definition</span><a class="self-link" href="#forwardkeyframesamplegroupentry-definition"></a></h4>
+<pre class="def">Group Type: <dfn data-dfn-type="dfn" data-export id="av1f">av1f<a class="self-link" href="#av1f"></a></dfn>
+Container:  Sample Group Description Box ('sgpd')
+Mandatory:  No
+Quantity:   Zero or more.
+</pre>
+   <h4 class="heading settled" data-level="2.5.2" id="forwardkeyframesamplegroupentry-description"><span class="secno">2.5.2. </span><span class="content">Description</span><a class="self-link" href="#forwardkeyframesamplegroupentry-description"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</dfn> documents samples that contain a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑧">Delayed Random Access Point</a> that are followed at a given distance in the bitstream by a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑨">Key Frame Dependent Recovery Point</a>.</p>
+   <h4 class="heading settled" data-level="2.5.3" id="forwardkeyframesamplegroupentry-syntax"><span class="secno">2.5.3. </span><span class="content">Syntax</span><a class="self-link" href="#forwardkeyframesamplegroupentry-syntax"></a></h4>
+<pre>class AV1ForwardKeyFrameSampleGroupEntry extends VisualSampleGroupEntry('av1f') {
+  unsigned int(8) fwd_distance;
+}
+</pre>
+   <h4 class="heading settled" data-level="2.5.4" id="forwardkeyframesamplegroupentry-semantics"><span class="secno">2.5.4. </span><span class="content">Semantics</span><a class="self-link" href="#forwardkeyframesamplegroupentry-semantics"></a></h4>
+   <p>The <dfn data-dfn-type="dfn" data-export id="fwd_distance">fwd_distance<a class="self-link" href="#fwd_distance"></a></dfn> field indicates the number of samples between this sample and the next sample containing the associated <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206①⓪">Key Frame Dependent Recovery Point</a>. 0 means the next sample.</p>
+   <h3 class="heading settled" data-level="2.6" id="multiframesamplegroupentry"><span class="secno">2.6. </span><span class="content">AV1 Multi-Frame sample group entry</span><a class="self-link" href="#multiframesamplegroupentry"></a></h3>
+   <h4 class="heading settled" data-level="2.6.1" id="multiframesamplegroupentry-definition"><span class="secno">2.6.1. </span><span class="content">Definition</span><a class="self-link" href="#multiframesamplegroupentry-definition"></a></h4>
+<pre class="def">Group Type: <dfn data-dfn-for="AV1MultiFrameSampleGroupEntry" data-dfn-type="value" data-export id="valdef-av1multiframesamplegroupentry-av1m">av1m<a class="self-link" href="#valdef-av1multiframesamplegroupentry-av1m"></a></dfn>
+Container:  Sample Group Description Box ('sgpd')
+Mandatory:  No
+Quantity:   Zero or more.
+</pre>
+   <h4 class="heading settled" data-level="2.6.2" id="multiframesamplegroupentry-description"><span class="secno">2.6.2. </span><span class="content">Description</span><a class="self-link" href="#multiframesamplegroupentry-description"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</dfn> documents samples that contain multiple frames.</p>
+   <h4 class="heading settled" data-level="2.6.3" id="multiframesamplegroupentry-syntax"><span class="secno">2.6.3. </span><span class="content">Syntax</span><a class="self-link" href="#multiframesamplegroupentry-syntax"></a></h4>
+<pre>class AV1MultiFrameSampleGroupEntry extends VisualSampleGroupEntry('av1m') {
+}
+</pre>
+   <h3 class="heading settled" data-level="2.7" id="switchframesamplegroupentry"><span class="secno">2.7. </span><span class="content">AV1 Switch Frame sample group entry</span><a class="self-link" href="#switchframesamplegroupentry"></a></h3>
+   <h4 class="heading settled" data-level="2.7.1" id="switchframesamplegroupentry-definition"><span class="secno">2.7.1. </span><span class="content">Definition</span><a class="self-link" href="#switchframesamplegroupentry-definition"></a></h4>
+<pre class="def">Group Type: <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="av1s">av1s</dfn>
+Container:  Sample Group Description Box ('sgpd')
+Mandatory:  No
+Quantity:   Zero or more.
+</pre>
+   <h4 class="heading settled" data-level="2.7.2" id="switchframesamplegroupentry-description"><span class="secno">2.7.2. </span><span class="content">Description</span><a class="self-link" href="#switchframesamplegroupentry-description"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</dfn> documents samples that start with a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13①⓪">Switch Frame</a>.</p>
+   <h4 class="heading settled" data-level="2.7.3" id="switchframesamplegroupentry-syntax"><span class="secno">2.7.3. </span><span class="content">Syntax</span><a class="self-link" href="#switchframesamplegroupentry-syntax"></a></h4>
+<pre>class AV1SwitchFrameSampleGroupEntry extends VisualSampleGroupEntry('av1s') {
+}
+</pre>
+   <h3 class="heading settled" data-level="2.8" id="metadatasamplegroupentry"><span class="secno">2.8. </span><span class="content">AV1 Metadata sample group entry</span><a class="self-link" href="#metadatasamplegroupentry"></a></h3>
+   <h4 class="heading settled" data-level="2.8.1" id="metadatasamplegroupentry-definition"><span class="secno">2.8.1. </span><span class="content">Definition</span><a class="self-link" href="#metadatasamplegroupentry-definition"></a></h4>
+<pre class="def">Group Type: <dfn data-dfn-for="AV1MetadataSampleGroupEntry" data-dfn-type="value" data-noexport id="valdef-av1metadatasamplegroupentry-av1m">av1M<a class="self-link" href="#valdef-av1metadatasamplegroupentry-av1m"></a></dfn>
+Container:  Sample Group Description Box ('sgpd')
+Mandatory:  No
+Quantity:   Zero or more.
+</pre>
+   <h4 class="heading settled" data-level="2.8.2" id="metadatasamplegroupentry-description"><span class="secno">2.8.2. </span><span class="content">Description</span><a class="self-link" href="#metadatasamplegroupentry-description"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</dfn> documents samples that contain <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑥">metadata OBUs</a>. The <code>grouping_type_parameter</code> can be used to identify samples containing <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑦">metadata OBUs</a> of a given type. If no <code>grouping_type_parameter</code> is provided, the sample group entry identifies samples containing <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑧">metadata OBUs</a> for which the <code>metadata_type</code> is unknown.</p>
+   <h4 class="heading settled" data-level="2.8.3" id="metadatasamplegroupentry-syntax"><span class="secno">2.8.3. </span><span class="content">Syntax</span><a class="self-link" href="#metadatasamplegroupentry-syntax"></a></h4>
+<pre>class AV1MetadataSampleGroupEntry extends VisualSampleGroupEntry('av1M') {
+}
+</pre>
+   <p>For this sample group entry, the <code>grouping_type_parameter</code> syntax is as follows:</p>
+<pre>{
+   unsigned int (8) metadata_type;
+   unsigned int (24) metadata_specific_parameters;
+}
+</pre>
+   <h4 class="heading settled" data-level="2.8.4" id="metadatasamplegroupentry-semantics"><span class="secno">2.8.4. </span><span class="content">Semantics</span><a class="self-link" href="#metadatasamplegroupentry-semantics"></a></h4>
+   <p><dfn data-dfn-type="dfn" data-export id="metadata_type">metadata_type<a class="self-link" href="#metadata_type"></a></dfn> is a 8-bit field whose value is the value of the metadata_type field defined in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a>, when it is equal or lower than 255. metadata_type values above 255 are not supported by this sample group.</p>
+   <p><dfn data-dfn-type="dfn" data-export id="metadata_specific_parameters">metadata_specific_parameters<a class="self-link" href="#metadata_specific_parameters"></a></dfn> provides an additional part of the <code>grouping_type_parameter</code>, which MAY be used to distinguish different sample groups having the same <code>metadata_type</code> but different sub-parameters. In this version of the specification, <code>metadata_specific_parameters</code> is only defined when <code>metadata_type</code> is set to <code>METADATA_TYPE_ITUT_T35</code> in which case its value SHALL be set to the first 24 bits of the <code>metadata_itut_t35</code> structure. For other types of metadata, its value SHOULD be set to 0. In all cases, when the <code>grouping_type_parameter</code> is used, readers processing sample groups SHALL use the entire value of <code>grouping_type_parameter</code>.</p>
+   <h2 class="heading settled" data-level="3" id="cmaf"><span class="secno">3. </span><span class="content">CMAF AV1 track format</span><a class="self-link" href="#cmaf"></a></h2>
+   <p><a data-link-type="biblio" href="#biblio-cmaf" title="Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media">[CMAF]</a> defines structural constraints on ISOBMFF files additional to <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a> for the purpose of, for example, adaptive streaming or for protected files. Conformance to these structural constraints is signaled by the presence of the brand <code><a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="ref-for-1568b5183e757fdee5323510bdd1a120">cmfc</a></code> in the <code>FileTypeBox</code>.</p>
+   <p>If a <a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="ref-for-1568b5183e757fdee5323510bdd1a120①">CMAF Video Track</a> uses the brand <code>av01</code>, it is called a <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="cmaf-av1-track">CMAF AV1 Track</dfn> and the following constraints, defining the CMAF Media Profile for AV1, apply:</p>
+   <ul>
+    <li data-md>
+     <p>it SHALL use an <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry④">AV1SampleEntry</a></p>
+    <li data-md>
+     <p>it MAY use multiple sample entries, and in that case the following values SHALL not change in the track:</p>
+     <ul>
+      <li data-md>
+       <p><code>seq_profile</code></p>
+      <li data-md>
+       <p><code>still_picture</code></p>
+      <li data-md>
+       <p>the first value of <code>seq_level_idx</code></p>
+      <li data-md>
+       <p>the first value of <code>seq_tier</code></p>
+      <li data-md>
+       <p><code>color_config</code></p>
+      <li data-md>
+       <p><code>initial_presentation_delay_minus_one</code></p>
+     </ul>
+   </ul>
+   <p>When protected, <a data-link-type="dfn" href="#cmaf-av1-track" id="ref-for-cmaf-av1-track">CMAF AV1 Tracks</a> SHALL use the signaling defined in <a data-link-type="biblio" href="#biblio-cmaf" title="Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media">[CMAF]</a>, which in turn relies on <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a>, with the provisions specified in <a href="#CommonEncryption">§ 4 Common Encryption</a>.</p>
+   <h2 class="heading settled" data-level="4" id="CommonEncryption"><span class="secno">4. </span><span class="content">Common Encryption</span><a class="self-link" href="#CommonEncryption"></a></h2>
+   <p><a data-link-type="dfn" href="#cmaf-av1-track" id="ref-for-cmaf-av1-track①">CMAF AV1 Tracks</a> and non-segmented AV1 files MAY be protected. If protected, they SHALL conform to <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a>. Files SHOULD be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f">cbcs</a></code> protection scheme and MAY be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①">cenc</a></code> protection scheme.</p>
+   <p>When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f②">cenc</a></code> is used, samples SHALL be protected using subsample encryption and SHALL NOT use pattern encryption.</p>
+   <p>When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f③">cbcs</a></code> is used, samples SHALL be protected using subsample encryption and SHALL use pattern encryption. <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a> recommends that the Block Pattern length be 10, i.e. <code>crypt_byte_block + skip_byte_block = 10</code>, where a Block is of size 16-bytes. In this specification, the combination of <code>crypt_byte_block</code> and <code>skip_byte_block</code> SHALL be one of the following, with the first one being recommended:</p>
+   <ul>
+    <li data-md>
+     <p><code>crypt_byte_block = 1</code> and <code>skip_byte_block = 9</code>,</p>
+    <li data-md>
+     <p><code>crypt_byte_block = 5</code> and <code>skip_byte_block = 5</code>,</p>
+    <li data-md>
+     <p><code>crypt_byte_block = 10</code> and <code>skip_byte_block = 0</code>.</p>
+   </ul>
+   <h3 class="heading settled" data-level="4.1" id="subsample-encryption"><span class="secno">4.1. </span><span class="content">General Subsample Encryption constraints</span><a class="self-link" href="#subsample-encryption"></a></h3>
+   <p>Within protected samples, the following constraints apply:</p>
+   <ul>
+    <li data-md>
+     <p>Protected samples SHALL be exactly spanned by one or more contiguous subsamples.</p>
+     <ul>
+      <li data-md>
+       <p>An OBU MAY be spanned by one or more subsamples, especially when it has multiple ranges of protected data. However, as recommended in <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a>, writers SHOULD reduce the number of subsamples as possible. This can be achieved by using a subsample that spans multiple consecutive unprotected OBUs as well as the first unprotected and protected parts of the following protected OBU, if such protected OBU exists.</p>
+      <li data-md>
+       <p>A large unprotected OBU whose data size is larger than the maximum size of a single <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f④">BytesOfClearData</a> field MAY be spanned by multiple subsamples with zero size <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑤">BytesOfProtectedData</a>.</p>
+     </ul>
+    <li data-md>
+     <p>All <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40" id="ref-for-page=40①">OBU Headers</a> and associated <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑥">obu_size</a> fields SHALL be unprotected.</p>
+    <li data-md>
+     <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑨">Temporal Delimiter OBUs</a>, <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑧">Sequence Header OBUs</a>, and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49②">Frame Header OBUs</a> (including within a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71">Frame OBU</a>), <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121①">Redundant Frame Header OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121②">Padding OBUs</a> SHALL be unprotected.</p>
+    <li data-md>
+     <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46①⓪">Metadata OBUs</a> MAY be protected.</p>
+    <li data-md>
+     <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71①">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71②">Frame OBUs</a> SHALL be protected. Within <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71③">Tile Group OBUs</a> or <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71④">Frame OBUs</a>, the following applies:</p>
+     <ul>
+      <li data-md>
+       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑥">cbcs</a></code>:</p>
+       <ul>
+        <li data-md>
+         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑦">BytesOfProtectedData</a> SHALL start on the first byte and end on the last byte of the <code>decode_tile</code> structure (including any trailing bits).</p>
+       </ul>
+       <p class="note" role="note"><span class="marker">NOTE:</span> As a result of the above, <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑧">BytesOfProtectedData</a> is not necessarily a multiple of 16 bytes and partial blocks are included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑨">BytesOfProtectedData</a> range, but per <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a> the data is not be encrypted.</p>
+       <ul>
+        <li data-md>
+         <p>A subsample SHALL be created for each tile, even if its size is less than 16 bytes.</p>
+        <li data-md>
+         <p>All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑤">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑥">Frame OBUs</a> SHALL be unprotected.</p>
+       </ul>
+      <li data-md>
+       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①⓪">cenc</a></code>:</p>
+       <ul>
+        <li data-md>
+         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①①">BytesOfProtectedData</a> SHALL be a multiple of 16 bytes.</p>
+        <li data-md>
+         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①②">BytesOfProtectedData</a> SHALL end on the last byte of the <code>decode_tile</code> structure (including any trailing bits).</p>
+        <li data-md>
+         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①③">BytesOfProtectedData</a> SHALL span all complete 16-byte blocks of the <code>decode_tile</code> structure (including any trailing bits).</p>
+       </ul>
+       <p class="note" role="note"><span class="marker">NOTE:</span> As a result of the above, partial blocks are not used and it is possible that <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①④">BytesOfProtectedData</a> does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.</p>
+       <ul>
+        <li data-md>
+         <p>A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes. If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①⑤">BytesOfClearData</a> field of a surrounding subsample, if any.</p>
+        <li data-md>
+         <p>All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑦">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑧">Frame OBUs</a> SHALL be unprotected.</p>
+       </ul>
+     </ul>
+   </ul>
+   <h3 class="heading settled" data-level="4.2" id="subsample-encryption-illustration"><span class="secno">4.2. </span><span class="content">Subsample Encryption Illustration</span><a class="self-link" href="#subsample-encryption-illustration"></a></h3>
+    Figure #1 illustrates Subsample based encryption of AV1. 
+   <figure>
+     <img alt="Subsample-based AV1 encryption" src="images/subsample_encryption.svg"> 
+    <figcaption>Subsample-based AV1 encryption.</figcaption>
+   </figure>
+   <h2 class="heading settled" data-level="5" id="codecsparam"><span class="secno">5. </span><span class="content">Codecs Parameter String</span><a class="self-link" href="#codecsparam"></a></h2>
+   <p>DASH and other applications require defined values for the <a class="property css" data-link-type="property" href="https://tools.ietf.org/html/rfc6381#" id="ref-for-df8441526d3bbb5086bd93c1fae005b3">Codecs</a> parameter specified in <a data-link-type="biblio" href="#biblio-rfc6381" title="The &apos;Codecs&apos; and &apos;Profiles&apos; Parameters for &quot;Bucket&quot; Media Types">[RFC6381]</a> for ISO Media tracks. The codecs parameter string for the AOM AV1 codec is as follows:</p>
+<pre>&lt;sample entry 4CC>.&lt;profile>.&lt;level>&lt;tier>.&lt;bitDepth>.&lt;monochrome>.&lt;chromaSubsampling>.
+&lt;colorPrimaries>.&lt;transferCharacteristics>.&lt;matrixCoefficients>.&lt;videoFullRangeFlag>
+</pre>
+   <p>All fields following the sample entry 4CC are expressed as double digit decimals, unless indicated otherwise. Leading or trailing zeros cannot be omitted.</p>
+   <p>The profile parameter value, represented by a single digit decimal, SHALL equal the value of seq_profile in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑨">Sequence Header OBU</a>.</p>
+   <p>The level parameter value SHALL equal the first level value indicated by <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑦">seq_level_idx</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③⓪">Sequence Header OBU</a>.</p>
+   <p>The tier parameter value SHALL be equal to <code>M</code> when the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑧">seq_tier</a> value in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③①">Sequence Header OBU</a> is equal to 0, and <code>H</code> when it is equal to 1.</p>
+   <p>The bitDepth parameter value SHALL equal the value of BitDepth variable as defined in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a> derived from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③②">Sequence Header OBU</a>.</p>
+   <p>The monochrome parameter value, represented by a single digit decimal, SHALL equal the value of mono_chrome in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③③">Sequence Header OBU</a>.</p>
+   <p>The chromaSubsampling parameter value, represented by a three-digit decimal, SHALL have its first digit equal to subsampling_x and its second digit equal to subsampling_y. If both subsampling_x and subsampling_y are set to 1, then the third digit SHALL be equal to chroma_sample_position, otherwise it SHALL be set to 0.</p>
+   <p>The colorPrimaries, transferCharacteristics, matrixCoefficients, and videoFullRangeFlag parameter values SHALL equal the value of matching fields in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③④">Sequence Header OBU</a>, if color_description_present_flag is set to 1, otherwise they SHOULD not be set, defaulting to the values below. The videoFullRangeFlag is represented by a single digit.</p>
+   <p>For example, codecs="av01.0.04M.10.0.112.09.16.09.0" represents AV1 Main Profile, level 3.0, Main tier, 10-bit content, non-monochrome, with 4:2:0 chroma subsampling co-located with (0, 0) luma sample, ITU-R BT.2100 color primaries, ITU-R BT.2100 PQ transfer characteristics, ITU-R BT.2100 YCbCr color matrix, and studio swing representation.</p>
+   <p>The parameters sample entry 4CC, profile, level, tier, and bitDepth are all mandatory fields. If any of these fields are empty, or not within their allowed range, the processing device SHOULD treat it as an error.</p>
+   <p>All the other fields (including their leading '.') are optional, mutually inclusive (all or none) fields. If not specified then the values listed in the table below are assumed.</p>
+   <table class="def">
+    <tbody>
+     <tr>
+      <td>mono_chrome
+      <td>0
+     <tr>
+      <td>chromaSubsampling
+      <td>110 (4:2:0)
+     <tr>
+      <td>colorPrimaries
+      <td>1 (ITU-R BT.709)
+     <tr>
+      <td>transferCharacteristics
+      <td>1 (ITU-R BT.709)
+     <tr>
+      <td>matrixCoefficients
+      <td>1 (ITU-R BT.709)
+     <tr>
+      <td>videoFullRangeFlag
+      <td>0 (studio swing representation)
+   </table>
+   <p>The string codecs="av01.0.01M.08" in this case would represent AV1 Main Profile, level 2.1, Main tier, 8-bit content with 4:2:0 chroma subsampling, ITU-R BT.709 color primaries, transfer characteristics, matrix coefficients, and studio swing representation.</p>
+   <p>If any character that is not '.', digits, part of the AV1 4CC, or a tier value is encountered, the string SHALL be interpreted ignoring all the characters starting from that character.</p>
+   <h2 class="heading settled" data-level="6" id="changelist"><span class="secno">6. </span><span class="content">Changes since v1.1.0 release</span><a class="self-link" href="#changelist"></a></h2>
+   <ul>
+    <li data-md>
+     <p><a href="https://github.com/AOMediaCodec/av1-isobmff/pull/116"> Change tile/subsample alignement for the <code>cbcs</code> protection scheme.</a></p>
+   </ul>
+  </main>
+  <div data-fill-with="conformance">
+   <h2 class="no-ref no-num heading settled" id="conformance"><span class="content"> Conformance</span><a class="self-link" href="#conformance"></a></h2>
+   <p> Conformance requirements are expressed with a combination of descriptive assertions and RFC 2119 terminology.
+            The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL”
+            in the normative parts of this document
+            are to be interpreted as described in RFC 2119.
+            However, for readability,
+            these words do not appear in all uppercase letters in this specification. </p>
+   <p> All of the text of this specification is normative
+            except sections explicitly marked as non-normative, examples, and notes. <a data-link-type="biblio" href="#biblio-rfc2119" title="Key words for use in RFCs to Indicate Requirement Levels">[RFC2119]</a> </p>
+   <p> Examples in this specification are introduced with the words “for example”
+            or are set apart from the normative text with <code>class="example"</code>, like this: </p>
+   <div class="example" id="example-example"><a class="self-link" href="#example-example"></a> This is an example of an informative example. </div>
+   <p> Informative notes begin with the word “Note”
+            and are set apart from the normative text with <code>class="note"</code>, like this: </p>
+   <p class="note" role="note"> Note, this is an informative note.</p>
+  </div>
+<script>
+(function() {
+  "use strict";
+  var collapseSidebarText = '<span aria-hidden="true">←</span> '
+                          + '<span>Collapse Sidebar</span>';
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+                          + '<span>Jump to Table of Contents</span>';
+
+  var sidebarMedia = window.matchMedia('screen and (min-width: 78em)');
+  var autoToggle   = function(e){ toggleSidebar(e.matches) };
+  if(sidebarMedia.addListener) {
+    sidebarMedia.addListener(autoToggle);
+  }
+
+  function toggleSidebar(on) {
+    if (on == undefined) {
+      on = !document.body.classList.contains('toc-sidebar');
+    }
+
+    /* Don’t scroll to compensate for the ToC if we’re above it already. */
+    var headY = 0;
+    var head = document.querySelector('.head');
+    if (head) {
+      // terrible approx of "top of ToC"
+      headY += head.offsetTop + head.offsetHeight;
+    }
+    var skipScroll = window.scrollY < headY;
+
+    var toggle = document.getElementById('toc-toggle');
+    var tocNav = document.getElementById('toc');
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+      var tocHeight = tocNav.offsetHeight;
+      document.body.classList.add('toc-sidebar');
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+      if (!skipScroll) {
+        window.scrollBy(0, 0 - tocHeight);
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+      tocNav.focus();
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+      document.body.classList.add('toc-inline');
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+        window.scrollBy(0, tocNav.offsetHeight);
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+        /* Unfocus button when not using keyboard navigation,
+           because I don’t know where else to send the focus. */
+        toggle.blur();
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+  }
+
+  function createSidebarToggle() {
+    /* Create the sidebar toggle in JS; it shouldn’t exist when JS is off. */
+    var toggle = document.createElement('a');
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+    toggle.class = 'toc-toggle';
+    toggle.href = '#toc';
+    toggle.innerHTML = collapseSidebarText;
+
+    sidebarMedia.addListener(autoToggle);
+    var toggler = function(e) {
+      e.preventDefault();
+      sidebarMedia.removeListener(autoToggle); // persist explicit off states
+      toggleSidebar();
+      return false;
+    }
+    toggle.addEventListener('click', toggler, false);
+
+
+    /* Get <nav id=toc-nav>, or make it if we don’t have one. */
+    var tocNav = document.getElementById('toc-nav');
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+      /* Prepend for better keyboard navigation */
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+    /* While we’re at it, make sure we have a Jump to Toc link. */
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+      tocNav.appendChild(tocJump);
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+
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+
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+  if (toc) {
+    createSidebarToggle();
+    toggleSidebar(sidebarMedia.matches);
+
+    /* If the sidebar has been manually opened and is currently overlaying the text
+       (window too small for the MQ to add the margin to body),
+       then auto-close the sidebar once you click on something in there. */
+    toc.addEventListener('click', function(e) {
+      if(e.target.tagName.toLowerCase() == "a" && document.body.classList.contains('toc-sidebar') && !sidebarMedia.matches) {
+        toggleSidebar(false);
+      }
+    }, false);
+  }
+  else {
+    console.warn("Can’t find Table of Contents. Please use <nav id='toc'> around the ToC.");
+  }
+
+  /* Wrap tables in case they overflow */
+  var tables = document.querySelectorAll(':not(.overlarge) > table.data, :not(.overlarge) > table.index');
+  var numTables = tables.length;
+  for (var i = 0; i < numTables; i++) {
+    var table = tables[i];
+    var wrapper = document.createElement('div');
+    wrapper.className = 'overlarge';
+    table.parentNode.insertBefore(wrapper, table);
+    wrapper.appendChild(table);
+  }
+
+})();
+</script>
+  <h2 class="no-num no-ref heading settled" id="index"><span class="content">Index</span><a class="self-link" href="#index"></a></h2>
+  <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="content">Terms defined by this specification</span><a class="self-link" href="#index-defined-here"></a></h3>
+  <ul class="index">
+   <li>
+    av01
+    <ul>
+     <li><a href="#valdef-av1sampleentry-av01">value for AV1SampleEntry</a><span>, in § 2.2.1</span>
+     <li><a href="#valdef-isobmff-brand-av01">value for ISOBMFF Brand</a><span>, in § 2.1</span>
+    </ul>
+   <li><a href="#av1c">av1C</a><span>, in § 2.3.1</span>
+   <li><a href="#av1codecconfigurationbox">AV1CodecConfigurationBox</a><span>, in § 2.3.2</span>
+   <li><a href="#av1f">av1f</a><span>, in § 2.5.1</span>
+   <li><a href="#av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</a><span>, in § 2.5.2</span>
+   <li><a href="#valdef-av1metadatasamplegroupentry-av1m">av1M</a><span>, in § 2.8.1</span>
+   <li><a href="#valdef-av1multiframesamplegroupentry-av1m">av1m</a><span>, in § 2.6.1</span>
+   <li><a href="#av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</a><span>, in § 2.8.2</span>
+   <li><a href="#av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</a><span>, in § 2.6.2</span>
+   <li><a href="#av1s">av1s</a><span>, in § 2.7.1</span>
+   <li><a href="#av1-sample">AV1 Sample</a><span>, in § 2.4</span>
+   <li><a href="#av1sampleentry">AV1SampleEntry</a><span>, in § 2.2.2</span>
+   <li><a href="#av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</a><span>, in § 2.7.2</span>
+   <li><a href="#chroma_sample_position">chroma_sample_position</a><span>, in § 2.3.4</span>
+   <li><a href="#chroma_subsampling_x">chroma_subsampling_x</a><span>, in § 2.3.4</span>
+   <li><a href="#chroma_subsampling_y">chroma_subsampling_y</a><span>, in § 2.3.4</span>
+   <li><a href="#cmaf-av1-track">CMAF AV1 Track</a><span>, in § 3</span>
+   <li><a href="#compressorname">compressorname</a><span>, in § 2.2.4</span>
+   <li><a href="#config">config</a><span>, in § 2.2.4</span>
+   <li><a href="#configobus">configOBUs</a><span>, in § 2.3.4</span>
+   <li><a href="#fwd_distance">fwd_distance</a><span>, in § 2.5.4</span>
+   <li><a href="#height">height</a><span>, in § 2.2.4</span>
+   <li><a href="#high_bitdepth">high_bitdepth</a><span>, in § 2.3.4</span>
+   <li><a href="#initial_presentation_delay_minus_one">initial_presentation_delay_minus_one</a><span>, in § 2.3.4</span>
+   <li><a href="#initial_presentation_delay_present">initial_presentation_delay_present</a><span>, in § 2.3.4</span>
+   <li><a href="#marker">marker</a><span>, in § 2.3.4</span>
+   <li><a href="#metadata_specific_parameters">metadata_specific_parameters</a><span>, in § 2.8.4</span>
+   <li><a href="#metadata_type">metadata_type</a><span>, in § 2.8.4</span>
+   <li><a href="#monochrome">monochrome</a><span>, in § 2.3.4</span>
+   <li><a href="#seq_level_idx_0">seq_level_idx_0</a><span>, in § 2.3.4</span>
+   <li><a href="#seq_profile">seq_profile</a><span>, in § 2.3.4</span>
+   <li><a href="#seq_tier_0">seq_tier_0</a><span>, in § 2.3.4</span>
+   <li><a href="#twelve_bit">twelve_bit</a><span>, in § 2.3.4</span>
+   <li><a href="#version">version</a><span>, in § 2.3.4</span>
+   <li><a href="#width">width</a><span>, in § 2.2.4</span>
+  </ul>
+  <aside aria-labelledby="infopaneltitle-for-f03adbccd0f71dbd64db6303812028fa" class="dfn-panel" data-for="f03adbccd0f71dbd64db6303812028fa" id="infopanel-for-f03adbccd0f71dbd64db6303812028fa">
+   <span id="infopaneltitle-for-f03adbccd0f71dbd64db6303812028fa" style="display:none">Info about the 'av1 bitstream' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=1">1. Bitstream features overview</a>
+    <li><a href="#ref-for-page=1①">2. Basic Encapsulation Scheme</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-3832a1720800015cee7b0703f7328c35" class="dfn-panel" data-for="3832a1720800015cee7b0703f7328c35" id="infopanel-for-3832a1720800015cee7b0703f7328c35">
+   <span id="infopaneltitle-for-3832a1720800015cee7b0703f7328c35" style="display:none">Info about the 'buffer_removal_time' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-559078660a67169a7db62632f96f0f56" class="dfn-panel" data-for="559078660a67169a7db62632f96f0f56" id="infopanel-for-559078660a67169a7db62632f96f0f56">
+   <span id="infopaneltitle-for-559078660a67169a7db62632f96f0f56" style="display:none">Info about the 'color_config' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=44">2.3.4. Semantics</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-ffd6a013c385ccb5c6974a36f39c9419" class="dfn-panel" data-for="ffd6a013c385ccb5c6974a36f39c9419" id="infopanel-for-ffd6a013c385ccb5c6974a36f39c9419">
+   <span id="infopaneltitle-for-ffd6a013c385ccb5c6974a36f39c9419" style="display:none">Info about the 'delayed random access point' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=206">1. Bitstream features overview</a> <a href="#ref-for-page=206①">(2)</a> <a href="#ref-for-page=206②">(3)</a> <a href="#ref-for-page=206③">(4)</a> <a href="#ref-for-page=206④">(5)</a> <a href="#ref-for-page=206⑤">(6)</a> <a href="#ref-for-page=206⑥">(7)</a>
+    <li><a href="#ref-for-page=206⑦">2.4. AV1 Sample Format</a>
+    <li><a href="#ref-for-page=206⑧">2.5.2. Description</a> <a href="#ref-for-page=206⑨">(2)</a>
+    <li><a href="#ref-for-page=206①⓪">2.5.4. Semantics</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-d58adec65fc7472c4103fc0ce48ffad2" class="dfn-panel" data-for="d58adec65fc7472c4103fc0ce48ffad2" id="infopanel-for-d58adec65fc7472c4103fc0ce48ffad2">
+   <span id="infopaneltitle-for-d58adec65fc7472c4103fc0ce48ffad2" style="display:none">Info about the 'frame header obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=49">2.3.4. Semantics</a>
+    <li><a href="#ref-for-page=49①">2.4. AV1 Sample Format</a>
+    <li><a href="#ref-for-page=49②">4.1. General Subsample Encryption constraints</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-61cc567b8d2c37a5482c59baafb6b8ff" class="dfn-panel" data-for="61cc567b8d2c37a5482c59baafb6b8ff" id="infopanel-for-61cc567b8d2c37a5482c59baafb6b8ff">
+   <span id="infopaneltitle-for-61cc567b8d2c37a5482c59baafb6b8ff" style="display:none">Info about the 'frame obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=71">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=71①">(2)</a> <a href="#ref-for-page=71②">(3)</a> <a href="#ref-for-page=71③">(4)</a> <a href="#ref-for-page=71④">(5)</a> <a href="#ref-for-page=71⑤">(6)</a> <a href="#ref-for-page=71⑥">(7)</a> <a href="#ref-for-page=71⑦">(8)</a> <a href="#ref-for-page=71⑧">(9)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-44bda72a7faed4e3816a653629cc8043" class="dfn-panel" data-for="44bda72a7faed4e3816a653629cc8043" id="infopanel-for-44bda72a7faed4e3816a653629cc8043">
+   <span id="infopaneltitle-for-44bda72a7faed4e3816a653629cc8043" style="display:none">Info about the 'frame_presentation_time' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-8720e7b90737c186d54125451a6578c3" class="dfn-panel" data-for="8720e7b90737c186d54125451a6578c3" id="infopanel-for-8720e7b90737c186d54125451a6578c3">
+   <span id="infopaneltitle-for-8720e7b90737c186d54125451a6578c3" style="display:none">Info about the 'initial_display_delay_minus_1' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-320f0b8648b2c86937bd5df124c0721c" class="dfn-panel" data-for="320f0b8648b2c86937bd5df124c0721c" id="infopanel-for-320f0b8648b2c86937bd5df124c0721c">
+   <span id="infopaneltitle-for-320f0b8648b2c86937bd5df124c0721c" style="display:none">Info about the 'inter frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
+    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
+    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-48602d12010b460d62666543107dbb8c" class="dfn-panel" data-for="48602d12010b460d62666543107dbb8c" id="infopanel-for-48602d12010b460d62666543107dbb8c">
+   <span id="infopaneltitle-for-48602d12010b460d62666543107dbb8c" style="display:none">Info about the 'intra-only frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
+    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
+    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-f8cc04bc4613acfd789110ae277063a3" class="dfn-panel" data-for="f8cc04bc4613acfd789110ae277063a3" id="infopanel-for-f8cc04bc4613acfd789110ae277063a3">
+   <span id="infopaneltitle-for-f8cc04bc4613acfd789110ae277063a3" style="display:none">Info about the 'key frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
+    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
+    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-295ffdcbb0b3062ed4b9d6391d6555f8" class="dfn-panel" data-for="295ffdcbb0b3062ed4b9d6391d6555f8" id="infopanel-for-295ffdcbb0b3062ed4b9d6391d6555f8">
+   <span id="infopaneltitle-for-295ffdcbb0b3062ed4b9d6391d6555f8" style="display:none">Info about the 'key frame dependent recovery point' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=206">1. Bitstream features overview</a> <a href="#ref-for-page=206①">(2)</a> <a href="#ref-for-page=206②">(3)</a> <a href="#ref-for-page=206③">(4)</a> <a href="#ref-for-page=206④">(5)</a> <a href="#ref-for-page=206⑤">(6)</a> <a href="#ref-for-page=206⑥">(7)</a>
+    <li><a href="#ref-for-page=206⑦">2.4. AV1 Sample Format</a>
+    <li><a href="#ref-for-page=206⑧">2.5.2. Description</a> <a href="#ref-for-page=206⑨">(2)</a>
+    <li><a href="#ref-for-page=206①⓪">2.5.4. Semantics</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-effc5260e6921d7355a31efe9e581f5e" class="dfn-panel" data-for="effc5260e6921d7355a31efe9e581f5e" id="infopanel-for-effc5260e6921d7355a31efe9e581f5e">
+   <span id="infopaneltitle-for-effc5260e6921d7355a31efe9e581f5e" style="display:none">Info about the 'low overhead bitstream format' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=39">1. Bitstream features overview</a>
+    <li><a href="#ref-for-page=39①">2.3.4. Semantics</a>
+    <li><a href="#ref-for-page=39②">2.4. AV1 Sample Format</a> <a href="#ref-for-page=39③">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-2f273a655f76900606361284b223527c" class="dfn-panel" data-for="2f273a655f76900606361284b223527c" id="infopanel-for-2f273a655f76900606361284b223527c">
+   <span id="infopaneltitle-for-2f273a655f76900606361284b223527c" style="display:none">Info about the 'max_frame_height_minus_1' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-607e04e0caddfe3e61efb6ea8770130c" class="dfn-panel" data-for="607e04e0caddfe3e61efb6ea8770130c" id="infopanel-for-607e04e0caddfe3e61efb6ea8770130c">
+   <span id="infopaneltitle-for-607e04e0caddfe3e61efb6ea8770130c" style="display:none">Info about the 'max_frame_width_minus_1' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-cd1fdf90baa77d8296625f83349a558c" class="dfn-panel" data-for="cd1fdf90baa77d8296625f83349a558c" id="infopanel-for-cd1fdf90baa77d8296625f83349a558c">
+   <span id="infopaneltitle-for-cd1fdf90baa77d8296625f83349a558c" style="display:none">Info about the 'metadata obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=46">2.3.4. Semantics</a> <a href="#ref-for-page=46①">(2)</a>
+    <li><a href="#ref-for-page=46②">2.4. AV1 Sample Format</a> <a href="#ref-for-page=46③">(2)</a> <a href="#ref-for-page=46④">(3)</a> <a href="#ref-for-page=46⑤">(4)</a>
+    <li><a href="#ref-for-page=46⑥">2.8.2. Description</a> <a href="#ref-for-page=46⑦">(2)</a> <a href="#ref-for-page=46⑧">(3)</a>
+    <li><a href="#ref-for-page=46⑨">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=46①⓪">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-eb0782dfea22c80ac75d63b45a421c45" class="dfn-panel" data-for="eb0782dfea22c80ac75d63b45a421c45" id="infopanel-for-eb0782dfea22c80ac75d63b45a421c45">
+   <span id="infopaneltitle-for-eb0782dfea22c80ac75d63b45a421c45" style="display:none">Info about the 'mono_chrome' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-fad0316db590b5b97f2a78eea1a20567" class="dfn-panel" data-for="fad0316db590b5b97f2a78eea1a20567" id="infopanel-for-fad0316db590b5b97f2a78eea1a20567">
+   <span id="infopaneltitle-for-fad0316db590b5b97f2a78eea1a20567" style="display:none">Info about the 'obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=39">1. Bitstream features overview</a>
+    <li><a href="#ref-for-page=39①">2.3.4. Semantics</a>
+    <li><a href="#ref-for-page=39②">2.4. AV1 Sample Format</a> <a href="#ref-for-page=39③">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-bcf179fe5dc66841b8ee6f4bf7024547" class="dfn-panel" data-for="bcf179fe5dc66841b8ee6f4bf7024547" id="infopanel-for-bcf179fe5dc66841b8ee6f4bf7024547">
+   <span id="infopaneltitle-for-bcf179fe5dc66841b8ee6f4bf7024547" style="display:none">Info about the 'obu header' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=40">2.3.4. Semantics</a>
+    <li><a href="#ref-for-page=40①">4.1. General Subsample Encryption constraints</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-f9c9cd91bc5ff3e8007f3109e4172022" class="dfn-panel" data-for="f9c9cd91bc5ff3e8007f3109e4172022" id="infopanel-for-f9c9cd91bc5ff3e8007f3109e4172022">
+   <span id="infopaneltitle-for-f9c9cd91bc5ff3e8007f3109e4172022" style="display:none">Info about the 'obu_has_size_field' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-ae8c5a5a2224e16c570d1c72ed7f9ca3" class="dfn-panel" data-for="ae8c5a5a2224e16c570d1c72ed7f9ca3" id="infopanel-for-ae8c5a5a2224e16c570d1c72ed7f9ca3">
+   <span id="infopaneltitle-for-ae8c5a5a2224e16c570d1c72ed7f9ca3" style="display:none">Info about the 'obu_size' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-f41c7b6b409e9137c8b46b0e8192eae7" class="dfn-panel" data-for="f41c7b6b409e9137c8b46b0e8192eae7" id="infopanel-for-f41c7b6b409e9137c8b46b0e8192eae7">
+   <span id="infopaneltitle-for-f41c7b6b409e9137c8b46b0e8192eae7" style="display:none">Info about the 'open_bitstream_unit' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-cb42042994dfc555541c6d2a5b7ac21c" class="dfn-panel" data-for="cb42042994dfc555541c6d2a5b7ac21c" id="infopanel-for-cb42042994dfc555541c6d2a5b7ac21c">
+   <span id="infopaneltitle-for-cb42042994dfc555541c6d2a5b7ac21c" style="display:none">Info about the 'padding obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=121">1. Bitstream features overview</a>
+    <li><a href="#ref-for-page=121①">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=121②">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-2a14dd3c3618065abd5e1df01cd526ce" class="dfn-panel" data-for="2a14dd3c3618065abd5e1df01cd526ce" id="infopanel-for-2a14dd3c3618065abd5e1df01cd526ce">
+   <span id="infopaneltitle-for-2a14dd3c3618065abd5e1df01cd526ce" style="display:none">Info about the 'random access point' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=206">1. Bitstream features overview</a> <a href="#ref-for-page=206①">(2)</a> <a href="#ref-for-page=206②">(3)</a> <a href="#ref-for-page=206③">(4)</a> <a href="#ref-for-page=206④">(5)</a> <a href="#ref-for-page=206⑤">(6)</a> <a href="#ref-for-page=206⑥">(7)</a>
+    <li><a href="#ref-for-page=206⑦">2.4. AV1 Sample Format</a>
+    <li><a href="#ref-for-page=206⑧">2.5.2. Description</a> <a href="#ref-for-page=206⑨">(2)</a>
+    <li><a href="#ref-for-page=206①⓪">2.5.4. Semantics</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-49d4b1324b3e6175214f1de9258652c0" class="dfn-panel" data-for="49d4b1324b3e6175214f1de9258652c0" id="infopanel-for-49d4b1324b3e6175214f1de9258652c0">
+   <span id="infopaneltitle-for-49d4b1324b3e6175214f1de9258652c0" style="display:none">Info about the 'redundant frame header obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=121">1. Bitstream features overview</a>
+    <li><a href="#ref-for-page=121①">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=121②">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-6af483fb580bc8cd300825f157ed0f23" class="dfn-panel" data-for="6af483fb580bc8cd300825f157ed0f23" id="infopanel-for-6af483fb580bc8cd300825f157ed0f23">
+   <span id="infopaneltitle-for-6af483fb580bc8cd300825f157ed0f23" style="display:none">Info about the 'seq_level_idx' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-8c994b92162ebe7ad58fd07f5c951f12" class="dfn-panel" data-for="8c994b92162ebe7ad58fd07f5c951f12" id="infopanel-for-8c994b92162ebe7ad58fd07f5c951f12">
+   <span id="infopaneltitle-for-8c994b92162ebe7ad58fd07f5c951f12" style="display:none">Info about the 'seq_tier' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-0eb96964e5fc585c9760f0cc0f7aa6c3" class="dfn-panel" data-for="0eb96964e5fc585c9760f0cc0f7aa6c3" id="infopanel-for-0eb96964e5fc585c9760f0cc0f7aa6c3">
+   <span id="infopaneltitle-for-0eb96964e5fc585c9760f0cc0f7aa6c3" style="display:none">Info about the 'sequence header obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=41">2.2.4. Semantics</a> <a href="#ref-for-page=41①">(2)</a>
+    <li><a href="#ref-for-page=41②">2.3.4. Semantics</a> <a href="#ref-for-page=41③">(2)</a> <a href="#ref-for-page=41④">(3)</a> <a href="#ref-for-page=41⑤">(4)</a> <a href="#ref-for-page=41⑥">(5)</a> <a href="#ref-for-page=41⑦">(6)</a> <a href="#ref-for-page=41⑧">(7)</a> <a href="#ref-for-page=41⑨">(8)</a> <a href="#ref-for-page=41①⓪">(9)</a> <a href="#ref-for-page=41①①">(10)</a> <a href="#ref-for-page=41①②">(11)</a> <a href="#ref-for-page=41①③">(12)</a> <a href="#ref-for-page=41①④">(13)</a> <a href="#ref-for-page=41①⑤">(14)</a> <a href="#ref-for-page=41①⑥">(15)</a> <a href="#ref-for-page=41①⑦">(16)</a> <a href="#ref-for-page=41①⑧">(17)</a> <a href="#ref-for-page=41①⑨">(18)</a> <a href="#ref-for-page=41②⓪">(19)</a> <a href="#ref-for-page=41②①">(20)</a> <a href="#ref-for-page=41②②">(21)</a> <a href="#ref-for-page=41②③">(22)</a> <a href="#ref-for-page=41②④">(23)</a> <a href="#ref-for-page=41②⑤">(24)</a>
+    <li><a href="#ref-for-page=41②⑥">2.4. AV1 Sample Format</a> <a href="#ref-for-page=41②⑦">(2)</a>
+    <li><a href="#ref-for-page=41②⑧">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=41②⑨">5. Codecs Parameter String</a> <a href="#ref-for-page=41③⓪">(2)</a> <a href="#ref-for-page=41③①">(3)</a> <a href="#ref-for-page=41③②">(4)</a> <a href="#ref-for-page=41③③">(5)</a> <a href="#ref-for-page=41③④">(6)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-8ee84de303b43ec62bb21bf9598287a4" class="dfn-panel" data-for="8ee84de303b43ec62bb21bf9598287a4" id="infopanel-for-8ee84de303b43ec62bb21bf9598287a4">
+   <span id="infopaneltitle-for-8ee84de303b43ec62bb21bf9598287a4" style="display:none">Info about the 'show_existing_frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-6ab350adb6a8d151ef893c148883c990" class="dfn-panel" data-for="6ab350adb6a8d151ef893c148883c990" id="infopanel-for-6ab350adb6a8d151ef893c148883c990">
+   <span id="infopaneltitle-for-6ab350adb6a8d151ef893c148883c990" style="display:none">Info about the 'show_frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-006a3bf07dac848d227cff3f097563c8" class="dfn-panel" data-for="006a3bf07dac848d227cff3f097563c8" id="infopanel-for-006a3bf07dac848d227cff3f097563c8">
+   <span id="infopaneltitle-for-006a3bf07dac848d227cff3f097563c8" style="display:none">Info about the 'subsampling_x' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-eb7fc80c7183639b2fdb78f61ce55a11" class="dfn-panel" data-for="eb7fc80c7183639b2fdb78f61ce55a11" id="infopanel-for-eb7fc80c7183639b2fdb78f61ce55a11">
+   <span id="infopaneltitle-for-eb7fc80c7183639b2fdb78f61ce55a11" style="display:none">Info about the 'subsampling_y' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-8a2bfdfe0bd189daf691bcd702fe8795" class="dfn-panel" data-for="8a2bfdfe0bd189daf691bcd702fe8795" id="infopanel-for-8a2bfdfe0bd189daf691bcd702fe8795">
+   <span id="infopaneltitle-for-8a2bfdfe0bd189daf691bcd702fe8795" style="display:none">Info about the 'switch frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
+    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
+    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-e07ec093ac0a6bd7e497becb0e4dedc1" class="dfn-panel" data-for="e07ec093ac0a6bd7e497becb0e4dedc1" id="infopanel-for-e07ec093ac0a6bd7e497becb0e4dedc1">
+   <span id="infopaneltitle-for-e07ec093ac0a6bd7e497becb0e4dedc1" style="display:none">Info about the 'temporal delimiter obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=46">2.3.4. Semantics</a> <a href="#ref-for-page=46①">(2)</a>
+    <li><a href="#ref-for-page=46②">2.4. AV1 Sample Format</a> <a href="#ref-for-page=46③">(2)</a> <a href="#ref-for-page=46④">(3)</a> <a href="#ref-for-page=46⑤">(4)</a>
+    <li><a href="#ref-for-page=46⑥">2.8.2. Description</a> <a href="#ref-for-page=46⑦">(2)</a> <a href="#ref-for-page=46⑧">(3)</a>
+    <li><a href="#ref-for-page=46⑨">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=46①⓪">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-d71db54f0eeaab45d4615cfd2ca2de3d" class="dfn-panel" data-for="d71db54f0eeaab45d4615cfd2ca2de3d" id="infopanel-for-d71db54f0eeaab45d4615cfd2ca2de3d">
+   <span id="infopaneltitle-for-d71db54f0eeaab45d4615cfd2ca2de3d" style="display:none">Info about the 'temporal unit' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
+    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
+    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-d85adcf672535355b6f59f8ae2a7f312" class="dfn-panel" data-for="d85adcf672535355b6f59f8ae2a7f312" id="infopanel-for-d85adcf672535355b6f59f8ae2a7f312">
+   <span id="infopaneltitle-for-d85adcf672535355b6f59f8ae2a7f312" style="display:none">Info about the 'tile group obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=71">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=71①">(2)</a> <a href="#ref-for-page=71②">(3)</a> <a href="#ref-for-page=71③">(4)</a> <a href="#ref-for-page=71④">(5)</a> <a href="#ref-for-page=71⑤">(6)</a> <a href="#ref-for-page=71⑥">(7)</a> <a href="#ref-for-page=71⑦">(8)</a> <a href="#ref-for-page=71⑧">(9)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-f22120bb18bc0c18d65d82eeeca12326" class="dfn-panel" data-for="f22120bb18bc0c18d65d82eeeca12326" id="infopanel-for-f22120bb18bc0c18d65d82eeeca12326">
+   <span id="infopaneltitle-for-f22120bb18bc0c18d65d82eeeca12326" style="display:none">Info about the 'tile list obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=121">1. Bitstream features overview</a>
+    <li><a href="#ref-for-page=121①">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=121②">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-0bf077100eb0b617c5b8accac3f316c4" class="dfn-panel" data-for="0bf077100eb0b617c5b8accac3f316c4" id="infopanel-for-0bf077100eb0b617c5b8accac3f316c4">
+   <span id="infopaneltitle-for-0bf077100eb0b617c5b8accac3f316c4" style="display:none">Info about the 'timing_info' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=45">2.3.4. Semantics</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-b23305d39492fb7d58d912b81e05ff07" class="dfn-panel" data-for="b23305d39492fb7d58d912b81e05ff07" id="infopanel-for-b23305d39492fb7d58d912b81e05ff07">
+   <span id="infopaneltitle-for-b23305d39492fb7d58d912b81e05ff07" style="display:none">Info about the 'timing_info_present_flag' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
+    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
+    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
+    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
+    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
+    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-935be28bb2ef232ad16945b2cdb69c0f" class="dfn-panel" data-for="935be28bb2ef232ad16945b2cdb69c0f" id="infopanel-for-935be28bb2ef232ad16945b2cdb69c0f">
+   <span id="infopaneltitle-for-935be28bb2ef232ad16945b2cdb69c0f" style="display:none">Info about the 'bytesofcleardata' external reference.</span><a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4. Common Encryption</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a>
+    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(5)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(6)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(7)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(8)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(9)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(10)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(11)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(12)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-0823905e938db14fa0ce9f54969cea70" class="dfn-panel" data-for="0823905e938db14fa0ce9f54969cea70" id="infopanel-for-0823905e938db14fa0ce9f54969cea70">
+   <span id="infopaneltitle-for-0823905e938db14fa0ce9f54969cea70" style="display:none">Info about the 'bytesofprotecteddata' external reference.</span><a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4. Common Encryption</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a>
+    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(5)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(6)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(7)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(8)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(9)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(10)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(11)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(12)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-2b285af7abdae2d4aab3a7cbedfdd6ab" class="dfn-panel" data-for="2b285af7abdae2d4aab3a7cbedfdd6ab" id="infopanel-for-2b285af7abdae2d4aab3a7cbedfdd6ab">
+   <span id="infopaneltitle-for-2b285af7abdae2d4aab3a7cbedfdd6ab" style="display:none">Info about the 'cbcs' external reference.</span><a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4. Common Encryption</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a>
+    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(5)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(6)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(7)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(8)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(9)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(10)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(11)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(12)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-742c038dd8361327983a92bd81e21859" class="dfn-panel" data-for="742c038dd8361327983a92bd81e21859" id="infopanel-for-742c038dd8361327983a92bd81e21859">
+   <span id="infopaneltitle-for-742c038dd8361327983a92bd81e21859" style="display:none">Info about the 'cenc' external reference.</span><a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4. Common Encryption</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a>
+    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(5)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(6)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(7)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(8)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(9)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(10)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(11)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(12)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-1568b5183e757fdee5323510bdd1a120" class="dfn-panel" data-for="1568b5183e757fdee5323510bdd1a120" id="infopanel-for-1568b5183e757fdee5323510bdd1a120">
+   <span id="infopaneltitle-for-1568b5183e757fdee5323510bdd1a120" style="display:none">Info about the 'cmaf video track' external reference.</span><a href="https://www.iso.org/standard/71975.html#">https://www.iso.org/standard/71975.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-1568b5183e757fdee5323510bdd1a120">3. CMAF AV1 track format</a> <a href="#ref-for-1568b5183e757fdee5323510bdd1a120">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-76fc7918b57ae33e76892402603c6b72" class="dfn-panel" data-for="76fc7918b57ae33e76892402603c6b72" id="infopanel-for-76fc7918b57ae33e76892402603c6b72">
+   <span id="infopaneltitle-for-76fc7918b57ae33e76892402603c6b72" style="display:none">Info about the 'cmfc' external reference.</span><a href="https://www.iso.org/standard/71975.html#">https://www.iso.org/standard/71975.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-1568b5183e757fdee5323510bdd1a120">3. CMAF AV1 track format</a> <a href="#ref-for-1568b5183e757fdee5323510bdd1a120">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-952f01526c87045a89015e38d1931006" class="dfn-panel" data-for="952f01526c87045a89015e38d1931006" id="infopanel-for-952f01526c87045a89015e38d1931006">
+   <span id="infopaneltitle-for-952f01526c87045a89015e38d1931006" style="display:none">Info about the 'bitr' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-52b8fcc7cef8754159148e684a77d02e" class="dfn-panel" data-for="52b8fcc7cef8754159148e684a77d02e" id="infopanel-for-52b8fcc7cef8754159148e684a77d02e">
+   <span id="infopaneltitle-for-52b8fcc7cef8754159148e684a77d02e" style="display:none">Info about the 'clap' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-15388b1662efccc6c0d26daa21eb8a02" class="dfn-panel" data-for="15388b1662efccc6c0d26daa21eb8a02" id="infopanel-for-15388b1662efccc6c0d26daa21eb8a02">
+   <span id="infopaneltitle-for-15388b1662efccc6c0d26daa21eb8a02" style="display:none">Info about the 'clli' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-6351cd1cc3bfb6561867f56587297705" class="dfn-panel" data-for="6351cd1cc3bfb6561867f56587297705" id="infopanel-for-6351cd1cc3bfb6561867f56587297705">
+   <span id="infopaneltitle-for-6351cd1cc3bfb6561867f56587297705" style="display:none">Info about the 'colr' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-1b1b183a7f9c84aa05248368ea7421ba" class="dfn-panel" data-for="1b1b183a7f9c84aa05248368ea7421ba" id="infopanel-for-1b1b183a7f9c84aa05248368ea7421ba">
+   <span id="infopaneltitle-for-1b1b183a7f9c84aa05248368ea7421ba" style="display:none">Info about the 'ctts' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-295c612b69b22d9306c1004b4766efa2" class="dfn-panel" data-for="295c612b69b22d9306c1004b4766efa2" id="infopanel-for-295c612b69b22d9306c1004b4766efa2">
+   <span id="infopaneltitle-for-295c612b69b22d9306c1004b4766efa2" style="display:none">Info about the 'iso6' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-fcf81bf686786e641e169d84d6f6c84a" class="dfn-panel" data-for="fcf81bf686786e641e169d84d6f6c84a" id="infopanel-for-fcf81bf686786e641e169d84d6f6c84a">
+   <span id="infopaneltitle-for-fcf81bf686786e641e169d84d6f6c84a" style="display:none">Info about the 'mdcv' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-f2de67e75e1151de694a7aedeccb7e6c" class="dfn-panel" data-for="f2de67e75e1151de694a7aedeccb7e6c" id="infopanel-for-f2de67e75e1151de694a7aedeccb7e6c">
+   <span id="infopaneltitle-for-f2de67e75e1151de694a7aedeccb7e6c" style="display:none">Info about the 'nclx' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-d72ed60b4c680fa6477d565e9553dd28" class="dfn-panel" data-for="d72ed60b4c680fa6477d565e9553dd28" id="infopanel-for-d72ed60b4c680fa6477d565e9553dd28">
+   <span id="infopaneltitle-for-d72ed60b4c680fa6477d565e9553dd28" style="display:none">Info about the 'visualsampleentry' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
+    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-df8441526d3bbb5086bd93c1fae005b3" class="dfn-panel" data-for="df8441526d3bbb5086bd93c1fae005b3" id="infopanel-for-df8441526d3bbb5086bd93c1fae005b3">
+   <span id="infopaneltitle-for-df8441526d3bbb5086bd93c1fae005b3" style="display:none">Info about the 'codecs' external reference.</span><a href="https://tools.ietf.org/html/rfc6381#">https://tools.ietf.org/html/rfc6381#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-df8441526d3bbb5086bd93c1fae005b3">5. Codecs Parameter String</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-37f26709df4ef02bccacdfb3c0626342" class="dfn-panel" data-for="37f26709df4ef02bccacdfb3c0626342" id="infopanel-for-37f26709df4ef02bccacdfb3c0626342">
+   <span id="infopaneltitle-for-37f26709df4ef02bccacdfb3c0626342" style="display:none">Info about the 'coll' external reference.</span><a href="https://www.webmproject.org/vp9/mp4/#">https://www.webmproject.org/vp9/mp4/#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-37f26709df4ef02bccacdfb3c0626342">2.3.4. Semantics</a> <a href="#ref-for-37f26709df4ef02bccacdfb3c0626342">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-b459180629a753573e7c799ce3a57f45" class="dfn-panel" data-for="b459180629a753573e7c799ce3a57f45" id="infopanel-for-b459180629a753573e7c799ce3a57f45">
+   <span id="infopaneltitle-for-b459180629a753573e7c799ce3a57f45" style="display:none">Info about the 'smdm' external reference.</span><a href="https://www.webmproject.org/vp9/mp4/#">https://www.webmproject.org/vp9/mp4/#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-37f26709df4ef02bccacdfb3c0626342">2.3.4. Semantics</a> <a href="#ref-for-37f26709df4ef02bccacdfb3c0626342">(2)</a>
+   </ul>
+  </aside>
+  <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span class="content">Terms defined by reference</span><a class="self-link" href="#index-defined-elsewhere"></a></h3>
+  <ul class="index">
+   <li>
+    <a data-link-type="biblio">[AV1]</a> defines the following terms:
+    <ul>
+     <li><span class="dfn-paneled" id="f03adbccd0f71dbd64db6303812028fa">av1 bitstream</span>
+     <li><span class="dfn-paneled" id="3832a1720800015cee7b0703f7328c35">buffer_removal_time</span>
+     <li><span class="dfn-paneled" id="559078660a67169a7db62632f96f0f56">color_config</span>
+     <li><span class="dfn-paneled" id="ffd6a013c385ccb5c6974a36f39c9419">delayed random access point</span>
+     <li><span class="dfn-paneled" id="d58adec65fc7472c4103fc0ce48ffad2">frame header obu</span>
+     <li><span class="dfn-paneled" id="61cc567b8d2c37a5482c59baafb6b8ff">frame obu</span>
+     <li><span class="dfn-paneled" id="44bda72a7faed4e3816a653629cc8043">frame_presentation_time</span>
+     <li><span class="dfn-paneled" id="8720e7b90737c186d54125451a6578c3">initial_display_delay_minus_1</span>
+     <li><span class="dfn-paneled" id="320f0b8648b2c86937bd5df124c0721c">inter frame</span>
+     <li><span class="dfn-paneled" id="48602d12010b460d62666543107dbb8c">intra-only frame</span>
+     <li><span class="dfn-paneled" id="f8cc04bc4613acfd789110ae277063a3">key frame</span>
+     <li><span class="dfn-paneled" id="295ffdcbb0b3062ed4b9d6391d6555f8">key frame dependent recovery point</span>
+     <li><span class="dfn-paneled" id="effc5260e6921d7355a31efe9e581f5e">low overhead bitstream format</span>
+     <li><span class="dfn-paneled" id="2f273a655f76900606361284b223527c">max_frame_height_minus_1</span>
+     <li><span class="dfn-paneled" id="607e04e0caddfe3e61efb6ea8770130c">max_frame_width_minus_1</span>
+     <li><span class="dfn-paneled" id="cd1fdf90baa77d8296625f83349a558c">metadata obu</span>
+     <li><span class="dfn-paneled" id="eb0782dfea22c80ac75d63b45a421c45">mono_chrome</span>
+     <li><span class="dfn-paneled" id="fad0316db590b5b97f2a78eea1a20567">obu</span>
+     <li><span class="dfn-paneled" id="bcf179fe5dc66841b8ee6f4bf7024547">obu header</span>
+     <li><span class="dfn-paneled" id="f9c9cd91bc5ff3e8007f3109e4172022">obu_has_size_field</span>
+     <li><span class="dfn-paneled" id="ae8c5a5a2224e16c570d1c72ed7f9ca3">obu_size</span>
+     <li><span class="dfn-paneled" id="f41c7b6b409e9137c8b46b0e8192eae7">open_bitstream_unit</span>
+     <li><span class="dfn-paneled" id="cb42042994dfc555541c6d2a5b7ac21c">padding obu</span>
+     <li><span class="dfn-paneled" id="2a14dd3c3618065abd5e1df01cd526ce">random access point</span>
+     <li><span class="dfn-paneled" id="49d4b1324b3e6175214f1de9258652c0">redundant frame header obu</span>
+     <li><span class="dfn-paneled" id="6af483fb580bc8cd300825f157ed0f23">seq_level_idx</span>
+     <li><span class="dfn-paneled" id="8c994b92162ebe7ad58fd07f5c951f12">seq_tier</span>
+     <li><span class="dfn-paneled" id="0eb96964e5fc585c9760f0cc0f7aa6c3">sequence header obu</span>
+     <li><span class="dfn-paneled" id="8ee84de303b43ec62bb21bf9598287a4">show_existing_frame</span>
+     <li><span class="dfn-paneled" id="6ab350adb6a8d151ef893c148883c990">show_frame</span>
+     <li><span class="dfn-paneled" id="006a3bf07dac848d227cff3f097563c8">subsampling_x</span>
+     <li><span class="dfn-paneled" id="eb7fc80c7183639b2fdb78f61ce55a11">subsampling_y</span>
+     <li><span class="dfn-paneled" id="8a2bfdfe0bd189daf691bcd702fe8795">switch frame</span>
+     <li><span class="dfn-paneled" id="e07ec093ac0a6bd7e497becb0e4dedc1">temporal delimiter obu</span>
+     <li><span class="dfn-paneled" id="d71db54f0eeaab45d4615cfd2ca2de3d">temporal unit</span>
+     <li><span class="dfn-paneled" id="d85adcf672535355b6f59f8ae2a7f312">tile group obu</span>
+     <li><span class="dfn-paneled" id="f22120bb18bc0c18d65d82eeeca12326">tile list obu</span>
+     <li><span class="dfn-paneled" id="0bf077100eb0b617c5b8accac3f316c4">timing_info</span>
+     <li><span class="dfn-paneled" id="b23305d39492fb7d58d912b81e05ff07">timing_info_present_flag</span>
+    </ul>
+   <li>
+    <a data-link-type="biblio">[CENC]</a> defines the following terms:
+    <ul>
+     <li><span class="dfn-paneled" id="935be28bb2ef232ad16945b2cdb69c0f">bytesofcleardata</span>
+     <li><span class="dfn-paneled" id="0823905e938db14fa0ce9f54969cea70">bytesofprotecteddata</span>
+     <li><span class="dfn-paneled" id="2b285af7abdae2d4aab3a7cbedfdd6ab">cbcs</span>
+     <li><span class="dfn-paneled" id="742c038dd8361327983a92bd81e21859">cenc</span>
+    </ul>
+   <li>
+    <a data-link-type="biblio">[CMAF]</a> defines the following terms:
+    <ul>
+     <li><span class="dfn-paneled" id="1568b5183e757fdee5323510bdd1a120">cmaf video track</span>
+     <li><span class="dfn-paneled" id="76fc7918b57ae33e76892402603c6b72">cmfc</span>
+    </ul>
+   <li>
+    <a data-link-type="biblio">[ISOBMFF]</a> defines the following terms:
+    <ul>
+     <li><span class="dfn-paneled" id="952f01526c87045a89015e38d1931006">bitr</span>
+     <li><span class="dfn-paneled" id="52b8fcc7cef8754159148e684a77d02e">clap</span>
+     <li><span class="dfn-paneled" id="15388b1662efccc6c0d26daa21eb8a02">clli</span>
+     <li><span class="dfn-paneled" id="6351cd1cc3bfb6561867f56587297705">colr</span>
+     <li><span class="dfn-paneled" id="1b1b183a7f9c84aa05248368ea7421ba">ctts</span>
+     <li><span class="dfn-paneled" id="295c612b69b22d9306c1004b4766efa2">iso6</span>
+     <li><span class="dfn-paneled" id="fcf81bf686786e641e169d84d6f6c84a">mdcv</span>
+     <li><span class="dfn-paneled" id="f2de67e75e1151de694a7aedeccb7e6c">nclx</span>
+     <li><span class="dfn-paneled" id="d72ed60b4c680fa6477d565e9553dd28">visualsampleentry</span>
+    </ul>
+   <li>
+    <a data-link-type="biblio">[RFC6381]</a> defines the following terms:
+    <ul>
+     <li><span class="dfn-paneled" id="df8441526d3bbb5086bd93c1fae005b3">codecs</span>
+    </ul>
+   <li>
+    <a data-link-type="biblio">[VP9]</a> defines the following terms:
+    <ul>
+     <li><span class="dfn-paneled" id="37f26709df4ef02bccacdfb3c0626342">coll</span>
+     <li><span class="dfn-paneled" id="b459180629a753573e7c799ce3a57f45">smdm</span>
+    </ul>
+  </ul>
+  <h2 class="no-num no-ref heading settled" id="references"><span class="content">References</span><a class="self-link" href="#references"></a></h2>
+  <h3 class="no-num no-ref heading settled" id="normative"><span class="content">Normative References</span><a class="self-link" href="#normative"></a></h3>
+  <dl>
+   <dt id="biblio-av1">[AV1]
+   <dd><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf"><cite>AV1 Bitstream &amp; Decoding Process Specification</cite></a>. Standard. URL: <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf">https://aomediacodec.github.io/av1-spec/av1-spec.pdf</a>
+   <dt id="biblio-cenc">[CENC]
+   <dd><a href="https://www.iso.org/standard/68042.html"><cite>Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files</cite></a>. Standard. URL: <a href="https://www.iso.org/standard/68042.html">https://www.iso.org/standard/68042.html</a>
+   <dt id="biblio-cmaf">[CMAF]
+   <dd><a href="https://www.iso.org/standard/71975.html"><cite>Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media</cite></a>. Standard. URL: <a href="https://www.iso.org/standard/71975.html">https://www.iso.org/standard/71975.html</a>
+   <dt id="biblio-isobmff">[ISOBMFF]
+   <dd><a href="http://standards.iso.org/ittf/PubliclyAvailableStandards/c068960_ISO_IEC_14496-12_2015.zip"><cite>Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format</cite></a>. December 2015. International Standard. URL: <a href="http://standards.iso.org/ittf/PubliclyAvailableStandards/c068960_ISO_IEC_14496-12_2015.zip">http://standards.iso.org/ittf/PubliclyAvailableStandards/c068960_ISO_IEC_14496-12_2015.zip</a>
+   <dt id="biblio-rfc2119">[RFC2119]
+   <dd>S. Bradner. <a href="https://datatracker.ietf.org/doc/html/rfc2119"><cite>Key words for use in RFCs to Indicate Requirement Levels</cite></a>. March 1997. Best Current Practice. URL: <a href="https://datatracker.ietf.org/doc/html/rfc2119">https://datatracker.ietf.org/doc/html/rfc2119</a>
+   <dt id="biblio-rfc6381">[RFC6381]
+   <dd>R. Gellens; D. Singer; P. Frojdh. <a href="https://www.rfc-editor.org/rfc/rfc6381"><cite>The 'Codecs' and 'Profiles' Parameters for "Bucket" Media Types</cite></a>. August 2011. Proposed Standard. URL: <a href="https://www.rfc-editor.org/rfc/rfc6381">https://www.rfc-editor.org/rfc/rfc6381</a>
+  </dl>
+  <aside aria-labelledby="infopaneltitle-for-av1sampleentry" class="dfn-panel" data-for="av1sampleentry" id="infopanel-for-av1sampleentry">
+   <span id="infopaneltitle-for-av1sampleentry" style="display:none">Info about the 'AV1SampleEntry' definition.</span><b><a href="#av1sampleentry">#av1sampleentry</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-av1sampleentry">2.1. General Requirements &amp; Brands</a>
+    <li><a href="#ref-for-av1sampleentry①">2.2.4. Semantics</a>
+    <li><a href="#ref-for-av1sampleentry②">2.4. AV1 Sample Format</a> <a href="#ref-for-av1sampleentry③">(2)</a>
+    <li><a href="#ref-for-av1sampleentry④">3. CMAF AV1 track format</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-av1codecconfigurationbox" class="dfn-panel" data-for="av1codecconfigurationbox" id="infopanel-for-av1codecconfigurationbox">
+   <span id="infopaneltitle-for-av1codecconfigurationbox" style="display:none">Info about the 'AV1CodecConfigurationBox' definition.</span><b><a href="#av1codecconfigurationbox">#av1codecconfigurationbox</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-av1codecconfigurationbox">2.2.2. Description</a>
+    <li><a href="#ref-for-av1codecconfigurationbox①">2.2.4. Semantics</a> <a href="#ref-for-av1codecconfigurationbox②">(2)</a>
+    <li><a href="#ref-for-av1codecconfigurationbox③">2.3.4. Semantics</a> <a href="#ref-for-av1codecconfigurationbox④">(2)</a> <a href="#ref-for-av1codecconfigurationbox⑤">(3)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-high_bitdepth" class="dfn-panel" data-for="high_bitdepth" id="infopanel-for-high_bitdepth">
+   <span id="infopaneltitle-for-high_bitdepth" style="display:none">Info about the 'high_bitdepth' definition.</span><b><a href="#high_bitdepth">#high_bitdepth</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-high_bitdepth">2.3.4. Semantics</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-twelve_bit" class="dfn-panel" data-for="twelve_bit" id="infopanel-for-twelve_bit">
+   <span id="infopaneltitle-for-twelve_bit" style="display:none">Info about the 'twelve_bit' definition.</span><b><a href="#twelve_bit">#twelve_bit</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-twelve_bit">2.3.4. Semantics</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-chroma_subsampling_x" class="dfn-panel" data-for="chroma_subsampling_x" id="infopanel-for-chroma_subsampling_x">
+   <span id="infopaneltitle-for-chroma_subsampling_x" style="display:none">Info about the 'chroma_subsampling_x' definition.</span><b><a href="#chroma_subsampling_x">#chroma_subsampling_x</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-chroma_subsampling_x">2.3.4. Semantics</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-chroma_subsampling_y" class="dfn-panel" data-for="chroma_subsampling_y" id="infopanel-for-chroma_subsampling_y">
+   <span id="infopaneltitle-for-chroma_subsampling_y" style="display:none">Info about the 'chroma_subsampling_y' definition.</span><b><a href="#chroma_subsampling_y">#chroma_subsampling_y</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-chroma_subsampling_y">2.3.4. Semantics</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-chroma_sample_position" class="dfn-panel" data-for="chroma_sample_position" id="infopanel-for-chroma_sample_position">
+   <span id="infopaneltitle-for-chroma_sample_position" style="display:none">Info about the 'chroma_sample_position' definition.</span><b><a href="#chroma_sample_position">#chroma_sample_position</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-chroma_sample_position">2.3.4. Semantics</a> <a href="#ref-for-chroma_sample_position①">(2)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-initial_presentation_delay_minus_one" class="dfn-panel" data-for="initial_presentation_delay_minus_one" id="infopanel-for-initial_presentation_delay_minus_one">
+   <span id="infopaneltitle-for-initial_presentation_delay_minus_one" style="display:none">Info about the 'initial_presentation_delay_minus_one' definition.</span><b><a href="#initial_presentation_delay_minus_one">#initial_presentation_delay_minus_one</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-initial_presentation_delay_minus_one">2.3.4. Semantics</a> <a href="#ref-for-initial_presentation_delay_minus_one①">(2)</a> <a href="#ref-for-initial_presentation_delay_minus_one②">(3)</a> <a href="#ref-for-initial_presentation_delay_minus_one③">(4)</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-av1-sample" class="dfn-panel" data-for="av1-sample" id="infopanel-for-av1-sample">
+   <span id="infopaneltitle-for-av1-sample" style="display:none">Info about the 'AV1 Sample' definition.</span><b><a href="#av1-sample">#av1-sample</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-av1-sample">2.2.2. Description</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-av1forwardkeyframesamplegroupentry" class="dfn-panel" data-for="av1forwardkeyframesamplegroupentry" id="infopanel-for-av1forwardkeyframesamplegroupentry">
+   <span id="infopaneltitle-for-av1forwardkeyframesamplegroupentry" style="display:none">Info about the 'AV1ForwardKeyFrameSampleGroupEntry' definition.</span><b><a href="#av1forwardkeyframesamplegroupentry">#av1forwardkeyframesamplegroupentry</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-av1forwardkeyframesamplegroupentry">2.3.4. Semantics</a>
+    <li><a href="#ref-for-av1forwardkeyframesamplegroupentry①">2.4. AV1 Sample Format</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-av1multiframesamplegroupentry" class="dfn-panel" data-for="av1multiframesamplegroupentry" id="infopanel-for-av1multiframesamplegroupentry">
+   <span id="infopaneltitle-for-av1multiframesamplegroupentry" style="display:none">Info about the 'AV1MultiFrameSampleGroupEntry' definition.</span><b><a href="#av1multiframesamplegroupentry">#av1multiframesamplegroupentry</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-av1multiframesamplegroupentry">2.4. AV1 Sample Format</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-av1s" class="dfn-panel" data-for="av1s" id="infopanel-for-av1s">
+   <span id="infopaneltitle-for-av1s" style="display:none">Info about the 'av1s' definition.</span><b><a href="#av1s">#av1s</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-av1s">2.4. AV1 Sample Format</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-av1switchframesamplegroupentry" class="dfn-panel" data-for="av1switchframesamplegroupentry" id="infopanel-for-av1switchframesamplegroupentry">
+   <span id="infopaneltitle-for-av1switchframesamplegroupentry" style="display:none">Info about the 'AV1SwitchFrameSampleGroupEntry' definition.</span><b><a href="#av1switchframesamplegroupentry">#av1switchframesamplegroupentry</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-av1switchframesamplegroupentry">2.4. AV1 Sample Format</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-av1metadatasamplegroupentry" class="dfn-panel" data-for="av1metadatasamplegroupentry" id="infopanel-for-av1metadatasamplegroupentry">
+   <span id="infopaneltitle-for-av1metadatasamplegroupentry" style="display:none">Info about the 'AV1MetadataSampleGroupEntry' definition.</span><b><a href="#av1metadatasamplegroupentry">#av1metadatasamplegroupentry</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-av1metadatasamplegroupentry">2.4. AV1 Sample Format</a>
+   </ul>
+  </aside>
+  <aside aria-labelledby="infopaneltitle-for-cmaf-av1-track" class="dfn-panel" data-for="cmaf-av1-track" id="infopanel-for-cmaf-av1-track">
+   <span id="infopaneltitle-for-cmaf-av1-track" style="display:none">Info about the 'CMAF AV1 Track' definition.</span><b><a href="#cmaf-av1-track">#cmaf-av1-track</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="#ref-for-cmaf-av1-track">3. CMAF AV1 track format</a>
+    <li><a href="#ref-for-cmaf-av1-track①">4. Common Encryption</a>
+   </ul>
+  </aside>
+<script>/* script-dfn-panel */
+"use strict";
+{
+    function queryAll(sel) {
+        return [].slice.call(document.querySelectorAll(sel));
+    }
+
+    // Add popup behavior to all dfns to show the corresponding dfn-panel.
+    var dfns = document.querySelectorAll('.dfn-paneled');
+    for (let dfn of dfns) { insertDfnPopupAction(dfn); }
+
+    document.body.addEventListener("click", (e) => {
+        // If not handled already, just hide all dfn panels.
+        hideAllDfnPanels();
+    });
+
+    function hideAllDfnPanels() {
+        // Turn off any currently "on" or "activated" panels.
+        queryAll(".dfn-panel.on, .dfn-panel.activated").forEach(el=>hideDfnPanel(el));
+    }
+
+    function showDfnPanel(dfnPanel, dfn) {
+        hideAllDfnPanels(); // Only display one at this time.
+        dfn.setAttribute("aria-expanded", "true");
+        dfnPanel.classList.add("on");
+        dfnPanel.style.left = "5px";
+        dfnPanel.style.top = "0px";
+        const panelRect = dfnPanel.getBoundingClientRect();
+        const panelWidth = panelRect.right - panelRect.left;
+        if (panelRect.right > document.body.scrollWidth) {
+            // Panel's overflowing the screen.
+            // Just drop it below the dfn and flip it rightward instead.
+            // This still wont' fix things if the screen is *really* wide,
+            // but fixing that's a lot harder without 'anchor()'.
+            dfnPanel.style.top = "1.5em";
+            dfnPanel.style.left = "auto";
+            dfnPanel.style.right = "0px";
+        }
+    }
+
+    function pinDfnPanel(dfnPanel) {
+        // Switch it to "activated" state, which pins it.
+        dfnPanel.classList.add("activated");
+        dfnPanel.style.left = null;
+        dfnPanel.style.top = null;
+    }
+
+    function hideDfnPanel(dfnPanel, dfn) {
+        if(!dfn) {
+            dfn = document.getElementById(dfnPanel.getAttribute("data-for"));
+        }
+        dfn.setAttribute("aria-expanded", "false")
+        dfnPanel.classList.remove("on");
+        dfnPanel.classList.remove("activated");
+    }
+
+    function toggleDfnPanel(dfnPanel, dfn) {
+        if(dfnPanel.classList.contains("on")) {
+            hideDfnPanel(dfnPanel, dfn);
+        } else {
+            showDfnPanel(dfnPanel, dfn);
+        }
+    }
+
+    function insertDfnPopupAction(dfn) {
+        // Find dfn panel
+        const dfnPanel = document.querySelector(`.dfn-panel[data-for='${dfn.id}']`);
+        if (dfnPanel) {
+            const panelWrapper = document.createElement('span');
+            panelWrapper.appendChild(dfnPanel);
+            panelWrapper.style.position = "relative";
+            panelWrapper.style.height = "0px";
+            dfn.insertAdjacentElement("afterend", panelWrapper);
+            dfn.setAttribute('role', 'button');
+            dfn.setAttribute('aria-expanded', 'false')
+            dfn.tabIndex = 0;
+            dfn.classList.add('has-dfn-panel');
+            dfn.addEventListener('click', (event) => {
+                showDfnPanel(dfnPanel, dfn);
+                event.stopPropagation();
+            });
+            dfn.addEventListener('keypress', (event) => {
+                const kc = event.keyCode;
+                // 32->Space, 13->Enter
+                if(kc == 32 || kc == 13) {
+                    toggleDfnPanel(dfnPanel, dfn);
+                    event.stopPropagation();
+                    event.preventDefault();
+                }
+            });
+
+            dfnPanel.addEventListener('click', (event) => {
+                pinDfnPanel(dfnPanel);
+                event.stopPropagation();
+            });
+
+            dfnPanel.addEventListener('keydown', (event) => {
+                if(event.keyCode == 27) { // Escape key
+                    hideDfnPanel(dfnPanel, dfn);
+                    event.stopPropagation();
+                    event.preventDefault();
+                }
+            })
+
+        } else {
+            console.log("Couldn't find .dfn-panel[data-for='" + dfn.id + "']");
+        }
+    }
+}
+</script>
\ No newline at end of file
diff --git a/v120_main.html b/v120_main.html
new file mode 100644
index 0000000..e6c6035
--- /dev/null
+++ b/v120_main.html
@@ -0,0 +1,3368 @@
+<!DOCTYPE html>
+<!-- saved from url=(0043)https://aomediacodec.github.io/av1-isobmff/ -->
+<html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+  
+  <title>AV1 Codec ISO Media File Format Binding</title>
+  <meta content="width=device-width, initial-scale=1, shrink-to-fit=no" name="viewport">
+<style data-fill-with="stylesheet">/******************************************************************************
+ *                   Style sheet for the W3C specifications                   *
+ *
+ * Special classes handled by this style sheet include:
+ *
+ * Indices
+ *   - .toc for the Table of Contents (<ol class="toc">)
+ *     + <span class="secno"> for the section numbers
+ *   - #toc for the Table of Contents (<nav id="toc">)
+ *   - ul.index for Indices (<a href="#ref">term</a><span>, in § N.M</span>)
+ *   - table.index for Index Tables (e.g. for properties or elements)
+ *
+ * Structural Markup
+ *   - table.data for general data tables
+ *     -> use 'scope' attribute, <colgroup>, <thead>, and <tbody> for best results !
+ *     -> use <table class='complex data'> for extra-complex tables
+ *     -> use <td class='long'> for paragraph-length cell content
+ *     -> use <td class='pre'> when manual line breaks/indentation would help readability
+ *   - dl.switch for switch statements
+ *   - ol.algorithm for algorithms (helps to visualize nesting)
+ *   - .figure and .caption (HTML4) and figure and figcaption (HTML5)
+ *     -> .sidefigure for right-floated figures
+ *   - ins/del
+ *     -> ins/del.c### for candidate and proposed changes (amendments)
+ *
+ * Code
+ *   - pre and code
+ *
+ * Special Sections
+ *   - .note       for informative notes             (div, p, span, aside, details)
+ *   - .example    for informative examples          (div, p, pre, span)
+ *   - .issue      for issues                        (div, p, span)
+ *   - .advisement for loud normative statements     (div, p, strong)
+ *   - .annoying-warning for spec obsoletion notices (div, aside, details)
+ *   - .correction for "candidate corrections"       (div, aside, details, section)
+ *   - .addition   for "candidate additions"         (div, aside, details, section)
+ *   - .correction.proposed for "proposed corrections" (div, aside, details, section)
+ *   - .addition.proposed   for "proposed additions"   (div, aside, details, section)
+ *
+ * Definition Boxes
+ *   - pre.def   for WebIDL definitions
+ *   - table.def for tables that define other entities (e.g. CSS properties)
+ *   - dl.def    for definition lists that define other entitles (e.g. HTML elements)
+ *
+ * Numbering
+ *   - .secno for section numbers in .toc and headings (<span class='secno'>3.2</span>)
+ *   - .marker for source-inserted example/figure/issue numbers (<span class='marker'>Issue 4</span>)
+ *   - ::before styled for CSS-generated issue/example/figure numbers:
+ *     -> Documents wishing to use this only need to add
+ *        figcaption::before,
+ *        .caption::before { content: "Figure "  counter(figure) " ";  }
+ *        .example::before { content: "Example " counter(example) " "; }
+ *        .issue::before   { content: "Issue "   counter(issue) " ";   }
+ *
+ * Header Stuff (ignore, just don't conflict with these classes)
+ *   - .head for the header
+ *   - .copyright for the copyright
+ *
+ * Outdated warning for old specs
+ *
+ * Miscellaneous
+ *   - .overlarge for things that should be as wide as possible, even if
+ *     that overflows the body text area. This can be used on an item or
+ *     on its container, depending on the effect desired.
+ *     Note that this styling basically doesn't help at all when printing,
+ *     since A4 paper isn't much wider than the max-width here.
+ *     It's better to design things to fit into a narrower measure if possible.
+ *
+ *   - js-added ToC jump links (see fixup.js)
+ *
+ ******************************************************************************/
+
+/* color variables included separately for reliability */
+
+/******************************************************************************/
+/*                                    Body                                    */
+/******************************************************************************/
+
+	html {
+	}
+
+	body {
+		counter-reset: example figure issue;
+
+		/* Layout */
+		max-width: 50em;			  /* limit line length to 50em for readability   */
+		margin: 0 auto;				/* center text within page                    */
+		padding: 1.6em 1.5em 2em 50px; /* assume 16px font size for downlevel clients */
+		padding: 1.6em 1.5em 2em calc(26px + 1.5em); /* leave space for status flag    */
+
+		/* Typography */
+		line-height: 1.5;
+		font-family: sans-serif;
+		widows: 2;
+		orphans: 2;
+		word-wrap: break-word;
+		overflow-wrap: break-word;
+		hyphens: auto;
+
+		color: black;
+		color: var(--text);
+		background: white top left fixed no-repeat;
+		background: var(--bg) top left fixed no-repeat;
+		background-size: 25px auto;
+	}
+
+
+/******************************************************************************/
+/*                         Front Matter & Navigation                          */
+/******************************************************************************/
+
+/** Header ********************************************************************/
+
+	div.head { margin-bottom: 1em; }
+	div.head hr { border-style: solid; }
+
+	div.head h1 {
+		font-weight: bold;
+		margin: 0 0 .1em;
+		font-size: 220%;
+	}
+
+	div.head h2 { margin-bottom: 1.5em;}
+
+/** W3C Logo ******************************************************************/
+
+	.head .logo {
+		float: right;
+		margin: 0.4rem 0 0.2rem .4rem;
+	}
+
+	.head img[src*="logos/W3C"] {
+		display: block;
+		border: solid #1a5e9a;
+		border: solid var(--logo-bg);
+		border-width: .65rem .7rem .6rem;
+		border-radius: .4rem;
+		background: #1a5e9a;
+		background: var(--logo-bg);
+		color: white;
+		color: var(--logo-text);
+		font-weight: bold;
+	}
+
+	.head a:hover > img[src*="logos/W3C"],
+	.head a:focus > img[src*="logos/W3C"] {
+		opacity: .8;
+	}
+
+	.head a:active > img[src*="logos/W3C"] {
+		background: #c00;
+		background: var(--logo-active-bg);
+		border-color: #c00;
+		border-color: var(--logo-active-bg);
+	}
+
+	/* see also additional rules in Link Styling section */
+
+/** Copyright *****************************************************************/
+
+	p.copyright,
+	p.copyright small { font-size: small; }
+
+/** Back to Top / ToC Toggle **************************************************/
+
+	@media print {
+		#toc-nav {
+			display: none;
+		}
+	}
+	@media not print {
+		#toc-nav {
+			position: fixed;
+			z-index: 3;
+			bottom: 0; left: 0;
+			margin: 0;
+			min-width: 1.33em;
+			border-top-right-radius: 2rem;
+			box-shadow: 0 0 2px;
+			font-size: 1.5em;
+		}
+		#toc-nav > a {
+			display: block;
+			white-space: nowrap;
+
+			height: 1.33em;
+			padding: .1em 0.3em;
+			margin: 0;
+
+			box-shadow: 0 0 2px;
+			border: none;
+			border-top-right-radius: 1.33em;
+
+			color: #707070;
+			color: var(--tocnav-normal-text);
+			background: white;
+			background: var(--tocnav-normal-bg);
+		}
+		#toc-nav > a:hover,
+		#toc-nav > a:focus {
+			color: black;
+			color: var(--tocnav-hover-text);
+			background: #f8f8f8;
+			background: var(--tocnav-hover-bg);
+		}
+		#toc-nav > a:active {
+			color: #c00;
+			color: var(--tocnav-active-text);
+			background: white;
+			background: var(--tocnav-active-bg);
+		}
+
+		#toc-nav > #toc-jump {
+			padding-bottom: 2em;
+			margin-bottom: -1.9em;
+		}
+
+		/* statusbar gets in the way on keyboard focus; remove once browsers fix */
+		#toc-nav > a[href="#toc"]:not(:hover):focus:last-child {
+			padding-bottom: 1.5rem;
+		}
+
+		#toc-nav:not(:hover) > a:not(:focus) > span + span {
+			/* Ideally this uses :focus-within on #toc-nav */
+			display: none;
+		}
+		#toc-nav > a > span + span {
+			padding-right: 0.2em;
+		}
+	}
+
+/** ToC Sidebar ***************************************************************/
+
+	/* Floating sidebar */
+	@media screen {
+		body.toc-sidebar #toc {
+			position: fixed;
+			top: 0; bottom: 0;
+			left: 0;
+			width: 23.5em;
+			max-width: 80%;
+			max-width: calc(100% - 2em - 26px);
+			overflow: auto;
+			padding: 0 1em;
+			padding-left: 42px;
+			padding-left: calc(1em + 26px);
+			color: black;
+			color: var(--tocsidebar-text);
+			background: inherit;
+			background-color: #f7f8f9;
+			background-color: var(--tocsidebar-bg);
+			z-index: 1;
+			box-shadow: -.1em 0 .25em rgba(0,0,0,.1) inset;
+			box-shadow: -.1em 0 .25em var(--tocsidebar-shadow) inset;
+		}
+		body.toc-sidebar #toc h2 {
+			margin-top: .8rem;
+			font-variant: small-caps;
+			font-variant: all-small-caps;
+			text-transform: lowercase;
+			font-weight: bold;
+			color: gray;
+			color: hsla(203,20%,40%,.7);
+			color: var(--tocsidebar-heading-text);
+		}
+		body.toc-sidebar #toc-jump:not(:focus) {
+			width: 0;
+			height: 0;
+			padding: 0;
+			position: absolute;
+			overflow: hidden;
+		}
+	}
+	/* Hide main scroller when only the ToC is visible anyway */
+	@media screen and (max-width: 28em) {
+		body.toc-sidebar {
+			overflow: hidden;
+		}
+	}
+
+	/* Sidebar with its own space */
+	@media screen and (min-width: 78em) {
+		body:not(.toc-inline) #toc {
+			position: fixed;
+			top: 0; bottom: 0;
+			left: 0;
+			width: 23.5em;
+			overflow: auto;
+			padding: 0 1em;
+			padding-left: 42px;
+			padding-left: calc(1em + 26px);
+			color: black;
+			color: var(--tocsidebar-text);
+			background: inherit;
+			background-color: #f7f8f9;
+			background-color: var(--tocsidebar-bg);
+			z-index: 1;
+			box-shadow: -.1em 0 .25em rgba(0,0,0,.1) inset;
+			box-shadow: -.1em 0 .25em var(--tocsidebar-shadow) inset;
+		}
+		body:not(.toc-inline) #toc h2 {
+			margin-top: .8rem;
+			font-variant: small-caps;
+			font-variant: all-small-caps;
+			text-transform: lowercase;
+			font-weight: bold;
+			color: gray;
+			color: hsla(203,20%,40%,.7);
+			color: var(--tocsidebar-heading-text);
+		}
+
+		body:not(.toc-inline) {
+			padding-left: 29em;
+		}
+		/* See also Overflow section at the bottom */
+
+		body:not(.toc-inline) #toc-jump:not(:focus) {
+			width: 0;
+			height: 0;
+			padding: 0;
+			position: absolute;
+			overflow: hidden;
+		}
+	}
+	@media screen and (min-width: 90em) {
+		body:not(.toc-inline) {
+			margin: 0 4em;
+		}
+	}
+
+/******************************************************************************/
+/*                                Sectioning                                  */
+/******************************************************************************/
+
+/** Headings ******************************************************************/
+
+	h1, h2, h3, h4, h5, h6, dt {
+		page-break-after: avoid;
+		page-break-inside: avoid;
+		font: 100% sans-serif;   /* Reset all font styling to clear out UA styles */
+		font-family: inherit;	/* Inherit the font family. */
+		line-height: 1.2;		/* Keep wrapped headings compact */
+		hyphens: manual;		/* Hyphenated headings look weird */
+	}
+
+	h2, h3, h4, h5, h6 {
+		margin-top: 3rem;
+	}
+
+	h1, h2, h3 {
+		color: #005A9C;
+		color: var(--heading-text);
+	}
+
+	h1 { font-size: 170%; }
+	h2 { font-size: 140%; }
+	h3 { font-size: 120%; }
+	h4 { font-weight: bold; }
+	h5 { font-style: italic; }
+	h6 { font-variant: small-caps; }
+	dt { font-weight: bold; }
+
+/** Subheadings ***************************************************************/
+
+	h1 + h2,
+	#profile-and-date {
+		/* #profile-and-date is a subtitle in an H2 under the H1 */
+		margin-top: 0;
+	}
+	h2 + h3,
+	h3 + h4,
+	h4 + h5,
+	h5 + h6 {
+		margin-top: 1.2em; /* = 1 x line-height */
+	}
+
+/** Section divider ***********************************************************/
+
+	:not(.head) > :not(.head) + hr {
+		font-size: 1.5em;
+		text-align: center;
+		margin: 1em auto;
+		height: auto;
+		color: black;
+		color: var(--hr-text);
+		border: transparent solid 0;
+		background: transparent;
+	}
+	:not(.head) > hr::before {
+		content: "\2727\2003\2003\2727\2003\2003\2727";
+	}
+
+/******************************************************************************/
+/*                            Paragraphs and Lists                            */
+/******************************************************************************/
+
+	p {
+		margin: 1em 0;
+	}
+
+	dd > p:first-child,
+	li > p:first-child {
+		margin-top: 0;
+	}
+
+	ul, ol {
+		margin-left: 0;
+		padding-left: 2em;
+	}
+
+	li {
+		margin: 0.25em 0 0.5em;
+		padding: 0;
+	}
+
+	dl dd {
+		margin: 0 0 .5em 2em;
+	}
+
+	.head dd + dd { /* compact for header */
+		margin-top: -.5em;
+	}
+
+	/* Style for algorithms */
+	ol.algorithm ol:not(.algorithm),
+	.algorithm > ol ol:not(.algorithm) {
+	border-left: 0.5em solid #DEF;
+	border-left: 0.5em solid var(--algo-border);
+	}
+
+	/* Put nice boxes around each algorithm. */
+	[data-algorithm]:not(.heading) {
+	 padding: .5em;
+	 border: thin solid #ddd;
+	 border: thin solid var(--algo-border);
+	 border-radius: .5em;
+	 margin: .5em calc(-0.5em - 1px);
+	}
+	[data-algorithm]:not(.heading) > :first-child {
+	 margin-top: 0;
+	}
+	[data-algorithm]:not(.heading) > :last-child {
+	 margin-bottom: 0;
+	}
+
+	/* Style for switch/case <dl>s */
+	dl.switch > dd > ol.only,
+	dl.switch > dd > .only > ol {
+	margin-left: 0;
+	}
+	dl.switch > dd > ol.algorithm,
+	dl.switch > dd > .algorithm > ol {
+	margin-left: -2em;
+	}
+	dl.switch {
+	padding-left: 2em;
+	}
+	dl.switch > dt {
+	text-indent: -1.5em;
+	margin-top: 1em;
+	}
+	dl.switch > dt + dt {
+	margin-top: 0;
+	}
+	dl.switch > dt::before {
+	content: '\21AA';
+	padding: 0 0.5em 0 0;
+	display: inline-block;
+	width: 1em;
+	text-align: right;
+	line-height: 0.5em;
+	}
+
+/** Terminology Markup ********************************************************/
+
+
+/******************************************************************************/
+/*                                 Inline Markup                              */
+/******************************************************************************/
+
+/** Terminology Markup ********************************************************/
+	dfn   { /* Defining instance */
+		font-weight: bolder;
+	}
+	a > i { /* Instance of term */
+		font-style: normal;
+	}
+	dt dfn code, code.idl {
+		font-size: inherit;
+	}
+	dfn var {
+		font-style: normal;
+	}
+
+/** Change Marking ************************************************************/
+
+	del {
+		color: #aa0000;
+		color: var(--del-text);
+		background: transparent;
+		background: var(--del-bg);
+		text-decoration: line-through;
+	}
+	ins {
+		color: #006100;
+		color: var(--ins-text);
+		background: transparent;
+		background: var(--ins-bg);
+		text-decoration: underline;
+	}
+
+	/* for amendments (candidate/proposed changes) */
+
+	.amendment ins, .correction ins, .addition ins,
+	ins[class^=c] {
+		text-decoration-style: dotted;
+	}
+	.amendment del, .correction del, .addition del,
+	del[class^=c] {
+		text-decoration-style: dotted;
+	}
+	.amendment.proposed ins, .correction.proposed ins, .addition.proposed ins,
+	ins[class^=c].proposed {
+		text-decoration-style: double;
+	}
+	.amendment.proposed del, .correction.proposed del, .addition.proposed del,
+	del[class^=c].proposed {
+		text-decoration-style: double;
+	}
+
+/** Miscellaneous improvements to inline formatting ***************************/
+
+	sup {
+		vertical-align: super;
+		font-size: 80%
+	}
+
+/******************************************************************************/
+/*                                    Code                                    */
+/******************************************************************************/
+
+/** General monospace/pre rules ***********************************************/
+
+	pre, code, samp {
+		font-family: Menlo, Consolas, "DejaVu Sans Mono", Monaco, monospace;
+		font-size: .9em;
+		hyphens: none;
+		text-transform: none;
+		text-align: left;
+		text-align: start;
+		font-variant: normal;
+		orphans: 3;
+		widows: 3;
+		page-break-before: avoid;
+	}
+	pre code,
+	code code {
+		font-size: 100%;
+	}
+
+	pre {
+		margin-top: 1em;
+		margin-bottom: 1em;
+		overflow: auto;
+	}
+
+/** Inline Code fragments *****************************************************/
+
+	/* Do something nice. */
+
+/******************************************************************************/
+/*                                    Links                                   */
+/******************************************************************************/
+
+/** General Hyperlinks ********************************************************/
+
+	/* We hyperlink a lot, so make it less intrusive */
+	a[href] {
+		color: #034575;
+		color: var(--a-normal-text);
+		text-decoration: underline #707070;
+		text-decoration: underline var(--a-normal-underline);
+		text-decoration-skip-ink: none;
+	}
+	a:visited {
+		color: #034575;
+		color: var(--a-visited-text);
+		text-decoration-color: #bbb;
+		text-decoration-color: var(--a-visited-underline);
+	}
+
+	/* Indicate interaction with the link */
+	a[href]:focus,
+	a[href]:hover {
+		text-decoration-thickness: 2px;
+	}
+	a[href]:active {
+		color: #c00;
+		color: var(--a-active-text);
+		text-decoration-color: #c00;
+		text-decoration-color: var(--a-active-underline);
+	}
+
+	/* Backout above styling for W3C logo */
+	.head .logo,
+	.head .logo a {
+		border: none;
+		text-decoration: none;
+		background: transparent;
+	}
+
+/******************************************************************************/
+/*                                    Images                                  */
+/******************************************************************************/
+
+	img {
+		border-style: none;
+	}
+
+	img, svg {
+		/* Intentionally not color-scheme aware. */
+		background: white;
+	}
+
+	/* For autogen numbers, add
+	  .caption::before, figcaption::before { content: "Figure " counter(figure) ". "; }
+	*/
+
+	figure, .figure, .sidefigure {
+		page-break-inside: avoid;
+		text-align: center;
+		margin: 2.5em 0;
+	}
+	.figure img,	.sidefigure img,	figure img,
+	.figure object, .sidefigure object, figure object {
+		max-width: 100%;
+		margin: auto;
+		height: auto;
+	}
+	.figure pre, .sidefigure pre, figure pre {
+		text-align: left;
+		display: table;
+		margin: 1em auto;
+	}
+	.figure table, figure table {
+		margin: auto;
+	}
+	@media screen and (min-width: 20em) {
+		.sidefigure {
+			float: right;
+			width: 50%;
+			margin: 0 0 0.5em 0.5em;
+		}
+	}
+	.caption, figcaption, caption {
+		font-style: italic;
+		font-size: 90%;
+	}
+	.caption::before, figcaption::before, figcaption > .marker {
+		font-weight: bold;
+	}
+	.caption, figcaption {
+		counter-increment: figure;
+	}
+
+	/* DL list is indented 2em, but figure inside it is not */
+	dd > .figure, dd > figure { margin-left: -2em; }
+
+/******************************************************************************/
+/*                             Colored Boxes                                  */
+/******************************************************************************/
+
+	.issue, .note, .example, .assertion, .advisement, blockquote,
+	.amendment, .correction, .addition {
+		margin: 1em auto;
+		padding: .5em;
+		border: .5em;
+		border-left-style: solid;
+		page-break-inside: avoid;
+	}
+	span.issue, span.note {
+		padding: .1em .5em .15em;
+		border-right-style: solid;
+	}
+
+	blockquote > :first-child,
+	.note  > p:first-child,
+	.issue > p:first-child,
+	.amendment > p:first-child,
+	.correction > p:first-child,
+	.addition > p:first-child {
+		margin-top: 0;
+	}
+	blockquote > :last-child,
+	.note  > p:last-child,
+	.issue > p:last-child,
+	.amendment > p:last-child,
+	.correction > p:last-child,
+	.addition > p:last-child {
+		margin-bottom: 0;
+	}
+
+
+	.issue::before, .issue > .marker,
+	.example::before, .example > .marker,
+	.note::before, .note > .marker,
+	details.note > summary > .marker,
+	.amendment::before, .amendment > .marker,
+	details.amendment > summary > .marker,
+	.addition::before, .addition > .marker,
+	addition.amendment > summary > .marker,
+	.correction::before, .correction > .marker,
+	correction.amendment > summary > .marker
+	{
+		text-transform: uppercase;
+		padding-right: 1em;
+	}
+
+	.example::before, .example > .marker {
+		display: block;
+		padding-right: 0em;
+	}
+
+/** Blockquotes ***************************************************************/
+
+	blockquote {
+		border-color: silver;
+		border-color: var(--blockquote-border);
+		background: transparent;
+		background: var(--blockquote-bg);
+		color: currentcolor;
+		color: var(--blockquote-text);
+	}
+
+/** Open issue ****************************************************************/
+
+	.issue {
+		border-color: #e05252;
+		border-color: var(--issue-border);
+		background: #fbe9e9;
+		background: var(--issue-bg);
+		color: black;
+		color: var(--issue-text);
+		counter-increment: issue;
+		overflow: auto;
+	}
+	.issue::before, .issue > .marker {
+		color: #831616;
+		color: var(--issueheading-text);
+	}
+	/* Add .issue::before { content: "Issue " counter(issue) " "; } for autogen numbers,
+	  or use class="marker" to mark up the issue number in source. */
+
+/** Example *******************************************************************/
+
+	.example {
+		border-color: #e0cb52;
+		border-color: var(--example-border);
+		background: #fcfaee;
+		background: var(--example-bg);
+		color: black;
+		color: var(--example-text);
+		counter-increment: example;
+		overflow: auto;
+		clear: both;
+	}
+	.example::before, .example > .marker {
+		color: #574b0f;
+		color: var(--exampleheading-text);
+	}
+	/* Add .example::before { content: "Example " counter(example) " "; } for autogen numbers,
+	  or use class="marker" to mark up the example number in source. */
+
+/** Non-normative Note ********************************************************/
+
+	.note {
+		border-color: #52e052;
+		border-color: var(--note-border);
+		background: #e9fbe9;
+		background: var(--note-bg);
+		color: black;
+		color: var(--note-text);
+		overflow: auto;
+	}
+
+	.note::before, .note > .marker,
+	details.note > summary {
+		color: hsl(120, 70%, 30%);
+		color: var(--noteheading-text);
+	}
+	/* Add .note::before { content: "Note "; } for autogen label,
+	  or use class="marker" to mark up the label in source. */
+
+	details.note[open] > summary {
+		border-bottom: 1px silver solid;
+		border-bottom: 1px var(--notesummary-underline) solid;
+	}
+
+/** Assertion Box *************************************************************/
+	/*  for assertions in algorithms */
+
+	.assertion {
+		border-color: #AAA;
+		border-color: var(--assertion-border);
+		background: #EEE;
+		background: var(--assertion-bg);
+		color: black;
+		color: var(--assertion-text);
+	}
+
+/** Advisement Box ************************************************************/
+	/*  for attention-grabbing normative statements */
+
+	.advisement {
+		border-color: orange;
+		border-color: var(--advisement-border);
+		border-style: none solid;
+		background: #fec;
+		background: var(--advisement-bg);
+		color: black;
+		color: var(--advisement-text);
+	}
+	strong.advisement {
+		display: block;
+		text-align: center;
+	}
+	.advisement::before, .advisement > .marker {
+		color: #b35f00;
+		color: var(--advisementheading-text);
+	}
+
+/** Amendment Box *************************************************************/
+
+	.amendment, .correction, .addition {
+		border-color: #330099;
+		border-color: var(--amendment-border);
+		background: #F5F0FF;
+		background: var(--amendment-bg);
+		color: black;
+		color: var(--amendment-text);
+	}
+	.amendment.proposed, .correction.proposed, .addition.proposed {
+		border-style: solid;
+		border-block-width: 0.25em;
+	}
+	.amendment::before, .amendment > .marker,
+	details.amendment > summary::before, details.amendment > summary > .marker,
+	.correction::before, .correction > .marker,
+	details.correction > summary::before, details.correction > summary > .marker,
+	.addition::before, .addition > .marker,
+	details.addition > summary::before, details.addition > summary > .marker {
+		color: #220066;
+		color: var(--amendmentheading-text);
+	}
+	.amendment.proposed::before, .amendment.proposed > .marker,
+	details.amendment.proposed > summary::before, details.amendment.proposed > summary > .marker,
+	.correction.proposed::before, .correction.proposed > .marker,
+	details.correction.proposed > summary::before, details.correction.proposed > summary > .marker,
+	.addition.proposed::before, .addition.proposed > .marker,
+	details.addition.proposed > summary::before, details.addition.proposed > summary > .marker {
+		font-weight: bold;
+	}
+
+/** Spec Obsoletion Notice ****************************************************/
+	/* obnoxious obsoletion notice for older/abandoned specs. */
+
+	details {
+		display: block;
+	}
+	summary {
+		font-weight: bolder;
+	}
+
+	.annoying-warning:not(details),
+	details.annoying-warning:not([open]) > summary,
+	details.annoying-warning[open] {
+		background: hsla(40,100%,50%,0.95);
+		background: var(--warning-bg);
+		color: black;
+		color: var(--warning-text);
+		padding: .75em 1em;
+		border: red;
+		border: var(--warning-border);
+		border-style: solid none;
+		box-shadow: 0 2px 8px black;
+		text-align: center;
+	}
+	.annoying-warning :last-child {
+		margin-bottom: 0;
+	}
+
+@media not print {
+	details.annoying-warning[open] {
+		position: fixed;
+		left: 0;
+		right: 0;
+		bottom: 2em;
+		z-index: 1000;
+	}
+}
+
+	details.annoying-warning:not([open]) > summary {
+		text-align: center;
+	}
+
+/** Entity Definition Boxes ***************************************************/
+
+	.def {
+		padding: .5em 1em;
+		background: #def;
+		background: var(--def-bg);
+		margin: 1.2em 0;
+		border-left: 0.5em solid #8ccbf2;
+		border-left: 0.5em solid var(--def-border);
+		color: black;
+		color: var(--def-text);
+	}
+
+/******************************************************************************/
+/*                                    Tables                                  */
+/******************************************************************************/
+
+	th, td {
+		text-align: left;
+		text-align: start;
+	}
+
+/** Property/Descriptor Definition Tables *************************************/
+
+	table.def {
+		/* inherits .def box styling, see above */
+		width: 100%;
+		border-spacing: 0;
+	}
+
+	table.def td,
+	table.def th {
+		padding: 0.5em;
+		vertical-align: baseline;
+		border-bottom: 1px solid #bbd7e9;
+		border-bottom: 1px solid var(--defrow-border);
+	}
+
+	table.def > tbody > tr:last-child th,
+	table.def > tbody > tr:last-child td {
+		border-bottom: 0;
+	}
+
+	table.def th {
+		font-style: italic;
+		font-weight: normal;
+		padding-left: 1em;
+		width: 3em;
+	}
+
+	/* For when values are extra-complex and need formatting for readability */
+	table td.pre {
+		white-space: pre-wrap;
+	}
+
+	/* A footnote at the bottom of a def table */
+	table.def td.footnote {
+		padding-top: 0.6em;
+	}
+	table.def td.footnote::before {
+		content: " ";
+		display: block;
+		height: 0.6em;
+		width: 4em;
+		border-top: thin solid;
+	}
+
+/** Data tables (and properly marked-up index tables) *************************/
+	/*
+		<table class="data"> highlights structural relationships in a table
+		when correct markup is used (e.g. thead/tbody, th vs. td, scope attribute)
+
+		Use class="complex data" for particularly complicated tables --
+		(This will draw more lines: busier, but clearer.)
+
+		Use class="long" on table cells with paragraph-like contents
+		(This will adjust text alignment accordingly.)
+		Alternately use class="longlastcol" on tables, to have the last column assume "long".
+	*/
+
+	table {
+		word-wrap: normal;
+		overflow-wrap: normal;
+		hyphens: manual;
+	}
+
+	table.data,
+	table.index {
+		margin: 1em auto;
+		border-collapse: collapse;
+		border: hidden;
+		width: 100%;
+	}
+	table.data caption,
+	table.index caption {
+		max-width: 50em;
+		margin: 0 auto 1em;
+	}
+
+	table.data td,  table.data th,
+	table.index td, table.index th {
+		padding: 0.5em 1em;
+		border-width: 1px;
+		border-color: silver;
+		border-color: var(--datacell-border);
+		border-top-style: solid;
+	}
+
+	table.data thead td:empty {
+		padding: 0;
+		border: 0;
+	}
+
+	table.data  thead,
+	table.index thead,
+	table.data  tbody,
+	table.index tbody {
+		border-bottom: 2px solid;
+	}
+
+	table.data colgroup,
+	table.index colgroup {
+		border-left: 2px solid;
+	}
+
+	table.data  tbody th:first-child,
+	table.index tbody th:first-child  {
+		border-right: 2px solid;
+		border-top: 1px solid silver;
+		border-top: 1px solid var(--datacell-border);
+		padding-right: 1em;
+	}
+
+	table.data th[colspan],
+	table.data td[colspan] {
+		text-align: center;
+	}
+
+	table.complex.data th,
+	table.complex.data td {
+		border: 1px solid silver;
+		border: 1px solid var(--datacell-border);
+		text-align: center;
+	}
+
+	table.data.longlastcol td:last-child,
+	table.data td.long {
+		vertical-align: baseline;
+		text-align: left;
+	}
+
+	table.data img {
+		vertical-align: middle;
+	}
+
+
+/*
+Alternate table alignment rules
+
+	table.data,
+	table.index {
+		text-align: center;
+	}
+
+	table.data  thead th[scope="row"],
+	table.index thead th[scope="row"] {
+		text-align: right;
+	}
+
+	table.data  tbody th:first-child,
+	table.index tbody th:first-child  {
+		text-align: right;
+	}
+
+Possible extra rowspan handling
+
+	table.data  tbody th[rowspan]:not([rowspan='1']),
+	table.index tbody th[rowspan]:not([rowspan='1']),
+	table.data  tbody td[rowspan]:not([rowspan='1']),
+	table.index tbody td[rowspan]:not([rowspan='1']) {
+		border-left: 1px solid silver;
+	}
+
+	table.data  tbody th[rowspan]:first-child,
+	table.index tbody th[rowspan]:first-child,
+	table.data  tbody td[rowspan]:first-child,
+	table.index tbody td[rowspan]:first-child{
+		border-left: 0;
+		border-right: 1px solid silver;
+	}
+*/
+
+/******************************************************************************/
+/*                                  Indices                                   */
+/******************************************************************************/
+
+
+/** Table of Contents *********************************************************/
+
+	.toc a {
+		/* More spacing; use padding to make it part of the click target. */
+		padding: 0.1rem 1px 0;
+		/* Larger, more consistently-sized click target */
+		display: block;
+		/* Switch to using border-bottom for underlines */
+		text-decoration: none;
+		border-bottom: 1px solid;
+		/* Reverse color scheme */
+		color: black;
+		color: var(--toclink-text);
+		border-color: #3980b5;
+		border-color: var(--toclink-underline);
+	}
+	.toc a:visited {
+		color: black;
+		color: var(--toclink-visited-text);
+		border-color: #054572;
+		border-color: var(--toclink-visited-underline);
+	}
+	.toc a:focus,
+	.toc a:hover {
+		background: rgba(75%, 75%, 75%, .25);
+		background: var(--a-hover-bg);
+		border-bottom-width: 3px;
+		margin-bottom: -2px;
+	}
+	.toc a:not(:focus):not(:hover) {
+		/* Allow colors to cascade through from link styling */
+		border-bottom-color: transparent;
+	}
+
+	.toc, .toc ol, .toc ul, .toc li {
+		list-style: none; /* Numbers must be inlined into source */
+		/* because generated content isn't search/selectable and markers can't do multilevel yet */
+		margin:  0;
+		padding: 0;
+	}
+	.toc {
+		line-height: 1.1em;
+	}
+
+	/* ToC not indented until third level, but font style & margins show hierarchy */
+	.toc > li			{ font-weight: bold;   }
+	.toc > li li		 { font-weight: normal; }
+	.toc > li li li	  { font-size:   95%;	}
+	.toc > li li li li	{ font-size:   90%;	}
+	.toc > li li li li li { font-size:   85%;	}
+
+	/* @supports not (display:grid) { */
+		.toc > li			{ margin: 1.5rem 0;	}
+		.toc > li li		 { margin: 0.3rem 0;	}
+		.toc > li li li	  { margin-left: 2rem;   }
+
+		/* Section numbers in a column of their own */
+		.toc .secno {
+			float: left;
+			width: 4rem;
+			white-space: nowrap;
+		}
+		.toc > li li li li .secno { font-size: 85%; }
+		.toc > li li li li li .secno { font-size: 100%; }
+
+		.toc li {
+			clear: both;
+		}
+
+		:not(li) > .toc			 { margin-left:  5rem; }
+		.toc .secno				 { margin-left: -5rem; }
+		.toc > li li li .secno	  { margin-left: -7rem; }
+		.toc > li li li li .secno	{ margin-left: -9rem; }
+		.toc > li li li li li .secno { margin-left: -11rem; }
+
+		/* Tighten up indentation in narrow ToCs */
+		@media (max-width: 30em) {
+			:not(li) > .toc			 { margin-left:  4rem; }
+			.toc .secno				 { margin-left: -4rem; }
+			.toc > li li li			 { margin-left:  1rem; }
+			.toc > li li li .secno	  { margin-left: -5rem; }
+			.toc > li li li li .secno	{ margin-left: -6rem; }
+			.toc > li li li li li .secno { margin-left: -7rem; }
+		}
+		/* Loosen it on wide screens */
+		@media screen and (min-width: 78em) {
+			body:not(.toc-inline) :not(li) > .toc			 { margin-left:  4rem; }
+			body:not(.toc-inline) .toc .secno				 { margin-left: -4rem; }
+			body:not(.toc-inline) .toc > li li li			 { margin-left:  1rem; }
+			body:not(.toc-inline) .toc > li li li .secno	  { margin-left: -5rem; }
+			body:not(.toc-inline) .toc > li li li li .secno	{ margin-left: -6rem; }
+			body:not(.toc-inline) .toc > li li li li li .secno { margin-left: -7rem; }
+	}
+	/* } */
+
+	@supports (display:grid) and (display:contents) {
+		/* Use #toc over .toc to override non-@supports rules. */
+		#toc {
+			display: grid;
+			align-content: start;
+			grid-template-columns: auto 1fr;
+			grid-column-gap: 1rem;
+			column-gap: 1rem;
+			grid-row-gap: .6rem;
+			row-gap: .6rem;
+		}
+		#toc h2 {
+			grid-column: 1 / -1;
+			margin-bottom: 0;
+		}
+		#toc ol,
+		#toc li,
+		#toc a {
+			display: contents;
+			/* Switch <a> to subgrid when supported */
+		}
+		#toc span {
+			margin: 0;
+		}
+		#toc > .toc > li > a > span {
+			/* The spans of the top-level list,
+			  comprising the first items of each top-level section. */
+			margin-top: 1.1rem;
+		}
+		#toc#toc .secno { /* Ugh, need more specificity to override base.css */
+			grid-column: 1;
+			width: auto;
+			margin-left: 0;
+		}
+		#toc .content {
+			grid-column: 2;
+			width: auto;
+			margin-right: 1rem;
+		}
+		#toc .content:hover,
+		#toc .content:focus {
+			background: rgba(75%, 75%, 75%, .25);
+			background: var(--a-hover-bg);
+			border-bottom: 3px solid #054572;
+			border-bottom: 3px solid var(--toclink-underline);
+			margin-bottom: -3px;
+		}
+		#toc li li li .content {
+			margin-left: 1rem;
+		}
+		#toc li li li li .content {
+			margin-left: 2rem;
+		}
+	}
+
+
+/** Index *********************************************************************/
+
+	/* Index Lists: Layout */
+	ul.index	  { margin-left: 0; columns: 15em; text-indent: 1em hanging; }
+	ul.index li	{ margin-left: 0; list-style: none; break-inside: avoid; }
+	ul.index li li { margin-left: 1em; }
+	ul.index dl	{ margin-top: 0; }
+	ul.index dt	{ margin: .2em 0 .2em 20px;}
+	ul.index dd	{ margin: .2em 0 .2em 40px;}
+	/* Index Lists: Typography */
+	ul.index ul,
+	ul.index dl { font-size: smaller; }
+	@media not print {
+		ul.index li span:not(.dfn-paneled) {
+			white-space: nowrap;
+			color: transparent; }
+		ul.index li a:hover + span,
+		ul.index li a:focus + span {
+			color: #707070;
+			color: var(--indexinfo-text);
+		}
+	}
+
+/** Index Tables *****************************************************/
+	/* See also the data table styling section, which this effectively subclasses */
+
+	table.index {
+		font-size: small;
+		border-collapse: collapse;
+		border-spacing: 0;
+		text-align: left;
+		margin: 1em 0;
+	}
+
+	table.index td,
+	table.index th {
+		padding: 0.4em;
+	}
+
+	table.index tr:hover td:not([rowspan]),
+	table.index tr:hover th:not([rowspan]) {
+		color: black;
+		color: var(--indextable-hover-text);
+		background: #f7f8f9;
+		background: var(--indextable-hover-bg);
+	}
+
+	/* The link in the first column in the property table (formerly a TD) */
+	table.index th:first-child a {
+		font-weight: bold;
+	}
+
+/** Outdated warning **********************************************************/
+
+.outdated-spec {
+	color: black;
+	color: var(--outdatedspec-text);
+	background-color: rgba(0,0,0,0.5);
+	background-color: var(--outdatedspec-bg);
+}
+
+.outdated-warning {
+	position: fixed;
+	bottom: 50%;
+	left: 0;
+	right: 0;
+	margin: 0 auto;
+	width: 50%;
+	background: maroon;
+	background: var(--outdated-bg);
+	color: white;
+	color: var(--outdated-text);
+	border-radius: 1em;
+	box-shadow: 0 0 1em red;
+	box-shadow: 0 0 1em var(--outdated-shadow);
+	padding: 2em;
+	text-align: center;
+	z-index: 2;
+}
+
+.outdated-warning a {
+	color: currentcolor;
+	background: transparent;
+}
+
+.edited-rec-warning {
+	background: darkorange;
+	background: var(--editedrec-bg);
+	box-shadow: 0 0 1em;
+}
+
+.outdated-warning button {
+	color: var(--outdated-text);
+	border-radius: 1em;
+	box-shadow: 0 0 1em red;
+	box-shadow: 0 0 1em var(--outdated-shadow);
+	padding: 2em;
+	text-align: center;
+	z-index: 2;
+}
+
+.outdated-warning a {
+	color: currentcolor;
+	background: transparent;
+}
+
+.edited-rec-warning {
+	background: darkorange;
+	background: var(--editedrec-bg);
+	box-shadow: 0 0 1em;
+}
+
+.outdated-warning button {
+	position: absolute;
+	top: 0;
+	right:0;
+	margin: 0;
+	border: 0;
+	padding: 0.25em 0.5em;
+	background: transparent;
+	color: white;
+	color: var(--outdated-text);
+	font:1em sans-serif;
+	text-align:center;
+}
+
+.outdated-warning span {
+	display: block;
+}
+
+.outdated-collapsed {
+	bottom: 0;
+	border-radius: 0;
+	width: 100%;
+	padding: 0;
+}
+
+/******************************************************************************/
+/*                                    Print                                   */
+/******************************************************************************/
+
+	@media print {
+		/* Pages have their own margins. */
+		html {
+			margin: 0;
+		}
+		/* Serif for print. */
+		body {
+			font-family: serif;
+		}
+
+		.outdated-warning {
+			position: absolute;
+			border-style: solid;
+			border-color: red;
+		}
+
+		.outdated-warning input {
+			display: none;
+		}
+	}
+	@page {
+		margin: 1.5cm 1.1cm;
+	}
+
+
+
+/******************************************************************************/
+/*                             Overflow Control                               */
+/******************************************************************************/
+
+	.figure .caption, .sidefigure .caption, figcaption {
+		/* in case figure is overlarge, limit caption to 50em */
+		max-width: 50rem;
+		margin-left: auto;
+		margin-right: auto;
+	}
+	.overlarge {
+		/* Magic to create good item positioning:
+		  "content column" is 50ems wide at max; less on smaller screens.
+		  Extra space (after ToC + content) is empty on the right.
+
+		  1. When item < content column, centers item in column.
+		  2. When content < item < available, left-aligns.
+		  3. When item > available, fills available + scroll bar.
+		*/
+		display: grid;
+		grid-template-columns: minmax(0, 50em);
+	}
+	.overlarge > table {
+		/* limit preferred width of table */
+		max-width: 50em;
+		margin-left: auto;
+		margin-right: auto;
+	}
+
+	@media (min-width: 55em) {
+		.overlarge {
+			margin-right: calc(13px + 26.5rem - 50vw);
+			max-width: none;
+		}
+	}
+	@media screen and (min-width: 78em) {
+		body:not(.toc-inline) .overlarge {
+			/* 30.5em body padding 50em content area */
+			margin-right: calc(40em - 50vw) !important;
+		}
+	}
+	@media screen and (min-width: 90em) {
+		body:not(.toc-inline) .overlarge {
+			/* 4em html margin 30.5em body padding 50em content area */
+			margin-right: calc(84.5em - 100vw) !important;
+		}
+	}
+
+	@media not print {
+		.overlarge {
+			overflow-x: auto;
+			/* See Lea Verou's explanation background-attachment:
+			* http://lea.verou.me/2012/04/background-attachment-local/
+			*
+			background: top left  / 4em 100% linear-gradient(to right,  #ffffff, rgba(255, 255, 255, 0)) local,
+						top right / 4em 100% linear-gradient(to left, #ffffff, rgba(255, 255, 255, 0)) local,
+						top left  / 1em 100% linear-gradient(to right,  #c3c3c5, rgba(195, 195, 197, 0)) scroll,
+						top right / 1em 100% linear-gradient(to left, #c3c3c5, rgba(195, 195, 197, 0)) scroll,
+						white;
+			background-repeat: no-repeat;
+			*/
+		}
+	}
+</style>
+  <meta content="Bikeshed version dfbc2b297, updated Thu Nov 11 15:52:32 2021 -0800" name="generator">
+  <link href="https://aomediacodec.github.io/av1-isobmff/" rel="canonical">
+  <meta content="91ae751e7ef9d7969041c7ba2966160c99a5e16f" name="document-revision">
+<style>/* style-autolinks */
+
+.css.css, .property.property, .descriptor.descriptor {
+    color: var(--a-normal-text);
+    font-size: inherit;
+    font-family: inherit;
+}
+.css::before, .property::before, .descriptor::before {
+    content: "‘";
+}
+.css::after, .property::after, .descriptor::after {
+    content: "’";
+}
+.property, .descriptor {
+    /* Don't wrap property and descriptor names */
+    white-space: nowrap;
+}
+.type { /* CSS value <type> */
+    font-style: italic;
+}
+pre .property::before, pre .property::after {
+    content: "";
+}
+[data-link-type="property"]::before,
+[data-link-type="propdesc"]::before,
+[data-link-type="descriptor"]::before,
+[data-link-type="value"]::before,
+[data-link-type="function"]::before,
+[data-link-type="at-rule"]::before,
+[data-link-type="selector"]::before,
+[data-link-type="maybe"]::before {
+    content: "‘";
+}
+[data-link-type="property"]::after,
+[data-link-type="propdesc"]::after,
+[data-link-type="descriptor"]::after,
+[data-link-type="value"]::after,
+[data-link-type="function"]::after,
+[data-link-type="at-rule"]::after,
+[data-link-type="selector"]::after,
+[data-link-type="maybe"]::after {
+    content: "’";
+}
+
+[data-link-type].production::before,
+[data-link-type].production::after,
+.prod [data-link-type]::before,
+.prod [data-link-type]::after {
+    content: "";
+}
+
+[data-link-type=element],
+[data-link-type=element-attr] {
+    font-family: Menlo, Consolas, "DejaVu Sans Mono", monospace;
+    font-size: .9em;
+}
+[data-link-type=element]::before { content: "<" }
+[data-link-type=element]::after  { content: ">" }
+
+[data-link-type=biblio] {
+    white-space: pre;
+}</style>
+<style>/* style-colors */
+
+/* Any --*-text not paired with a --*-bg is assumed to have a transparent bg */
+:root {
+    color-scheme: light dark;
+
+    --text: black;
+    --bg: white;
+
+    --unofficial-watermark: url(https://www.w3.org/StyleSheets/TR/2016/logos/UD-watermark);
+
+    --logo-bg: #1a5e9a;
+    --logo-active-bg: #c00;
+    --logo-text: white;
+
+    --tocnav-normal-text: #707070;
+    --tocnav-normal-bg: var(--bg);
+    --tocnav-hover-text: var(--tocnav-normal-text);
+    --tocnav-hover-bg: #f8f8f8;
+    --tocnav-active-text: #c00;
+    --tocnav-active-bg: var(--tocnav-normal-bg);
+
+    --tocsidebar-text: var(--text);
+    --tocsidebar-bg: #f7f8f9;
+    --tocsidebar-shadow: rgba(0,0,0,.1);
+    --tocsidebar-heading-text: hsla(203,20%,40%,.7);
+
+    --toclink-text: var(--text);
+    --toclink-underline: #3980b5;
+    --toclink-visited-text: var(--toclink-text);
+    --toclink-visited-underline: #054572;
+
+    --heading-text: #005a9c;
+
+    --hr-text: var(--text);
+
+    --algo-border: #def;
+
+    --del-text: red;
+    --del-bg: transparent;
+    --ins-text: #080;
+    --ins-bg: transparent;
+
+    --a-normal-text: #034575;
+    --a-normal-underline: #bbb;
+    --a-visited-text: var(--a-normal-text);
+    --a-visited-underline: #707070;
+    --a-hover-bg: rgba(75%, 75%, 75%, .25);
+    --a-active-text: #c00;
+    --a-active-underline: #c00;
+
+    --blockquote-border: silver;
+    --blockquote-bg: transparent;
+    --blockquote-text: currentcolor;
+
+    --issue-border: #e05252;
+    --issue-bg: #fbe9e9;
+    --issue-text: var(--text);
+    --issueheading-text: #831616;
+
+    --example-border: #e0cb52;
+    --example-bg: #fcfaee;
+    --example-text: var(--text);
+    --exampleheading-text: #574b0f;
+
+    --note-border: #52e052;
+    --note-bg: #e9fbe9;
+    --note-text: var(--text);
+    --noteheading-text: hsl(120, 70%, 30%);
+    --notesummary-underline: silver;
+
+    --assertion-border: #aaa;
+    --assertion-bg: #eee;
+    --assertion-text: black;
+
+    --advisement-border: orange;
+    --advisement-bg: #fec;
+    --advisement-text: var(--text);
+    --advisementheading-text: #b35f00;
+
+    --warning-border: red;
+    --warning-bg: hsla(40,100%,50%,0.95);
+    --warning-text: var(--text);
+
+    --amendment-border: #330099;
+    --amendment-bg: #F5F0FF;
+    --amendment-text: var(--text);
+    --amendmentheading-text: #220066;
+
+    --def-border: #8ccbf2;
+    --def-bg: #def;
+    --def-text: var(--text);
+    --defrow-border: #bbd7e9;
+
+    --datacell-border: silver;
+
+    --indexinfo-text: #707070;
+
+    --indextable-hover-text: black;
+    --indextable-hover-bg: #f7f8f9;
+
+    --outdatedspec-bg: rgba(0, 0, 0, .5);
+    --outdatedspec-text: black;
+    --outdated-bg: maroon;
+    --outdated-text: white;
+    --outdated-shadow: red;
+
+    --editedrec-bg: darkorange;
+}</style>
+<style>/* style-counters */
+
+body {
+    counter-reset: example figure issue;
+}
+.issue {
+    counter-increment: issue;
+}
+.issue:not(.no-marker)::before {
+    content: "Issue " counter(issue);
+}
+
+.example {
+    counter-increment: example;
+}
+.example:not(.no-marker)::before {
+    content: "Example " counter(example);
+}
+.invalid.example:not(.no-marker)::before,
+.illegal.example:not(.no-marker)::before {
+    content: "Invalid Example" counter(example);
+}
+
+figcaption {
+    counter-increment: figure;
+}
+figcaption:not(.no-marker)::before {
+    content: "Figure " counter(figure) " ";
+}</style>
+<style>/* style-dfn-panel */
+
+:root {
+    --dfnpanel-bg: #ddd;
+    --dfnpanel-text: var(--text);
+}
+.dfn-panel {
+    position: absolute;
+    z-index: 35;
+    height: auto;
+    width: -webkit-fit-content;
+    width: fit-content;
+    max-width: 300px;
+    max-height: 500px;
+    overflow: auto;
+    padding: 0.5em 0.75em;
+    font: small Helvetica Neue, sans-serif, Droid Sans Fallback;
+    background: var(--dfnpanel-bg);
+    color: var(--dfnpanel-text);
+    border: outset 0.2em;
+}
+.dfn-panel:not(.on) { display: none; }
+.dfn-panel * { margin: 0; padding: 0; text-indent: 0; }
+.dfn-panel > b { display: block; }
+.dfn-panel a { color: var(--dfnpanel-text); }
+.dfn-panel a:not(:hover) { text-decoration: none !important; border-bottom: none !important; }
+.dfn-panel > b + b { margin-top: 0.25em; }
+.dfn-panel ul { padding: 0; }
+.dfn-panel li { list-style: inside; }
+.dfn-panel.activated {
+    display: inline-block;
+    position: fixed;
+    left: .5em;
+    bottom: 2em;
+    margin: 0 auto;
+    max-width: calc(100vw - 1.5em - .4em - .5em);
+    max-height: 30vh;
+}
+
+.dfn-paneled { cursor: pointer; }
+</style>
+<style>/* style-issues */
+
+a[href].issue-return {
+    float: right;
+    float: inline-end;
+    color: var(--issueheading-text);
+    font-weight: bold;
+    text-decoration: none;
+}
+</style>
+<style>/* style-md-lists */
+
+/* This is a weird hack for me not yet following the commonmark spec
+   regarding paragraph and lists. */
+[data-md] > :first-child {
+    margin-top: 0;
+}
+[data-md] > :last-child {
+    margin-bottom: 0;
+}</style>
+<style>/* style-selflinks */
+
+:root {
+    --selflink-text: white;
+    --selflink-bg: gray;
+    --selflink-hover-text: black;
+}
+.heading, .issue, .note, .example, li, dt {
+    position: relative;
+}
+a.self-link {
+    position: absolute;
+    top: 0;
+    left: calc(-1 * (3.5rem - 26px));
+    width: calc(3.5rem - 26px);
+    height: 2em;
+    text-align: center;
+    border: none;
+    transition: opacity .2s;
+    opacity: .5;
+}
+a.self-link:hover {
+    opacity: 1;
+}
+.heading > a.self-link {
+    font-size: 83%;
+}
+li > a.self-link {
+    left: calc(-1 * (3.5rem - 26px) - 2em);
+}
+dfn > a.self-link {
+    top: auto;
+    left: auto;
+    opacity: 0;
+    width: 1.5em;
+    height: 1.5em;
+    background: var(--selflink-bg);
+    color: var(--selflink-text);
+    font-style: normal;
+    transition: opacity .2s, background-color .2s, color .2s;
+}
+dfn:hover > a.self-link {
+    opacity: 1;
+}
+dfn > a.self-link:hover {
+    color: var(--selflink-hover-text);
+}
+
+a.self-link::before            { content: "¶"; }
+.heading > a.self-link::before { content: "§"; }
+dfn > a.self-link::before      { content: "#"; }
+</style>
+<style>/* style-darkmode */
+
+@media (prefers-color-scheme: dark) {
+    :root {
+        --text: #ddd;
+        --bg: black;
+
+        --unofficial-watermark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='400' height='400'%3E%3Cg fill='%23100808' transform='translate(200 200) rotate(-45) translate(-200 -200)' stroke='%23100808' stroke-width='3'%3E%3Ctext x='50%25' y='220' style='font: bold 70px sans-serif; text-anchor: middle; letter-spacing: 6px;'%3EUNOFFICIAL%3C/text%3E%3Ctext x='50%25' y='305' style='font: bold 70px sans-serif; text-anchor: middle; letter-spacing: 6px;'%3EDRAFT%3C/text%3E%3C/g%3E%3C/svg%3E");
+
+        --logo-bg: #1a5e9a;
+        --logo-active-bg: #c00;
+        --logo-text: white;
+
+        --tocnav-normal-text: #999;
+        --tocnav-normal-bg: var(--bg);
+        --tocnav-hover-text: var(--tocnav-normal-text);
+        --tocnav-hover-bg: #080808;
+        --tocnav-active-text: #f44;
+        --tocnav-active-bg: var(--tocnav-normal-bg);
+
+        --tocsidebar-text: var(--text);
+        --tocsidebar-bg: #080808;
+        --tocsidebar-shadow: rgba(255,255,255,.1);
+        --tocsidebar-heading-text: hsla(203,20%,40%,.7);
+
+        --toclink-text: var(--text);
+        --toclink-underline: #6af;
+        --toclink-visited-text: var(--toclink-text);
+        --toclink-visited-underline: #054572;
+
+        --heading-text: #8af;
+
+        --hr-text: var(--text);
+
+        --algo-border: #456;
+
+        --del-text: #f44;
+        --del-bg: transparent;
+        --ins-text: #4a4;
+        --ins-bg: transparent;
+
+        --a-normal-text: #6af;
+        --a-normal-underline: #555;
+        --a-visited-text: var(--a-normal-text);
+        --a-visited-underline: var(--a-normal-underline);
+        --a-hover-bg: rgba(25%, 25%, 25%, .2);
+        --a-active-text: #f44;
+        --a-active-underline: var(--a-active-text);
+
+        --borderedblock-bg: rgba(255, 255, 255, .05);
+
+        --blockquote-border: silver;
+        --blockquote-bg: var(--borderedblock-bg);
+        --blockquote-text: currentcolor;
+
+        --issue-border: #e05252;
+        --issue-bg: var(--borderedblock-bg);
+        --issue-text: var(--text);
+        --issueheading-text: hsl(0deg, 70%, 70%);
+
+        --example-border: hsl(50deg, 90%, 60%);
+        --example-bg: var(--borderedblock-bg);
+        --example-text: var(--text);
+        --exampleheading-text: hsl(50deg, 70%, 70%);
+
+        --note-border: hsl(120deg, 100%, 35%);
+        --note-bg: var(--borderedblock-bg);
+        --note-text: var(--text);
+        --noteheading-text: hsl(120, 70%, 70%);
+        --notesummary-underline: silver;
+
+        --assertion-border: #444;
+        --assertion-bg: var(--borderedblock-bg);
+        --assertion-text: var(--text);
+
+        --advisement-border: orange;
+        --advisement-bg: #222218;
+        --advisement-text: var(--text);
+        --advisementheading-text: #f84;
+
+        --warning-border: red;
+        --warning-bg: hsla(40,100%,20%,0.95);
+        --warning-text: var(--text);
+
+        --amendment-border: #330099;
+        --amendment-bg: #080010;
+        --amendment-text: var(--text);
+        --amendmentheading-text: #cc00ff;
+
+        --def-border: #8ccbf2;
+        --def-bg: #080818;
+        --def-text: var(--text);
+        --defrow-border: #136;
+
+        --datacell-border: silver;
+
+        --indexinfo-text: #aaa;
+
+        --indextable-hover-text: var(--text);
+        --indextable-hover-bg: #181818;
+
+        --outdatedspec-bg: rgba(255, 255, 255, .5);
+        --outdatedspec-text: black;
+        --outdated-bg: maroon;
+        --outdated-text: white;
+        --outdated-shadow: red;
+
+        --editedrec-bg: darkorange;
+    }
+    /* In case a transparent-bg image doesn't expect to be on a dark bg,
+       which is quite common in practice... */
+    img { background: white; }
+}
+@media (prefers-color-scheme: dark) {
+    :root {
+        --selflink-text: black;
+        --selflink-bg: silver;
+        --selflink-hover-text: white;
+    }
+}
+
+@media (prefers-color-scheme: dark) {
+    :root {
+        --dfnpanel-bg: #222;
+        --dfnpanel-text: var(--text);
+    }
+}</style>
+ </head><body class="h-entry toc-sidebar"><p id="toc-nav"><a id="toc-jump" href="https://aomediacodec.github.io/av1-isobmff/#toc"><span aria-hidden="true">↑</span> <span>Jump to Table of Contents</span></a><a id="toc-toggle" href="https://aomediacodec.github.io/av1-isobmff/#toc"><span aria-hidden="true">←</span> <span>Collapse Sidebar</span></a></p>
+  <div class="head">
+   <p data-fill-with="logo"><a class="logo" href="https://www.aomedia.org/"> <img alt="AOM" height="174" src="./v1.2.0_files/aomedia-icon-only.png" width="174"> </a> </p>
+   <h1 class="p-name no-ref" id="title">AV1 Codec ISO Media File Format Binding</h1>
+   <h2 class="p-name no-num no-toc no-ref heading settled" id="subtitle"><span class="content">v1.2.0</span></h2>
+   <h3 class="no-num no-toc no-ref heading settled" id="profile-and-date"><span class="content">AOM Final Deliverable, <time class="dt-updated" datetime="2019-12-12">12 December 2019</time></span></h3>
+   <div data-fill-with="spec-metadata">
+    <dl>
+     <dt>This version:
+     <dd><a class="u-url" href="https://aomediacodec.github.io/av1-isobmff/v1.2.0.html">https://aomediacodec.github.io/av1-isobmff/v1.2.0.html</a>
+     <dt>Latest version:
+     <dd><a class="u-url" href="https://aomediacodec.github.io/av1-isobmff/">https://aomediacodec.github.io/av1-isobmff/</a>
+     </dd><dt>Issue Tracking:
+     </dt><dd><a href="https://github.com/AOMediaCodec/av1-isobmff/issues/">GitHub</a>
+     </dd><dt class="editor">Editors:
+     </dt><dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:cconcolato@netflix.com">Cyril Concolato</a> (<span class="p-org org">Netflix</span>)
+     </dd><dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:tom.finegan@google.com">Tom Finegan</a> (<span class="p-org org">Google</span>)
+     </dd><dt>Previously approved version:
+     </dt><dd><a href="https://aomediacodec.github.io/av1-isobmff/v1.1.0.html">v1.1.0</a>
+    </dd></dl>
+   </div>
+   <div data-fill-with="warning"></div>
+   <p class="copyright" data-fill-with="copyright">
+    </p><p>Copyright 2019, <a href="https://aomedia.org/">AOM</a></p>
+    <p>Licensing information is available at <a href="http://aomedia.org/license/">http://aomedia.org/license/</a></p>
+    <p>The MATERIALS ARE PROVIDED “AS IS.” The Alliance for Open Media, its members, and its contributors expressly disclaim any warranties (express, implied, or otherwise), including implied warranties of merchantability, non-infringement, fitness for a particular purpose, or title, related to the materials. The entire risk as to implementing or otherwise using the materials is assumed by the implementer and user. IN NO EVENT WILL THE ALLIANCE FOR OPEN MEDIA, ITS MEMBERS, OR CONTRIBUTORS BE LIABLE TO ANY OTHER PARTY FOR LOST PROFITS OR ANY FORM OF INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OF ANY CHARACTER FROM ANY CAUSES OF ACTION OF ANY KIND WITH RESPECT TO THIS DELIVERABLE OR ITS GOVERNING AGREEMENT, WHETHER BASED ON BREACH OF CONTRACT, TORT (INCLUDING NEGLIGENCE), OR OTHERWISE, AND WHETHER OR NOT THE OTHER MEMBER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</p>
+   <p></p>
+   <hr title="Separator for header">
+  </div>
+  <div class="p-summary" data-fill-with="abstract">
+   <h2 class="no-num no-toc no-ref heading settled" id="abstract"><span class="content">Abstract</span></h2>
+   <p>This document specifies the storage format for <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a> bitstreams in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-isobmff">[ISOBMFF]</a> tracks as well as in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cmaf">[CMAF]</a> files.</p>
+  </div>
+  <nav data-fill-with="table-of-contents" id="toc">
+   <h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
+   <ol class="toc" role="directory">
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#bitstream-overview"><span class="secno">1</span> <span class="content">Bitstream features overview</span></a>
+    </li><li>
+     <a href="https://aomediacodec.github.io/av1-isobmff/#basic-encapsulation"><span class="secno">2</span> <span class="content">Basic Encapsulation Scheme</span></a>
+     <ol class="toc">
+      <li><a href="https://aomediacodec.github.io/av1-isobmff/#brands"><span class="secno">2.1</span> <span class="content">General Requirements &amp; Brands</span></a>
+      </li><li>
+       <a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-section"><span class="secno">2.2</span> <span class="content">AV1 Sample Entry</span></a>
+       <ol class="toc">
+        <li><a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-definition"><span class="secno">2.2.1</span> <span class="content">Definition</span></a>
+        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-description"><span class="secno">2.2.2</span> <span class="content">Description</span></a>
+        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-syntax"><span class="secno">2.2.3</span> <span class="content">Syntax</span></a>
+        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-semantics"><span class="secno">2.2.4</span> <span class="content">Semantics</span></a>
+       </li></ol>
+      </li><li>
+       <a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-section"><span class="secno">2.3</span> <span class="content">AV1 Codec Configuration Box</span></a>
+       <ol class="toc">
+        <li><a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-definition"><span class="secno">2.3.1</span> <span class="content">Definition</span></a>
+        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-description"><span class="secno">2.3.2</span> <span class="content">Description</span></a>
+        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-syntax"><span class="secno">2.3.3</span> <span class="content">Syntax</span></a>
+        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-semantics"><span class="secno">2.3.4</span> <span class="content">Semantics</span></a>
+       </li></ol>
+      </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#sampleformat"><span class="secno">2.4</span> <span class="content">AV1 Sample Format</span></a>
+      </li><li>
+       <a href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry"><span class="secno">2.5</span> <span class="content">AV1 Forward Key Frame sample group entry</span></a>
+       <ol class="toc">
+        <li><a href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-definition"><span class="secno">2.5.1</span> <span class="content">Definition</span></a>
+        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-description"><span class="secno">2.5.2</span> <span class="content">Description</span></a>
+        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-syntax"><span class="secno">2.5.3</span> <span class="content">Syntax</span></a>
+        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-semantics"><span class="secno">2.5.4</span> <span class="content">Semantics</span></a>
+       </li></ol>
+      </li><li>
+       <a href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry"><span class="secno">2.6</span> <span class="content">AV1 Multi-Frame sample group entry</span></a>
+       <ol class="toc">
+        <li><a href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry-definition"><span class="secno">2.6.1</span> <span class="content">Definition</span></a>
+        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry-description"><span class="secno">2.6.2</span> <span class="content">Description</span></a>
+        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry-syntax"><span class="secno">2.6.3</span> <span class="content">Syntax</span></a>
+       </li></ol>
+      </li><li>
+       <a href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry"><span class="secno">2.7</span> <span class="content">AV1 Switch Frame sample group entry</span></a>
+       <ol class="toc">
+        <li><a href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry-definition"><span class="secno">2.7.1</span> <span class="content">Definition</span></a>
+        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry-description"><span class="secno">2.7.2</span> <span class="content">Description</span></a>
+        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry-syntax"><span class="secno">2.7.3</span> <span class="content">Syntax</span></a>
+       </li></ol>
+      </li><li>
+       <a href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry"><span class="secno">2.8</span> <span class="content">AV1 Metadata sample group entry</span></a>
+       <ol class="toc">
+        <li><a href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-definition"><span class="secno">2.8.1</span> <span class="content">Definition</span></a>
+        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-description"><span class="secno">2.8.2</span> <span class="content">Description</span></a>
+        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-syntax"><span class="secno">2.8.3</span> <span class="content">Syntax</span></a>
+        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-semantics"><span class="secno">2.8.4</span> <span class="content">Semantics</span></a>
+       </li></ol>
+     </li></ol>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#cmaf"><span class="secno">3</span> <span class="content">CMAF AV1 track format</span></a>
+    </li><li>
+     <a href="https://aomediacodec.github.io/av1-isobmff/#CommonEncryption"><span class="secno">4</span> <span class="content">Common Encryption</span></a>
+     <ol class="toc">
+      <li><a href="https://aomediacodec.github.io/av1-isobmff/#subsample-encryption"><span class="secno">4.1</span> <span class="content">General Subsample Encryption constraints</span></a>
+      </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#subsample-encryption-illustration"><span class="secno">4.2</span> <span class="content">Subsample Encryption Illustration</span></a>
+     </li></ol>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#codecsparam"><span class="secno">5</span> <span class="content">Codecs Parameter String</span></a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#changelist"><span class="secno">6</span> <span class="content">Changes since v1.1.0 release</span></a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#conformance"><span class="secno"></span> <span class="content"> Conformance</span></a>
+    </li><li>
+     <a href="https://aomediacodec.github.io/av1-isobmff/#index"><span class="secno"></span> <span class="content">Index</span></a>
+     <ol class="toc">
+      <li><a href="https://aomediacodec.github.io/av1-isobmff/#index-defined-here"><span class="secno"></span> <span class="content">Terms defined by this specification</span></a>
+      </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#index-defined-elsewhere"><span class="secno"></span> <span class="content">Terms defined by reference</span></a>
+     </li></ol>
+    </li><li>
+     <a href="https://aomediacodec.github.io/av1-isobmff/#references"><span class="secno"></span> <span class="content">References</span></a>
+     <ol class="toc">
+      <li><a href="https://aomediacodec.github.io/av1-isobmff/#normative"><span class="secno"></span> <span class="content">Normative References</span></a>
+     </li></ol>
+   </li></ol>
+  </nav>
+  <main>
+   <h2 class="heading settled" data-level="1" id="bitstream-overview"><span class="secno">1. </span><span class="content">Bitstream features overview</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#bitstream-overview"></a></h2>
+    An <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1" id="ref-for-page=1">AV1 bitstream</a> is composed of a sequence of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39">OBUs</a>, grouped into <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13">Temporal Units</a>. 
+   <p>OBUs are made of a 1 or 2 bytes header, identifying in particular the type of OBU, followed by an optional length field and by an optional payload, whose presence and content depend on the OBU type. Depending on its type, an OBU can carry configuration information, metadata, or coded video data.</p>
+   <p class="note" role="note"><span>NOTE:</span> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121">Tile List OBUs</a> defined in the <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a> specification are not supported in the current version of this specification. A future version of the specification may do so.</p>
+   <p>Temporal Units are processed by a decoder in the order given by the bitstream. Each Temporal Unit is associated with a presentation time. Some Temporal Units may contain multiple frames to be decoded but only one is presented.</p>
+   <p class="note" role="note"><span>NOTE:</span> The AV1 specification defines scalability features, allowing frames from multiple layers or operating points to be present in a single temporal unit. This version of storage in ISOBMFF supports the simple storage of scalable streams in a single track, but does not specify advanced tools for handling multi-track support, layer extraction, or other scalability related use cases. A future version of the specification may do so.</p>
+   <p>Frames carried in Temporal Units may have coding dependencies on frames carried previously in the same Temporal Unit or in previous Temporal Units. Frames that can be decoded without dependencies to previous frames are of two categories: <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13①">Key Frames</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13②">Intra-only Frames</a>. Frames that cannot be decoded independently are of three categories: <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13③">Inter Frames</a>, <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13④">Switch Frames</a>, and frames with a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2">show_existing_frame</a> flag set to 1.</p>
+   <p>Key Frames with the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①">show_frame</a> flag set to 1 have the additional property that after decoding the Key Frame, all frames following the Key Frame in the bitstream can be decoded. They are called <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206">Random Access Points</a> in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a>.</p>
+   <p>Key Frames with the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②">show_frame</a> flag set to 0 are called <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206①">Delayed Random Access Points</a>. <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206②">Delayed Random Access Points</a> have the additional property that if a future <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206③">Key Frame Dependent Recovery Point</a> exists, all frames following that <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206④">Key Frame Dependent Recovery Point</a> can be decoded. A <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑤">Key Frame Dependent Recovery Point</a> is a frame with <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2③">show_existing_frame</a> set to 1 that refers to a previous <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑥">Delayed Random Access Points</a>.</p>
+   <h2 class="heading settled" data-level="2" id="basic-encapsulation"><span class="secno">2. </span><span class="content">Basic Encapsulation Scheme</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#basic-encapsulation"></a></h2>
+   <p>This section describes the basic data structures used to signal encapsulation of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1" id="ref-for-page=1①">AV1 bitstreams</a> in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-isobmff">[ISOBMFF]</a> containers.</p>
+   <h3 class="heading settled" data-level="2.1" id="brands"><span class="secno">2.1. </span><span class="content">General Requirements &amp; Brands</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#brands"></a></h3>
+   <p>A file conformant to this specification satisfies the following:</p>
+   <ul>
+    <li data-md="">
+     <p>It SHALL conform to the normative requirements of <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-isobmff">[ISOBMFF]</a></p>
+    </li><li data-md="">
+     <p>It SHALL have the <dfn class="css" data-dfn-for="ISOBMFF Brand" data-dfn-type="value" data-export="" id="valdef-isobmff-brand-av01">av01<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#valdef-isobmff-brand-av01"></a></dfn> brand among the compatible brands array of the FileTypeBox</p>
+    </li><li data-md="">
+     <p>It SHALL contain at least one track using an <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry" id="ref-for-av1sampleentry">AV1SampleEntry</a></p>
+    </li><li data-md="">
+     <p>It SHOULD indicate a structural ISOBMFF brand among the compatible brands array of the FileTypeBox, such as <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-">iso6</a></p>
+    </li><li data-md="">
+     <p>It MAY indicate CMAF brands as specified in <a href="https://aomediacodec.github.io/av1-isobmff/#cmaf">§ 3 CMAF AV1 track format</a></p>
+    </li><li data-md="">
+     <p>It MAY indicate other brands not specified in this document provided that the associated requirements do not conflict with those given in this specification</p>
+   </li></ul>
+   <p>Parsers SHALL support the structures required by the <code><a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①">iso6</a></code> brand and MAY support structures required by further ISOBMFF structural brands.</p>
+   <h3 class="heading settled" data-level="2.2" id="av1sampleentry-section"><span class="secno">2.2. </span><span class="content">AV1 Sample Entry</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-section"></a></h3>
+   <h4 class="heading settled" data-level="2.2.1" id="av1sampleentry-definition"><span class="secno">2.2.1. </span><span class="content">Definition</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-definition"></a></h4>
+<pre class="def">Sample Entry Type: <dfn data-dfn-for="AV1SampleEntry" data-dfn-type="value" data-export="" id="valdef-av1sampleentry-av01">av01<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#valdef-av1sampleentry-av01"></a></dfn>
+Container:         Sample Description Box ('stsd')
+Mandatory:         Yes
+Quantity:          One or more.
+</pre>
+   <h4 class="heading settled" data-level="2.2.2" id="av1sampleentry-description"><span class="secno">2.2.2. </span><span class="content">Description</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-description"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1sampleentry">AV1SampleEntry</dfn> sample entry identifies that the track contains <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1-sample" id="ref-for-av1-sample">AV1 Samples</a>, and uses an <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox">AV1CodecConfigurationBox</a>.</p>
+   <h4 class="heading settled" data-level="2.2.3" id="av1sampleentry-syntax"><span class="secno">2.2.3. </span><span class="content">Syntax</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-syntax"></a></h4>
+<pre>class AV1SampleEntry extends VisualSampleEntry('av01') {
+  AV1CodecConfigurationBox config;
+}
+</pre>
+   <h4 class="heading settled" data-level="2.2.4" id="av1sampleentry-semantics"><span class="secno">2.2.4. </span><span class="content">Semantics</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-semantics"></a></h4>
+   <p>The <dfn data-dfn-type="dfn" data-noexport="" id="width">width<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#width"></a></dfn> and <dfn data-dfn-type="dfn" data-noexport="" id="height">height<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#height"></a></dfn> fields of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="termref-for-②">VisualSampleEntry</a> SHALL equal the values of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2④">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑤">max_frame_height_minus_1</a> + 1 of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41">Sequence Header OBU</a> applying to the samples associated with this sample entry.</p>
+   <p>The width and height in the TrackHeaderBox SHOULD equal, respectively, the maximum RenderWidth, called MaxRenderWidth, and the maximum RenderHeight, called MaxRenderHeight, of all the frames associated with this sample entry. Additionally, if MaxRenderWidth and MaxRenderHeight values do not equal respectively the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑥">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑦">max_frame_height_minus_1</a> + 1 values of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①">Sequence Header OBU</a>, a PixelAspectRatioBox box SHALL be present in the sample entry and set such that</p>
+<pre>hSpacing / vSpacing = MaxRenderWidth * (max_frame_height_minus_1 + 1) /
+                              ((max_frame_width_minus_1 + 1) * MaxRenderHeight)
+</pre>
+   <p>The <dfn data-dfn-type="dfn" data-noexport="" id="compressorname">compressorname<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#compressorname"></a></dfn> field of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="termref-for-③">VisualSampleEntry</a> is an informative name. It is formatted in a fixed 32-byte field, with the first byte set to the number of bytes to be displayed, followed by that number of bytes of displayable data, followed by padding to complete 32 bytes total (including the size byte). The value "\012AOM Coding" is RECOMMENDED; the first byte is a count of the remaining bytes, here represented by \012, which (being octal 12) is decimal 10, the number of bytes in the rest of the string.</p>
+   <p class="note" role="note"><span>NOTE:</span> Parsers may ignore the value of the compressorname field. It is specified in this document simply for legacy and backwards compatibility reasons.</p>
+   <p>The <dfn data-dfn-type="dfn" data-noexport="" id="config">config<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#config"></a></dfn> field SHALL contain an <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox①">AV1CodecConfigurationBox</a> that applies to the samples associated with this sample entry.</p>
+   <p class="note" role="note"><span>NOTE:</span> Multiple instances of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry" id="ref-for-av1sampleentry①">AV1SampleEntry</a> may be required when the track contains samples requiring a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox②">AV1CodecConfigurationBox</a> with different characteristics.</p>
+   <p>Optional boxes not specifically mentioned here can be present, in particular those indicated in the definition of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="termref-for-④">VisualSampleEntry</a> in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-isobmff">[ISOBMFF]</a>.</p>
+   <h3 class="heading settled" data-level="2.3" id="av1codecconfigurationbox-section"><span class="secno">2.3. </span><span class="content">AV1 Codec Configuration Box</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-section"></a></h3>
+   <h4 class="heading settled" data-level="2.3.1" id="av1codecconfigurationbox-definition"><span class="secno">2.3.1. </span><span class="content">Definition</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-definition"></a></h4>
+<pre class="def">Box Type:  <dfn data-dfn-type="dfn" data-export="" id="av1c">av1C<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1c"></a></dfn>
+Container: AV1 Sample Entry ('av01')
+Mandatory: Yes
+Quantity:  Exactly One
+</pre>
+   <h4 class="heading settled" data-level="2.3.2" id="av1codecconfigurationbox-description"><span class="secno">2.3.2. </span><span class="content">Description</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-description"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1codecconfigurationbox">AV1CodecConfigurationBox</dfn> contains decoder configuration information that SHALL be valid for every sample that references the sample entry.</p>
+   <h4 class="heading settled" data-level="2.3.3" id="av1codecconfigurationbox-syntax"><span class="secno">2.3.3. </span><span class="content">Syntax</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-syntax"></a></h4>
+<pre>class AV1CodecConfigurationBox extends Box('av1C'){
+  AV1CodecConfigurationRecord av1Config;
+}
+
+aligned (8) class AV1CodecConfigurationRecord {
+  unsigned int (1) marker = 1;
+  unsigned int (7) version = 1;
+  unsigned int (3) seq_profile;
+  unsigned int (5) seq_level_idx_0;
+  unsigned int (1) seq_tier_0;
+  unsigned int (1) high_bitdepth;
+  unsigned int (1) twelve_bit;
+  unsigned int (1) monochrome;
+  unsigned int (1) chroma_subsampling_x;
+  unsigned int (1) chroma_subsampling_y;
+  unsigned int (2) chroma_sample_position;
+  unsigned int (3) reserved = 0;
+
+  unsigned int (1) initial_presentation_delay_present;
+  if (initial_presentation_delay_present) {
+    unsigned int (4) initial_presentation_delay_minus_one;
+  } else {
+    unsigned int (4) reserved = 0;
+  }
+
+  unsigned int (8)[] configOBUs;
+}
+</pre>
+   <h4 class="heading settled" data-level="2.3.4" id="av1codecconfigurationbox-semantics"><span class="secno">2.3.4. </span><span class="content">Semantics</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-semantics"></a></h4>
+   <p>The <dfn data-dfn-type="dfn" data-export="" id="marker">marker<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#marker"></a></dfn> field SHALL be set to 1.</p>
+   <p class="note" role="note"><span>NOTE:</span> The marker bit ensures that the bit pattern of the first byte of the AV1CodecConfigurationRecord cannot be mistaken for an <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40" id="ref-for-page=40">OBU Header</a> byte.</p>
+   <p>The <dfn data-dfn-type="dfn" data-noexport="" id="version">version<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#version"></a></dfn> field indicates the version of the AV1CodecConfigurationRecord. The value SHALL be set to 1 for AV1CodecConfigurationRecord.</p>
+   <p>The <dfn data-dfn-type="dfn" data-export="" id="seq_profile">seq_profile<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#seq_profile"></a></dfn> field indicates the AV1 profile and SHALL be equal to the seq_profile value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②">Sequence Header OBU</a>.</p>
+   <p>The <dfn data-dfn-type="dfn" data-export="" id="seq_level_idx_0">seq_level_idx_0<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#seq_level_idx_0"></a></dfn> field indicates the value of seq_level_idx[0] found in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③">Sequence Header OBU</a> and SHALL be equal to the value of seq_level_idx[0] in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41④">Sequence Header OBU</a>.</p>
+   <p>The <dfn data-dfn-type="dfn" data-export="" id="seq_tier_0">seq_tier_0<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#seq_tier_0"></a></dfn> field indicates the value of seq_tier[0] found in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑤">Sequence Header OBU</a> and SHALL be equal to the value of seq_tier[0] in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑥">Sequence Header OBU</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export="" id="high_bitdepth">high_bitdepth</dfn> field indicates the value of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#high_bitdepth" id="ref-for-high_bitdepth">high_bitdepth</a> flag from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑦">Sequence Header OBU</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export="" id="twelve_bit">twelve_bit</dfn> field indicates the value of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#twelve_bit" id="ref-for-twelve_bit">twelve_bit</a> flag from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑧">Sequence Header OBU</a>. When twelve_bit is not present in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑨">Sequence Header OBU</a> the AV1CodecConfigurationRecord twelve_bit value SHALL be 0.</p>
+   <p>The <dfn data-dfn-type="dfn" data-export="" id="monochrome">monochrome<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#monochrome"></a></dfn> field indicates the value of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑧">mono_chrome</a> flag from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⓪">Sequence Header OBU</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export="" id="chroma_subsampling_x">chroma_subsampling_x</dfn> field indicates the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑨">subsampling_x</a> value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①①">Sequence Header OBU</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export="" id="chroma_subsampling_y">chroma_subsampling_y</dfn> field indicates the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⓪">subsampling_y</a> value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①②">Sequence Header OBU</a>.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export="" id="chroma_sample_position">chroma_sample_position</dfn> field indicates the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#chroma_sample_position" id="ref-for-chroma_sample_position">chroma_sample_position</a> value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①③">Sequence Header OBU</a>.</p>
+   <p>When not specified in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①④">Sequence Header OBU</a>, and not defined by the conditions specified in the <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44" id="ref-for-page=44">color_config</a>, the values of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#chroma_subsampling_x" id="ref-for-chroma_subsampling_x">chroma_subsampling_x</a>, <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#chroma_subsampling_y" id="ref-for-chroma_subsampling_y">chroma_subsampling_y</a>, and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#chroma_sample_position" id="ref-for-chroma_sample_position①">chroma_sample_position</a> SHALL be 0.</p>
+   <p>The <dfn data-dfn-type="dfn" data-export="" id="initial_presentation_delay_present">initial_presentation_delay_present<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_present"></a></dfn> field indicates the presence of the initial_presentation_delay_minus_one field.</p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="initial_presentation_delay_minus_one">initial_presentation_delay_minus_one</dfn> field indicates the number of samples (minus one) that need to be decoded prior to starting the presentation of the first sample associated with this sample entry in order to guarantee that each sample will be decoded prior to its presentation time under the constraints of the first level value indicated by <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①①">seq_level_idx</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑤">Sequence Header OBU</a> (in the configOBUs field or in the associated samples). More precisely, the following procedure SHALL not return any error:</p>
+   <ul>
+    <li data-md="">
+     <p>construct a hypothetical bitstream consisting of the OBUs carried in the sample entry followed by the OBUs carried in all the samples referring to that sample entry,</p>
+    </li><li data-md="">
+     <p>set the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①②">initial_display_delay_minus_1</a> field of each <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑥">Sequence Header OBU</a> to the number of frames minus one contained in the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one">initial_presentation_delay_minus_one</a> + 1 samples,</p>
+    </li><li data-md="">
+     <p>set the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①③">frame_presentation_time</a> field of the frame header of each presentable frame such that it matches the presentation time difference between the sample carrying this frame and the previous sample (if it exists, 0 otherwise),</p>
+    </li><li data-md="">
+     <p>apply the decoder model specified in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a> to this hypothetical bitstream using the first operating point. If <code>buffer_removal_time</code> information is present in bitstream for this operating point, the decoding schedule mode SHALL be applied, otherwise the resource availability mode SHALL be applied.</p>
+   </li></ul>
+   <p class="note" role="note"><span>NOTE:</span> With the above procedure, when smooth presentation can be guaranteed after decoding the first sample, initial_presentation_delay_minus_one is 0.</p>
+   <p class="note" role="note"><span>NOTE:</span> Because the above procedure considers all OBUs in all samples associated with a sample entry, if these OBUS form multiple coded video sequences which would have different values of <code>initial_presentation_delay_minus_one</code> if considered separately, the sample entry would signal the larger value.</p>
+   <div class="example" id="example-27bde372">
+    <a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#example-27bde372"></a> The difference between <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one①">initial_presentation_delay_minus_one</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①④">initial_display_delay_minus_1</a> can be illustrated by considering the following example: 
+<pre>a b c d e f g h
+</pre>
+    where letters correspond to frames. Assume that <code><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑤">initial_display_delay_minus_1</a></code> is 2, i.e. that once frame <code>c</code> has been decoded, all other frames in the bitstream can be presented on time. If those frames were grouped into temporal units and samples as follows: 
+<pre>[a] [b c d] [e] [f] [g] [h]
+</pre>
+    <code><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one②">initial_presentation_delay_minus_one</a></code> would be 1 because it takes presentation of 2 samples to ensure that <code>c</code> is decoded.
+But if the frames were grouped as follows: 
+<pre>[a] [b] [c] [d e f] [g] [h]
+</pre>
+    <code><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one③">initial_presentation_delay_minus_one</a></code> would be 2 because it takes presentation of 3 samples to ensure that <code>c</code> is decoded. 
+   </div>
+   <p>The <dfn data-dfn-type="dfn" data-export="" id="configobus">configOBUs<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#configobus"></a></dfn> field contains zero or more OBUs. Any OBU may be present provided that the following procedures produce compliant AV1 bitstreams:</p>
+   <ul>
+    <li data-md="">
+     <p>From any sync sample, an AV1 bitstream is formed by first outputting the OBUs contained in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox③">AV1CodecConfigurationBox</a> and then by outputing all OBUs in the samples themselves, in order, starting from the sync sample.</p>
+    </li><li data-md="">
+     <p>From any sample marked with the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1forwardkeyframesamplegroupentry" id="ref-for-av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</a>, an AV1 bitstream is formed by first outputting the OBUs contained in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox④">AV1CodecConfigurationBox</a> and then by outputing all OBUs in the sample itself, then by outputting all OBUs in the samples, in order, starting from the sample at the distance indicated by the sample group.</p>
+   </li></ul>
+   <p>Additionally, the configOBUs field SHALL contain at most one <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑦">Sequence Header OBU</a> and if present, it SHALL be the first OBU.</p>
+   <p class="note" role="note"><span>NOTE:</span> The configOBUs field is expected to contain only one <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑧">Sequence Header OBU</a> and zero or more <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46">Metadata OBUs</a> when applicable to all the associated samples.</p>
+   <p>OBUs stored in the configOBUs field follow the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑥">open_bitstream_unit</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39①">Low Overhead Bitstream Format</a> syntax as specified in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a>. The flag <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑦">obu_has_size_field</a> SHALL be set to 1, indicating that the size of the OBU payload follows the header, and that it is coded using LEB128.</p>
+   <p>When a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑨">Sequence Header OBU</a> is contained within the configOBUs of the AV1CodecConfigurationRecord, the values present in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⓪">Sequence Header OBU</a> contained within configOBUs SHALL match the values of the AV1CodecConfigurationRecord.</p>
+   <p>The presentation times of AV1 samples are given by the ISOBMFF structures. The <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑧">timing_info_present_flag</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②①">Sequence Header OBU</a> (in the configOBUs field or in the associated samples) SHOULD be set to 0. If set to 1, the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45" id="ref-for-page=45">timing_info</a> structure of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②②">Sequence Header OBU</a>, the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑨">frame_presentation_time</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⓪">buffer_removal_time</a> fields of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49">Frame Header OBUs</a>, if present, SHALL be ignored for the purpose of timed processing of the ISOBMFF file.</p>
+   <p>The sample entry SHOULD contain a <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-⑤">colr</a> box with a colour_type set to <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-⑥">nclx</a>. If present, the values of colour_primaries, transfer_characteristics, and matrix_coefficients SHALL match the values given in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②③">Sequence Header OBU</a> (in the configOBUs field or in the associated samples) if the color_description_present_flag is set to 1. Similarly, the full_range_flag in the <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-⑦">colr</a> box shall match the color_range flag in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②④">Sequence Header OBU</a>. When configOBUs does not contain a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑤">Sequence Header OBU</a>, this box with colour_type set to <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-⑧">nclx</a> SHALL be present.</p>
+   <p>The CleanApertureBox <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-⑨">clap</a> SHOULD not be present.</p>
+   <p>For sample entries corresponding to HDR content, the MasteringDisplayColourVolumeBox <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①⓪">mdcv</a> and ContentLightLevelBox <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①①">clli</a> SHOULD be present, and their values SHALL match the values of contained in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46①">Metadata OBUs</a> of type METADATA_TYPE_HDR_CLL and METADATA_TYPE_HDR_MDCV, if present (in the configOBUs or in the samples).</p>
+   <p class="note" role="note"><span>NOTE:</span> The MasteringDisplayColourVolumeBox <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①②">mdcv</a> and ContentLightLevelBox <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①③">clli</a> have identical syntax to the SMPTE2086MasteringDisplayMetadataBox <a class="property" data-link-type="propdesc" href="https://www.webmproject.org/vp9/mp4/#" id="termref-for-①④">SmDm</a> and ContentLightLevelBox <a class="property" data-link-type="propdesc" href="https://www.webmproject.org/vp9/mp4/#" id="termref-for-①⑤">CoLL</a>, except that they are of type <code>Box</code> and not <code>FullBox</code>. However, the semantics of the MasteringDisplayColourVolumeBox and SMPTE2086MasteringDisplayMetadataBox have important differences and should not be confused.</p>
+   <p>Additional boxes may be provided at the end of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="termref-for-①⑥">VisualSampleEntry</a> as permitted by ISOBMFF, that may represent redundant or similar information to the one provided in some OBUs contained in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox⑤">AV1CodecConfigurationBox</a>. If the box definition does not indicate that its information overrides the OBU information, in case of conflict, the OBU information should be considered authoritative.</p>
+   <h3 class="heading settled" data-level="2.4" id="sampleformat"><span class="secno">2.4. </span><span class="content">AV1 Sample Format</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#sampleformat"></a></h3>
+   <p>For tracks using the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry" id="ref-for-av1sampleentry②">AV1SampleEntry</a>, an <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1-sample">AV1 Sample</dfn> has the following constraints:</p>
+   <ul>
+    <li data-md="">
+     <p>the sample data SHALL be a sequence of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39②">OBUs</a> forming a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑤">Temporal Unit</a>,</p>
+    </li><li data-md="">
+     <p>each OBU SHALL follow the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②①">open_bitstream_unit</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39③">Low Overhead Bitstream Format</a> syntax as specified in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a>. Each OBU SHALL have the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②②">obu_has_size_field</a> set to 1 except for the last OBU in the sample, for which <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②③">obu_has_size_field</a> MAY be set to 0, in which case it is assumed to fill the remainder of the sample,</p>
+   </li></ul>
+   <p class="note" role="note"><span>NOTE:</span> When extracting OBUs from an ISOBMFF file, and depending on the capabilities of the decoder processing these OBUs, ISOBMFF parsers MAY need to either: set the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②④">obu_has_size_field</a> to 1 for some OBUs if not already set, add the size field in this case, and add <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46②">Temporal Delimiter OBU</a>; or use the length-delimited bitstream format as defined in Annex B of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1s" id="ref-for-av1s">AV1</a>. If encryption is used, similar operations MAY have to be done before or after decryption depending on the demuxer/decryptor/decoder architecture.</p>
+   <ul>
+    <li data-md="">
+     <p>OBU trailing bits SHOULD be limited to byte alignment and SHOULD not be used for padding,</p>
+    </li><li data-md="">
+     <p>OBUs of type OBU_TEMPORAL_DELIMITER, OBU_PADDING, or OBU_REDUNDANT_FRAME_HEADER SHOULD NOT be used.</p>
+    </li><li data-md="">
+     <p>OBUs of type OBU_TILE_LIST SHALL NOT be used.</p>
+   </li></ul>
+   <p>If an AV1 Sample is signaled as a sync sample (in the SyncSampleBox or by setting sample_is_non_sync_sample to 0), it SHALL be a Random Access Point as defined in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a>, i.e. satisfy the following constraints:</p>
+   <ul>
+    <li data-md="">
+     <p>Its first frame is a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑥">Key Frame</a> that has <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑤">show_frame</a> flag set to 1,</p>
+    </li><li data-md="">
+     <p>It contains a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑥">Sequence Header OBU</a> before the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49①">Frame Header OBU</a>.</p>
+   </li></ul>
+   <p class="note" role="note"><span>NOTE:</span> Within this definition, a sync sample may contain additional frames that are not Key Frames. The fact that none of them is the first frame in the temporal unit ensures that they are decodable.</p>
+   <p class="note" role="note"><span>NOTE:</span> Other types of OBUs such as <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46③">metadata OBUs</a> could be present before the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑦">Sequence Header OBU</a>.</p>
+   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑦">Intra-only frames</a> SHOULD be signaled using the sample_depends_on flag set to 2.</p>
+   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑦">Delayed Random Access Points</a> SHOULD be signaled using sample groups and the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1forwardkeyframesamplegroupentry" id="ref-for-av1forwardkeyframesamplegroupentry①">AV1ForwardKeyFrameSampleGroupEntry</a>.</p>
+   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑧">Switch Frames</a> SHOULD be signaled using sample groups and the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1switchframesamplegroupentry" id="ref-for-av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</a>.</p>
+   <p>Additionally, if a file contains multiple tracks that are alternative representations of the same content, in particular using <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑨">Switch Frames</a>, those tracks SHOULD be marked as belonging to the same alternate group and should use a track selection box with an appropriate attribute (e.g. <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①⑦">bitr</a>).</p>
+   <p>In tracks using the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry" id="ref-for-av1sampleentry③">AV1SampleEntry</a>, the <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①⑧">ctts</a> box and composition offsets in movie fragments SHALL NOT be used. Similarly, the is_leading flag, if used, SHALL be set to 0 or 2.</p>
+   <p>When a temporal unit contains more than one frame, the sample corresponding to that temporal unit MAY be marked using the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1multiframesamplegroupentry" id="ref-for-av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</a>.</p>
+   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46④">Metadata OBUs</a> may be carried in sample data. In this case, the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1metadatasamplegroupentry" id="ref-for-av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</a> SHOULD be used. If the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑤">metadata OBUs</a> are static for the entire set of samples associated with a given sample description entry, they SHOULD also be in the OBU array in the sample description entry.</p>
+   <p>Unless explicitely stated, the grouping_type_parameter is not defined for the SampleToGroupBox with grouping types defined in this specification.</p>
+   <h3 class="heading settled" data-level="2.5" id="forwardkeyframesamplegroupentry"><span class="secno">2.5. </span><span class="content">AV1 Forward Key Frame sample group entry</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry"></a></h3>
+   <h4 class="heading settled" data-level="2.5.1" id="forwardkeyframesamplegroupentry-definition"><span class="secno">2.5.1. </span><span class="content">Definition</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-definition"></a></h4>
+<pre class="def">Group Type: <dfn data-dfn-type="dfn" data-export="" id="av1f">av1f<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1f"></a></dfn>
+Container:  Sample Group Description Box ('sgpd')
+Mandatory:  No
+Quantity:   Zero or more.
+</pre>
+   <h4 class="heading settled" data-level="2.5.2" id="forwardkeyframesamplegroupentry-description"><span class="secno">2.5.2. </span><span class="content">Description</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-description"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</dfn> documents samples that contain a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑧">Delayed Random Access Point</a> that are followed at a given distance in the bitstream by a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑨">Key Frame Dependent Recovery Point</a>.</p>
+   <h4 class="heading settled" data-level="2.5.3" id="forwardkeyframesamplegroupentry-syntax"><span class="secno">2.5.3. </span><span class="content">Syntax</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-syntax"></a></h4>
+<pre>class AV1ForwardKeyFrameSampleGroupEntry extends VisualSampleGroupEntry('av1f') {
+  unsigned int(8) fwd_distance;
+}
+</pre>
+   <h4 class="heading settled" data-level="2.5.4" id="forwardkeyframesamplegroupentry-semantics"><span class="secno">2.5.4. </span><span class="content">Semantics</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-semantics"></a></h4>
+   <p>The <dfn data-dfn-type="dfn" data-export="" id="fwd_distance">fwd_distance<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#fwd_distance"></a></dfn> field indicates the number of samples between this sample and the next sample containing the associated <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206①⓪">Key Frame Dependent Recovery Point</a>. 0 means the next sample.</p>
+   <h3 class="heading settled" data-level="2.6" id="multiframesamplegroupentry"><span class="secno">2.6. </span><span class="content">AV1 Multi-Frame sample group entry</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry"></a></h3>
+   <h4 class="heading settled" data-level="2.6.1" id="multiframesamplegroupentry-definition"><span class="secno">2.6.1. </span><span class="content">Definition</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry-definition"></a></h4>
+<pre class="def">Group Type: <dfn data-dfn-for="AV1MultiFrameSampleGroupEntry" data-dfn-type="value" data-export="" id="valdef-av1multiframesamplegroupentry-av1m">av1m<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#valdef-av1multiframesamplegroupentry-av1m"></a></dfn>
+Container:  Sample Group Description Box ('sgpd')
+Mandatory:  No
+Quantity:   Zero or more.
+</pre>
+   <h4 class="heading settled" data-level="2.6.2" id="multiframesamplegroupentry-description"><span class="secno">2.6.2. </span><span class="content">Description</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry-description"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</dfn> documents samples that contain multiple frames.</p>
+   <h4 class="heading settled" data-level="2.6.3" id="multiframesamplegroupentry-syntax"><span class="secno">2.6.3. </span><span class="content">Syntax</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry-syntax"></a></h4>
+<pre>class AV1MultiFrameSampleGroupEntry extends VisualSampleGroupEntry('av1m') {
+}
+</pre>
+   <h3 class="heading settled" data-level="2.7" id="switchframesamplegroupentry"><span class="secno">2.7. </span><span class="content">AV1 Switch Frame sample group entry</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry"></a></h3>
+   <h4 class="heading settled" data-level="2.7.1" id="switchframesamplegroupentry-definition"><span class="secno">2.7.1. </span><span class="content">Definition</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry-definition"></a></h4>
+<pre class="def">Group Type: <dfn class="dfn-paneled" data-dfn-type="dfn" data-export="" id="av1s">av1s</dfn>
+Container:  Sample Group Description Box ('sgpd')
+Mandatory:  No
+Quantity:   Zero or more.
+</pre>
+   <h4 class="heading settled" data-level="2.7.2" id="switchframesamplegroupentry-description"><span class="secno">2.7.2. </span><span class="content">Description</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry-description"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</dfn> documents samples that start with a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13①⓪">Switch Frame</a>.</p>
+   <h4 class="heading settled" data-level="2.7.3" id="switchframesamplegroupentry-syntax"><span class="secno">2.7.3. </span><span class="content">Syntax</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry-syntax"></a></h4>
+<pre>class AV1SwitchFrameSampleGroupEntry extends VisualSampleGroupEntry('av1s') {
+}
+</pre>
+   <h3 class="heading settled" data-level="2.8" id="metadatasamplegroupentry"><span class="secno">2.8. </span><span class="content">AV1 Metadata sample group entry</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry"></a></h3>
+   <h4 class="heading settled" data-level="2.8.1" id="metadatasamplegroupentry-definition"><span class="secno">2.8.1. </span><span class="content">Definition</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-definition"></a></h4>
+<pre class="def">Group Type: <dfn data-dfn-for="AV1MetadataSampleGroupEntry" data-dfn-type="value" data-noexport="" id="valdef-av1metadatasamplegroupentry-av1m">av1M<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#valdef-av1metadatasamplegroupentry-av1m"></a></dfn>
+Container:  Sample Group Description Box ('sgpd')
+Mandatory:  No
+Quantity:   Zero or more.
+</pre>
+   <h4 class="heading settled" data-level="2.8.2" id="metadatasamplegroupentry-description"><span class="secno">2.8.2. </span><span class="content">Description</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-description"></a></h4>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</dfn> documents samples that contain <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑥">metadata OBUs</a>. The <code>grouping_type_parameter</code> can be used to identify samples containing <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑦">metadata OBUs</a> of a given type. If no <code>grouping_type_parameter</code> is provided, the sample group entry identifies samples containing <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑧">metadata OBUs</a> for which the <code>metadata_type</code> is unknown.</p>
+   <h4 class="heading settled" data-level="2.8.3" id="metadatasamplegroupentry-syntax"><span class="secno">2.8.3. </span><span class="content">Syntax</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-syntax"></a></h4>
+<pre>class AV1MetadataSampleGroupEntry extends VisualSampleGroupEntry('av1M') {
+}
+</pre>
+   <p>For this sample group entry, the <code>grouping_type_parameter</code> syntax is as follows:</p>
+<pre>{
+   unsigned int (8) metadata_type;
+   unsigned int (24) metadata_specific_parameters;
+}
+</pre>
+   <h4 class="heading settled" data-level="2.8.4" id="metadatasamplegroupentry-semantics"><span class="secno">2.8.4. </span><span class="content">Semantics</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-semantics"></a></h4>
+   <p><dfn data-dfn-type="dfn" data-export="" id="metadata_type">metadata_type<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadata_type"></a></dfn> is a 8-bit field whose value is the value of the metadata_type field defined in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a>, when it is equal or lower than 255. metadata_type values above 255 are not supported by this sample group.</p>
+   <p><dfn data-dfn-type="dfn" data-export="" id="metadata_specific_parameters">metadata_specific_parameters<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadata_specific_parameters"></a></dfn> provides an additional part of the <code>grouping_type_parameter</code>, which MAY be used to distinguish different sample groups having the same <code>metadata_type</code> but different sub-parameters. In this version of the specification, <code>metadata_specific_parameters</code> is only defined when <code>metadata_type</code> is set to <code>METADATA_TYPE_ITUT_T35</code> in which case its value SHALL be set to the first 24 bits of the <code>metadata_itut_t35</code> structure. For other types of metadata, its value SHOULD be set to 0. In all cases, when the <code>grouping_type_parameter</code> is used, readers processing sample groups SHALL use the entire value of <code>grouping_type_parameter</code>.</p>
+   <h2 class="heading settled" data-level="3" id="cmaf"><span class="secno">3. </span><span class="content">CMAF AV1 track format</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#cmaf"></a></h2>
+   <p><a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cmaf">[CMAF]</a> defines structural constraints on ISOBMFF files additional to <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-isobmff">[ISOBMFF]</a> for the purpose of, for example, adaptive streaming or for protected files. Conformance to these structural constraints is signaled by the presence of the brand <code><a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="termref-for-①⑨">cmfc</a></code> in the <code>FileTypeBox</code>.</p>
+   <p>If a <a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="termref-for-②⓪">CMAF Video Track</a> uses the brand <code>av01</code>, it is called a <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="cmaf-av1-track">CMAF AV1 Track</dfn> and the following constraints, defining the CMAF Media Profile for AV1, apply:</p>
+   <ul>
+    <li data-md="">
+     <p>it SHALL use an <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry" id="ref-for-av1sampleentry④">AV1SampleEntry</a></p>
+    </li><li data-md="">
+     <p>it MAY use multiple sample entries, and in that case the following values SHALL not change in the track:</p>
+     <ul>
+      <li data-md="">
+       <p><code>seq_profile</code></p>
+      </li><li data-md="">
+       <p><code>still_picture</code></p>
+      </li><li data-md="">
+       <p>the first value of <code>seq_level_idx</code></p>
+      </li><li data-md="">
+       <p>the first value of <code>seq_tier</code></p>
+      </li><li data-md="">
+       <p><code>color_config</code></p>
+      </li><li data-md="">
+       <p><code>initial_presentation_delay_minus_one</code></p>
+     </li></ul>
+   </li></ul>
+   <p>When protected, <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#cmaf-av1-track" id="ref-for-cmaf-av1-track">CMAF AV1 Tracks</a> SHALL use the signaling defined in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cmaf">[CMAF]</a>, which in turn relies on <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cenc">[CENC]</a>, with the provisions specified in <a href="https://aomediacodec.github.io/av1-isobmff/#CommonEncryption">§ 4 Common Encryption</a>.</p>
+   <h2 class="heading settled" data-level="4" id="CommonEncryption"><span class="secno">4. </span><span class="content">Common Encryption</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#CommonEncryption"></a></h2>
+   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#cmaf-av1-track" id="ref-for-cmaf-av1-track①">CMAF AV1 Tracks</a> and non-segmented AV1 files MAY be protected. If protected, they SHALL conform to <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cenc">[CENC]</a>. Files SHOULD be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②①">cbcs</a></code> protection scheme and MAY be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②②">cenc</a></code> protection scheme.</p>
+   <p>When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②③">cenc</a></code> is used, samples SHALL be protected using subsample encryption and SHALL NOT use pattern encryption.</p>
+   <p>When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②④">cbcs</a></code> is used, samples SHALL be protected using subsample encryption and SHALL use pattern encryption. <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cenc">[CENC]</a> recommends that the Block Pattern length be 10, i.e. <code>crypt_byte_block + skip_byte_block = 10</code>, where a Block is of size 16-bytes. In this specification, the combination of <code>crypt_byte_block</code> and <code>skip_byte_block</code> SHALL be one of the following, with the first one being recommended:</p>
+   <ul>
+    <li data-md="">
+     <p><code>crypt_byte_block = 1</code> and <code>skip_byte_block = 9</code>,</p>
+    </li><li data-md="">
+     <p><code>crypt_byte_block = 5</code> and <code>skip_byte_block = 5</code>,</p>
+    </li><li data-md="">
+     <p><code>crypt_byte_block = 10</code> and <code>skip_byte_block = 0</code>.</p>
+   </li></ul>
+   <h3 class="heading settled" data-level="4.1" id="subsample-encryption"><span class="secno">4.1. </span><span class="content">General Subsample Encryption constraints</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#subsample-encryption"></a></h3>
+   <p>Within protected samples, the following constraints apply:</p>
+   <ul>
+    <li data-md="">
+     <p>Protected samples SHALL be exactly spanned by one or more contiguous subsamples.</p>
+     <ul>
+      <li data-md="">
+       <p>An OBU MAY be spanned by one or more subsamples, especially when it has multiple ranges of protected data. However, as recommended in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cenc">[CENC]</a>, writers SHOULD reduce the number of subsamples as possible. This can be achieved by using a subsample that spans multiple consecutive unprotected OBUs as well as the first unprotected and protected parts of the following protected OBU, if such protected OBU exists.</p>
+      </li><li data-md="">
+       <p>A large unprotected OBU whose data size is larger than the maximum size of a single <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②⑤">BytesOfClearData</a> field MAY be spanned by multiple subsamples with zero size <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②⑥">BytesOfProtectedData</a>.</p>
+     </li></ul>
+    </li><li data-md="">
+     <p>All <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40" id="ref-for-page=40①">OBU Headers</a> and associated <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑥">obu_size</a> fields SHALL be unprotected.</p>
+    </li><li data-md="">
+     <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑨">Temporal Delimiter OBUs</a>, <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑧">Sequence Header OBUs</a>, and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49②">Frame Header OBUs</a> (including within a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71">Frame OBU</a>), <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121①">Redundant Frame Header OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121②">Padding OBUs</a> SHALL be unprotected.</p>
+    </li><li data-md="">
+     <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46①⓪">Metadata OBUs</a> MAY be protected.</p>
+    </li><li data-md="">
+     <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71①">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71②">Frame OBUs</a> SHALL be protected. Within <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71③">Tile Group OBUs</a> or <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71④">Frame OBUs</a>, the following applies:</p>
+     <ul>
+      <li data-md="">
+       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②⑦">cbcs</a></code>:</p>
+       <ul>
+        <li data-md="">
+         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②⑧">BytesOfProtectedData</a> SHALL start on the first byte and end on the last byte of the <code>decode_tile</code> structure (including any trailing bits).</p>
+       </li></ul>
+       <p class="note" role="note"><span>NOTE:</span> As a result of the above, <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②⑨">BytesOfProtectedData</a> is not necessarily a multiple of 16 bytes and partial blocks are included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③⓪">BytesOfProtectedData</a> range, but per <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cenc">[CENC]</a> the data is not be encrypted.</p>
+       <ul>
+        <li data-md="">
+         <p>A subsample SHALL be created for each tile, even if its size is less than 16 bytes.</p>
+        </li><li data-md="">
+         <p>All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑤">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑥">Frame OBUs</a> SHALL be unprotected.</p>
+       </li></ul>
+      </li><li data-md="">
+       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③①">cenc</a></code>:</p>
+       <ul>
+        <li data-md="">
+         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③②">BytesOfProtectedData</a> SHALL be a multiple of 16 bytes.</p>
+        </li><li data-md="">
+         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③③">BytesOfProtectedData</a> SHALL end on the last byte of the <code>decode_tile</code> structure (including any trailing bits).</p>
+        </li><li data-md="">
+         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③④">BytesOfProtectedData</a> SHALL span all complete 16-byte blocks of the <code>decode_tile</code> structure (including any trailing bits).</p>
+       </li></ul>
+       <p class="note" role="note"><span>NOTE:</span> As a result of the above, partial blocks are not used and it is possible that <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③⑤">BytesOfProtectedData</a> does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.</p>
+       <ul>
+        <li data-md="">
+         <p>A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes. If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③⑥">BytesOfClearData</a> field of a surrounding subsample, if any.</p>
+        </li><li data-md="">
+         <p>All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑦">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑧">Frame OBUs</a> SHALL be unprotected.</p>
+       </li></ul>
+     </li></ul>
+   </li></ul>
+   <h3 class="heading settled" data-level="4.2" id="subsample-encryption-illustration"><span class="secno">4.2. </span><span class="content">Subsample Encryption Illustration</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#subsample-encryption-illustration"></a></h3>
+    Figure #1 illustrates Subsample based encryption of AV1. 
+   <figure>
+     <img alt="Subsample-based AV1 encryption" src="./v1.2.0_files/subsample_encryption.svg"> 
+    <figcaption>Subsample-based AV1 encryption.</figcaption>
+   </figure>
+   <h2 class="heading settled" data-level="5" id="codecsparam"><span class="secno">5. </span><span class="content">Codecs Parameter String</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#codecsparam"></a></h2>
+   <p>DASH and other applications require defined values for the <a class="property" data-link-type="propdesc" href="https://tools.ietf.org/html/rfc6381#" id="termref-for-③⑦">Codecs</a> parameter specified in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-rfc6381">[RFC6381]</a> for ISO Media tracks. The codecs parameter string for the AOM AV1 codec is as follows:</p>
+<pre>&lt;sample entry 4CC&gt;.&lt;profile&gt;.&lt;level&gt;&lt;tier&gt;.&lt;bitDepth&gt;.&lt;monochrome&gt;.&lt;chromaSubsampling&gt;.
+&lt;colorPrimaries&gt;.&lt;transferCharacteristics&gt;.&lt;matrixCoefficients&gt;.&lt;videoFullRangeFlag&gt;
+</pre>
+   <p>All fields following the sample entry 4CC are expressed as double digit decimals, unless indicated otherwise. Leading or trailing zeros cannot be omitted.</p>
+   <p>The profile parameter value, represented by a single digit decimal, SHALL equal the value of seq_profile in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑨">Sequence Header OBU</a>.</p>
+   <p>The level parameter value SHALL equal the first level value indicated by <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑦">seq_level_idx</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③⓪">Sequence Header OBU</a>.</p>
+   <p>The tier parameter value SHALL be equal to <code>M</code> when the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑧">seq_tier</a> value in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③①">Sequence Header OBU</a> is equal to 0, and <code>H</code> when it is equal to 1.</p>
+   <p>The bitDepth parameter value SHALL equal the value of BitDepth variable as defined in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a> derived from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③②">Sequence Header OBU</a>.</p>
+   <p>The monochrome parameter value, represented by a single digit decimal, SHALL equal the value of mono_chrome in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③③">Sequence Header OBU</a>.</p>
+   <p>The chromaSubsampling parameter value, represented by a three-digit decimal, SHALL have its first digit equal to subsampling_x and its second digit equal to subsampling_y. If both subsampling_x and subsampling_y are set to 1, then the third digit SHALL be equal to chroma_sample_position, otherwise it SHALL be set to 0.</p>
+   <p>The colorPrimaries, transferCharacteristics, matrixCoefficients, and videoFullRangeFlag parameter values SHALL equal the value of matching fields in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③④">Sequence Header OBU</a>, if color_description_present_flag is set to 1, otherwise they SHOULD not be set, defaulting to the values below. The videoFullRangeFlag is represented by a single digit.</p>
+   <p>For example, codecs="av01.0.04M.10.0.112.09.16.09.0" represents AV1 Main Profile, level 3.0, Main tier, 10-bit content, non-monochrome, with 4:2:0 chroma subsampling co-located with (0, 0) luma sample, ITU-R BT.2100 color primaries, ITU-R BT.2100 PQ transfer characteristics, ITU-R BT.2100 YCbCr color matrix, and studio swing representation.</p>
+   <p>The parameters sample entry 4CC, profile, level, tier, and bitDepth are all mandatory fields. If any of these fields are empty, or not within their allowed range, the processing device SHOULD treat it as an error.</p>
+   <p>All the other fields (including their leading '.') are optional, mutually inclusive (all or none) fields. If not specified then the values listed in the table below are assumed.</p>
+   <table class="def">
+    <tbody>
+     <tr>
+      <td>mono_chrome
+      </td><td>0
+     </td></tr><tr>
+      <td>chromaSubsampling
+      </td><td>110 (4:2:0)
+     </td></tr><tr>
+      <td>colorPrimaries
+      </td><td>1 (ITU-R BT.709)
+     </td></tr><tr>
+      <td>transferCharacteristics
+      </td><td>1 (ITU-R BT.709)
+     </td></tr><tr>
+      <td>matrixCoefficients
+      </td><td>1 (ITU-R BT.709)
+     </td></tr><tr>
+      <td>videoFullRangeFlag
+      </td><td>0 (studio swing representation)
+   </td></tr></tbody></table>
+   <p>The string codecs="av01.0.01M.08" in this case would represent AV1 Main Profile, level 2.1, Main tier, 8-bit content with 4:2:0 chroma subsampling, ITU-R BT.709 color primaries, transfer characteristics, matrix coefficients, and studio swing representation.</p>
+   <p>If any character that is not '.', digits, part of the AV1 4CC, or a tier value is encountered, the string SHALL be interpreted ignoring all the characters starting from that character.</p>
+   <h2 class="heading settled" data-level="6" id="changelist"><span class="secno">6. </span><span class="content">Changes since v1.1.0 release</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#changelist"></a></h2>
+   <ul>
+    <li data-md="">
+     <p><a href="https://github.com/AOMediaCodec/av1-isobmff/pull/116"> Change tile/subsample alignement for the <code>cbcs</code> protection scheme.</a></p>
+   </li></ul>
+  </main>
+  <div data-fill-with="conformance">
+   <h2 class="no-ref no-num heading settled" id="conformance"><span class="content"> Conformance</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#conformance"></a></h2>
+   <p> Conformance requirements are expressed with a combination of descriptive assertions and RFC 2119 terminology.
+            The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL”
+            in the normative parts of this document
+            are to be interpreted as described in RFC 2119.
+            However, for readability,
+            these words do not appear in all uppercase letters in this specification. </p>
+   <p> All of the text of this specification is normative
+            except sections explicitly marked as non-normative, examples, and notes. <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-rfc2119">[RFC2119]</a> </p>
+   <p> Examples in this specification are introduced with the words “for example”
+            or are set apart from the normative text with <code>class="example"</code>, like this: </p>
+   <div class="example" id="example-example"><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#example-example"></a> This is an example of an informative example. </div>
+   <p> Informative notes begin with the word “Note”
+            and are set apart from the normative text with <code>class="note"</code>, like this: </p>
+   <p class="note" role="note"> Note, this is an informative note. </p>
+  </div>
+<script>
+(function() {
+  "use strict";
+  var collapseSidebarText = '<span aria-hidden="true">←</span> '
+                          + '<span>Collapse Sidebar</span>';
+  var expandSidebarText   = '<span aria-hidden="true">→</span> '
+                          + '<span>Pop Out Sidebar</span>';
+  var tocJumpText         = '<span aria-hidden="true">↑</span> '
+                          + '<span>Jump to Table of Contents</span>';
+
+  var sidebarMedia = window.matchMedia('screen and (min-width: 78em)');
+  var autoToggle   = function(e){ toggleSidebar(e.matches) };
+  if(sidebarMedia.addListener) {
+    sidebarMedia.addListener(autoToggle);
+  }
+
+  function toggleSidebar(on) {
+    if (on == undefined) {
+      on = !document.body.classList.contains('toc-sidebar');
+    }
+
+    /* Don’t scroll to compensate for the ToC if we’re above it already. */
+    var headY = 0;
+    var head = document.querySelector('.head');
+    if (head) {
+      // terrible approx of "top of ToC"
+      headY += head.offsetTop + head.offsetHeight;
+    }
+    var skipScroll = window.scrollY < headY;
+
+    var toggle = document.getElementById('toc-toggle');
+    var tocNav = document.getElementById('toc');
+    if (on) {
+      var tocHeight = tocNav.offsetHeight;
+      document.body.classList.add('toc-sidebar');
+      document.body.classList.remove('toc-inline');
+      toggle.innerHTML = collapseSidebarText;
+      if (!skipScroll) {
+        window.scrollBy(0, 0 - tocHeight);
+      }
+      tocNav.focus();
+      sidebarMedia.addListener(autoToggle); // auto-collapse when out of room
+    }
+    else {
+      document.body.classList.add('toc-inline');
+      document.body.classList.remove('toc-sidebar');
+      toggle.innerHTML = expandSidebarText;
+      if (!skipScroll) {
+        window.scrollBy(0, tocNav.offsetHeight);
+      }
+      if (toggle.matches(':hover')) {
+        /* Unfocus button when not using keyboard navigation,
+           because I don’t know where else to send the focus. */
+        toggle.blur();
+      }
+    }
+  }
+
+  function createSidebarToggle() {
+    /* Create the sidebar toggle in JS; it shouldn’t exist when JS is off. */
+    var toggle = document.createElement('a');
+      /* This should probably be a button, but appearance isn’t standards-track.*/
+    toggle.id = 'toc-toggle';
+    toggle.class = 'toc-toggle';
+    toggle.href = '#toc';
+    toggle.innerHTML = collapseSidebarText;
+
+    sidebarMedia.addListener(autoToggle);
+    var toggler = function(e) {
+      e.preventDefault();
+      sidebarMedia.removeListener(autoToggle); // persist explicit off states
+      toggleSidebar();
+      return false;
+    }
+    toggle.addEventListener('click', toggler, false);
+
+
+    /* Get <nav id=toc-nav>, or make it if we don’t have one. */
+    var tocNav = document.getElementById('toc-nav');
+    if (!tocNav) {
+      tocNav = document.createElement('p');
+      tocNav.id = 'toc-nav';
+      /* Prepend for better keyboard navigation */
+      document.body.insertBefore(tocNav, document.body.firstChild);
+    }
+    /* While we’re at it, make sure we have a Jump to Toc link. */
+    var tocJump = document.getElementById('toc-jump');
+    if (!tocJump) {
+      tocJump = document.createElement('a');
+      tocJump.id = 'toc-jump';
+      tocJump.href = '#toc';
+      tocJump.innerHTML = tocJumpText;
+      tocNav.appendChild(tocJump);
+    }
+
+    tocNav.appendChild(toggle);
+  }
+
+  var toc = document.getElementById('toc');
+  if (toc) {
+    createSidebarToggle();
+    toggleSidebar(sidebarMedia.matches);
+
+    /* If the sidebar has been manually opened and is currently overlaying the text
+       (window too small for the MQ to add the margin to body),
+       then auto-close the sidebar once you click on something in there. */
+    toc.addEventListener('click', function(e) {
+      if(e.target.tagName.toLowerCase() == "a" && document.body.classList.contains('toc-sidebar') && !sidebarMedia.matches) {
+        toggleSidebar(false);
+      }
+    }, false);
+  }
+  else {
+    console.warn("Can’t find Table of Contents. Please use <nav id='toc'> around the ToC.");
+  }
+
+  /* Wrap tables in case they overflow */
+  var tables = document.querySelectorAll(':not(.overlarge) > table.data, :not(.overlarge) > table.index');
+  var numTables = tables.length;
+  for (var i = 0; i < numTables; i++) {
+    var table = tables[i];
+    var wrapper = document.createElement('div');
+    wrapper.className = 'overlarge';
+    table.parentNode.insertBefore(wrapper, table);
+    wrapper.appendChild(table);
+  }
+
+})();
+</script>
+  <h2 class="no-num no-ref heading settled" id="index"><span class="content">Index</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#index"></a></h2>
+  <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="content">Terms defined by this specification</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#index-defined-here"></a></h3>
+  <ul class="index">
+   <li>
+    av01
+    <ul>
+     <li><a href="https://aomediacodec.github.io/av1-isobmff/#valdef-av1sampleentry-av01">value for AV1SampleEntry</a><span>, in § 2.2.1</span>
+     </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#valdef-isobmff-brand-av01">value for ISOBMFF Brand</a><span>, in § 2.1</span>
+    </li></ul>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1c">av1C</a><span>, in § 2.3.1</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox">AV1CodecConfigurationBox</a><span>, in § 2.3.2</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1f">av1f</a><span>, in § 2.5.1</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</a><span>, in § 2.5.2</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#valdef-av1metadatasamplegroupentry-av1m">av1M</a><span>, in § 2.8.1</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#valdef-av1multiframesamplegroupentry-av1m">av1m</a><span>, in § 2.6.1</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</a><span>, in § 2.8.2</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</a><span>, in § 2.6.2</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1s">av1s</a><span>, in § 2.7.1</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1-sample">AV1 Sample</a><span>, in § 2.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry">AV1SampleEntry</a><span>, in § 2.2.2</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</a><span>, in § 2.7.2</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#chroma_sample_position">chroma_sample_position</a><span>, in § 2.3.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#chroma_subsampling_x">chroma_subsampling_x</a><span>, in § 2.3.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#chroma_subsampling_y">chroma_subsampling_y</a><span>, in § 2.3.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#cmaf-av1-track">CMAF AV1 Track</a><span>, in § 3</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#compressorname">compressorname</a><span>, in § 2.2.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#config">config</a><span>, in § 2.2.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#configobus">configOBUs</a><span>, in § 2.3.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#fwd_distance">fwd_distance</a><span>, in § 2.5.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#height">height</a><span>, in § 2.2.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#high_bitdepth">high_bitdepth</a><span>, in § 2.3.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_minus_one">initial_presentation_delay_minus_one</a><span>, in § 2.3.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_present">initial_presentation_delay_present</a><span>, in § 2.3.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#marker">marker</a><span>, in § 2.3.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#metadata_specific_parameters">metadata_specific_parameters</a><span>, in § 2.8.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#metadata_type">metadata_type</a><span>, in § 2.8.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#monochrome">monochrome</a><span>, in § 2.3.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#seq_level_idx_0">seq_level_idx_0</a><span>, in § 2.3.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#seq_profile">seq_profile</a><span>, in § 2.3.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#seq_tier_0">seq_tier_0</a><span>, in § 2.3.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#twelve_bit">twelve_bit</a><span>, in § 2.3.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#version">version</a><span>, in § 2.3.4</span>
+   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#width">width</a><span>, in § 2.2.4</span>
+  </li></ul>
+  <aside class="dfn-panel" data-for="term-for-page=1">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=1">1. Bitstream features overview</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=1%E2%91%A0">2. Basic Encapsulation Scheme</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=2">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=44">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=44">2.3.4. Semantics</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=206">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A3">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A4">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A5">(7)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A6">2.4. AV1 Sample Format</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A7">2.5.2. Description</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A8">(2)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A0%E2%93%AA">2.5.4. Semantics</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=49">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=49">2.3.4. Semantics</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=49%E2%91%A0">2.4. AV1 Sample Format</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=49%E2%91%A1">4.1. General Subsample Encryption constraints</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=71">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A3">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A4">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A5">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A6">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A7">(9)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=2">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=2">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=13">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A3">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A4">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A5">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A6">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A7">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A8">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0%E2%93%AA">2.7.2. Description</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=13">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A3">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A4">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A5">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A6">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A7">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A8">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0%E2%93%AA">2.7.2. Description</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=13">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A3">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A4">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A5">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A6">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A7">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A8">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0%E2%93%AA">2.7.2. Description</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=206">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A3">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A4">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A5">(7)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A6">2.4. AV1 Sample Format</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A7">2.5.2. Description</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A8">(2)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A0%E2%93%AA">2.5.4. Semantics</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=39">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39">1. Bitstream features overview</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39%E2%91%A0">2.3.4. Semantics</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39%E2%91%A1">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39%E2%91%A2">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=2">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=2">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=46">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A0">(2)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A1">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A2">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A3">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A4">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A5">2.8.2. Description</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A6">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A7">(3)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A8">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A0%E2%93%AA">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=2">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=39">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39">1. Bitstream features overview</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39%E2%91%A0">2.3.4. Semantics</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39%E2%91%A1">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39%E2%91%A2">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=40">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=40">2.3.4. Semantics</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=40%E2%91%A0">4.1. General Subsample Encryption constraints</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=2">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=2">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=2">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=121">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121">1. Bitstream features overview</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121%E2%91%A0">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121%E2%91%A1">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=206">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A3">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A4">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A5">(7)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A6">2.4. AV1 Sample Format</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A7">2.5.2. Description</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A8">(2)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A0%E2%93%AA">2.5.4. Semantics</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=121">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121">1. Bitstream features overview</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121%E2%91%A0">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121%E2%91%A1">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=2">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=2">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=41">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0">(2)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A2">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A3">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A4">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A5">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A6">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A7">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A8">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%93%AA">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A0">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A1">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A2">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A3">(13)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A4">(14)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A5">(15)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A6">(16)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A7">(17)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A8">(18)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%93%AA">(19)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A0">(20)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A1">(21)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A2">(22)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A3">(23)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A4">(24)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A5">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A6">(2)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A7">4.1. General Subsample Encryption constraints</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A8">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A2%E2%93%AA">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A2%E2%91%A0">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A2%E2%91%A1">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A2%E2%91%A2">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A2%E2%91%A3">(6)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=2">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=2">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=2">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=2">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=13">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A3">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A4">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A5">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A6">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A7">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A8">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0%E2%93%AA">2.7.2. Description</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=46">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A0">(2)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A1">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A2">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A3">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A4">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A5">2.8.2. Description</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A6">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A7">(3)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A8">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A0%E2%93%AA">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=13">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A3">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A4">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A5">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A6">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A7">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A8">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0%E2%93%AA">2.7.2. Description</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=71">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A3">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A4">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A5">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A6">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A7">(9)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=121">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121">1. Bitstream features overview</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121%E2%91%A0">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121%E2%91%A1">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=45">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=45">2.3.4. Semantics</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-page=2">
+   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-">
+   <a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4. Common Encryption</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(12)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-">
+   <a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4. Common Encryption</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(12)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-">
+   <a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4. Common Encryption</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(12)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-">
+   <a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4. Common Encryption</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(12)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-">
+   <a href="https://www.iso.org/standard/71975.html#">https://www.iso.org/standard/71975.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">3. CMAF AV1 track format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-">
+   <a href="https://www.iso.org/standard/71975.html#">https://www.iso.org/standard/71975.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">3. CMAF AV1 track format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-">
+   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-">
+   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-">
+   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-">
+   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-">
+   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-">
+   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-">
+   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-">
+   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-">
+   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-">
+   <a href="https://tools.ietf.org/html/rfc6381#">https://tools.ietf.org/html/rfc6381#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">5. Codecs Parameter String</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-">
+   <a href="https://www.webmproject.org/vp9/mp4/#">https://www.webmproject.org/vp9/mp4/#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="term-for-">
+   <a href="https://www.webmproject.org/vp9/mp4/#">https://www.webmproject.org/vp9/mp4/#</a><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
+   </li></ul>
+  </aside>
+  <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span class="content">Terms defined by reference</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#index-defined-elsewhere"></a></h3>
+  <ul class="index">
+   <li>
+    <a data-link-type="biblio">[AV1]</a> defines the following terms:
+    <ul>
+     <li><span class="dfn-paneled" id="term-for-page=1">av1 bitstream</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=2">buffer_removal_time</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=44">color_config</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=206">delayed random access point</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=49">frame header obu</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=71">frame obu</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=2①">frame_presentation_time</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=2②">initial_display_delay_minus_1</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=13">inter frame</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=13①">intra-only frame</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=13②">key frame</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=206①">key frame dependent recovery point</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=39">low overhead bitstream format</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=2③">max_frame_height_minus_1</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=2④">max_frame_width_minus_1</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=46">metadata obu</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=2⑤">mono_chrome</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=39①">obu</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=40">obu header</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=2⑥">obu_has_size_field</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=2⑦">obu_size</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=2⑧">open_bitstream_unit</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=121">padding obu</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=206②">random access point</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=121①">redundant frame header obu</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=2⑨">seq_level_idx</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=2①⓪">seq_tier</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=41">sequence header obu</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=2①①">show_existing_frame</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=2①②">show_frame</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=2①③">subsampling_x</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=2①④">subsampling_y</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=13③">switch frame</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=46①">temporal delimiter obu</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=13④">temporal unit</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=71①">tile group obu</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=121②">tile list obu</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=45">timing_info</span>
+     </li><li><span class="dfn-paneled" id="term-for-page=2①⑤">timing_info_present_flag</span>
+    </li></ul>
+   </li><li>
+    <a data-link-type="biblio">[CENC]</a> defines the following terms:
+    <ul>
+     <li><span class="dfn-paneled" id="term-for-">bytesofcleardata</span>
+     </li><li><span class="dfn-paneled" id="term-for-①">bytesofprotecteddata</span>
+     </li><li><span class="dfn-paneled" id="term-for-②">cbcs</span>
+     </li><li><span class="dfn-paneled" id="term-for-③">cenc</span>
+    </li></ul>
+   </li><li>
+    <a data-link-type="biblio">[CMAF]</a> defines the following terms:
+    <ul>
+     <li><span class="dfn-paneled" id="term-for-④">cmaf video track</span>
+     </li><li><span class="dfn-paneled" id="term-for-⑤">cmfc</span>
+    </li></ul>
+   </li><li>
+    <a data-link-type="biblio">[ISOBMFF]</a> defines the following terms:
+    <ul>
+     <li><span class="dfn-paneled" id="term-for-⑥">bitr</span>
+     </li><li><span class="dfn-paneled" id="term-for-⑦">clap</span>
+     </li><li><span class="dfn-paneled" id="term-for-⑧">clli</span>
+     </li><li><span class="dfn-paneled" id="term-for-⑨">colr</span>
+     </li><li><span class="dfn-paneled" id="term-for-①⓪">ctts</span>
+     </li><li><span class="dfn-paneled" id="term-for-①①">iso6</span>
+     </li><li><span class="dfn-paneled" id="term-for-①②">mdcv</span>
+     </li><li><span class="dfn-paneled" id="term-for-①③">nclx</span>
+     </li><li><span class="dfn-paneled" id="term-for-①④">visualsampleentry</span>
+    </li></ul>
+   </li><li>
+    <a data-link-type="biblio">[RFC6381]</a> defines the following terms:
+    <ul>
+     <li><span class="dfn-paneled" id="term-for-①⑤">codecs</span>
+    </li></ul>
+   </li><li>
+    <a data-link-type="biblio">[vp9]</a> defines the following terms:
+    <ul>
+     <li><span class="dfn-paneled" id="term-for-①⑥">coll</span>
+     </li><li><span class="dfn-paneled" id="term-for-①⑦">smdm</span>
+    </li></ul>
+  </li></ul>
+  <h2 class="no-num no-ref heading settled" id="references"><span class="content">References</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#references"></a></h2>
+  <h3 class="no-num no-ref heading settled" id="normative"><span class="content">Normative References</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#normative"></a></h3>
+  <dl>
+   <dt id="biblio-av1">[AV1]
+   </dt><dd><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf"><cite>AV1 Bitstream &amp; Decoding Process Specification</cite></a>. Standard. URL: <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf">https://aomediacodec.github.io/av1-spec/av1-spec.pdf</a>
+   </dd><dt id="biblio-cenc">[CENC]
+   </dt><dd><a href="https://www.iso.org/standard/68042.html"><cite>Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files</cite></a>. Standard. URL: <a href="https://www.iso.org/standard/68042.html">https://www.iso.org/standard/68042.html</a>
+   </dd><dt id="biblio-cmaf">[CMAF]
+   </dt><dd><a href="https://www.iso.org/standard/71975.html"><cite>Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media</cite></a>. Standard. URL: <a href="https://www.iso.org/standard/71975.html">https://www.iso.org/standard/71975.html</a>
+   </dd><dt id="biblio-isobmff">[ISOBMFF]
+   </dt><dd><a href="http://standards.iso.org/ittf/PubliclyAvailableStandards/c068960_ISO_IEC_14496-12_2015.zip"><cite>Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format</cite></a>. December 2015. International Standard. URL: <a href="http://standards.iso.org/ittf/PubliclyAvailableStandards/c068960_ISO_IEC_14496-12_2015.zip">http://standards.iso.org/ittf/PubliclyAvailableStandards/c068960_ISO_IEC_14496-12_2015.zip</a>
+   </dd><dt id="biblio-rfc2119">[RFC2119]
+   </dt><dd>S. Bradner. <a href="https://datatracker.ietf.org/doc/html/rfc2119"><cite>Key words for use in RFCs to Indicate Requirement Levels</cite></a>. March 1997. Best Current Practice. URL: <a href="https://datatracker.ietf.org/doc/html/rfc2119">https://datatracker.ietf.org/doc/html/rfc2119</a>
+   </dd><dt id="biblio-rfc6381">[RFC6381]
+   </dt><dd>R. Gellens; D. Singer; P. Frojdh. <a href="https://www.rfc-editor.org/rfc/rfc6381"><cite>The 'Codecs' and 'Profiles' Parameters for "Bucket" Media Types</cite></a>. August 2011. Proposed Standard. URL: <a href="https://www.rfc-editor.org/rfc/rfc6381">https://www.rfc-editor.org/rfc/rfc6381</a>
+  </dd></dl>
+  <aside class="dfn-panel" data-for="av1sampleentry">
+   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry">#av1sampleentry</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1sampleentry">2.1. General Requirements &amp; Brands</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1sampleentry%E2%91%A0">2.2.4. Semantics</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1sampleentry%E2%91%A1">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1sampleentry%E2%91%A2">(2)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1sampleentry%E2%91%A3">3. CMAF AV1 track format</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="av1codecconfigurationbox">
+   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox">#av1codecconfigurationbox</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1codecconfigurationbox">2.2.2. Description</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1codecconfigurationbox%E2%91%A0">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1codecconfigurationbox%E2%91%A1">(2)</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1codecconfigurationbox%E2%91%A2">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1codecconfigurationbox%E2%91%A3">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1codecconfigurationbox%E2%91%A4">(3)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="high_bitdepth">
+   <b><a href="https://aomediacodec.github.io/av1-isobmff/#high_bitdepth">#high_bitdepth</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-high_bitdepth">2.3.4. Semantics</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="twelve_bit">
+   <b><a href="https://aomediacodec.github.io/av1-isobmff/#twelve_bit">#twelve_bit</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-twelve_bit">2.3.4. Semantics</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="chroma_subsampling_x">
+   <b><a href="https://aomediacodec.github.io/av1-isobmff/#chroma_subsampling_x">#chroma_subsampling_x</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-chroma_subsampling_x">2.3.4. Semantics</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="chroma_subsampling_y">
+   <b><a href="https://aomediacodec.github.io/av1-isobmff/#chroma_subsampling_y">#chroma_subsampling_y</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-chroma_subsampling_y">2.3.4. Semantics</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="chroma_sample_position">
+   <b><a href="https://aomediacodec.github.io/av1-isobmff/#chroma_sample_position">#chroma_sample_position</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-chroma_sample_position">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-chroma_sample_position%E2%91%A0">(2)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="initial_presentation_delay_minus_one">
+   <b><a href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_minus_one">#initial_presentation_delay_minus_one</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-initial_presentation_delay_minus_one">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-initial_presentation_delay_minus_one%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-initial_presentation_delay_minus_one%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-initial_presentation_delay_minus_one%E2%91%A2">(4)</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="av1-sample">
+   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1-sample">#av1-sample</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1-sample">2.2.2. Description</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="av1forwardkeyframesamplegroupentry">
+   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1forwardkeyframesamplegroupentry">#av1forwardkeyframesamplegroupentry</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1forwardkeyframesamplegroupentry">2.3.4. Semantics</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1forwardkeyframesamplegroupentry%E2%91%A0">2.4. AV1 Sample Format</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="av1multiframesamplegroupentry">
+   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1multiframesamplegroupentry">#av1multiframesamplegroupentry</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1multiframesamplegroupentry">2.4. AV1 Sample Format</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="av1s">
+   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1s">#av1s</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1s">2.4. AV1 Sample Format</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="av1switchframesamplegroupentry">
+   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1switchframesamplegroupentry">#av1switchframesamplegroupentry</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1switchframesamplegroupentry">2.4. AV1 Sample Format</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="av1metadatasamplegroupentry">
+   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1metadatasamplegroupentry">#av1metadatasamplegroupentry</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1metadatasamplegroupentry">2.4. AV1 Sample Format</a>
+   </li></ul>
+  </aside>
+  <aside class="dfn-panel" data-for="cmaf-av1-track">
+   <b><a href="https://aomediacodec.github.io/av1-isobmff/#cmaf-av1-track">#cmaf-av1-track</a></b><b>Referenced in:</b>
+   <ul>
+    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-cmaf-av1-track">3. CMAF AV1 track format</a>
+    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-cmaf-av1-track%E2%91%A0">4. Common Encryption</a>
+   </li></ul>
+  </aside>
+<script>/* script-dfn-panel */
+
+document.body.addEventListener("click", function(e) {
+    var queryAll = function(sel) { return [].slice.call(document.querySelectorAll(sel)); }
+    // Find the dfn element or panel, if any, that was clicked on.
+    var el = e.target;
+    var target;
+    var hitALink = false;
+    while(el.parentElement) {
+        if(el.tagName == "A") {
+            // Clicking on a link in a <dfn> shouldn't summon the panel
+            hitALink = true;
+        }
+        if(el.classList.contains("dfn-paneled")) {
+            target = "dfn";
+            break;
+        }
+        if(el.classList.contains("dfn-panel")) {
+            target = "dfn-panel";
+            break;
+        }
+        el = el.parentElement;
+    }
+    if(target != "dfn-panel") {
+        // Turn off any currently "on" or "activated" panels.
+        queryAll(".dfn-panel.on, .dfn-panel.activated").forEach(function(el){
+            el.classList.remove("on");
+            el.classList.remove("activated");
+        });
+    }
+    if(target == "dfn" && !hitALink) {
+        // open the panel
+        var dfnPanel = document.querySelector(".dfn-panel[data-for='" + el.id + "']");
+        if(dfnPanel) {
+            dfnPanel.classList.add("on");
+            var rect = el.getBoundingClientRect();
+            dfnPanel.style.left = window.scrollX + rect.right + 5 + "px";
+            dfnPanel.style.top = window.scrollY + rect.top + "px";
+            var panelRect = dfnPanel.getBoundingClientRect();
+            var panelWidth = panelRect.right - panelRect.left;
+            if(panelRect.right > document.body.scrollWidth && (rect.left - (panelWidth + 5)) > 0) {
+                // Reposition, because the panel is overflowing
+                dfnPanel.style.left = window.scrollX + rect.left - (panelWidth + 5) + "px";
+            }
+        } else {
+            console.log("Couldn't find .dfn-panel[data-for='" + el.id + "']");
+        }
+    } else if(target == "dfn-panel") {
+        // Switch it to "activated" state, which pins it.
+        el.classList.add("activated");
+        el.style.left = null;
+        el.style.top = null;
+    }
+
+});
+</script></body></html>
\ No newline at end of file

From 2ab9864aabbcd55c4889c90858cc1fa8a8b78322 Mon Sep 17 00:00:00 2001
From: Dimitri Podborski <podborski@users.noreply.github.com>
Date: Tue, 3 Oct 2023 00:24:36 -0700
Subject: [PATCH 07/12] make assert id's unique for v120

---
 index_120.bs | 28 ++++++++++++++--------------
 v1.2.0.html  | 30 +++++++++++++++---------------
 2 files changed, 29 insertions(+), 29 deletions(-)

diff --git a/index_120.bs b/index_120.bs
index a926ccd..3d2ec6b 100644
--- a/index_120.bs
+++ b/index_120.bs
@@ -198,8 +198,8 @@ AV1 Sample Entry {#av1sampleentry-section}
 <pre class="def">
 	Sample Entry Type: <dfn value export for="AV1SampleEntry">av01</dfn>
 	Container:         Sample Description Box ('stsd')
-	Mandatory:         <assert>Yes</assert>
-	Quantity:          <assert>One or more.</assert>
+	<assert>Mandatory:         Yes <p hidden>for av01</p></assert>
+	<assert>Quantity:          One or more <p hidden>for av01</p></assert>
 </pre>
 
 ### Description ### {#av1sampleentry-description}
@@ -243,8 +243,8 @@ AV1 Codec Configuration Box {#av1codecconfigurationbox-section}
 <pre class="def">
 	Box Type:  <dfn export>av1C</dfn>
 	Container: AV1 Sample Entry ('av01')
-	Mandatory: <assert>Yes</assert>
-	Quantity:  <assert>Exactly One</assert>
+	<assert>Mandatory: Yes <p hidden>for av1C</p></assert>
+	<assert>Quantity:  Exactly One <p hidden>for av1C</p></assert>
 </pre>
 
 
@@ -411,8 +411,8 @@ AV1 Forward Key Frame sample group entry {#forwardkeyframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn export>av1f</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	Mandatory:  <assert>No</assert>
-	Quantity:   <assert>Zero or more</assert>.
+	<assert>Mandatory:  No <p hidden>for av1f</p></assert>
+	<assert>Quantity:   Zero or more <p hidden>for av1f</p></assert>.
 </pre>
 
 ### Description ### {#forwardkeyframesamplegroupentry-description}
@@ -440,8 +440,8 @@ AV1 Multi-Frame sample group entry {#multiframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn value export for="AV1MultiFrameSampleGroupEntry">av1m</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	Mandatory:  <assert>No</assert>
-	Quantity:   <assert>Zero or more</assert>.
+	<assert>Mandatory:  No <p hidden>for av1m</p></assert>
+	<assert>Quantity:   Zero or more <p hidden>for av1m</p></assert>.
 </pre>
 
 
@@ -465,8 +465,8 @@ AV1 Switch Frame sample group entry {#switchframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn export>av1s</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	Mandatory:  <assert>No</assert>
-	Quantity:   <assert>Zero or more</assert>.
+	<assert>Mandatory:  No <p hidden>for av1s</p></assert>
+	<assert>Quantity:   Zero or more <p hidden>for av1s</p></assert>.
 </pre>
 
 
@@ -489,8 +489,8 @@ AV1 Metadata sample group entry {#metadatasamplegroupentry}
 <pre class="def">
 	Group Type: <dfn value noexport for="AV1MetadataSampleGroupEntry">av1M</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	Mandatory:  <assert>No</assert>
-	Quantity:   <assert>Zero or more</assert>.
+	<assert>Mandatory:  No <p hidden>for av1M</p></assert>
+	<assert>Quantity:   Zero or more <p hidden>for av1M</p></assert>.
 </pre>
 
 
@@ -568,7 +568,7 @@ Within protected samples, the following constraints apply:
 	    NOTE: As a result of the above, [=BytesOfProtectedData=] is not necessarily a multiple of 16 bytes and partial blocks are included in the [=BytesOfProtectedData=] range, but per [[!CENC]] the data is not be encrypted.
 
 	    - <assert>A subsample SHALL be created for each tile, even if its size is less than 16 bytes</assert>.
-		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected</assert>.
+		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <p hidden>for cbcs</p></assert>.
 
 	- for the protected scheme <code>[=cenc=]</code>:
 	    - <assert>[=BytesOfProtectedData=] SHALL be a multiple of 16 bytes</assert>.
@@ -577,7 +577,7 @@ Within protected samples, the following constraints apply:
 
 	    NOTE: As a result of the above, partial blocks are not used and it is possible that [=BytesOfProtectedData=] does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.
 	    - <assert>A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes</assert>. <assert>If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the [=BytesOfClearData=] field of a surrounding subsample, if any</assert>.
-		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected</assert>.
+		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <p hidden>for cenc</p></assert>.
 
 Subsample Encryption Illustration {#subsample-encryption-illustration}
 ------------------
diff --git a/v1.2.0.html b/v1.2.0.html
index f3f054c..cf82809 100644
--- a/v1.2.0.html
+++ b/v1.2.0.html
@@ -1490,7 +1490,7 @@
 </style>
   <meta content="Bikeshed version d9bd89757, updated Thu Mar 23 10:06:53 2023 -0700" name="generator">
   <link href="https://aomediacodec.github.io/av1-isobmff/" rel="canonical">
-  <meta content="61b1746fa5bbc0b94100eab194bef5961db1c4b6" name="document-revision">
+  <meta content="3cf8fa801665d96b5564cef8ec515ebba4a2c50c" name="document-revision">
 <style>/* style-autolinks */
 .css.css, .property.property, .descriptor.descriptor {
     color: var(--a-normal-text);
@@ -2078,8 +2078,8 @@ <h3 class="heading settled" data-level="2.2" id="av1sampleentry-section"><span c
    <h4 class="heading settled" data-level="2.2.1" id="av1sampleentry-definition"><span class="secno">2.2.1. </span><span class="content">Definition</span><a class="self-link" href="#av1sampleentry-definition"></a></h4>
 <pre class="def">Sample Entry Type: <dfn data-dfn-for="AV1SampleEntry" data-dfn-type="value" data-export id="valdef-av1sampleentry-av01">av01<a class="self-link" href="#valdef-av1sampleentry-av01"></a></dfn>
 Container:         Sample Description Box ('stsd')
-Mandatory:         <span id="assert-93cba074">Yes</span>
-Quantity:          <span id="assert-17ecb535">One or more.</span>
+<span id="assert-485d25aa">Mandatory:         Yes <p hidden>for av01</p></span>
+<span id="assert-e091fa3c">Quantity:          One or more <p hidden>for av01</p></span>
 </pre>
    <h4 class="heading settled" data-level="2.2.2" id="av1sampleentry-description"><span class="secno">2.2.2. </span><span class="content">Description</span><a class="self-link" href="#av1sampleentry-description"></a></h4>
    <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1sampleentry">AV1SampleEntry</dfn> sample entry identifies that the track contains <a data-link-type="dfn" href="#av1-sample" id="ref-for-av1-sample">AV1 Samples</a>, and uses an <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox">AV1CodecConfigurationBox</a>.</p>
@@ -2102,8 +2102,8 @@ <h3 class="heading settled" data-level="2.3" id="av1codecconfigurationbox-sectio
    <h4 class="heading settled" data-level="2.3.1" id="av1codecconfigurationbox-definition"><span class="secno">2.3.1. </span><span class="content">Definition</span><a class="self-link" href="#av1codecconfigurationbox-definition"></a></h4>
 <pre class="def">Box Type:  <dfn data-dfn-type="dfn" data-export id="av1c">av1C<a class="self-link" href="#av1c"></a></dfn>
 Container: AV1 Sample Entry ('av01')
-Mandatory: <span id="assert-93cba074">Yes</span>
-Quantity:  <span id="assert-29c02c41">Exactly One</span>
+<span id="assert-318390e9">Mandatory: Yes <p hidden>for av1C</p></span>
+<span id="assert-a249db05">Quantity:  Exactly One <p hidden>for av1C</p></span>
 </pre>
    <h4 class="heading settled" data-level="2.3.2" id="av1codecconfigurationbox-description"><span class="secno">2.3.2. </span><span class="content">Description</span><a class="self-link" href="#av1codecconfigurationbox-description"></a></h4>
     <span id="assert-f875c695">The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1codecconfigurationbox">AV1CodecConfigurationBox</dfn> contains decoder configuration information that SHALL be valid for every sample that references the sample entry.</span> 
@@ -2218,8 +2218,8 @@ <h3 class="heading settled" data-level="2.5" id="forwardkeyframesamplegroupentry
    <h4 class="heading settled" data-level="2.5.1" id="forwardkeyframesamplegroupentry-definition"><span class="secno">2.5.1. </span><span class="content">Definition</span><a class="self-link" href="#forwardkeyframesamplegroupentry-definition"></a></h4>
 <pre class="def">Group Type: <dfn data-dfn-type="dfn" data-export id="av1f">av1f<a class="self-link" href="#av1f"></a></dfn>
 Container:  Sample Group Description Box ('sgpd')
-Mandatory:  <span id="assert-bafd7322">No</span>
-Quantity:   <span id="assert-5c97b843">Zero or more</span>.
+<span id="assert-b19a22ce">Mandatory:  No <p hidden>for av1f</p></span>
+<span id="assert-6de7aff7">Quantity:   Zero or more <p hidden>for av1f</p></span>.
 </pre>
    <h4 class="heading settled" data-level="2.5.2" id="forwardkeyframesamplegroupentry-description"><span class="secno">2.5.2. </span><span class="content">Description</span><a class="self-link" href="#forwardkeyframesamplegroupentry-description"></a></h4>
    <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</dfn> documents samples that contain a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑧">Delayed Random Access Point</a> that are followed at a given distance in the bitstream by a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑨">Key Frame Dependent Recovery Point</a>.</p>
@@ -2234,8 +2234,8 @@ <h3 class="heading settled" data-level="2.6" id="multiframesamplegroupentry"><sp
    <h4 class="heading settled" data-level="2.6.1" id="multiframesamplegroupentry-definition"><span class="secno">2.6.1. </span><span class="content">Definition</span><a class="self-link" href="#multiframesamplegroupentry-definition"></a></h4>
 <pre class="def">Group Type: <dfn data-dfn-for="AV1MultiFrameSampleGroupEntry" data-dfn-type="value" data-export id="valdef-av1multiframesamplegroupentry-av1m">av1m<a class="self-link" href="#valdef-av1multiframesamplegroupentry-av1m"></a></dfn>
 Container:  Sample Group Description Box ('sgpd')
-Mandatory:  <span id="assert-bafd7322">No</span>
-Quantity:   <span id="assert-5c97b843">Zero or more</span>.
+<span id="assert-5482ba80">Mandatory:  No <p hidden>for av1m</p></span>
+<span id="assert-35d7f2e6">Quantity:   Zero or more <p hidden>for av1m</p></span>.
 </pre>
    <h4 class="heading settled" data-level="2.6.2" id="multiframesamplegroupentry-description"><span class="secno">2.6.2. </span><span class="content">Description</span><a class="self-link" href="#multiframesamplegroupentry-description"></a></h4>
    <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</dfn> documents samples that contain multiple frames.</p>
@@ -2247,8 +2247,8 @@ <h3 class="heading settled" data-level="2.7" id="switchframesamplegroupentry"><s
    <h4 class="heading settled" data-level="2.7.1" id="switchframesamplegroupentry-definition"><span class="secno">2.7.1. </span><span class="content">Definition</span><a class="self-link" href="#switchframesamplegroupentry-definition"></a></h4>
 <pre class="def">Group Type: <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="av1s">av1s</dfn>
 Container:  Sample Group Description Box ('sgpd')
-Mandatory:  <span id="assert-bafd7322">No</span>
-Quantity:   <span id="assert-5c97b843">Zero or more</span>.
+<span id="assert-72c62575">Mandatory:  No <p hidden>for av1s</p></span>
+<span id="assert-731712f5">Quantity:   Zero or more <p hidden>for av1s</p></span>.
 </pre>
    <h4 class="heading settled" data-level="2.7.2" id="switchframesamplegroupentry-description"><span class="secno">2.7.2. </span><span class="content">Description</span><a class="self-link" href="#switchframesamplegroupentry-description"></a></h4>
    <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</dfn> documents samples that start with a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13①⓪">Switch Frame</a>.</p>
@@ -2260,8 +2260,8 @@ <h3 class="heading settled" data-level="2.8" id="metadatasamplegroupentry"><span
    <h4 class="heading settled" data-level="2.8.1" id="metadatasamplegroupentry-definition"><span class="secno">2.8.1. </span><span class="content">Definition</span><a class="self-link" href="#metadatasamplegroupentry-definition"></a></h4>
 <pre class="def">Group Type: <dfn data-dfn-for="AV1MetadataSampleGroupEntry" data-dfn-type="value" data-noexport id="valdef-av1metadatasamplegroupentry-av1m">av1M<a class="self-link" href="#valdef-av1metadatasamplegroupentry-av1m"></a></dfn>
 Container:  Sample Group Description Box ('sgpd')
-Mandatory:  <span id="assert-bafd7322">No</span>
-Quantity:   <span id="assert-5c97b843">Zero or more</span>.
+<span id="assert-b6627aa5">Mandatory:  No <p hidden>for av1M</p></span>
+<span id="assert-fa0bc954">Quantity:   Zero or more <p hidden>for av1M</p></span>.
 </pre>
    <h4 class="heading settled" data-level="2.8.2" id="metadatasamplegroupentry-description"><span class="secno">2.8.2. </span><span class="content">Description</span><a class="self-link" href="#metadatasamplegroupentry-description"></a></h4>
    <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</dfn> documents samples that contain <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑥">metadata OBUs</a>. The <code>grouping_type_parameter</code> can be used to identify samples containing <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑦">metadata OBUs</a> of a given type. If no <code>grouping_type_parameter</code> is provided, the sample group entry identifies samples containing <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑧">metadata OBUs</a> for which the <code>metadata_type</code> is unknown.</p>
@@ -2331,7 +2331,7 @@ <h3 class="heading settled" data-level="4.1" id="subsample-encryption"><span cla
        <p class="note" role="note"><span class="marker">NOTE:</span> As a result of the above, <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑧">BytesOfProtectedData</a> is not necessarily a multiple of 16 bytes and partial blocks are included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑨">BytesOfProtectedData</a> range, but per <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a> the data is not be encrypted.</p>
        <ul>
         <li data-md><span id="assert-6547e5e3">A subsample SHALL be created for each tile, even if its size is less than 16 bytes</span>. 
-        <li data-md><span id="assert-606a0a3a">All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑤">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑥">Frame OBUs</a> SHALL be unprotected</span>. 
+        <li data-md><span id="assert-68939155">All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑤">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑥">Frame OBUs</a> SHALL be unprotected <p hidden>for cbcs</p></span>. 
        </ul>
       <li data-md>
        <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①⓪">cenc</a></code>:</p>
@@ -2343,7 +2343,7 @@ <h3 class="heading settled" data-level="4.1" id="subsample-encryption"><span cla
        <p class="note" role="note"><span class="marker">NOTE:</span> As a result of the above, partial blocks are not used and it is possible that <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①④">BytesOfProtectedData</a> does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.</p>
        <ul>
         <li data-md><span id="assert-df6aa49f">A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes</span>. <span id="assert-e145e592">If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①⑤">BytesOfClearData</a> field of a surrounding subsample, if any</span>. 
-        <li data-md><span id="assert-606a0a3a">All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑦">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑧">Frame OBUs</a> SHALL be unprotected</span>. 
+        <li data-md><span id="assert-f7394188">All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑦">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑧">Frame OBUs</a> SHALL be unprotected <p hidden>for cenc</p></span>. 
        </ul>
      </ul>
    </ul>

From 3d867e443685b5aa4345d8c9f5e64bd71fb7eb7d Mon Sep 17 00:00:00 2001
From: Dimitri Podborski <podborski@users.noreply.github.com>
Date: Mon, 27 Nov 2023 09:15:19 -0800
Subject: [PATCH 08/12] make assert-ids unique in the main bs file

---
 index.bs | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/index.bs b/index.bs
index ad32cd5..a299bcc 100644
--- a/index.bs
+++ b/index.bs
@@ -195,8 +195,8 @@ AV1 Sample Entry {#av1sampleentry-section}
 <pre class="def">
 	Sample Entry Type: <dfn value export for="AV1SampleEntry">av01</dfn>
 	Container:         Sample Description Box ('stsd')
-	Mandatory:         <assert>Yes</assert>
-	Quantity:          <assert>One or more.</assert>
+	<assert>Mandatory:         Yes <p hidden>for av01</p></assert>
+	<assert>Quantity:          One or more <p hidden>for av01</p></assert>
 </pre>
 
 ### Description ### {#av1sampleentry-description}
@@ -242,8 +242,8 @@ AV1 Codec Configuration Box {#av1codecconfigurationbox-section}
 <pre class="def">
 	Box Type:  <dfn export>av1C</dfn>
 	Container: AV1 Sample Entry ('av01')
-	Mandatory: <assert>Yes</assert>
-	Quantity:  <assert>Exactly One</assert>
+	<assert>Mandatory: Yes <p hidden>for av1C</p></assert>
+	<assert>Quantity:  Exactly One <p hidden>for av1C</p></assert>
 </pre>
 
 
@@ -412,8 +412,8 @@ AV1 Forward Key Frame sample group entry {#forwardkeyframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn export>av1f</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	Mandatory:  <assert>No</assert>
-	Quantity:   <assert>Zero or more</assert>.
+	<assert>Mandatory:  No <p hidden>for av1f</p></assert>
+	<assert>Quantity:   Zero or more <p hidden>for av1f</p></assert>.
 </pre>
 
 ### Description ### {#forwardkeyframesamplegroupentry-description}
@@ -441,8 +441,8 @@ AV1 Multi-Frame sample group entry {#multiframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn value export for="AV1MultiFrameSampleGroupEntry">av1m</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	Mandatory:  <assert>No</assert>
-	Quantity:   <assert>Zero or more</assert>.
+	<assert>Mandatory:  No <p hidden>for av1m</p></assert>
+	<assert>Quantity:   Zero or more <p hidden>for av1m</p></assert>.
 </pre>
 
 
@@ -466,8 +466,8 @@ AV1 Switch Frame sample group entry {#switchframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn export>av1s</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	Mandatory:  <assert>No</assert>
-	Quantity:   <assert>Zero or more</assert>.
+	<assert>Mandatory:  No <p hidden>for av1s</p></assert>
+	<assert>Quantity:   Zero or more <p hidden>for av1s</p></assert>.
 </pre>
 
 
@@ -490,8 +490,8 @@ AV1 Metadata sample group entry {#metadatasamplegroupentry}
 <pre class="def">
 	Group Type: <dfn value noexport for="AV1MetadataSampleGroupEntry">av1M</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	Mandatory:  <assert>No</assert>
-	Quantity:   <assert>Zero or more</assert>.
+	<assert>Mandatory:  No <p hidden>for av1M</p></assert>
+	<assert>Quantity:   Zero or more <p hidden>for av1M</p></assert>.
 </pre>
 
 
@@ -569,7 +569,7 @@ Within protected samples, the following constraints apply:
 	    NOTE: As a result of the above, [=BytesOfProtectedData=] is not necessarily a multiple of 16 bytes and partial blocks are included in the [=BytesOfProtectedData=] range, but per [[!CENC]] the data is not be encrypted.
 
 	    - <assert>A subsample SHALL be created for each tile, even if its size is less than 16 bytes</assert>.
-		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected</assert>.
+		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <p hidden>for cbcs</p></assert>.
 
 	- for the protected scheme <code>[=cenc=]</code>:
 	    - <assert>[=BytesOfProtectedData=] SHALL be a multiple of 16 bytes</assert>.
@@ -578,7 +578,7 @@ Within protected samples, the following constraints apply:
 
 	    NOTE: As a result of the above, partial blocks are not used and it is possible that [=BytesOfProtectedData=] does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.
 	    - <assert>A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes</assert>. <assert>If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the [=BytesOfClearData=] field of a surrounding subsample, if any</assert>.
-		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected</assert>.
+		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <p hidden>for cenc</p></assert>.
 
 Subsample Encryption Illustration {#subsample-encryption-illustration}
 ------------------

From 70de2437b1db361e6c883682eba91b52124bad37 Mon Sep 17 00:00:00 2001
From: Dimitri Podborski <podborski@users.noreply.github.com>
Date: Mon, 27 Nov 2023 09:17:47 -0800
Subject: [PATCH 09/12] use hidden span instead of p

---
 index.bs     |   28 +-
 index_120.bs |   28 +-
 v1.2.0.html  | 1707 ++++++++++++++++++++++++--------------------------
 3 files changed, 848 insertions(+), 915 deletions(-)

diff --git a/index.bs b/index.bs
index a299bcc..30e5d11 100644
--- a/index.bs
+++ b/index.bs
@@ -195,8 +195,8 @@ AV1 Sample Entry {#av1sampleentry-section}
 <pre class="def">
 	Sample Entry Type: <dfn value export for="AV1SampleEntry">av01</dfn>
 	Container:         Sample Description Box ('stsd')
-	<assert>Mandatory:         Yes <p hidden>for av01</p></assert>
-	<assert>Quantity:          One or more <p hidden>for av01</p></assert>
+	<assert>Mandatory:         Yes <span hidden>for av01</p></assert>
+	<assert>Quantity:          One or more <span hidden>for av01</p></assert>
 </pre>
 
 ### Description ### {#av1sampleentry-description}
@@ -242,8 +242,8 @@ AV1 Codec Configuration Box {#av1codecconfigurationbox-section}
 <pre class="def">
 	Box Type:  <dfn export>av1C</dfn>
 	Container: AV1 Sample Entry ('av01')
-	<assert>Mandatory: Yes <p hidden>for av1C</p></assert>
-	<assert>Quantity:  Exactly One <p hidden>for av1C</p></assert>
+	<assert>Mandatory: Yes <span hidden>for av1C</p></assert>
+	<assert>Quantity:  Exactly One <span hidden>for av1C</p></assert>
 </pre>
 
 
@@ -412,8 +412,8 @@ AV1 Forward Key Frame sample group entry {#forwardkeyframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn export>av1f</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <p hidden>for av1f</p></assert>
-	<assert>Quantity:   Zero or more <p hidden>for av1f</p></assert>.
+	<assert>Mandatory:  No <span hidden>for av1f</p></assert>
+	<assert>Quantity:   Zero or more <span hidden>for av1f</p></assert>.
 </pre>
 
 ### Description ### {#forwardkeyframesamplegroupentry-description}
@@ -441,8 +441,8 @@ AV1 Multi-Frame sample group entry {#multiframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn value export for="AV1MultiFrameSampleGroupEntry">av1m</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <p hidden>for av1m</p></assert>
-	<assert>Quantity:   Zero or more <p hidden>for av1m</p></assert>.
+	<assert>Mandatory:  No <span hidden>for av1m</p></assert>
+	<assert>Quantity:   Zero or more <span hidden>for av1m</p></assert>.
 </pre>
 
 
@@ -466,8 +466,8 @@ AV1 Switch Frame sample group entry {#switchframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn export>av1s</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <p hidden>for av1s</p></assert>
-	<assert>Quantity:   Zero or more <p hidden>for av1s</p></assert>.
+	<assert>Mandatory:  No <span hidden>for av1s</p></assert>
+	<assert>Quantity:   Zero or more <span hidden>for av1s</p></assert>.
 </pre>
 
 
@@ -490,8 +490,8 @@ AV1 Metadata sample group entry {#metadatasamplegroupentry}
 <pre class="def">
 	Group Type: <dfn value noexport for="AV1MetadataSampleGroupEntry">av1M</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <p hidden>for av1M</p></assert>
-	<assert>Quantity:   Zero or more <p hidden>for av1M</p></assert>.
+	<assert>Mandatory:  No <span hidden>for av1M</p></assert>
+	<assert>Quantity:   Zero or more <span hidden>for av1M</p></assert>.
 </pre>
 
 
@@ -569,7 +569,7 @@ Within protected samples, the following constraints apply:
 	    NOTE: As a result of the above, [=BytesOfProtectedData=] is not necessarily a multiple of 16 bytes and partial blocks are included in the [=BytesOfProtectedData=] range, but per [[!CENC]] the data is not be encrypted.
 
 	    - <assert>A subsample SHALL be created for each tile, even if its size is less than 16 bytes</assert>.
-		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <p hidden>for cbcs</p></assert>.
+		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <span hidden>for cbcs</p></assert>.
 
 	- for the protected scheme <code>[=cenc=]</code>:
 	    - <assert>[=BytesOfProtectedData=] SHALL be a multiple of 16 bytes</assert>.
@@ -578,7 +578,7 @@ Within protected samples, the following constraints apply:
 
 	    NOTE: As a result of the above, partial blocks are not used and it is possible that [=BytesOfProtectedData=] does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.
 	    - <assert>A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes</assert>. <assert>If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the [=BytesOfClearData=] field of a surrounding subsample, if any</assert>.
-		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <p hidden>for cenc</p></assert>.
+		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <span hidden>for cenc</p></assert>.
 
 Subsample Encryption Illustration {#subsample-encryption-illustration}
 ------------------
diff --git a/index_120.bs b/index_120.bs
index 3d2ec6b..55d8a90 100644
--- a/index_120.bs
+++ b/index_120.bs
@@ -198,8 +198,8 @@ AV1 Sample Entry {#av1sampleentry-section}
 <pre class="def">
 	Sample Entry Type: <dfn value export for="AV1SampleEntry">av01</dfn>
 	Container:         Sample Description Box ('stsd')
-	<assert>Mandatory:         Yes <p hidden>for av01</p></assert>
-	<assert>Quantity:          One or more <p hidden>for av01</p></assert>
+	<assert>Mandatory:         Yes <span hidden>for av01</p></assert>
+	<assert>Quantity:          One or more <span hidden>for av01</p></assert>
 </pre>
 
 ### Description ### {#av1sampleentry-description}
@@ -243,8 +243,8 @@ AV1 Codec Configuration Box {#av1codecconfigurationbox-section}
 <pre class="def">
 	Box Type:  <dfn export>av1C</dfn>
 	Container: AV1 Sample Entry ('av01')
-	<assert>Mandatory: Yes <p hidden>for av1C</p></assert>
-	<assert>Quantity:  Exactly One <p hidden>for av1C</p></assert>
+	<assert>Mandatory: Yes <span hidden>for av1C</p></assert>
+	<assert>Quantity:  Exactly One <span hidden>for av1C</p></assert>
 </pre>
 
 
@@ -411,8 +411,8 @@ AV1 Forward Key Frame sample group entry {#forwardkeyframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn export>av1f</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <p hidden>for av1f</p></assert>
-	<assert>Quantity:   Zero or more <p hidden>for av1f</p></assert>.
+	<assert>Mandatory:  No <span hidden>for av1f</p></assert>
+	<assert>Quantity:   Zero or more <span hidden>for av1f</p></assert>.
 </pre>
 
 ### Description ### {#forwardkeyframesamplegroupentry-description}
@@ -440,8 +440,8 @@ AV1 Multi-Frame sample group entry {#multiframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn value export for="AV1MultiFrameSampleGroupEntry">av1m</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <p hidden>for av1m</p></assert>
-	<assert>Quantity:   Zero or more <p hidden>for av1m</p></assert>.
+	<assert>Mandatory:  No <span hidden>for av1m</p></assert>
+	<assert>Quantity:   Zero or more <span hidden>for av1m</p></assert>.
 </pre>
 
 
@@ -465,8 +465,8 @@ AV1 Switch Frame sample group entry {#switchframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn export>av1s</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <p hidden>for av1s</p></assert>
-	<assert>Quantity:   Zero or more <p hidden>for av1s</p></assert>.
+	<assert>Mandatory:  No <span hidden>for av1s</p></assert>
+	<assert>Quantity:   Zero or more <span hidden>for av1s</p></assert>.
 </pre>
 
 
@@ -489,8 +489,8 @@ AV1 Metadata sample group entry {#metadatasamplegroupentry}
 <pre class="def">
 	Group Type: <dfn value noexport for="AV1MetadataSampleGroupEntry">av1M</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <p hidden>for av1M</p></assert>
-	<assert>Quantity:   Zero or more <p hidden>for av1M</p></assert>.
+	<assert>Mandatory:  No <span hidden>for av1M</p></assert>
+	<assert>Quantity:   Zero or more <span hidden>for av1M</p></assert>.
 </pre>
 
 
@@ -568,7 +568,7 @@ Within protected samples, the following constraints apply:
 	    NOTE: As a result of the above, [=BytesOfProtectedData=] is not necessarily a multiple of 16 bytes and partial blocks are included in the [=BytesOfProtectedData=] range, but per [[!CENC]] the data is not be encrypted.
 
 	    - <assert>A subsample SHALL be created for each tile, even if its size is less than 16 bytes</assert>.
-		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <p hidden>for cbcs</p></assert>.
+		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <span hidden>for cbcs</p></assert>.
 
 	- for the protected scheme <code>[=cenc=]</code>:
 	    - <assert>[=BytesOfProtectedData=] SHALL be a multiple of 16 bytes</assert>.
@@ -577,7 +577,7 @@ Within protected samples, the following constraints apply:
 
 	    NOTE: As a result of the above, partial blocks are not used and it is possible that [=BytesOfProtectedData=] does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.
 	    - <assert>A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes</assert>. <assert>If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the [=BytesOfClearData=] field of a surrounding subsample, if any</assert>.
-		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <p hidden>for cenc</p></assert>.
+		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <span hidden>for cenc</p></assert>.
 
 Subsample Encryption Illustration {#subsample-encryption-illustration}
 ------------------
diff --git a/v1.2.0.html b/v1.2.0.html
index cf82809..8caa2de 100644
--- a/v1.2.0.html
+++ b/v1.2.0.html
@@ -1488,10 +1488,10 @@
 		}
 	}
 </style>
-  <meta content="Bikeshed version d9bd89757, updated Thu Mar 23 10:06:53 2023 -0700" name="generator">
+  <meta content="Bikeshed version 82ce88815, updated Thu Sep 7 16:33:55 2023 -0700" name="generator">
   <link href="https://aomediacodec.github.io/av1-isobmff/" rel="canonical">
-  <meta content="3cf8fa801665d96b5564cef8ec515ebba4a2c50c" name="document-revision">
-<style>/* style-autolinks */
+  <meta content="3d867e443685b5aa4345d8c9f5e64bd71fb7eb7d" name="document-revision">
+<style>/* Boilerplate: style-autolinks */
 .css.css, .property.property, .descriptor.descriptor {
     color: var(--a-normal-text);
     font-size: inherit;
@@ -1552,8 +1552,16 @@
 [data-link-type=biblio] {
     white-space: pre;
 }
+
+@media (prefers-color-scheme: dark) {
+    :root {
+        --selflink-text: black;
+        --selflink-bg: silver;
+        --selflink-hover-text: white;
+    }
+}
 </style>
-<style>/* style-colors */
+<style>/* Boilerplate: style-colors */
 
 /* Any --*-text not paired with a --*-bg is assumed to have a transparent bg */
 :root {
@@ -1662,8 +1670,120 @@
 
     --editedrec-bg: darkorange;
 }
+
+@media (prefers-color-scheme: dark) {
+    :root {
+        --text: #ddd;
+        --bg: black;
+
+        --unofficial-watermark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='400' height='400'%3E%3Cg fill='%23100808' transform='translate(200 200) rotate(-45) translate(-200 -200)' stroke='%23100808' stroke-width='3'%3E%3Ctext x='50%25' y='220' style='font: bold 70px sans-serif; text-anchor: middle; letter-spacing: 6px;'%3EUNOFFICIAL%3C/text%3E%3Ctext x='50%25' y='305' style='font: bold 70px sans-serif; text-anchor: middle; letter-spacing: 6px;'%3EDRAFT%3C/text%3E%3C/g%3E%3C/svg%3E");
+
+        --logo-bg: #1a5e9a;
+        --logo-active-bg: #c00;
+        --logo-text: white;
+
+        --tocnav-normal-text: #999;
+        --tocnav-normal-bg: var(--bg);
+        --tocnav-hover-text: var(--tocnav-normal-text);
+        --tocnav-hover-bg: #080808;
+        --tocnav-active-text: #f44;
+        --tocnav-active-bg: var(--tocnav-normal-bg);
+
+        --tocsidebar-text: var(--text);
+        --tocsidebar-bg: #080808;
+        --tocsidebar-shadow: rgba(255,255,255,.1);
+        --tocsidebar-heading-text: hsla(203,20%,40%,.7);
+
+        --toclink-text: var(--text);
+        --toclink-underline: #6af;
+        --toclink-visited-text: var(--toclink-text);
+        --toclink-visited-underline: #054572;
+
+        --heading-text: #8af;
+
+        --hr-text: var(--text);
+
+        --algo-border: #456;
+
+        --del-text: #f44;
+        --del-bg: transparent;
+        --ins-text: #4a4;
+        --ins-bg: transparent;
+
+        --a-normal-text: #6af;
+        --a-normal-underline: #555;
+        --a-visited-text: var(--a-normal-text);
+        --a-visited-underline: var(--a-normal-underline);
+        --a-hover-bg: rgba(25%, 25%, 25%, .2);
+        --a-active-text: #f44;
+        --a-active-underline: var(--a-active-text);
+
+        --borderedblock-bg: rgba(255, 255, 255, .05);
+
+        --blockquote-border: silver;
+        --blockquote-bg: var(--borderedblock-bg);
+        --blockquote-text: currentcolor;
+
+        --issue-border: #e05252;
+        --issue-bg: var(--borderedblock-bg);
+        --issue-text: var(--text);
+        --issueheading-text: hsl(0deg, 70%, 70%);
+
+        --example-border: hsl(50deg, 90%, 60%);
+        --example-bg: var(--borderedblock-bg);
+        --example-text: var(--text);
+        --exampleheading-text: hsl(50deg, 70%, 70%);
+
+        --note-border: hsl(120deg, 100%, 35%);
+        --note-bg: var(--borderedblock-bg);
+        --note-text: var(--text);
+        --noteheading-text: hsl(120, 70%, 70%);
+        --notesummary-underline: silver;
+
+        --assertion-border: #444;
+        --assertion-bg: var(--borderedblock-bg);
+        --assertion-text: var(--text);
+
+        --advisement-border: orange;
+        --advisement-bg: #222218;
+        --advisement-text: var(--text);
+        --advisementheading-text: #f84;
+
+        --warning-border: red;
+        --warning-bg: hsla(40,100%,20%,0.95);
+        --warning-text: var(--text);
+
+        --amendment-border: #330099;
+        --amendment-bg: #080010;
+        --amendment-text: var(--text);
+        --amendmentheading-text: #cc00ff;
+
+        --def-border: #8ccbf2;
+        --def-bg: #080818;
+        --def-text: var(--text);
+        --defrow-border: #136;
+
+        --datacell-border: silver;
+
+        --indexinfo-text: #aaa;
+
+        --indextable-hover-text: var(--text);
+        --indextable-hover-bg: #181818;
+
+        --outdatedspec-bg: rgba(255, 255, 255, .5);
+        --outdatedspec-text: black;
+        --outdated-bg: maroon;
+        --outdated-text: white;
+        --outdated-shadow: red;
+
+        --editedrec-bg: darkorange;
+    }
+    /* In case a transparent-bg image doesn't expect to be on a dark bg,
+       which is quite common in practice... */
+    img { background: white; }
+}
 </style>
-<style>/* style-counters */
+<style>/* Boilerplate: style-counters */
 body {
     counter-reset: example figure issue;
 }
@@ -1692,17 +1812,75 @@
     content: "Figure " counter(figure) " ";
 }
 </style>
-<style>/* style-dfn-panel */
+<style>/* Boilerplate: style-dfn-panel */
+:root {
+    --dfnpanel-bg: #ddd;
+    --dfnpanel-text: var(--text);
+}
+@media (prefers-color-scheme: dark) {
+    :root {
+        --dfnpanel-bg: #222;
+        --dfnpanel-text: var(--text);
+    }
+}
+.dfn-panel {
+    position: absolute;
+    z-index: 35;
+    width: 20em;
+    width: 300px;
+    height: auto;
+    max-height: 500px;
+    overflow: auto;
+    padding: 0.5em 0.75em;
+    font: small Helvetica Neue, sans-serif, Droid Sans Fallback;
+    background: var(--dfnpanel-bg);
+    color: var(--dfnpanel-text);
+    border: outset 0.2em;
+    white-space: normal; /* in case it's moved into a pre */
+}
+.dfn-panel:not(.on) { display: none; }
+.dfn-panel * { margin: 0; padding: 0; text-indent: 0; }
+.dfn-panel > b { display: block; }
+.dfn-panel a { color: var(--dfnpanel-text); }
+.dfn-panel a:not(:hover) { text-decoration: none !important; border-bottom: none !important; }
+.dfn-panel > b + b { margin-top: 0.25em; }
+.dfn-panel ul { padding: 0 0 0 1em; list-style: none; }
+.dfn-panel li a {
+    white-space: pre;
+    display: inline-block;
+    max-width: calc(300px - 1.5em - 1em);
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+
+.dfn-panel.activated {
+    display: inline-block;
+    position: fixed;
+    left: .5em;
+    bottom: 2em;
+    margin: 0 auto;
+    max-width: calc(100vw - 1.5em - .4em - .5em);
+    max-height: 30vh;
+}
+
+.dfn-paneled[role="button"] { cursor: pointer; }
+</style>
+<style>/* Boilerplate: style-dfn-panel */
 :root {
     --dfnpanel-bg: #ddd;
     --dfnpanel-text: var(--text);
 }
+@media (prefers-color-scheme: dark) {
+    :root {
+        --dfnpanel-bg: #222;
+        --dfnpanel-text: var(--text);
+    }
+}
 .dfn-panel {
     position: absolute;
     z-index: 35;
     width: 20em;
-    min-width: min-content;
-    max-width: 300px;
+    width: 300px;
     height: auto;
     max-height: 500px;
     overflow: auto;
@@ -1719,8 +1897,15 @@
 .dfn-panel a { color: var(--dfnpanel-text); }
 .dfn-panel a:not(:hover) { text-decoration: none !important; border-bottom: none !important; }
 .dfn-panel > b + b { margin-top: 0.25em; }
-.dfn-panel ul { padding: 0; }
-.dfn-panel li { list-style: inside; }
+.dfn-panel ul { padding: 0 0 0 1em; list-style: none; }
+.dfn-panel li a {
+    white-space: pre;
+    display: inline-block;
+    max-width: calc(300px - 1.5em - 1em);
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+
 .dfn-panel.activated {
     display: inline-block;
     position: fixed;
@@ -1731,9 +1916,9 @@
     max-height: 30vh;
 }
 
-.dfn-paneled { cursor: pointer; }
+.dfn-paneled[role="button"] { cursor: pointer; }
 </style>
-<style>/* style-issues */
+<style>/* Boilerplate: style-issues */
 a[href].issue-return {
     float: right;
     float: inline-end;
@@ -1742,7 +1927,7 @@
     text-decoration: none;
 }
 </style>
-<style>/* style-md-lists */
+<style>/* Boilerplate: style-md-lists */
 /* This is a weird hack for me not yet following the commonmark spec
    regarding paragraph and lists. */
 [data-md] > :first-child {
@@ -1752,7 +1937,7 @@
     margin-bottom: 0;
 }
 </style>
-<style>/* style-selflinks */
+<style>/* Boilerplate: style-selflinks */
 
 :root {
     --selflink-text: white;
@@ -1801,145 +1986,16 @@
     font-style: normal;
     transition: opacity .2s, background-color .2s, color .2s;
 }
-dfn:hover > a.self-link {
-    opacity: 1;
-}
-dfn > a.self-link:hover {
-    color: var(--selflink-hover-text);
-}
-
-a.self-link::before            { content: "¶"; }
-.heading > a.self-link::before { content: "§"; }
-dfn > a.self-link::before      { content: "#"; }
-</style>
-<style>/* style-darkmode */
-
-@media (prefers-color-scheme: dark) {
-    :root {
-        --text: #ddd;
-        --bg: black;
-
-        --unofficial-watermark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='400' height='400'%3E%3Cg fill='%23100808' transform='translate(200 200) rotate(-45) translate(-200 -200)' stroke='%23100808' stroke-width='3'%3E%3Ctext x='50%25' y='220' style='font: bold 70px sans-serif; text-anchor: middle; letter-spacing: 6px;'%3EUNOFFICIAL%3C/text%3E%3Ctext x='50%25' y='305' style='font: bold 70px sans-serif; text-anchor: middle; letter-spacing: 6px;'%3EDRAFT%3C/text%3E%3C/g%3E%3C/svg%3E");
-
-        --logo-bg: #1a5e9a;
-        --logo-active-bg: #c00;
-        --logo-text: white;
-
-        --tocnav-normal-text: #999;
-        --tocnav-normal-bg: var(--bg);
-        --tocnav-hover-text: var(--tocnav-normal-text);
-        --tocnav-hover-bg: #080808;
-        --tocnav-active-text: #f44;
-        --tocnav-active-bg: var(--tocnav-normal-bg);
-
-        --tocsidebar-text: var(--text);
-        --tocsidebar-bg: #080808;
-        --tocsidebar-shadow: rgba(255,255,255,.1);
-        --tocsidebar-heading-text: hsla(203,20%,40%,.7);
-
-        --toclink-text: var(--text);
-        --toclink-underline: #6af;
-        --toclink-visited-text: var(--toclink-text);
-        --toclink-visited-underline: #054572;
-
-        --heading-text: #8af;
-
-        --hr-text: var(--text);
-
-        --algo-border: #456;
-
-        --del-text: #f44;
-        --del-bg: transparent;
-        --ins-text: #4a4;
-        --ins-bg: transparent;
-
-        --a-normal-text: #6af;
-        --a-normal-underline: #555;
-        --a-visited-text: var(--a-normal-text);
-        --a-visited-underline: var(--a-normal-underline);
-        --a-hover-bg: rgba(25%, 25%, 25%, .2);
-        --a-active-text: #f44;
-        --a-active-underline: var(--a-active-text);
-
-        --borderedblock-bg: rgba(255, 255, 255, .05);
-
-        --blockquote-border: silver;
-        --blockquote-bg: var(--borderedblock-bg);
-        --blockquote-text: currentcolor;
-
-        --issue-border: #e05252;
-        --issue-bg: var(--borderedblock-bg);
-        --issue-text: var(--text);
-        --issueheading-text: hsl(0deg, 70%, 70%);
-
-        --example-border: hsl(50deg, 90%, 60%);
-        --example-bg: var(--borderedblock-bg);
-        --example-text: var(--text);
-        --exampleheading-text: hsl(50deg, 70%, 70%);
-
-        --note-border: hsl(120deg, 100%, 35%);
-        --note-bg: var(--borderedblock-bg);
-        --note-text: var(--text);
-        --noteheading-text: hsl(120, 70%, 70%);
-        --notesummary-underline: silver;
-
-        --assertion-border: #444;
-        --assertion-bg: var(--borderedblock-bg);
-        --assertion-text: var(--text);
-
-        --advisement-border: orange;
-        --advisement-bg: #222218;
-        --advisement-text: var(--text);
-        --advisementheading-text: #f84;
-
-        --warning-border: red;
-        --warning-bg: hsla(40,100%,20%,0.95);
-        --warning-text: var(--text);
-
-        --amendment-border: #330099;
-        --amendment-bg: #080010;
-        --amendment-text: var(--text);
-        --amendmentheading-text: #cc00ff;
-
-        --def-border: #8ccbf2;
-        --def-bg: #080818;
-        --def-text: var(--text);
-        --defrow-border: #136;
-
-        --datacell-border: silver;
-
-        --indexinfo-text: #aaa;
-
-        --indextable-hover-text: var(--text);
-        --indextable-hover-bg: #181818;
-
-        --outdatedspec-bg: rgba(255, 255, 255, .5);
-        --outdatedspec-text: black;
-        --outdated-bg: maroon;
-        --outdated-text: white;
-        --outdated-shadow: red;
-
-        --editedrec-bg: darkorange;
-    }
-    /* In case a transparent-bg image doesn't expect to be on a dark bg,
-       which is quite common in practice... */
-    img { background: white; }
-}
-
-@media (prefers-color-scheme: dark) {
-    :root {
-        --selflink-text: black;
-        --selflink-bg: silver;
-        --selflink-hover-text: white;
-    }
-}
-
-@media (prefers-color-scheme: dark) {
-    :root {
-        --dfnpanel-bg: #222;
-        --dfnpanel-text: var(--text);
-    }
+dfn:hover > a.self-link {
+    opacity: 1;
 }
+dfn > a.self-link:hover {
+    color: var(--selflink-hover-text);
+}
+
+a.self-link::before            { content: "¶"; }
+.heading > a.self-link::before { content: "§"; }
+dfn > a.self-link::before      { content: "#"; }
 </style>
  <body class="h-entry">
   <div class="head">
@@ -2069,17 +2125,17 @@ <h3 class="heading settled" data-level="2.1" id="brands"><span class="secno">2.1
     <li data-md><span id="assert-3d78af2f">It SHALL conform to the normative requirements of <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a></span> 
     <li data-md><span id="assert-03258f22">It SHALL have the <dfn class="css" data-dfn-for="ISOBMFF Brand" data-dfn-type="value" data-export id="valdef-isobmff-brand-av01">av01<a class="self-link" href="#valdef-isobmff-brand-av01"></a></dfn> brand among the compatible brands array of the FileTypeBox</span> 
     <li data-md><span id="assert-0f24a9ee">It SHALL contain at least one track using an <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry">AV1SampleEntry</a></span> 
-    <li data-md><span id="assert-5e63f779">It SHOULD indicate a structural ISOBMFF brand among the compatible brands array of the FileTypeBox, such as <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006">iso6</a></span> 
+    <li data-md><span id="assert-5e63f779">It SHOULD indicate a structural ISOBMFF brand among the compatible brands array of the FileTypeBox, such as <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something">iso6</a></span> 
     <li data-md><span id="assert-c652c075">It MAY indicate CMAF brands as specified in <a href="#cmaf">§ 3 CMAF AV1 track format</a></span> 
     <li data-md><span id="assert-384c2374">It MAY indicate other brands not specified in this document provided that the associated requirements do not conflict with those given in this specification</span> 
    </ul>
-   <p>Parsers SHALL support the structures required by the <code><a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①">iso6</a></code> brand and MAY support structures required by further ISOBMFF structural brands.</p>
+   <p>Parsers SHALL support the structures required by the <code><a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①">iso6</a></code> brand and MAY support structures required by further ISOBMFF structural brands.</p>
    <h3 class="heading settled" data-level="2.2" id="av1sampleentry-section"><span class="secno">2.2. </span><span class="content">AV1 Sample Entry</span><a class="self-link" href="#av1sampleentry-section"></a></h3>
    <h4 class="heading settled" data-level="2.2.1" id="av1sampleentry-definition"><span class="secno">2.2.1. </span><span class="content">Definition</span><a class="self-link" href="#av1sampleentry-definition"></a></h4>
 <pre class="def">Sample Entry Type: <dfn data-dfn-for="AV1SampleEntry" data-dfn-type="value" data-export id="valdef-av1sampleentry-av01">av01<a class="self-link" href="#valdef-av1sampleentry-av01"></a></dfn>
 Container:         Sample Description Box ('stsd')
-<span id="assert-485d25aa">Mandatory:         Yes <p hidden>for av01</p></span>
-<span id="assert-e091fa3c">Quantity:          One or more <p hidden>for av01</p></span>
+<span id="assert-485d25aa">Mandatory:         Yes <span hidden>for av01<p></p></span></span>
+<span id="assert-e091fa3c">Quantity:          One or more <span hidden>for av01<p></p></span></span>
 </pre>
    <h4 class="heading settled" data-level="2.2.2" id="av1sampleentry-description"><span class="secno">2.2.2. </span><span class="content">Description</span><a class="self-link" href="#av1sampleentry-description"></a></h4>
    <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1sampleentry">AV1SampleEntry</dfn> sample entry identifies that the track contains <a data-link-type="dfn" href="#av1-sample" id="ref-for-av1-sample">AV1 Samples</a>, and uses an <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox">AV1CodecConfigurationBox</a>.</p>
@@ -2089,21 +2145,21 @@ <h4 class="heading settled" data-level="2.2.3" id="av1sampleentry-syntax"><span
 }
 </pre>
    <h4 class="heading settled" data-level="2.2.4" id="av1sampleentry-semantics"><span class="secno">2.2.4. </span><span class="content">Semantics</span><a class="self-link" href="#av1sampleentry-semantics"></a></h4>
-    <span id="assert-4708372f">The <dfn data-dfn-type="dfn" data-noexport id="width">width<a class="self-link" href="#width"></a></dfn> and <dfn data-dfn-type="dfn" data-noexport id="height">height<a class="self-link" href="#height"></a></dfn> fields of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006②">VisualSampleEntry</a> SHALL equal the values of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2④">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑤">max_frame_height_minus_1</a> + 1 of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41">Sequence Header OBU</a> applying to the samples associated with this sample entry.</span> <span id="assert-1624cff2">The width and height in the TrackHeaderBox SHOULD equal, respectively, the maximum RenderWidth, called MaxRenderWidth, and the maximum RenderHeight, called MaxRenderHeight, of all the frames associated with this sample entry.</span> <span id="assert-54ae6192">Additionally, if MaxRenderWidth and MaxRenderHeight values do not equal respectively the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑥">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑦">max_frame_height_minus_1</a> + 1 values of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①">Sequence Header OBU</a>, a PixelAspectRatioBox box SHALL be present in the sample entry and set such that</span> 
+    <span id="assert-4708372f">The <dfn data-dfn-type="dfn" data-noexport id="width">width<a class="self-link" href="#width"></a></dfn> and <dfn data-dfn-type="dfn" data-noexport id="height">height<a class="self-link" href="#height"></a></dfn> fields of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something②">VisualSampleEntry</a> SHALL equal the values of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2④">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑤">max_frame_height_minus_1</a> + 1 of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41">Sequence Header OBU</a> applying to the samples associated with this sample entry.</span> <span id="assert-1624cff2">The width and height in the TrackHeaderBox SHOULD equal, respectively, the maximum RenderWidth, called MaxRenderWidth, and the maximum RenderHeight, called MaxRenderHeight, of all the frames associated with this sample entry.</span> <span id="assert-54ae6192">Additionally, if MaxRenderWidth and MaxRenderHeight values do not equal respectively the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑥">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑦">max_frame_height_minus_1</a> + 1 values of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①">Sequence Header OBU</a>, a PixelAspectRatioBox box SHALL be present in the sample entry and set such that</span> 
 <pre>hSpacing / vSpacing = MaxRenderWidth * (max_frame_height_minus_1 + 1) /
                               ((max_frame_width_minus_1 + 1) * MaxRenderHeight)
 </pre>
-   <p>The <dfn data-dfn-type="dfn" data-noexport id="compressorname">compressorname<a class="self-link" href="#compressorname"></a></dfn> field of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006③">VisualSampleEntry</a> is an informative name. It is formatted in a fixed 32-byte field, with the first byte set to the number of bytes to be displayed, followed by that number of bytes of displayable data, followed by padding to complete 32 bytes total (including the size byte). <span id="assert-da9cc152">The value "\012AOM Coding" is RECOMMENDED</span>; the first byte is a count of the remaining bytes, here represented by \012, which (being octal 12) is decimal 10, the number of bytes in the rest of the string.</p>
+   <p>The <dfn data-dfn-type="dfn" data-noexport id="compressorname">compressorname<a class="self-link" href="#compressorname"></a></dfn> field of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something③">VisualSampleEntry</a> is an informative name. It is formatted in a fixed 32-byte field, with the first byte set to the number of bytes to be displayed, followed by that number of bytes of displayable data, followed by padding to complete 32 bytes total (including the size byte). <span id="assert-da9cc152">The value "\012AOM Coding" is RECOMMENDED</span>; the first byte is a count of the remaining bytes, here represented by \012, which (being octal 12) is decimal 10, the number of bytes in the rest of the string.</p>
    <p class="note" role="note"><span class="marker">NOTE:</span> Parsers may ignore the value of the compressorname field. It is specified in this document simply for legacy and backwards compatibility reasons.</p>
     <span id="assert-8d3f8e0c">The <dfn data-dfn-type="dfn" data-noexport id="config">config<a class="self-link" href="#config"></a></dfn> field SHALL contain an <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox①">AV1CodecConfigurationBox</a> that applies to the samples associated with this sample entry.</span> 
    <p class="note" role="note"><span class="marker">NOTE:</span> <span id="assert-8d7a614c">Multiple instances of <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry①">AV1SampleEntry</a> may be required when the track contains samples requiring a <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox②">AV1CodecConfigurationBox</a> with different characteristics.</span></p>
-    <span id="assert-d9e74d75">Optional boxes not specifically mentioned here can be present, in particular those indicated in the definition of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006④">VisualSampleEntry</a> in <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a>.</span> 
+    <span id="assert-d9e74d75">Optional boxes not specifically mentioned here can be present, in particular those indicated in the definition of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something④">VisualSampleEntry</a> in <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a>.</span> 
    <h3 class="heading settled" data-level="2.3" id="av1codecconfigurationbox-section"><span class="secno">2.3. </span><span class="content">AV1 Codec Configuration Box</span><a class="self-link" href="#av1codecconfigurationbox-section"></a></h3>
    <h4 class="heading settled" data-level="2.3.1" id="av1codecconfigurationbox-definition"><span class="secno">2.3.1. </span><span class="content">Definition</span><a class="self-link" href="#av1codecconfigurationbox-definition"></a></h4>
 <pre class="def">Box Type:  <dfn data-dfn-type="dfn" data-export id="av1c">av1C<a class="self-link" href="#av1c"></a></dfn>
 Container: AV1 Sample Entry ('av01')
-<span id="assert-318390e9">Mandatory: Yes <p hidden>for av1C</p></span>
-<span id="assert-a249db05">Quantity:  Exactly One <p hidden>for av1C</p></span>
+<span id="assert-318390e9">Mandatory: Yes <span hidden>for av1C<p></p></span></span>
+<span id="assert-a249db05">Quantity:  Exactly One <span hidden>for av1C<p></p></span></span>
 </pre>
    <h4 class="heading settled" data-level="2.3.2" id="av1codecconfigurationbox-description"><span class="secno">2.3.2. </span><span class="content">Description</span><a class="self-link" href="#av1codecconfigurationbox-description"></a></h4>
     <span id="assert-f875c695">The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1codecconfigurationbox">AV1CodecConfigurationBox</dfn> contains decoder configuration information that SHALL be valid for every sample that references the sample entry.</span> 
@@ -2166,14 +2222,14 @@ <h4 class="heading settled" data-level="2.3.4" id="av1codecconfigurationbox-sema
     <a class="self-link" href="#example-27bde372"></a> The difference between <a data-link-type="dfn" href="#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one①">initial_presentation_delay_minus_one</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①④">initial_display_delay_minus_1</a> can be illustrated by considering the following example: 
 <pre>a b c d e f g h
 </pre>
-    where letters correspond to frames. Assume that <code><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑤">initial_display_delay_minus_1</a></code> is 2, i.e. that once frame <code>c</code> has been decoded, all other frames in the bitstream can be presented on time. If those frames were grouped into temporal units and samples as follows: 
+    <p>where letters correspond to frames. Assume that <code><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑤">initial_display_delay_minus_1</a></code> is 2, i.e. that once frame <code>c</code> has been decoded, all other frames in the bitstream can be presented on time. If those frames were grouped into temporal units and samples as follows:</p>
 <pre>[a] [b c d] [e] [f] [g] [h]
 </pre>
-    <code><a data-link-type="dfn" href="#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one②">initial_presentation_delay_minus_one</a></code> would be 1 because it takes presentation of 2 samples to ensure that <code>c</code> is decoded.
-But if the frames were grouped as follows: 
+    <p><code><a data-link-type="dfn" href="#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one②">initial_presentation_delay_minus_one</a></code> would be 1 because it takes presentation of 2 samples to ensure that <code>c</code> is decoded.
+But if the frames were grouped as follows:</p>
 <pre>[a] [b] [c] [d e f] [g] [h]
 </pre>
-    <code><a data-link-type="dfn" href="#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one③">initial_presentation_delay_minus_one</a></code> would be 2 because it takes presentation of 3 samples to ensure that <code>c</code> is decoded. 
+    <p><code><a data-link-type="dfn" href="#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one③">initial_presentation_delay_minus_one</a></code> would be 2 because it takes presentation of 3 samples to ensure that <code>c</code> is decoded.</p>
    </div>
     <span id="assert-8890b1aa">The <dfn data-dfn-type="dfn" data-export id="configobus">configOBUs<a class="self-link" href="#configobus"></a></dfn> field contains zero or more OBUs</span>. Any OBU may be present provided that the following procedures produce compliant AV1 bitstreams: 
    <ul>
@@ -2185,10 +2241,10 @@ <h4 class="heading settled" data-level="2.3.4" id="av1codecconfigurationbox-sema
    <p>OBUs stored in the configOBUs field follow the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑥">open_bitstream_unit</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39①">Low Overhead Bitstream Format</a> syntax as specified in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a>. <span id="assert-cf9ef74c">The flag <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑦">obu_has_size_field</a> SHALL be set to 1, indicating that the size of the OBU payload follows the header, and that it is coded using LEB128</span>.</p>
     <span id="assert-745b4db3">When a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑨">Sequence Header OBU</a> is contained within the configOBUs of the AV1CodecConfigurationRecord, the values present in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⓪">Sequence Header OBU</a> contained within configOBUs SHALL match the values of the AV1CodecConfigurationRecord.</span> 
    <p>The presentation times of AV1 samples are given by the ISOBMFF structures. <span id="assert-551498bd">The <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑧">timing_info_present_flag</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②①">Sequence Header OBU</a> (in the configOBUs field or in the associated samples) SHOULD be set to 0</span>. <span id="assert-9be6e647">If set to 1, the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45" id="ref-for-page=45">timing_info</a> structure of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②②">Sequence Header OBU</a>, the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑨">frame_presentation_time</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⓪">buffer_removal_time</a> fields of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49">Frame Header OBUs</a>, if present, SHALL be ignored for the purpose of timed processing of the ISOBMFF file.</span></p>
-    <span id="assert-6056f4f8">The sample entry SHOULD contain a <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑤">colr</a> box with a colour_type set to <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑥">nclx</a></span>. <span id="assert-77d36bce">If present, the values of colour_primaries, transfer_characteristics, and matrix_coefficients SHALL match the values given in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②③">Sequence Header OBU</a> (in the configOBUs field or in the associated samples) if the color_description_present_flag is set to 1</span>. Similarly, <span id="assert-38597d4f">the full_range_flag in the <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑦">colr</a> box shall match the color_range flag in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②④">Sequence Header OBU</a>. When configOBUs does not contain a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑤">Sequence Header OBU</a>, this box with colour_type set to <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑧">nclx</a> SHALL be present.</span> <span id="assert-7eb8e932">The CleanApertureBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑨">clap</a> SHOULD not be present.</span> 
-   <p>For sample entries corresponding to HDR content, <span id="assert-bd7bad9a">the MasteringDisplayColourVolumeBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①⓪">mdcv</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①①">clli</a> SHOULD be present</span>, and <span id="assert-dbf01b08">their values SHALL match the values of contained in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46①">Metadata OBUs</a> of type METADATA_TYPE_HDR_CLL and METADATA_TYPE_HDR_MDCV, if present (in the configOBUs or in the samples).</span></p>
-   <p class="note" role="note"><span class="marker">NOTE:</span> The MasteringDisplayColourVolumeBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①②">mdcv</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①③">clli</a> have identical syntax to the SMPTE2086MasteringDisplayMetadataBox <a class="property css" data-link-type="property" href="https://www.webmproject.org/vp9/mp4/#" id="ref-for-37f26709df4ef02bccacdfb3c0626342">SmDm</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.webmproject.org/vp9/mp4/#" id="ref-for-37f26709df4ef02bccacdfb3c0626342①">CoLL</a>, except that they are of type <code>Box</code> and not <code>FullBox</code>. However, the semantics of the MasteringDisplayColourVolumeBox and SMPTE2086MasteringDisplayMetadataBox have important differences and should not be confused.</p>
-    <span id="assert-fa8b4082">Additional boxes may be provided at the end of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①④">VisualSampleEntry</a> as permitted by ISOBMFF, that may represent redundant or similar information to the one provided in some OBUs contained in the <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox⑤">AV1CodecConfigurationBox</a></span>. If the box definition does not indicate that its information overrides the OBU information, in case of conflict, the OBU information should be considered authoritative. 
+    <span id="assert-6056f4f8">The sample entry SHOULD contain a <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑤">colr</a> box with a colour_type set to <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑥">nclx</a></span>. <span id="assert-77d36bce">If present, the values of colour_primaries, transfer_characteristics, and matrix_coefficients SHALL match the values given in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②③">Sequence Header OBU</a> (in the configOBUs field or in the associated samples) if the color_description_present_flag is set to 1</span>. Similarly, <span id="assert-38597d4f">the full_range_flag in the <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑦">colr</a> box shall match the color_range flag in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②④">Sequence Header OBU</a>. When configOBUs does not contain a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑤">Sequence Header OBU</a>, this box with colour_type set to <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑧">nclx</a> SHALL be present.</span> <span id="assert-7eb8e932">The CleanApertureBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something⑨">clap</a> SHOULD not be present.</span> 
+   <p>For sample entries corresponding to HDR content, <span id="assert-bd7bad9a">the MasteringDisplayColourVolumeBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①⓪">mdcv</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①①">clli</a> SHOULD be present</span>, and <span id="assert-dbf01b08">their values SHALL match the values of contained in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46①">Metadata OBUs</a> of type METADATA_TYPE_HDR_CLL and METADATA_TYPE_HDR_MDCV, if present (in the configOBUs or in the samples).</span></p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> The MasteringDisplayColourVolumeBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①②">mdcv</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①③">clli</a> have identical syntax to the SMPTE2086MasteringDisplayMetadataBox <a class="property css" data-link-type="property" href="https://www.webmproject.org/vp9/mp4/#" id="ref-for-something①④">SmDm</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.webmproject.org/vp9/mp4/#" id="ref-for-something①⑤">CoLL</a>, except that they are of type <code>Box</code> and not <code>FullBox</code>. However, the semantics of the MasteringDisplayColourVolumeBox and SMPTE2086MasteringDisplayMetadataBox have important differences and should not be confused.</p>
+    <span id="assert-fa8b4082">Additional boxes may be provided at the end of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①⑥">VisualSampleEntry</a> as permitted by ISOBMFF, that may represent redundant or similar information to the one provided in some OBUs contained in the <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox⑤">AV1CodecConfigurationBox</a></span>. If the box definition does not indicate that its information overrides the OBU information, in case of conflict, the OBU information should be considered authoritative. 
    <h3 class="heading settled" data-level="2.4" id="sampleformat"><span class="secno">2.4. </span><span class="content">AV1 Sample Format</span><a class="self-link" href="#sampleformat"></a></h3>
    <p>For tracks using the <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry②">AV1SampleEntry</a>, an <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1-sample">AV1 Sample</dfn> has the following constraints:</p>
    <ul>
@@ -2211,15 +2267,15 @@ <h3 class="heading settled" data-level="2.4" id="sampleformat"><span class="secn
    <p class="note" role="note"><span class="marker">NOTE:</span> Within this definition, a sync sample may contain additional frames that are not Key Frames. The fact that none of them is the first frame in the temporal unit ensures that they are decodable.</p>
    <p class="note" role="note"><span class="marker">NOTE:</span> Other types of OBUs such as <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46③">metadata OBUs</a> could be present before the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑦">Sequence Header OBU</a>.</p>
     <span id="assert-0c895956"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑦">Intra-only frames</a> SHOULD be signaled using the sample_depends_on flag set to 2</span>. <span id="assert-4f779503"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑦">Delayed Random Access Points</a> SHOULD be signaled using sample groups and the <a data-link-type="dfn" href="#av1forwardkeyframesamplegroupentry" id="ref-for-av1forwardkeyframesamplegroupentry①">AV1ForwardKeyFrameSampleGroupEntry</a></span>. <span id="assert-d10ee363"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑧">Switch Frames</a> SHOULD be signaled using sample groups and the <a data-link-type="dfn" href="#av1switchframesamplegroupentry" id="ref-for-av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</a></span>. 
-   <p>Additionally, <span id="assert-ccbd7555">if a file contains multiple tracks that are alternative representations of the same content, in particular using <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑨">Switch Frames</a>, those tracks SHOULD be marked as belonging to the same alternate group</span> and <span id="assert-2fee74f1">should use a track selection box with an appropriate attribute (e.g. <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①⑤">bitr</a>)</span>.</p>
-    <span id="assert-0f174d22">In tracks using the <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry③">AV1SampleEntry</a>, the <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①⑥">ctts</a> box and composition offsets in movie fragments SHALL NOT be used</span>. Similarly, <span id="assert-cb746c39">the is_leading flag, if used, SHALL be set to 0 or 2</span>. <span id="assert-227cd7b6">When a temporal unit contains more than one frame, the sample corresponding to that temporal unit MAY be marked using the <a data-link-type="dfn" href="#av1multiframesamplegroupentry" id="ref-for-av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</a></span>. <span id="assert-e8ac7f22"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46④">Metadata OBUs</a> may be carried in sample data</span>. In this case, <span id="assert-d41e5e3f">the <a data-link-type="dfn" href="#av1metadatasamplegroupentry" id="ref-for-av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</a> SHOULD be used</span>. <span id="assert-f0ce5ae3">If the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑤">metadata OBUs</a> are static for the entire set of samples associated with a given sample description entry, they SHOULD also be in the OBU array in the sample description entry</span>. 
+   <p>Additionally, <span id="assert-ccbd7555">if a file contains multiple tracks that are alternative representations of the same content, in particular using <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑨">Switch Frames</a>, those tracks SHOULD be marked as belonging to the same alternate group</span> and <span id="assert-2fee74f1">should use a track selection box with an appropriate attribute (e.g. <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①⑦">bitr</a>)</span>.</p>
+    <span id="assert-0f174d22">In tracks using the <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry③">AV1SampleEntry</a>, the <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-something①⑧">ctts</a> box and composition offsets in movie fragments SHALL NOT be used</span>. Similarly, <span id="assert-cb746c39">the is_leading flag, if used, SHALL be set to 0 or 2</span>. <span id="assert-227cd7b6">When a temporal unit contains more than one frame, the sample corresponding to that temporal unit MAY be marked using the <a data-link-type="dfn" href="#av1multiframesamplegroupentry" id="ref-for-av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</a></span>. <span id="assert-e8ac7f22"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46④">Metadata OBUs</a> may be carried in sample data</span>. In this case, <span id="assert-d41e5e3f">the <a data-link-type="dfn" href="#av1metadatasamplegroupentry" id="ref-for-av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</a> SHOULD be used</span>. <span id="assert-f0ce5ae3">If the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑤">metadata OBUs</a> are static for the entire set of samples associated with a given sample description entry, they SHOULD also be in the OBU array in the sample description entry</span>. 
    <p>Unless explicitely stated, the grouping_type_parameter is not defined for the SampleToGroupBox with grouping types defined in this specification.</p>
    <h3 class="heading settled" data-level="2.5" id="forwardkeyframesamplegroupentry"><span class="secno">2.5. </span><span class="content">AV1 Forward Key Frame sample group entry</span><a class="self-link" href="#forwardkeyframesamplegroupentry"></a></h3>
    <h4 class="heading settled" data-level="2.5.1" id="forwardkeyframesamplegroupentry-definition"><span class="secno">2.5.1. </span><span class="content">Definition</span><a class="self-link" href="#forwardkeyframesamplegroupentry-definition"></a></h4>
 <pre class="def">Group Type: <dfn data-dfn-type="dfn" data-export id="av1f">av1f<a class="self-link" href="#av1f"></a></dfn>
 Container:  Sample Group Description Box ('sgpd')
-<span id="assert-b19a22ce">Mandatory:  No <p hidden>for av1f</p></span>
-<span id="assert-6de7aff7">Quantity:   Zero or more <p hidden>for av1f</p></span>.
+<span id="assert-b19a22ce">Mandatory:  No <span hidden>for av1f<p></p></span></span>
+<span id="assert-6de7aff7">Quantity:   Zero or more <span hidden>for av1f<p></p></span></span>.
 </pre>
    <h4 class="heading settled" data-level="2.5.2" id="forwardkeyframesamplegroupentry-description"><span class="secno">2.5.2. </span><span class="content">Description</span><a class="self-link" href="#forwardkeyframesamplegroupentry-description"></a></h4>
    <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</dfn> documents samples that contain a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑧">Delayed Random Access Point</a> that are followed at a given distance in the bitstream by a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑨">Key Frame Dependent Recovery Point</a>.</p>
@@ -2234,8 +2290,8 @@ <h3 class="heading settled" data-level="2.6" id="multiframesamplegroupentry"><sp
    <h4 class="heading settled" data-level="2.6.1" id="multiframesamplegroupentry-definition"><span class="secno">2.6.1. </span><span class="content">Definition</span><a class="self-link" href="#multiframesamplegroupentry-definition"></a></h4>
 <pre class="def">Group Type: <dfn data-dfn-for="AV1MultiFrameSampleGroupEntry" data-dfn-type="value" data-export id="valdef-av1multiframesamplegroupentry-av1m">av1m<a class="self-link" href="#valdef-av1multiframesamplegroupentry-av1m"></a></dfn>
 Container:  Sample Group Description Box ('sgpd')
-<span id="assert-5482ba80">Mandatory:  No <p hidden>for av1m</p></span>
-<span id="assert-35d7f2e6">Quantity:   Zero or more <p hidden>for av1m</p></span>.
+<span id="assert-5482ba80">Mandatory:  No <span hidden>for av1m<p></p></span></span>
+<span id="assert-35d7f2e6">Quantity:   Zero or more <span hidden>for av1m<p></p></span></span>.
 </pre>
    <h4 class="heading settled" data-level="2.6.2" id="multiframesamplegroupentry-description"><span class="secno">2.6.2. </span><span class="content">Description</span><a class="self-link" href="#multiframesamplegroupentry-description"></a></h4>
    <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</dfn> documents samples that contain multiple frames.</p>
@@ -2247,8 +2303,8 @@ <h3 class="heading settled" data-level="2.7" id="switchframesamplegroupentry"><s
    <h4 class="heading settled" data-level="2.7.1" id="switchframesamplegroupentry-definition"><span class="secno">2.7.1. </span><span class="content">Definition</span><a class="self-link" href="#switchframesamplegroupentry-definition"></a></h4>
 <pre class="def">Group Type: <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="av1s">av1s</dfn>
 Container:  Sample Group Description Box ('sgpd')
-<span id="assert-72c62575">Mandatory:  No <p hidden>for av1s</p></span>
-<span id="assert-731712f5">Quantity:   Zero or more <p hidden>for av1s</p></span>.
+<span id="assert-72c62575">Mandatory:  No <span hidden>for av1s<p></p></span></span>
+<span id="assert-731712f5">Quantity:   Zero or more <span hidden>for av1s<p></p></span></span>.
 </pre>
    <h4 class="heading settled" data-level="2.7.2" id="switchframesamplegroupentry-description"><span class="secno">2.7.2. </span><span class="content">Description</span><a class="self-link" href="#switchframesamplegroupentry-description"></a></h4>
    <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</dfn> documents samples that start with a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13①⓪">Switch Frame</a>.</p>
@@ -2260,8 +2316,8 @@ <h3 class="heading settled" data-level="2.8" id="metadatasamplegroupentry"><span
    <h4 class="heading settled" data-level="2.8.1" id="metadatasamplegroupentry-definition"><span class="secno">2.8.1. </span><span class="content">Definition</span><a class="self-link" href="#metadatasamplegroupentry-definition"></a></h4>
 <pre class="def">Group Type: <dfn data-dfn-for="AV1MetadataSampleGroupEntry" data-dfn-type="value" data-noexport id="valdef-av1metadatasamplegroupentry-av1m">av1M<a class="self-link" href="#valdef-av1metadatasamplegroupentry-av1m"></a></dfn>
 Container:  Sample Group Description Box ('sgpd')
-<span id="assert-b6627aa5">Mandatory:  No <p hidden>for av1M</p></span>
-<span id="assert-fa0bc954">Quantity:   Zero or more <p hidden>for av1M</p></span>.
+<span id="assert-b6627aa5">Mandatory:  No <span hidden>for av1M<p></p></span></span>
+<span id="assert-fa0bc954">Quantity:   Zero or more <span hidden>for av1M<p></p></span></span>.
 </pre>
    <h4 class="heading settled" data-level="2.8.2" id="metadatasamplegroupentry-description"><span class="secno">2.8.2. </span><span class="content">Description</span><a class="self-link" href="#metadatasamplegroupentry-description"></a></h4>
    <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</dfn> documents samples that contain <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑥">metadata OBUs</a>. The <code>grouping_type_parameter</code> can be used to identify samples containing <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑦">metadata OBUs</a> of a given type. If no <code>grouping_type_parameter</code> is provided, the sample group entry identifies samples containing <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑧">metadata OBUs</a> for which the <code>metadata_type</code> is unknown.</p>
@@ -2279,8 +2335,8 @@ <h4 class="heading settled" data-level="2.8.4" id="metadatasamplegroupentry-sema
    <p><dfn data-dfn-type="dfn" data-export id="metadata_type">metadata_type<a class="self-link" href="#metadata_type"></a></dfn> is a 8-bit field whose value is the value of the metadata_type field defined in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a>, when it is equal or lower than 255. metadata_type values above 255 are not supported by this sample group.</p>
    <p><dfn data-dfn-type="dfn" data-export id="metadata_specific_parameters">metadata_specific_parameters<a class="self-link" href="#metadata_specific_parameters"></a></dfn> provides an additional part of the <code>grouping_type_parameter</code>, which MAY be used to distinguish different sample groups having the same <code>metadata_type</code> but different sub-parameters. <span id="assert-7d13a03d">In this version of the specification, <code>metadata_specific_parameters</code> is only defined when <code>metadata_type</code> is set to <code>METADATA_TYPE_ITUT_T35</code> in which case its value SHALL be set to the first 24 bits of the <code>metadata_itut_t35</code> structure.</span> <span id="assert-973cddc9">For other types of metadata, its value SHOULD be set to 0. In all cases, when the <code>grouping_type_parameter</code> is used, readers processing sample groups SHALL use the entire value of <code>grouping_type_parameter</code></span>.</p>
    <h2 class="heading settled" data-level="3" id="cmaf"><span class="secno">3. </span><span class="content">CMAF AV1 track format</span><a class="self-link" href="#cmaf"></a></h2>
-   <p><a data-link-type="biblio" href="#biblio-cmaf" title="Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media">[CMAF]</a> defines structural constraints on ISOBMFF files additional to <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a> for the purpose of, for example, adaptive streaming or for protected files. Conformance to these structural constraints is signaled by the presence of the brand <code><a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="ref-for-1568b5183e757fdee5323510bdd1a120">cmfc</a></code> in the <code>FileTypeBox</code>.</p>
-   <p>If a <a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="ref-for-1568b5183e757fdee5323510bdd1a120①">CMAF Video Track</a> uses the brand <code>av01</code>, it is called a <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="cmaf-av1-track">CMAF AV1 Track</dfn> and the following constraints, defining the CMAF Media Profile for AV1, apply:</p>
+   <p><a data-link-type="biblio" href="#biblio-cmaf" title="Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media">[CMAF]</a> defines structural constraints on ISOBMFF files additional to <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a> for the purpose of, for example, adaptive streaming or for protected files. Conformance to these structural constraints is signaled by the presence of the brand <code><a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="ref-for-something①⑨">cmfc</a></code> in the <code>FileTypeBox</code>.</p>
+   <p>If a <a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="ref-for-something②⓪">CMAF Video Track</a> uses the brand <code>av01</code>, it is called a <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="cmaf-av1-track">CMAF AV1 Track</dfn> and the following constraints, defining the CMAF Media Profile for AV1, apply:</p>
    <ul>
     <li data-md><span id="assert-f261aa51">it SHALL use an <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry④">AV1SampleEntry</a></span> 
     <li data-md>
@@ -2302,7 +2358,7 @@ <h2 class="heading settled" data-level="3" id="cmaf"><span class="secno">3. </sp
    </ul>
     <span id="assert-7250f9ce">When protected, <a data-link-type="dfn" href="#cmaf-av1-track" id="ref-for-cmaf-av1-track">CMAF AV1 Tracks</a> SHALL use the signaling defined in <a data-link-type="biblio" href="#biblio-cmaf" title="Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media">[CMAF]</a>, which in turn relies on <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a>, with the provisions specified in <a href="#CommonEncryption">§ 4 Common Encryption</a></span>. 
    <h2 class="heading settled" data-level="4" id="CommonEncryption"><span class="secno">4. </span><span class="content">Common Encryption</span><a class="self-link" href="#CommonEncryption"></a></h2>
-    <span id="assert-6eb63a07"><a data-link-type="dfn" href="#cmaf-av1-track" id="ref-for-cmaf-av1-track①">CMAF AV1 Tracks</a> and non-segmented AV1 files MAY be protected</span>. <span id="assert-89e67c25">If protected, they SHALL conform to <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a></span>. <span id="assert-2a42f17e">Files SHOULD be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f">cbcs</a></code> protection scheme</span> and <span id="assert-105dfb43">MAY be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①">cenc</a></code> protection scheme</span>. <span id="assert-44221cba">When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f②">cenc</a></code> is used, samples SHALL be protected using subsample encryption</span> and <span id="assert-aa4aefdb">SHALL NOT use pattern encryption</span>. <span id="assert-0113b336">When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f③">cbcs</a></code> is used, samples SHALL be protected using subsample encryption</span> and <span id="assert-95fbc893">SHALL use pattern encryption</span>. <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a> recommends that the Block Pattern length be 10, i.e. <code>crypt_byte_block + skip_byte_block = 10</code>, where a Block is of size 16-bytes. In this specification, the combination of <code>crypt_byte_block</code> and <code>skip_byte_block</code> SHALL be one of the following, with the first one being recommended: 
+    <span id="assert-6eb63a07"><a data-link-type="dfn" href="#cmaf-av1-track" id="ref-for-cmaf-av1-track①">CMAF AV1 Tracks</a> and non-segmented AV1 files MAY be protected</span>. <span id="assert-89e67c25">If protected, they SHALL conform to <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a></span>. <span id="assert-2a42f17e">Files SHOULD be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②①">cbcs</a></code> protection scheme</span> and <span id="assert-105dfb43">MAY be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②②">cenc</a></code> protection scheme</span>. <span id="assert-44221cba">When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②③">cenc</a></code> is used, samples SHALL be protected using subsample encryption</span> and <span id="assert-aa4aefdb">SHALL NOT use pattern encryption</span>. <span id="assert-0113b336">When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②④">cbcs</a></code> is used, samples SHALL be protected using subsample encryption</span> and <span id="assert-95fbc893">SHALL use pattern encryption</span>. <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a> recommends that the Block Pattern length be 10, i.e. <code>crypt_byte_block + skip_byte_block = 10</code>, where a Block is of size 16-bytes. In this specification, the combination of <code>crypt_byte_block</code> and <code>skip_byte_block</code> SHALL be one of the following, with the first one being recommended: 
    <ul>
     <li data-md><span id="assert-51e8a94d"><code>crypt_byte_block = 1</code> and <code>skip_byte_block = 9</code></span>, 
     <li data-md><span id="assert-973b126b"><code>crypt_byte_block = 5</code> and <code>skip_byte_block = 5</code></span>, 
@@ -2315,7 +2371,7 @@ <h3 class="heading settled" data-level="4.1" id="subsample-encryption"><span cla
      <span id="assert-d84cddee">Protected samples SHALL be exactly spanned by one or more contiguous subsamples</span>. 
      <ul>
       <li data-md><span id="assert-38a31899">An OBU MAY be spanned by one or more subsamples</span>, especially when it has multiple ranges of protected data. However, as recommended in <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a>, writers SHOULD reduce the number of subsamples as possible. This can be achieved by using a subsample that spans multiple consecutive unprotected OBUs as well as the first unprotected and protected parts of the following protected OBU, if such protected OBU exists. 
-      <li data-md><span id="assert-02d6b0e9">A large unprotected OBU whose data size is larger than the maximum size of a single <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f④">BytesOfClearData</a> field MAY be spanned by multiple subsamples with zero size <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑤">BytesOfProtectedData</a></span>. 
+      <li data-md><span id="assert-02d6b0e9">A large unprotected OBU whose data size is larger than the maximum size of a single <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②⑤">BytesOfClearData</a> field MAY be spanned by multiple subsamples with zero size <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②⑥">BytesOfProtectedData</a></span>. 
      </ul>
     <li data-md><span id="assert-b8cabcad">All <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40" id="ref-for-page=40①">OBU Headers</a> and associated <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑥">obu_size</a> fields SHALL be unprotected</span>. 
     <li data-md><span id="assert-4b9592fb"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑨">Temporal Delimiter OBUs</a>, <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑧">Sequence Header OBUs</a>, and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49②">Frame Header OBUs</a> (including within a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71">Frame OBU</a>), <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121①">Redundant Frame Header OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121②">Padding OBUs</a> SHALL be unprotected</span>. 
@@ -2324,26 +2380,26 @@ <h3 class="heading settled" data-level="4.1" id="subsample-encryption"><span cla
      <span id="assert-8750fa6f"><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71①">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71②">Frame OBUs</a> SHALL be protected</span>. Within <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71③">Tile Group OBUs</a> or <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71④">Frame OBUs</a>, the following applies: 
      <ul>
       <li data-md>
-       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑥">cbcs</a></code>:</p>
+       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②⑦">cbcs</a></code>:</p>
        <ul>
-        <li data-md><span id="assert-61f691fe"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑦">BytesOfProtectedData</a> SHALL start on the first byte and end on the last byte of the <code>decode_tile</code> structure (including any trailing bits)</span>. 
+        <li data-md><span id="assert-61f691fe"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②⑧">BytesOfProtectedData</a> SHALL start on the first byte and end on the last byte of the <code>decode_tile</code> structure (including any trailing bits)</span>. 
        </ul>
-       <p class="note" role="note"><span class="marker">NOTE:</span> As a result of the above, <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑧">BytesOfProtectedData</a> is not necessarily a multiple of 16 bytes and partial blocks are included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑨">BytesOfProtectedData</a> range, but per <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a> the data is not be encrypted.</p>
+       <p class="note" role="note"><span class="marker">NOTE:</span> As a result of the above, <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②⑨">BytesOfProtectedData</a> is not necessarily a multiple of 16 bytes and partial blocks are included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③⓪">BytesOfProtectedData</a> range, but per <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a> the data is not be encrypted.</p>
        <ul>
         <li data-md><span id="assert-6547e5e3">A subsample SHALL be created for each tile, even if its size is less than 16 bytes</span>. 
-        <li data-md><span id="assert-68939155">All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑤">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑥">Frame OBUs</a> SHALL be unprotected <p hidden>for cbcs</p></span>. 
+        <li data-md><span id="assert-68939155">All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑤">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑥">Frame OBUs</a> SHALL be unprotected <span hidden>for cbcs<p></p></span></span>. 
        </ul>
       <li data-md>
-       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①⓪">cenc</a></code>:</p>
+       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③①">cenc</a></code>:</p>
        <ul>
-        <li data-md><span id="assert-da5e71ae"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①①">BytesOfProtectedData</a> SHALL be a multiple of 16 bytes</span>. 
-        <li data-md><span id="assert-839432b2"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①②">BytesOfProtectedData</a> SHALL end on the last byte of the <code>decode_tile</code> structure (including any trailing bits)</span>. 
-        <li data-md><span id="assert-b9de48fc"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①③">BytesOfProtectedData</a> SHALL span all complete 16-byte blocks of the <code>decode_tile</code> structure (including any trailing bits)</span>. 
+        <li data-md><span id="assert-da5e71ae"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③②">BytesOfProtectedData</a> SHALL be a multiple of 16 bytes</span>. 
+        <li data-md><span id="assert-839432b2"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③③">BytesOfProtectedData</a> SHALL end on the last byte of the <code>decode_tile</code> structure (including any trailing bits)</span>. 
+        <li data-md><span id="assert-b9de48fc"><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③④">BytesOfProtectedData</a> SHALL span all complete 16-byte blocks of the <code>decode_tile</code> structure (including any trailing bits)</span>. 
        </ul>
-       <p class="note" role="note"><span class="marker">NOTE:</span> As a result of the above, partial blocks are not used and it is possible that <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①④">BytesOfProtectedData</a> does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.</p>
+       <p class="note" role="note"><span class="marker">NOTE:</span> As a result of the above, partial blocks are not used and it is possible that <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③⑤">BytesOfProtectedData</a> does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.</p>
        <ul>
-        <li data-md><span id="assert-df6aa49f">A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes</span>. <span id="assert-e145e592">If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①⑤">BytesOfClearData</a> field of a surrounding subsample, if any</span>. 
-        <li data-md><span id="assert-f7394188">All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑦">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑧">Frame OBUs</a> SHALL be unprotected <p hidden>for cenc</p></span>. 
+        <li data-md><span id="assert-df6aa49f">A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes</span>. <span id="assert-e145e592">If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③⑥">BytesOfClearData</a> field of a surrounding subsample, if any</span>. 
+        <li data-md><span id="assert-f7394188">All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑦">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑧">Frame OBUs</a> SHALL be unprotected <span hidden>for cenc<p></p></span></span>. 
        </ul>
      </ul>
    </ul>
@@ -2354,7 +2410,7 @@ <h3 class="heading settled" data-level="4.2" id="subsample-encryption-illustrati
     <figcaption>Subsample-based AV1 encryption.</figcaption>
    </figure>
    <h2 class="heading settled" data-level="5" id="codecsparam"><span class="secno">5. </span><span class="content">Codecs Parameter String</span><a class="self-link" href="#codecsparam"></a></h2>
-   <p>DASH and other applications require defined values for the <a class="property css" data-link-type="property" href="https://tools.ietf.org/html/rfc6381#" id="ref-for-df8441526d3bbb5086bd93c1fae005b3">Codecs</a> parameter specified in <a data-link-type="biblio" href="#biblio-rfc6381" title="The &apos;Codecs&apos; and &apos;Profiles&apos; Parameters for &quot;Bucket&quot; Media Types">[RFC6381]</a> for ISO Media tracks. The codecs parameter string for the AOM AV1 codec is as follows:</p>
+   <p>DASH and other applications require defined values for the <a class="property css" data-link-type="property" href="https://tools.ietf.org/html/rfc6381#" id="ref-for-something③⑦">Codecs</a> parameter specified in <a data-link-type="biblio" href="#biblio-rfc6381" title="The &apos;Codecs&apos; and &apos;Profiles&apos; Parameters for &quot;Bucket&quot; Media Types">[RFC6381]</a> for ISO Media tracks. The codecs parameter string for the AOM AV1 codec is as follows:</p>
 <pre>&lt;sample entry 4CC>.&lt;profile>.&lt;level>&lt;tier>.&lt;bitDepth>.&lt;monochrome>.&lt;chromaSubsampling>.
 &lt;colorPrimaries>.&lt;transferCharacteristics>.&lt;matrixCoefficients>.&lt;videoFullRangeFlag>
 </pre>
@@ -2581,581 +2637,88 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#version">version</a><span>, in § 2.3.4</span>
    <li><a href="#width">width</a><span>, in § 2.2.4</span>
   </ul>
-  <aside aria-labelledby="infopaneltitle-for-f03adbccd0f71dbd64db6303812028fa" class="dfn-panel" data-for="f03adbccd0f71dbd64db6303812028fa" id="infopanel-for-f03adbccd0f71dbd64db6303812028fa">
-   <span id="infopaneltitle-for-f03adbccd0f71dbd64db6303812028fa" style="display:none">Info about the 'av1 bitstream' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=1">1. Bitstream features overview</a>
-    <li><a href="#ref-for-page=1①">2. Basic Encapsulation Scheme</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-3832a1720800015cee7b0703f7328c35" class="dfn-panel" data-for="3832a1720800015cee7b0703f7328c35" id="infopanel-for-3832a1720800015cee7b0703f7328c35">
-   <span id="infopaneltitle-for-3832a1720800015cee7b0703f7328c35" style="display:none">Info about the 'buffer_removal_time' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-559078660a67169a7db62632f96f0f56" class="dfn-panel" data-for="559078660a67169a7db62632f96f0f56" id="infopanel-for-559078660a67169a7db62632f96f0f56">
-   <span id="infopaneltitle-for-559078660a67169a7db62632f96f0f56" style="display:none">Info about the 'color_config' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=44">2.3.4. Semantics</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-ffd6a013c385ccb5c6974a36f39c9419" class="dfn-panel" data-for="ffd6a013c385ccb5c6974a36f39c9419" id="infopanel-for-ffd6a013c385ccb5c6974a36f39c9419">
-   <span id="infopaneltitle-for-ffd6a013c385ccb5c6974a36f39c9419" style="display:none">Info about the 'delayed random access point' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=206">1. Bitstream features overview</a> <a href="#ref-for-page=206①">(2)</a> <a href="#ref-for-page=206②">(3)</a> <a href="#ref-for-page=206③">(4)</a> <a href="#ref-for-page=206④">(5)</a> <a href="#ref-for-page=206⑤">(6)</a> <a href="#ref-for-page=206⑥">(7)</a>
-    <li><a href="#ref-for-page=206⑦">2.4. AV1 Sample Format</a>
-    <li><a href="#ref-for-page=206⑧">2.5.2. Description</a> <a href="#ref-for-page=206⑨">(2)</a>
-    <li><a href="#ref-for-page=206①⓪">2.5.4. Semantics</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-d58adec65fc7472c4103fc0ce48ffad2" class="dfn-panel" data-for="d58adec65fc7472c4103fc0ce48ffad2" id="infopanel-for-d58adec65fc7472c4103fc0ce48ffad2">
-   <span id="infopaneltitle-for-d58adec65fc7472c4103fc0ce48ffad2" style="display:none">Info about the 'frame header obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=49">2.3.4. Semantics</a>
-    <li><a href="#ref-for-page=49①">2.4. AV1 Sample Format</a>
-    <li><a href="#ref-for-page=49②">4.1. General Subsample Encryption constraints</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-61cc567b8d2c37a5482c59baafb6b8ff" class="dfn-panel" data-for="61cc567b8d2c37a5482c59baafb6b8ff" id="infopanel-for-61cc567b8d2c37a5482c59baafb6b8ff">
-   <span id="infopaneltitle-for-61cc567b8d2c37a5482c59baafb6b8ff" style="display:none">Info about the 'frame obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=71">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=71①">(2)</a> <a href="#ref-for-page=71②">(3)</a> <a href="#ref-for-page=71③">(4)</a> <a href="#ref-for-page=71④">(5)</a> <a href="#ref-for-page=71⑤">(6)</a> <a href="#ref-for-page=71⑥">(7)</a> <a href="#ref-for-page=71⑦">(8)</a> <a href="#ref-for-page=71⑧">(9)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-44bda72a7faed4e3816a653629cc8043" class="dfn-panel" data-for="44bda72a7faed4e3816a653629cc8043" id="infopanel-for-44bda72a7faed4e3816a653629cc8043">
-   <span id="infopaneltitle-for-44bda72a7faed4e3816a653629cc8043" style="display:none">Info about the 'frame_presentation_time' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-8720e7b90737c186d54125451a6578c3" class="dfn-panel" data-for="8720e7b90737c186d54125451a6578c3" id="infopanel-for-8720e7b90737c186d54125451a6578c3">
-   <span id="infopaneltitle-for-8720e7b90737c186d54125451a6578c3" style="display:none">Info about the 'initial_display_delay_minus_1' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-320f0b8648b2c86937bd5df124c0721c" class="dfn-panel" data-for="320f0b8648b2c86937bd5df124c0721c" id="infopanel-for-320f0b8648b2c86937bd5df124c0721c">
-   <span id="infopaneltitle-for-320f0b8648b2c86937bd5df124c0721c" style="display:none">Info about the 'inter frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
-    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
-    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-48602d12010b460d62666543107dbb8c" class="dfn-panel" data-for="48602d12010b460d62666543107dbb8c" id="infopanel-for-48602d12010b460d62666543107dbb8c">
-   <span id="infopaneltitle-for-48602d12010b460d62666543107dbb8c" style="display:none">Info about the 'intra-only frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
-    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
-    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-f8cc04bc4613acfd789110ae277063a3" class="dfn-panel" data-for="f8cc04bc4613acfd789110ae277063a3" id="infopanel-for-f8cc04bc4613acfd789110ae277063a3">
-   <span id="infopaneltitle-for-f8cc04bc4613acfd789110ae277063a3" style="display:none">Info about the 'key frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
-    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
-    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-295ffdcbb0b3062ed4b9d6391d6555f8" class="dfn-panel" data-for="295ffdcbb0b3062ed4b9d6391d6555f8" id="infopanel-for-295ffdcbb0b3062ed4b9d6391d6555f8">
-   <span id="infopaneltitle-for-295ffdcbb0b3062ed4b9d6391d6555f8" style="display:none">Info about the 'key frame dependent recovery point' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=206">1. Bitstream features overview</a> <a href="#ref-for-page=206①">(2)</a> <a href="#ref-for-page=206②">(3)</a> <a href="#ref-for-page=206③">(4)</a> <a href="#ref-for-page=206④">(5)</a> <a href="#ref-for-page=206⑤">(6)</a> <a href="#ref-for-page=206⑥">(7)</a>
-    <li><a href="#ref-for-page=206⑦">2.4. AV1 Sample Format</a>
-    <li><a href="#ref-for-page=206⑧">2.5.2. Description</a> <a href="#ref-for-page=206⑨">(2)</a>
-    <li><a href="#ref-for-page=206①⓪">2.5.4. Semantics</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-effc5260e6921d7355a31efe9e581f5e" class="dfn-panel" data-for="effc5260e6921d7355a31efe9e581f5e" id="infopanel-for-effc5260e6921d7355a31efe9e581f5e">
-   <span id="infopaneltitle-for-effc5260e6921d7355a31efe9e581f5e" style="display:none">Info about the 'low overhead bitstream format' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=39">1. Bitstream features overview</a>
-    <li><a href="#ref-for-page=39①">2.3.4. Semantics</a>
-    <li><a href="#ref-for-page=39②">2.4. AV1 Sample Format</a> <a href="#ref-for-page=39③">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-2f273a655f76900606361284b223527c" class="dfn-panel" data-for="2f273a655f76900606361284b223527c" id="infopanel-for-2f273a655f76900606361284b223527c">
-   <span id="infopaneltitle-for-2f273a655f76900606361284b223527c" style="display:none">Info about the 'max_frame_height_minus_1' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-607e04e0caddfe3e61efb6ea8770130c" class="dfn-panel" data-for="607e04e0caddfe3e61efb6ea8770130c" id="infopanel-for-607e04e0caddfe3e61efb6ea8770130c">
-   <span id="infopaneltitle-for-607e04e0caddfe3e61efb6ea8770130c" style="display:none">Info about the 'max_frame_width_minus_1' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-cd1fdf90baa77d8296625f83349a558c" class="dfn-panel" data-for="cd1fdf90baa77d8296625f83349a558c" id="infopanel-for-cd1fdf90baa77d8296625f83349a558c">
-   <span id="infopaneltitle-for-cd1fdf90baa77d8296625f83349a558c" style="display:none">Info about the 'metadata obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=46">2.3.4. Semantics</a> <a href="#ref-for-page=46①">(2)</a>
-    <li><a href="#ref-for-page=46②">2.4. AV1 Sample Format</a> <a href="#ref-for-page=46③">(2)</a> <a href="#ref-for-page=46④">(3)</a> <a href="#ref-for-page=46⑤">(4)</a>
-    <li><a href="#ref-for-page=46⑥">2.8.2. Description</a> <a href="#ref-for-page=46⑦">(2)</a> <a href="#ref-for-page=46⑧">(3)</a>
-    <li><a href="#ref-for-page=46⑨">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=46①⓪">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-eb0782dfea22c80ac75d63b45a421c45" class="dfn-panel" data-for="eb0782dfea22c80ac75d63b45a421c45" id="infopanel-for-eb0782dfea22c80ac75d63b45a421c45">
-   <span id="infopaneltitle-for-eb0782dfea22c80ac75d63b45a421c45" style="display:none">Info about the 'mono_chrome' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-fad0316db590b5b97f2a78eea1a20567" class="dfn-panel" data-for="fad0316db590b5b97f2a78eea1a20567" id="infopanel-for-fad0316db590b5b97f2a78eea1a20567">
-   <span id="infopaneltitle-for-fad0316db590b5b97f2a78eea1a20567" style="display:none">Info about the 'obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=39">1. Bitstream features overview</a>
-    <li><a href="#ref-for-page=39①">2.3.4. Semantics</a>
-    <li><a href="#ref-for-page=39②">2.4. AV1 Sample Format</a> <a href="#ref-for-page=39③">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-bcf179fe5dc66841b8ee6f4bf7024547" class="dfn-panel" data-for="bcf179fe5dc66841b8ee6f4bf7024547" id="infopanel-for-bcf179fe5dc66841b8ee6f4bf7024547">
-   <span id="infopaneltitle-for-bcf179fe5dc66841b8ee6f4bf7024547" style="display:none">Info about the 'obu header' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=40">2.3.4. Semantics</a>
-    <li><a href="#ref-for-page=40①">4.1. General Subsample Encryption constraints</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-f9c9cd91bc5ff3e8007f3109e4172022" class="dfn-panel" data-for="f9c9cd91bc5ff3e8007f3109e4172022" id="infopanel-for-f9c9cd91bc5ff3e8007f3109e4172022">
-   <span id="infopaneltitle-for-f9c9cd91bc5ff3e8007f3109e4172022" style="display:none">Info about the 'obu_has_size_field' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-ae8c5a5a2224e16c570d1c72ed7f9ca3" class="dfn-panel" data-for="ae8c5a5a2224e16c570d1c72ed7f9ca3" id="infopanel-for-ae8c5a5a2224e16c570d1c72ed7f9ca3">
-   <span id="infopaneltitle-for-ae8c5a5a2224e16c570d1c72ed7f9ca3" style="display:none">Info about the 'obu_size' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-f41c7b6b409e9137c8b46b0e8192eae7" class="dfn-panel" data-for="f41c7b6b409e9137c8b46b0e8192eae7" id="infopanel-for-f41c7b6b409e9137c8b46b0e8192eae7">
-   <span id="infopaneltitle-for-f41c7b6b409e9137c8b46b0e8192eae7" style="display:none">Info about the 'open_bitstream_unit' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-cb42042994dfc555541c6d2a5b7ac21c" class="dfn-panel" data-for="cb42042994dfc555541c6d2a5b7ac21c" id="infopanel-for-cb42042994dfc555541c6d2a5b7ac21c">
-   <span id="infopaneltitle-for-cb42042994dfc555541c6d2a5b7ac21c" style="display:none">Info about the 'padding obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=121">1. Bitstream features overview</a>
-    <li><a href="#ref-for-page=121①">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=121②">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-2a14dd3c3618065abd5e1df01cd526ce" class="dfn-panel" data-for="2a14dd3c3618065abd5e1df01cd526ce" id="infopanel-for-2a14dd3c3618065abd5e1df01cd526ce">
-   <span id="infopaneltitle-for-2a14dd3c3618065abd5e1df01cd526ce" style="display:none">Info about the 'random access point' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=206">1. Bitstream features overview</a> <a href="#ref-for-page=206①">(2)</a> <a href="#ref-for-page=206②">(3)</a> <a href="#ref-for-page=206③">(4)</a> <a href="#ref-for-page=206④">(5)</a> <a href="#ref-for-page=206⑤">(6)</a> <a href="#ref-for-page=206⑥">(7)</a>
-    <li><a href="#ref-for-page=206⑦">2.4. AV1 Sample Format</a>
-    <li><a href="#ref-for-page=206⑧">2.5.2. Description</a> <a href="#ref-for-page=206⑨">(2)</a>
-    <li><a href="#ref-for-page=206①⓪">2.5.4. Semantics</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-49d4b1324b3e6175214f1de9258652c0" class="dfn-panel" data-for="49d4b1324b3e6175214f1de9258652c0" id="infopanel-for-49d4b1324b3e6175214f1de9258652c0">
-   <span id="infopaneltitle-for-49d4b1324b3e6175214f1de9258652c0" style="display:none">Info about the 'redundant frame header obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=121">1. Bitstream features overview</a>
-    <li><a href="#ref-for-page=121①">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=121②">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-6af483fb580bc8cd300825f157ed0f23" class="dfn-panel" data-for="6af483fb580bc8cd300825f157ed0f23" id="infopanel-for-6af483fb580bc8cd300825f157ed0f23">
-   <span id="infopaneltitle-for-6af483fb580bc8cd300825f157ed0f23" style="display:none">Info about the 'seq_level_idx' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-8c994b92162ebe7ad58fd07f5c951f12" class="dfn-panel" data-for="8c994b92162ebe7ad58fd07f5c951f12" id="infopanel-for-8c994b92162ebe7ad58fd07f5c951f12">
-   <span id="infopaneltitle-for-8c994b92162ebe7ad58fd07f5c951f12" style="display:none">Info about the 'seq_tier' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-0eb96964e5fc585c9760f0cc0f7aa6c3" class="dfn-panel" data-for="0eb96964e5fc585c9760f0cc0f7aa6c3" id="infopanel-for-0eb96964e5fc585c9760f0cc0f7aa6c3">
-   <span id="infopaneltitle-for-0eb96964e5fc585c9760f0cc0f7aa6c3" style="display:none">Info about the 'sequence header obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=41">2.2.4. Semantics</a> <a href="#ref-for-page=41①">(2)</a>
-    <li><a href="#ref-for-page=41②">2.3.4. Semantics</a> <a href="#ref-for-page=41③">(2)</a> <a href="#ref-for-page=41④">(3)</a> <a href="#ref-for-page=41⑤">(4)</a> <a href="#ref-for-page=41⑥">(5)</a> <a href="#ref-for-page=41⑦">(6)</a> <a href="#ref-for-page=41⑧">(7)</a> <a href="#ref-for-page=41⑨">(8)</a> <a href="#ref-for-page=41①⓪">(9)</a> <a href="#ref-for-page=41①①">(10)</a> <a href="#ref-for-page=41①②">(11)</a> <a href="#ref-for-page=41①③">(12)</a> <a href="#ref-for-page=41①④">(13)</a> <a href="#ref-for-page=41①⑤">(14)</a> <a href="#ref-for-page=41①⑥">(15)</a> <a href="#ref-for-page=41①⑦">(16)</a> <a href="#ref-for-page=41①⑧">(17)</a> <a href="#ref-for-page=41①⑨">(18)</a> <a href="#ref-for-page=41②⓪">(19)</a> <a href="#ref-for-page=41②①">(20)</a> <a href="#ref-for-page=41②②">(21)</a> <a href="#ref-for-page=41②③">(22)</a> <a href="#ref-for-page=41②④">(23)</a> <a href="#ref-for-page=41②⑤">(24)</a>
-    <li><a href="#ref-for-page=41②⑥">2.4. AV1 Sample Format</a> <a href="#ref-for-page=41②⑦">(2)</a>
-    <li><a href="#ref-for-page=41②⑧">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=41②⑨">5. Codecs Parameter String</a> <a href="#ref-for-page=41③⓪">(2)</a> <a href="#ref-for-page=41③①">(3)</a> <a href="#ref-for-page=41③②">(4)</a> <a href="#ref-for-page=41③③">(5)</a> <a href="#ref-for-page=41③④">(6)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-8ee84de303b43ec62bb21bf9598287a4" class="dfn-panel" data-for="8ee84de303b43ec62bb21bf9598287a4" id="infopanel-for-8ee84de303b43ec62bb21bf9598287a4">
-   <span id="infopaneltitle-for-8ee84de303b43ec62bb21bf9598287a4" style="display:none">Info about the 'show_existing_frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-6ab350adb6a8d151ef893c148883c990" class="dfn-panel" data-for="6ab350adb6a8d151ef893c148883c990" id="infopanel-for-6ab350adb6a8d151ef893c148883c990">
-   <span id="infopaneltitle-for-6ab350adb6a8d151ef893c148883c990" style="display:none">Info about the 'show_frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-006a3bf07dac848d227cff3f097563c8" class="dfn-panel" data-for="006a3bf07dac848d227cff3f097563c8" id="infopanel-for-006a3bf07dac848d227cff3f097563c8">
-   <span id="infopaneltitle-for-006a3bf07dac848d227cff3f097563c8" style="display:none">Info about the 'subsampling_x' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-eb7fc80c7183639b2fdb78f61ce55a11" class="dfn-panel" data-for="eb7fc80c7183639b2fdb78f61ce55a11" id="infopanel-for-eb7fc80c7183639b2fdb78f61ce55a11">
-   <span id="infopaneltitle-for-eb7fc80c7183639b2fdb78f61ce55a11" style="display:none">Info about the 'subsampling_y' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-8a2bfdfe0bd189daf691bcd702fe8795" class="dfn-panel" data-for="8a2bfdfe0bd189daf691bcd702fe8795" id="infopanel-for-8a2bfdfe0bd189daf691bcd702fe8795">
-   <span id="infopaneltitle-for-8a2bfdfe0bd189daf691bcd702fe8795" style="display:none">Info about the 'switch frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
-    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
-    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-e07ec093ac0a6bd7e497becb0e4dedc1" class="dfn-panel" data-for="e07ec093ac0a6bd7e497becb0e4dedc1" id="infopanel-for-e07ec093ac0a6bd7e497becb0e4dedc1">
-   <span id="infopaneltitle-for-e07ec093ac0a6bd7e497becb0e4dedc1" style="display:none">Info about the 'temporal delimiter obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=46">2.3.4. Semantics</a> <a href="#ref-for-page=46①">(2)</a>
-    <li><a href="#ref-for-page=46②">2.4. AV1 Sample Format</a> <a href="#ref-for-page=46③">(2)</a> <a href="#ref-for-page=46④">(3)</a> <a href="#ref-for-page=46⑤">(4)</a>
-    <li><a href="#ref-for-page=46⑥">2.8.2. Description</a> <a href="#ref-for-page=46⑦">(2)</a> <a href="#ref-for-page=46⑧">(3)</a>
-    <li><a href="#ref-for-page=46⑨">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=46①⓪">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-d71db54f0eeaab45d4615cfd2ca2de3d" class="dfn-panel" data-for="d71db54f0eeaab45d4615cfd2ca2de3d" id="infopanel-for-d71db54f0eeaab45d4615cfd2ca2de3d">
-   <span id="infopaneltitle-for-d71db54f0eeaab45d4615cfd2ca2de3d" style="display:none">Info about the 'temporal unit' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
-    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
-    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-d85adcf672535355b6f59f8ae2a7f312" class="dfn-panel" data-for="d85adcf672535355b6f59f8ae2a7f312" id="infopanel-for-d85adcf672535355b6f59f8ae2a7f312">
-   <span id="infopaneltitle-for-d85adcf672535355b6f59f8ae2a7f312" style="display:none">Info about the 'tile group obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=71">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=71①">(2)</a> <a href="#ref-for-page=71②">(3)</a> <a href="#ref-for-page=71③">(4)</a> <a href="#ref-for-page=71④">(5)</a> <a href="#ref-for-page=71⑤">(6)</a> <a href="#ref-for-page=71⑥">(7)</a> <a href="#ref-for-page=71⑦">(8)</a> <a href="#ref-for-page=71⑧">(9)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-f22120bb18bc0c18d65d82eeeca12326" class="dfn-panel" data-for="f22120bb18bc0c18d65d82eeeca12326" id="infopanel-for-f22120bb18bc0c18d65d82eeeca12326">
-   <span id="infopaneltitle-for-f22120bb18bc0c18d65d82eeeca12326" style="display:none">Info about the 'tile list obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=121">1. Bitstream features overview</a>
-    <li><a href="#ref-for-page=121①">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=121②">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-0bf077100eb0b617c5b8accac3f316c4" class="dfn-panel" data-for="0bf077100eb0b617c5b8accac3f316c4" id="infopanel-for-0bf077100eb0b617c5b8accac3f316c4">
-   <span id="infopaneltitle-for-0bf077100eb0b617c5b8accac3f316c4" style="display:none">Info about the 'timing_info' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=45">2.3.4. Semantics</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-b23305d39492fb7d58d912b81e05ff07" class="dfn-panel" data-for="b23305d39492fb7d58d912b81e05ff07" id="infopanel-for-b23305d39492fb7d58d912b81e05ff07">
-   <span id="infopaneltitle-for-b23305d39492fb7d58d912b81e05ff07" style="display:none">Info about the 'timing_info_present_flag' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-935be28bb2ef232ad16945b2cdb69c0f" class="dfn-panel" data-for="935be28bb2ef232ad16945b2cdb69c0f" id="infopanel-for-935be28bb2ef232ad16945b2cdb69c0f">
-   <span id="infopaneltitle-for-935be28bb2ef232ad16945b2cdb69c0f" style="display:none">Info about the 'bytesofcleardata' external reference.</span><a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4. Common Encryption</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a>
-    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(5)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(6)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(7)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(8)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(9)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(10)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(11)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(12)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-0823905e938db14fa0ce9f54969cea70" class="dfn-panel" data-for="0823905e938db14fa0ce9f54969cea70" id="infopanel-for-0823905e938db14fa0ce9f54969cea70">
-   <span id="infopaneltitle-for-0823905e938db14fa0ce9f54969cea70" style="display:none">Info about the 'bytesofprotecteddata' external reference.</span><a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4. Common Encryption</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a>
-    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(5)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(6)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(7)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(8)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(9)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(10)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(11)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(12)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-2b285af7abdae2d4aab3a7cbedfdd6ab" class="dfn-panel" data-for="2b285af7abdae2d4aab3a7cbedfdd6ab" id="infopanel-for-2b285af7abdae2d4aab3a7cbedfdd6ab">
-   <span id="infopaneltitle-for-2b285af7abdae2d4aab3a7cbedfdd6ab" style="display:none">Info about the 'cbcs' external reference.</span><a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4. Common Encryption</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a>
-    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(5)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(6)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(7)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(8)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(9)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(10)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(11)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(12)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-742c038dd8361327983a92bd81e21859" class="dfn-panel" data-for="742c038dd8361327983a92bd81e21859" id="infopanel-for-742c038dd8361327983a92bd81e21859">
-   <span id="infopaneltitle-for-742c038dd8361327983a92bd81e21859" style="display:none">Info about the 'cenc' external reference.</span><a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4. Common Encryption</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a>
-    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(5)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(6)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(7)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(8)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(9)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(10)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(11)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(12)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-1568b5183e757fdee5323510bdd1a120" class="dfn-panel" data-for="1568b5183e757fdee5323510bdd1a120" id="infopanel-for-1568b5183e757fdee5323510bdd1a120">
-   <span id="infopaneltitle-for-1568b5183e757fdee5323510bdd1a120" style="display:none">Info about the 'cmaf video track' external reference.</span><a href="https://www.iso.org/standard/71975.html#">https://www.iso.org/standard/71975.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-1568b5183e757fdee5323510bdd1a120">3. CMAF AV1 track format</a> <a href="#ref-for-1568b5183e757fdee5323510bdd1a120">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-76fc7918b57ae33e76892402603c6b72" class="dfn-panel" data-for="76fc7918b57ae33e76892402603c6b72" id="infopanel-for-76fc7918b57ae33e76892402603c6b72">
-   <span id="infopaneltitle-for-76fc7918b57ae33e76892402603c6b72" style="display:none">Info about the 'cmfc' external reference.</span><a href="https://www.iso.org/standard/71975.html#">https://www.iso.org/standard/71975.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-1568b5183e757fdee5323510bdd1a120">3. CMAF AV1 track format</a> <a href="#ref-for-1568b5183e757fdee5323510bdd1a120">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-952f01526c87045a89015e38d1931006" class="dfn-panel" data-for="952f01526c87045a89015e38d1931006" id="infopanel-for-952f01526c87045a89015e38d1931006">
-   <span id="infopaneltitle-for-952f01526c87045a89015e38d1931006" style="display:none">Info about the 'bitr' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-52b8fcc7cef8754159148e684a77d02e" class="dfn-panel" data-for="52b8fcc7cef8754159148e684a77d02e" id="infopanel-for-52b8fcc7cef8754159148e684a77d02e">
-   <span id="infopaneltitle-for-52b8fcc7cef8754159148e684a77d02e" style="display:none">Info about the 'clap' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-15388b1662efccc6c0d26daa21eb8a02" class="dfn-panel" data-for="15388b1662efccc6c0d26daa21eb8a02" id="infopanel-for-15388b1662efccc6c0d26daa21eb8a02">
-   <span id="infopaneltitle-for-15388b1662efccc6c0d26daa21eb8a02" style="display:none">Info about the 'clli' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-6351cd1cc3bfb6561867f56587297705" class="dfn-panel" data-for="6351cd1cc3bfb6561867f56587297705" id="infopanel-for-6351cd1cc3bfb6561867f56587297705">
-   <span id="infopaneltitle-for-6351cd1cc3bfb6561867f56587297705" style="display:none">Info about the 'colr' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-1b1b183a7f9c84aa05248368ea7421ba" class="dfn-panel" data-for="1b1b183a7f9c84aa05248368ea7421ba" id="infopanel-for-1b1b183a7f9c84aa05248368ea7421ba">
-   <span id="infopaneltitle-for-1b1b183a7f9c84aa05248368ea7421ba" style="display:none">Info about the 'ctts' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-295c612b69b22d9306c1004b4766efa2" class="dfn-panel" data-for="295c612b69b22d9306c1004b4766efa2" id="infopanel-for-295c612b69b22d9306c1004b4766efa2">
-   <span id="infopaneltitle-for-295c612b69b22d9306c1004b4766efa2" style="display:none">Info about the 'iso6' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-fcf81bf686786e641e169d84d6f6c84a" class="dfn-panel" data-for="fcf81bf686786e641e169d84d6f6c84a" id="infopanel-for-fcf81bf686786e641e169d84d6f6c84a">
-   <span id="infopaneltitle-for-fcf81bf686786e641e169d84d6f6c84a" style="display:none">Info about the 'mdcv' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-f2de67e75e1151de694a7aedeccb7e6c" class="dfn-panel" data-for="f2de67e75e1151de694a7aedeccb7e6c" id="infopanel-for-f2de67e75e1151de694a7aedeccb7e6c">
-   <span id="infopaneltitle-for-f2de67e75e1151de694a7aedeccb7e6c" style="display:none">Info about the 'nclx' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-d72ed60b4c680fa6477d565e9553dd28" class="dfn-panel" data-for="d72ed60b4c680fa6477d565e9553dd28" id="infopanel-for-d72ed60b4c680fa6477d565e9553dd28">
-   <span id="infopaneltitle-for-d72ed60b4c680fa6477d565e9553dd28" style="display:none">Info about the 'visualsampleentry' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-df8441526d3bbb5086bd93c1fae005b3" class="dfn-panel" data-for="df8441526d3bbb5086bd93c1fae005b3" id="infopanel-for-df8441526d3bbb5086bd93c1fae005b3">
-   <span id="infopaneltitle-for-df8441526d3bbb5086bd93c1fae005b3" style="display:none">Info about the 'codecs' external reference.</span><a href="https://tools.ietf.org/html/rfc6381#">https://tools.ietf.org/html/rfc6381#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-df8441526d3bbb5086bd93c1fae005b3">5. Codecs Parameter String</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-37f26709df4ef02bccacdfb3c0626342" class="dfn-panel" data-for="37f26709df4ef02bccacdfb3c0626342" id="infopanel-for-37f26709df4ef02bccacdfb3c0626342">
-   <span id="infopaneltitle-for-37f26709df4ef02bccacdfb3c0626342" style="display:none">Info about the 'coll' external reference.</span><a href="https://www.webmproject.org/vp9/mp4/#">https://www.webmproject.org/vp9/mp4/#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-37f26709df4ef02bccacdfb3c0626342">2.3.4. Semantics</a> <a href="#ref-for-37f26709df4ef02bccacdfb3c0626342">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-b459180629a753573e7c799ce3a57f45" class="dfn-panel" data-for="b459180629a753573e7c799ce3a57f45" id="infopanel-for-b459180629a753573e7c799ce3a57f45">
-   <span id="infopaneltitle-for-b459180629a753573e7c799ce3a57f45" style="display:none">Info about the 'smdm' external reference.</span><a href="https://www.webmproject.org/vp9/mp4/#">https://www.webmproject.org/vp9/mp4/#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-37f26709df4ef02bccacdfb3c0626342">2.3.4. Semantics</a> <a href="#ref-for-37f26709df4ef02bccacdfb3c0626342">(2)</a>
-   </ul>
-  </aside>
   <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span class="content">Terms defined by reference</span><a class="self-link" href="#index-defined-elsewhere"></a></h3>
   <ul class="index">
    <li>
     <a data-link-type="biblio">[AV1]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="f03adbccd0f71dbd64db6303812028fa">av1 bitstream</span>
-     <li><span class="dfn-paneled" id="3832a1720800015cee7b0703f7328c35">buffer_removal_time</span>
-     <li><span class="dfn-paneled" id="559078660a67169a7db62632f96f0f56">color_config</span>
-     <li><span class="dfn-paneled" id="ffd6a013c385ccb5c6974a36f39c9419">delayed random access point</span>
-     <li><span class="dfn-paneled" id="d58adec65fc7472c4103fc0ce48ffad2">frame header obu</span>
-     <li><span class="dfn-paneled" id="61cc567b8d2c37a5482c59baafb6b8ff">frame obu</span>
-     <li><span class="dfn-paneled" id="44bda72a7faed4e3816a653629cc8043">frame_presentation_time</span>
-     <li><span class="dfn-paneled" id="8720e7b90737c186d54125451a6578c3">initial_display_delay_minus_1</span>
-     <li><span class="dfn-paneled" id="320f0b8648b2c86937bd5df124c0721c">inter frame</span>
-     <li><span class="dfn-paneled" id="48602d12010b460d62666543107dbb8c">intra-only frame</span>
-     <li><span class="dfn-paneled" id="f8cc04bc4613acfd789110ae277063a3">key frame</span>
-     <li><span class="dfn-paneled" id="295ffdcbb0b3062ed4b9d6391d6555f8">key frame dependent recovery point</span>
-     <li><span class="dfn-paneled" id="effc5260e6921d7355a31efe9e581f5e">low overhead bitstream format</span>
-     <li><span class="dfn-paneled" id="2f273a655f76900606361284b223527c">max_frame_height_minus_1</span>
-     <li><span class="dfn-paneled" id="607e04e0caddfe3e61efb6ea8770130c">max_frame_width_minus_1</span>
-     <li><span class="dfn-paneled" id="cd1fdf90baa77d8296625f83349a558c">metadata obu</span>
-     <li><span class="dfn-paneled" id="eb0782dfea22c80ac75d63b45a421c45">mono_chrome</span>
-     <li><span class="dfn-paneled" id="fad0316db590b5b97f2a78eea1a20567">obu</span>
-     <li><span class="dfn-paneled" id="bcf179fe5dc66841b8ee6f4bf7024547">obu header</span>
-     <li><span class="dfn-paneled" id="f9c9cd91bc5ff3e8007f3109e4172022">obu_has_size_field</span>
-     <li><span class="dfn-paneled" id="ae8c5a5a2224e16c570d1c72ed7f9ca3">obu_size</span>
-     <li><span class="dfn-paneled" id="f41c7b6b409e9137c8b46b0e8192eae7">open_bitstream_unit</span>
-     <li><span class="dfn-paneled" id="cb42042994dfc555541c6d2a5b7ac21c">padding obu</span>
-     <li><span class="dfn-paneled" id="2a14dd3c3618065abd5e1df01cd526ce">random access point</span>
-     <li><span class="dfn-paneled" id="49d4b1324b3e6175214f1de9258652c0">redundant frame header obu</span>
-     <li><span class="dfn-paneled" id="6af483fb580bc8cd300825f157ed0f23">seq_level_idx</span>
-     <li><span class="dfn-paneled" id="8c994b92162ebe7ad58fd07f5c951f12">seq_tier</span>
-     <li><span class="dfn-paneled" id="0eb96964e5fc585c9760f0cc0f7aa6c3">sequence header obu</span>
-     <li><span class="dfn-paneled" id="8ee84de303b43ec62bb21bf9598287a4">show_existing_frame</span>
-     <li><span class="dfn-paneled" id="6ab350adb6a8d151ef893c148883c990">show_frame</span>
-     <li><span class="dfn-paneled" id="006a3bf07dac848d227cff3f097563c8">subsampling_x</span>
-     <li><span class="dfn-paneled" id="eb7fc80c7183639b2fdb78f61ce55a11">subsampling_y</span>
-     <li><span class="dfn-paneled" id="8a2bfdfe0bd189daf691bcd702fe8795">switch frame</span>
-     <li><span class="dfn-paneled" id="e07ec093ac0a6bd7e497becb0e4dedc1">temporal delimiter obu</span>
-     <li><span class="dfn-paneled" id="d71db54f0eeaab45d4615cfd2ca2de3d">temporal unit</span>
-     <li><span class="dfn-paneled" id="d85adcf672535355b6f59f8ae2a7f312">tile group obu</span>
-     <li><span class="dfn-paneled" id="f22120bb18bc0c18d65d82eeeca12326">tile list obu</span>
-     <li><span class="dfn-paneled" id="0bf077100eb0b617c5b8accac3f316c4">timing_info</span>
-     <li><span class="dfn-paneled" id="b23305d39492fb7d58d912b81e05ff07">timing_info_present_flag</span>
+     <li><span class="dfn-paneled" id="0c2ca1d5">av1 bitstream</span>
+     <li><span class="dfn-paneled" id="37e9fb19">buffer_removal_time</span>
+     <li><span class="dfn-paneled" id="b7ca4bf7">color_config</span>
+     <li><span class="dfn-paneled" id="9d45d75d">delayed random access point</span>
+     <li><span class="dfn-paneled" id="c045a352">frame header obu</span>
+     <li><span class="dfn-paneled" id="831a5a65">frame obu</span>
+     <li><span class="dfn-paneled" id="84de3072">frame_presentation_time</span>
+     <li><span class="dfn-paneled" id="81139bb1">initial_display_delay_minus_1</span>
+     <li><span class="dfn-paneled" id="7edceda2">inter frame</span>
+     <li><span class="dfn-paneled" id="6a4d04ef">intra-only frame</span>
+     <li><span class="dfn-paneled" id="95de707d">key frame</span>
+     <li><span class="dfn-paneled" id="83e6755a">key frame dependent recovery point</span>
+     <li><span class="dfn-paneled" id="8b5d0ee2">low overhead bitstream format</span>
+     <li><span class="dfn-paneled" id="3a5737fd">max_frame_height_minus_1</span>
+     <li><span class="dfn-paneled" id="58ec0510">max_frame_width_minus_1</span>
+     <li><span class="dfn-paneled" id="937ec5c0">metadata obu</span>
+     <li><span class="dfn-paneled" id="50388659">mono_chrome</span>
+     <li><span class="dfn-paneled" id="fdf4231e">obu</span>
+     <li><span class="dfn-paneled" id="b4bb1520">obu header</span>
+     <li><span class="dfn-paneled" id="9c2e006a">obu_has_size_field</span>
+     <li><span class="dfn-paneled" id="c19d5874">obu_size</span>
+     <li><span class="dfn-paneled" id="da136fa8">open_bitstream_unit</span>
+     <li><span class="dfn-paneled" id="2181eb6c">padding obu</span>
+     <li><span class="dfn-paneled" id="6406abdb">random access point</span>
+     <li><span class="dfn-paneled" id="f80f4aa7">redundant frame header obu</span>
+     <li><span class="dfn-paneled" id="48d18ec8">seq_level_idx</span>
+     <li><span class="dfn-paneled" id="9aa97c69">seq_tier</span>
+     <li><span class="dfn-paneled" id="56e458b6">sequence header obu</span>
+     <li><span class="dfn-paneled" id="6879641c">show_existing_frame</span>
+     <li><span class="dfn-paneled" id="6f2bb367">show_frame</span>
+     <li><span class="dfn-paneled" id="029d3141">subsampling_x</span>
+     <li><span class="dfn-paneled" id="1a24c071">subsampling_y</span>
+     <li><span class="dfn-paneled" id="0c507a0f">switch frame</span>
+     <li><span class="dfn-paneled" id="0f7ae3ea">temporal delimiter obu</span>
+     <li><span class="dfn-paneled" id="893e1684">temporal unit</span>
+     <li><span class="dfn-paneled" id="7c08a478">tile group obu</span>
+     <li><span class="dfn-paneled" id="da09075b">tile list obu</span>
+     <li><span class="dfn-paneled" id="48bcea1c">timing_info</span>
+     <li><span class="dfn-paneled" id="f6918f92">timing_info_present_flag</span>
     </ul>
    <li>
     <a data-link-type="biblio">[CENC]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="935be28bb2ef232ad16945b2cdb69c0f">bytesofcleardata</span>
-     <li><span class="dfn-paneled" id="0823905e938db14fa0ce9f54969cea70">bytesofprotecteddata</span>
-     <li><span class="dfn-paneled" id="2b285af7abdae2d4aab3a7cbedfdd6ab">cbcs</span>
-     <li><span class="dfn-paneled" id="742c038dd8361327983a92bd81e21859">cenc</span>
+     <li><span class="dfn-paneled" id="08bdf12f">bytesofcleardata</span>
+     <li><span class="dfn-paneled" id="7e1402cf">bytesofprotecteddata</span>
+     <li><span class="dfn-paneled" id="aea95c63">cbcs</span>
+     <li><span class="dfn-paneled" id="8d1f372c">cenc</span>
     </ul>
    <li>
     <a data-link-type="biblio">[CMAF]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="1568b5183e757fdee5323510bdd1a120">cmaf video track</span>
-     <li><span class="dfn-paneled" id="76fc7918b57ae33e76892402603c6b72">cmfc</span>
+     <li><span class="dfn-paneled" id="ce4f79c4">cmaf video track</span>
+     <li><span class="dfn-paneled" id="8e134714">cmfc</span>
     </ul>
    <li>
     <a data-link-type="biblio">[ISOBMFF]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="952f01526c87045a89015e38d1931006">bitr</span>
-     <li><span class="dfn-paneled" id="52b8fcc7cef8754159148e684a77d02e">clap</span>
-     <li><span class="dfn-paneled" id="15388b1662efccc6c0d26daa21eb8a02">clli</span>
-     <li><span class="dfn-paneled" id="6351cd1cc3bfb6561867f56587297705">colr</span>
-     <li><span class="dfn-paneled" id="1b1b183a7f9c84aa05248368ea7421ba">ctts</span>
-     <li><span class="dfn-paneled" id="295c612b69b22d9306c1004b4766efa2">iso6</span>
-     <li><span class="dfn-paneled" id="fcf81bf686786e641e169d84d6f6c84a">mdcv</span>
-     <li><span class="dfn-paneled" id="f2de67e75e1151de694a7aedeccb7e6c">nclx</span>
-     <li><span class="dfn-paneled" id="d72ed60b4c680fa6477d565e9553dd28">visualsampleentry</span>
+     <li><span class="dfn-paneled" id="fe72a98d">bitr</span>
+     <li><span class="dfn-paneled" id="d610a6f9">clap</span>
+     <li><span class="dfn-paneled" id="df22dcca">clli</span>
+     <li><span class="dfn-paneled" id="addc5c57">colr</span>
+     <li><span class="dfn-paneled" id="574e11bb">ctts</span>
+     <li><span class="dfn-paneled" id="103b0ad5">iso6</span>
+     <li><span class="dfn-paneled" id="c2257a27">mdcv</span>
+     <li><span class="dfn-paneled" id="80acadec">nclx</span>
+     <li><span class="dfn-paneled" id="62954e09">visualsampleentry</span>
     </ul>
    <li>
     <a data-link-type="biblio">[RFC6381]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="df8441526d3bbb5086bd93c1fae005b3">codecs</span>
+     <li><span class="dfn-paneled" id="05d9bbbb">codecs</span>
     </ul>
    <li>
     <a data-link-type="biblio">[VP9]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="37f26709df4ef02bccacdfb3c0626342">coll</span>
-     <li><span class="dfn-paneled" id="b459180629a753573e7c799ce3a57f45">smdm</span>
+     <li><span class="dfn-paneled" id="259a7661">coll</span>
+     <li><span class="dfn-paneled" id="fd8e2db3">smdm</span>
     </ul>
   </ul>
   <h2 class="no-num no-ref heading settled" id="references"><span class="content">References</span><a class="self-link" href="#references"></a></h2>
@@ -3174,118 +2737,68 @@ <h3 class="no-num no-ref heading settled" id="normative"><span class="content">N
    <dt id="biblio-rfc6381">[RFC6381]
    <dd>R. Gellens; D. Singer; P. Frojdh. <a href="https://www.rfc-editor.org/rfc/rfc6381"><cite>The 'Codecs' and 'Profiles' Parameters for "Bucket" Media Types</cite></a>. August 2011. Proposed Standard. URL: <a href="https://www.rfc-editor.org/rfc/rfc6381">https://www.rfc-editor.org/rfc/rfc6381</a>
   </dl>
-  <aside aria-labelledby="infopaneltitle-for-av1sampleentry" class="dfn-panel" data-for="av1sampleentry" id="infopanel-for-av1sampleentry">
-   <span id="infopaneltitle-for-av1sampleentry" style="display:none">Info about the 'AV1SampleEntry' definition.</span><b><a href="#av1sampleentry">#av1sampleentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-av1sampleentry">2.1. General Requirements &amp; Brands</a>
-    <li><a href="#ref-for-av1sampleentry①">2.2.4. Semantics</a>
-    <li><a href="#ref-for-av1sampleentry②">2.4. AV1 Sample Format</a> <a href="#ref-for-av1sampleentry③">(2)</a>
-    <li><a href="#ref-for-av1sampleentry④">3. CMAF AV1 track format</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-av1codecconfigurationbox" class="dfn-panel" data-for="av1codecconfigurationbox" id="infopanel-for-av1codecconfigurationbox">
-   <span id="infopaneltitle-for-av1codecconfigurationbox" style="display:none">Info about the 'AV1CodecConfigurationBox' definition.</span><b><a href="#av1codecconfigurationbox">#av1codecconfigurationbox</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-av1codecconfigurationbox">2.2.2. Description</a>
-    <li><a href="#ref-for-av1codecconfigurationbox①">2.2.4. Semantics</a> <a href="#ref-for-av1codecconfigurationbox②">(2)</a>
-    <li><a href="#ref-for-av1codecconfigurationbox③">2.3.4. Semantics</a> <a href="#ref-for-av1codecconfigurationbox④">(2)</a> <a href="#ref-for-av1codecconfigurationbox⑤">(3)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-high_bitdepth" class="dfn-panel" data-for="high_bitdepth" id="infopanel-for-high_bitdepth">
-   <span id="infopaneltitle-for-high_bitdepth" style="display:none">Info about the 'high_bitdepth' definition.</span><b><a href="#high_bitdepth">#high_bitdepth</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-high_bitdepth">2.3.4. Semantics</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-twelve_bit" class="dfn-panel" data-for="twelve_bit" id="infopanel-for-twelve_bit">
-   <span id="infopaneltitle-for-twelve_bit" style="display:none">Info about the 'twelve_bit' definition.</span><b><a href="#twelve_bit">#twelve_bit</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-twelve_bit">2.3.4. Semantics</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-chroma_subsampling_x" class="dfn-panel" data-for="chroma_subsampling_x" id="infopanel-for-chroma_subsampling_x">
-   <span id="infopaneltitle-for-chroma_subsampling_x" style="display:none">Info about the 'chroma_subsampling_x' definition.</span><b><a href="#chroma_subsampling_x">#chroma_subsampling_x</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-chroma_subsampling_x">2.3.4. Semantics</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-chroma_subsampling_y" class="dfn-panel" data-for="chroma_subsampling_y" id="infopanel-for-chroma_subsampling_y">
-   <span id="infopaneltitle-for-chroma_subsampling_y" style="display:none">Info about the 'chroma_subsampling_y' definition.</span><b><a href="#chroma_subsampling_y">#chroma_subsampling_y</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-chroma_subsampling_y">2.3.4. Semantics</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-chroma_sample_position" class="dfn-panel" data-for="chroma_sample_position" id="infopanel-for-chroma_sample_position">
-   <span id="infopaneltitle-for-chroma_sample_position" style="display:none">Info about the 'chroma_sample_position' definition.</span><b><a href="#chroma_sample_position">#chroma_sample_position</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-chroma_sample_position">2.3.4. Semantics</a> <a href="#ref-for-chroma_sample_position①">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-initial_presentation_delay_minus_one" class="dfn-panel" data-for="initial_presentation_delay_minus_one" id="infopanel-for-initial_presentation_delay_minus_one">
-   <span id="infopaneltitle-for-initial_presentation_delay_minus_one" style="display:none">Info about the 'initial_presentation_delay_minus_one' definition.</span><b><a href="#initial_presentation_delay_minus_one">#initial_presentation_delay_minus_one</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-initial_presentation_delay_minus_one">2.3.4. Semantics</a> <a href="#ref-for-initial_presentation_delay_minus_one①">(2)</a> <a href="#ref-for-initial_presentation_delay_minus_one②">(3)</a> <a href="#ref-for-initial_presentation_delay_minus_one③">(4)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-av1-sample" class="dfn-panel" data-for="av1-sample" id="infopanel-for-av1-sample">
-   <span id="infopaneltitle-for-av1-sample" style="display:none">Info about the 'AV1 Sample' definition.</span><b><a href="#av1-sample">#av1-sample</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-av1-sample">2.2.2. Description</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-av1forwardkeyframesamplegroupentry" class="dfn-panel" data-for="av1forwardkeyframesamplegroupentry" id="infopanel-for-av1forwardkeyframesamplegroupentry">
-   <span id="infopaneltitle-for-av1forwardkeyframesamplegroupentry" style="display:none">Info about the 'AV1ForwardKeyFrameSampleGroupEntry' definition.</span><b><a href="#av1forwardkeyframesamplegroupentry">#av1forwardkeyframesamplegroupentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-av1forwardkeyframesamplegroupentry">2.3.4. Semantics</a>
-    <li><a href="#ref-for-av1forwardkeyframesamplegroupentry①">2.4. AV1 Sample Format</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-av1multiframesamplegroupentry" class="dfn-panel" data-for="av1multiframesamplegroupentry" id="infopanel-for-av1multiframesamplegroupentry">
-   <span id="infopaneltitle-for-av1multiframesamplegroupentry" style="display:none">Info about the 'AV1MultiFrameSampleGroupEntry' definition.</span><b><a href="#av1multiframesamplegroupentry">#av1multiframesamplegroupentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-av1multiframesamplegroupentry">2.4. AV1 Sample Format</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-av1s" class="dfn-panel" data-for="av1s" id="infopanel-for-av1s">
-   <span id="infopaneltitle-for-av1s" style="display:none">Info about the 'av1s' definition.</span><b><a href="#av1s">#av1s</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-av1s">2.4. AV1 Sample Format</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-av1switchframesamplegroupentry" class="dfn-panel" data-for="av1switchframesamplegroupentry" id="infopanel-for-av1switchframesamplegroupentry">
-   <span id="infopaneltitle-for-av1switchframesamplegroupentry" style="display:none">Info about the 'AV1SwitchFrameSampleGroupEntry' definition.</span><b><a href="#av1switchframesamplegroupentry">#av1switchframesamplegroupentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-av1switchframesamplegroupentry">2.4. AV1 Sample Format</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-av1metadatasamplegroupentry" class="dfn-panel" data-for="av1metadatasamplegroupentry" id="infopanel-for-av1metadatasamplegroupentry">
-   <span id="infopaneltitle-for-av1metadatasamplegroupentry" style="display:none">Info about the 'AV1MetadataSampleGroupEntry' definition.</span><b><a href="#av1metadatasamplegroupentry">#av1metadatasamplegroupentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-av1metadatasamplegroupentry">2.4. AV1 Sample Format</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-cmaf-av1-track" class="dfn-panel" data-for="cmaf-av1-track" id="infopanel-for-cmaf-av1-track">
-   <span id="infopaneltitle-for-cmaf-av1-track" style="display:none">Info about the 'CMAF AV1 Track' definition.</span><b><a href="#cmaf-av1-track">#cmaf-av1-track</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-cmaf-av1-track">3. CMAF AV1 track format</a>
-    <li><a href="#ref-for-cmaf-av1-track①">4. Common Encryption</a>
-   </ul>
-  </aside>
-<script>/* script-dfn-panel */
+<script>/* Boilerplate: script-dfn-panel */
 "use strict";
 {
-    function queryAll(sel) {
-        return [].slice.call(document.querySelectorAll(sel));
+    const dfnsJson = window.dfnsJson || {};
+
+    function genDfnPanel({dfnID, url, dfnText, refSections, external}) {
+        return mk.aside({
+            class: "dfn-panel",
+            id: `infopanel-for-${dfnID}`,
+            "data-for": dfnID,
+            "aria-labelled-by":`infopaneltitle-for-${dfnID}`,
+            },
+            mk.span({id:`infopaneltitle-for-${dfnID}`, style:"display:none"},
+                `Info about the '${dfnText}' ${external?"external":""} reference.`),
+            mk.a({href:url}, url),
+            mk.b({}, "Referenced in:"),
+            mk.ul({},
+                ...refSections.map(section=>
+                    mk.li({},
+                        ...section.refs.map((ref, refI)=>
+                            [
+                                mk.a({
+                                    href: `#${ref.id}`
+                                    },
+                                    (refI == 0) ? section.title : `(${refI + 1})`
+                                ),
+                                " ",
+                            ]
+                        ),
+                    ),
+                ),
+            ),
+        );
+    }
+
+    function genAllDfnPanels() {
+        for(const panelData of Object.values(window.dfnpanelData)) {
+            const dfnID = panelData.dfnID;
+            const dfn = document.getElementById(dfnID);
+            if(!dfn) {
+                console.log(`Can't find dfn#${dfnID}.`, panelData);
+            } else {
+                const panel = genDfnPanel(panelData);
+                append(document.body, panel);
+                insertDfnPopupAction(dfn, panel)
+            }
+        }
     }
 
-    // Add popup behavior to all dfns to show the corresponding dfn-panel.
-    var dfns = document.querySelectorAll('.dfn-paneled');
-    for (let dfn of dfns) { insertDfnPopupAction(dfn); }
+    document.addEventListener("DOMContentLoaded", ()=>{
+        genAllDfnPanels();
+
+        // Add popup behavior to all dfns to show the corresponding dfn-panel.
+        var dfns = queryAll('.dfn-paneled');
+        for(let dfn of dfns) { ; }
+
+        document.body.addEventListener("click", (e) => {
+            // If not handled already, just hide all dfn panels.
+            hideAllDfnPanels();
+        });
+    })
 
-    document.body.addEventListener("click", (e) => {
-        // If not handled already, just hide all dfn panels.
-        hideAllDfnPanels();
-    });
 
     function hideAllDfnPanels() {
         // Turn off any currently "on" or "activated" panels.
@@ -3335,49 +2848,469 @@ <h3 class="no-num no-ref heading settled" id="normative"><span class="content">N
         }
     }
 
-    function insertDfnPopupAction(dfn) {
+    function insertDfnPopupAction(dfn, dfnPanel) {
         // Find dfn panel
-        const dfnPanel = document.querySelector(`.dfn-panel[data-for='${dfn.id}']`);
-        if (dfnPanel) {
-            const panelWrapper = document.createElement('span');
-            panelWrapper.appendChild(dfnPanel);
-            panelWrapper.style.position = "relative";
-            panelWrapper.style.height = "0px";
-            dfn.insertAdjacentElement("afterend", panelWrapper);
-            dfn.setAttribute('role', 'button');
-            dfn.setAttribute('aria-expanded', 'false')
-            dfn.tabIndex = 0;
-            dfn.classList.add('has-dfn-panel');
-            dfn.addEventListener('click', (event) => {
-                showDfnPanel(dfnPanel, dfn);
+        const panelWrapper = document.createElement('span');
+        panelWrapper.appendChild(dfnPanel);
+        panelWrapper.style.position = "relative";
+        panelWrapper.style.height = "0px";
+        dfn.insertAdjacentElement("afterend", panelWrapper);
+        dfn.setAttribute('role', 'button');
+        dfn.setAttribute('aria-expanded', 'false')
+        dfn.tabIndex = 0;
+        dfn.classList.add('has-dfn-panel');
+        dfn.addEventListener('click', (event) => {
+            showDfnPanel(dfnPanel, dfn);
+            event.stopPropagation();
+        });
+        dfn.addEventListener('keypress', (event) => {
+            const kc = event.keyCode;
+            // 32->Space, 13->Enter
+            if(kc == 32 || kc == 13) {
+                toggleDfnPanel(dfnPanel, dfn);
                 event.stopPropagation();
-            });
-            dfn.addEventListener('keypress', (event) => {
-                const kc = event.keyCode;
-                // 32->Space, 13->Enter
-                if(kc == 32 || kc == 13) {
-                    toggleDfnPanel(dfnPanel, dfn);
-                    event.stopPropagation();
-                    event.preventDefault();
-                }
-            });
-
-            dfnPanel.addEventListener('click', (event) => {
+                event.preventDefault();
+            }
+        });
+
+        dfnPanel.addEventListener('click', (event) => {
+            if (event.target.nodeName == 'A') {
                 pinDfnPanel(dfnPanel);
+            }
+            event.stopPropagation();
+        });
+
+        dfnPanel.addEventListener('keydown', (event) => {
+            if(event.keyCode == 27) { // Escape key
+                hideDfnPanel(dfnPanel, dfn);
                 event.stopPropagation();
-            });
+                event.preventDefault();
+            }
+        })
+    }
+}
+</script>
+<script>/* Boilerplate: script-dfn-panel */
+"use strict";
+{
+    const dfnsJson = window.dfnsJson || {};
+
+    function genDfnPanel({dfnID, url, dfnText, refSections, external}) {
+        return mk.aside({
+            class: "dfn-panel",
+            id: `infopanel-for-${dfnID}`,
+            "data-for": dfnID,
+            "aria-labelled-by":`infopaneltitle-for-${dfnID}`,
+            },
+            mk.span({id:`infopaneltitle-for-${dfnID}`, style:"display:none"},
+                `Info about the '${dfnText}' ${external?"external":""} reference.`),
+            mk.a({href:url}, url),
+            mk.b({}, "Referenced in:"),
+            mk.ul({},
+                ...refSections.map(section=>
+                    mk.li({},
+                        ...section.refs.map((ref, refI)=>
+                            [
+                                mk.a({
+                                    href: `#${ref.id}`
+                                    },
+                                    (refI == 0) ? section.title : `(${refI + 1})`
+                                ),
+                                " ",
+                            ]
+                        ),
+                    ),
+                ),
+            ),
+        );
+    }
+
+    function genAllDfnPanels() {
+        for(const panelData of Object.values(window.dfnpanelData)) {
+            const dfnID = panelData.dfnID;
+            const dfn = document.getElementById(dfnID);
+            if(!dfn) {
+                console.log(`Can't find dfn#${dfnID}.`, panelData);
+            } else {
+                const panel = genDfnPanel(panelData);
+                append(document.body, panel);
+                insertDfnPopupAction(dfn, panel)
+            }
+        }
+    }
+
+    document.addEventListener("DOMContentLoaded", ()=>{
+        genAllDfnPanels();
+
+        // Add popup behavior to all dfns to show the corresponding dfn-panel.
+        var dfns = queryAll('.dfn-paneled');
+        for(let dfn of dfns) { ; }
+
+        document.body.addEventListener("click", (e) => {
+            // If not handled already, just hide all dfn panels.
+            hideAllDfnPanels();
+        });
+    })
+
+
+    function hideAllDfnPanels() {
+        // Turn off any currently "on" or "activated" panels.
+        queryAll(".dfn-panel.on, .dfn-panel.activated").forEach(el=>hideDfnPanel(el));
+    }
+
+    function showDfnPanel(dfnPanel, dfn) {
+        hideAllDfnPanels(); // Only display one at this time.
+        dfn.setAttribute("aria-expanded", "true");
+        dfnPanel.classList.add("on");
+        dfnPanel.style.left = "5px";
+        dfnPanel.style.top = "0px";
+        const panelRect = dfnPanel.getBoundingClientRect();
+        const panelWidth = panelRect.right - panelRect.left;
+        if (panelRect.right > document.body.scrollWidth) {
+            // Panel's overflowing the screen.
+            // Just drop it below the dfn and flip it rightward instead.
+            // This still wont' fix things if the screen is *really* wide,
+            // but fixing that's a lot harder without 'anchor()'.
+            dfnPanel.style.top = "1.5em";
+            dfnPanel.style.left = "auto";
+            dfnPanel.style.right = "0px";
+        }
+    }
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+</script>
+<script>/* Boilerplate: script-dom-helper */
+function query(sel) { return document.querySelector(sel); }
+
+function queryAll(sel) { return [...document.querySelectorAll(sel)]; }
+
+function iter(obj) {
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+	var it = obj[Symbol.iterator];
+	if(it) return it;
+	return Object.entries(obj);
+}
+
+function mk(tagname, attrs, ...children) {
+	const el = document.createElement(tagname);
+	for(const [k,v] of iter(attrs)) {
+		if(k.slice(0,3) == "_on") {
+			const eventName = k.slice(3);
+			el.addEventListener(eventName, v);
+		} else if(k[0] == "_") {
+			// property, not attribute
+			el[k.slice(1)] = v;
+		} else {
+			if(v === false || v == null) {
+        continue;
+      } else if(v === true) {
+        el.setAttribute(k, "");
+        continue;
+      } else {
+  			el.setAttribute(k, v);
+      }
+		}
+	}
+	append(el, children);
+	return el;
+}
+
+/* Create shortcuts for every known HTML element */
+[
+  "a",
+  "abbr",
+  "acronym",
+  "address",
+  "applet",
+  "area",
+  "article",
+  "aside",
+  "audio",
+  "b",
+  "base",
+  "basefont",
+  "bdo",
+  "big",
+  "blockquote",
+  "body",
+  "br",
+  "button",
+  "canvas",
+  "caption",
+  "center",
+  "cite",
+  "code",
+  "col",
+  "colgroup",
+  "datalist",
+  "dd",
+  "del",
+  "details",
+  "dfn",
+  "dialog",
+  "div",
+  "dl",
+  "dt",
+  "em",
+  "embed",
+  "fieldset",
+  "figcaption",
+  "figure",
+  "font",
+  "footer",
+  "form",
+  "frame",
+  "frameset",
+  "head",
+  "header",
+  "h1",
+  "h2",
+  "h3",
+  "h4",
+  "h5",
+  "h6",
+  "hr",
+  "html",
+  "i",
+  "iframe",
+  "img",
+  "input",
+  "ins",
+  "kbd",
+  "label",
+  "legend",
+  "li",
+  "link",
+  "main",
+  "map",
+  "mark",
+  "meta",
+  "meter",
+  "nav",
+  "nobr",
+  "noscript",
+  "object",
+  "ol",
+  "optgroup",
+  "option",
+  "output",
+  "p",
+  "param",
+  "pre",
+  "progress",
+  "q",
+  "s",
+  "samp",
+  "script",
+  "section",
+  "select",
+  "small",
+  "source",
+  "span",
+  "strike",
+  "strong",
+  "style",
+  "sub",
+  "summary",
+  "sup",
+  "table",
+  "tbody",
+  "td",
+  "template",
+  "textarea",
+  "tfoot",
+  "th",
+  "thead",
+  "time",
+  "title",
+  "tr",
+  "u",
+  "ul",
+  "var",
+  "video",
+  "wbr",
+  "xmp",
+].forEach(tagname=>{
+	mk[tagname] = (...args) => mk(tagname, ...args);
+});
+
+function* nodesFromChildList(children) {
+	for(const child of children.flat(Infinity)) {
+		if(child instanceof Node) {
+			yield child;
+		} else {
+			yield new Text(child);
+		}
+	}
+}
+function append(el, ...children) {
+	for(const child of nodesFromChildList(children)) {
+		if(el instanceof Node) el.appendChild(child);
+		else el.push(child);
+	}
+	return el;
+}
+
+function insertAfter(el, ...children) {
+	for(const child of nodesFromChildList(children)) {
+		el.parentNode.insertBefore(child, el.nextSibling);
+	}
+	return el;
+}
+
+function clearContents(el) {
+	el.innerHTML = "";
+	return el;
+}
+
+function parseHTML(markup) {
+	if(markup.toLowerCase().trim().indexOf('<!doctype') === 0) {
+		const doc = document.implementation.createHTMLDocument("");
+		doc.documentElement.innerHTML = markup;
+		return doc;
+	} else {
+		const el = mk.template({});
+		el.innerHTML = markup;
+		return el.content;
+	}
 }
 </script>
\ No newline at end of file

From 35962730c344ee224ead1dca1c42a4f753943ab6 Mon Sep 17 00:00:00 2001
From: Dimitri Podborski <podborski@users.noreply.github.com>
Date: Mon, 27 Nov 2023 11:02:51 -0800
Subject: [PATCH 10/12] bugfix close span not p

---
 index.bs     | 28 ++++++++++++++--------------
 index_120.bs | 28 ++++++++++++++--------------
 v1.2.0.html  | 30 +++++++++++++++---------------
 3 files changed, 43 insertions(+), 43 deletions(-)

diff --git a/index.bs b/index.bs
index 30e5d11..bcd5762 100644
--- a/index.bs
+++ b/index.bs
@@ -195,8 +195,8 @@ AV1 Sample Entry {#av1sampleentry-section}
 <pre class="def">
 	Sample Entry Type: <dfn value export for="AV1SampleEntry">av01</dfn>
 	Container:         Sample Description Box ('stsd')
-	<assert>Mandatory:         Yes <span hidden>for av01</p></assert>
-	<assert>Quantity:          One or more <span hidden>for av01</p></assert>
+	<assert>Mandatory:         Yes <span hidden>for av01</span></assert>
+	<assert>Quantity:          One or more <span hidden>for av01</span></assert>
 </pre>
 
 ### Description ### {#av1sampleentry-description}
@@ -242,8 +242,8 @@ AV1 Codec Configuration Box {#av1codecconfigurationbox-section}
 <pre class="def">
 	Box Type:  <dfn export>av1C</dfn>
 	Container: AV1 Sample Entry ('av01')
-	<assert>Mandatory: Yes <span hidden>for av1C</p></assert>
-	<assert>Quantity:  Exactly One <span hidden>for av1C</p></assert>
+	<assert>Mandatory: Yes <span hidden>for av1C</span></assert>
+	<assert>Quantity:  Exactly One <span hidden>for av1C</span></assert>
 </pre>
 
 
@@ -412,8 +412,8 @@ AV1 Forward Key Frame sample group entry {#forwardkeyframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn export>av1f</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <span hidden>for av1f</p></assert>
-	<assert>Quantity:   Zero or more <span hidden>for av1f</p></assert>.
+	<assert>Mandatory:  No <span hidden>for av1f</span></assert>
+	<assert>Quantity:   Zero or more <span hidden>for av1f</span></assert>.
 </pre>
 
 ### Description ### {#forwardkeyframesamplegroupentry-description}
@@ -441,8 +441,8 @@ AV1 Multi-Frame sample group entry {#multiframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn value export for="AV1MultiFrameSampleGroupEntry">av1m</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <span hidden>for av1m</p></assert>
-	<assert>Quantity:   Zero or more <span hidden>for av1m</p></assert>.
+	<assert>Mandatory:  No <span hidden>for av1m</span></assert>
+	<assert>Quantity:   Zero or more <span hidden>for av1m</span></assert>.
 </pre>
 
 
@@ -466,8 +466,8 @@ AV1 Switch Frame sample group entry {#switchframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn export>av1s</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <span hidden>for av1s</p></assert>
-	<assert>Quantity:   Zero or more <span hidden>for av1s</p></assert>.
+	<assert>Mandatory:  No <span hidden>for av1s</span></assert>
+	<assert>Quantity:   Zero or more <span hidden>for av1s</span></assert>.
 </pre>
 
 
@@ -490,8 +490,8 @@ AV1 Metadata sample group entry {#metadatasamplegroupentry}
 <pre class="def">
 	Group Type: <dfn value noexport for="AV1MetadataSampleGroupEntry">av1M</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <span hidden>for av1M</p></assert>
-	<assert>Quantity:   Zero or more <span hidden>for av1M</p></assert>.
+	<assert>Mandatory:  No <span hidden>for av1M</span></assert>
+	<assert>Quantity:   Zero or more <span hidden>for av1M</span></assert>.
 </pre>
 
 
@@ -569,7 +569,7 @@ Within protected samples, the following constraints apply:
 	    NOTE: As a result of the above, [=BytesOfProtectedData=] is not necessarily a multiple of 16 bytes and partial blocks are included in the [=BytesOfProtectedData=] range, but per [[!CENC]] the data is not be encrypted.
 
 	    - <assert>A subsample SHALL be created for each tile, even if its size is less than 16 bytes</assert>.
-		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <span hidden>for cbcs</p></assert>.
+		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <span hidden>for cbcs</span></assert>.
 
 	- for the protected scheme <code>[=cenc=]</code>:
 	    - <assert>[=BytesOfProtectedData=] SHALL be a multiple of 16 bytes</assert>.
@@ -578,7 +578,7 @@ Within protected samples, the following constraints apply:
 
 	    NOTE: As a result of the above, partial blocks are not used and it is possible that [=BytesOfProtectedData=] does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.
 	    - <assert>A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes</assert>. <assert>If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the [=BytesOfClearData=] field of a surrounding subsample, if any</assert>.
-		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <span hidden>for cenc</p></assert>.
+		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <span hidden>for cenc</span></assert>.
 
 Subsample Encryption Illustration {#subsample-encryption-illustration}
 ------------------
diff --git a/index_120.bs b/index_120.bs
index 55d8a90..0af885e 100644
--- a/index_120.bs
+++ b/index_120.bs
@@ -198,8 +198,8 @@ AV1 Sample Entry {#av1sampleentry-section}
 <pre class="def">
 	Sample Entry Type: <dfn value export for="AV1SampleEntry">av01</dfn>
 	Container:         Sample Description Box ('stsd')
-	<assert>Mandatory:         Yes <span hidden>for av01</p></assert>
-	<assert>Quantity:          One or more <span hidden>for av01</p></assert>
+	<assert>Mandatory:         Yes <span hidden>for av01</span></assert>
+	<assert>Quantity:          One or more <span hidden>for av01</span></assert>
 </pre>
 
 ### Description ### {#av1sampleentry-description}
@@ -243,8 +243,8 @@ AV1 Codec Configuration Box {#av1codecconfigurationbox-section}
 <pre class="def">
 	Box Type:  <dfn export>av1C</dfn>
 	Container: AV1 Sample Entry ('av01')
-	<assert>Mandatory: Yes <span hidden>for av1C</p></assert>
-	<assert>Quantity:  Exactly One <span hidden>for av1C</p></assert>
+	<assert>Mandatory: Yes <span hidden>for av1C</span></assert>
+	<assert>Quantity:  Exactly One <span hidden>for av1C</span></assert>
 </pre>
 
 
@@ -411,8 +411,8 @@ AV1 Forward Key Frame sample group entry {#forwardkeyframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn export>av1f</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <span hidden>for av1f</p></assert>
-	<assert>Quantity:   Zero or more <span hidden>for av1f</p></assert>.
+	<assert>Mandatory:  No <span hidden>for av1f</span></assert>
+	<assert>Quantity:   Zero or more <span hidden>for av1f</span></assert>.
 </pre>
 
 ### Description ### {#forwardkeyframesamplegroupentry-description}
@@ -440,8 +440,8 @@ AV1 Multi-Frame sample group entry {#multiframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn value export for="AV1MultiFrameSampleGroupEntry">av1m</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <span hidden>for av1m</p></assert>
-	<assert>Quantity:   Zero or more <span hidden>for av1m</p></assert>.
+	<assert>Mandatory:  No <span hidden>for av1m</span></assert>
+	<assert>Quantity:   Zero or more <span hidden>for av1m</span></assert>.
 </pre>
 
 
@@ -465,8 +465,8 @@ AV1 Switch Frame sample group entry {#switchframesamplegroupentry}
 <pre class="def">
 	Group Type: <dfn export>av1s</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <span hidden>for av1s</p></assert>
-	<assert>Quantity:   Zero or more <span hidden>for av1s</p></assert>.
+	<assert>Mandatory:  No <span hidden>for av1s</span></assert>
+	<assert>Quantity:   Zero or more <span hidden>for av1s</span></assert>.
 </pre>
 
 
@@ -489,8 +489,8 @@ AV1 Metadata sample group entry {#metadatasamplegroupentry}
 <pre class="def">
 	Group Type: <dfn value noexport for="AV1MetadataSampleGroupEntry">av1M</dfn>
 	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <span hidden>for av1M</p></assert>
-	<assert>Quantity:   Zero or more <span hidden>for av1M</p></assert>.
+	<assert>Mandatory:  No <span hidden>for av1M</span></assert>
+	<assert>Quantity:   Zero or more <span hidden>for av1M</span></assert>.
 </pre>
 
 
@@ -568,7 +568,7 @@ Within protected samples, the following constraints apply:
 	    NOTE: As a result of the above, [=BytesOfProtectedData=] is not necessarily a multiple of 16 bytes and partial blocks are included in the [=BytesOfProtectedData=] range, but per [[!CENC]] the data is not be encrypted.
 
 	    - <assert>A subsample SHALL be created for each tile, even if its size is less than 16 bytes</assert>.
-		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <span hidden>for cbcs</p></assert>.
+		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <span hidden>for cbcs</span></assert>.
 
 	- for the protected scheme <code>[=cenc=]</code>:
 	    - <assert>[=BytesOfProtectedData=] SHALL be a multiple of 16 bytes</assert>.
@@ -577,7 +577,7 @@ Within protected samples, the following constraints apply:
 
 	    NOTE: As a result of the above, partial blocks are not used and it is possible that [=BytesOfProtectedData=] does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.
 	    - <assert>A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes</assert>. <assert>If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the [=BytesOfClearData=] field of a surrounding subsample, if any</assert>.
-		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <span hidden>for cenc</p></assert>.
+		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <span hidden>for cenc</span></assert>.
 
 Subsample Encryption Illustration {#subsample-encryption-illustration}
 ------------------
diff --git a/v1.2.0.html b/v1.2.0.html
index 8caa2de..5705066 100644
--- a/v1.2.0.html
+++ b/v1.2.0.html
@@ -1490,7 +1490,7 @@
 </style>
   <meta content="Bikeshed version 82ce88815, updated Thu Sep 7 16:33:55 2023 -0700" name="generator">
   <link href="https://aomediacodec.github.io/av1-isobmff/" rel="canonical">
-  <meta content="3d867e443685b5aa4345d8c9f5e64bd71fb7eb7d" name="document-revision">
+  <meta content="70de2437b1db361e6c883682eba91b52124bad37" name="document-revision">
 <style>/* Boilerplate: style-autolinks */
 .css.css, .property.property, .descriptor.descriptor {
     color: var(--a-normal-text);
@@ -2134,8 +2134,8 @@ <h3 class="heading settled" data-level="2.2" id="av1sampleentry-section"><span c
    <h4 class="heading settled" data-level="2.2.1" id="av1sampleentry-definition"><span class="secno">2.2.1. </span><span class="content">Definition</span><a class="self-link" href="#av1sampleentry-definition"></a></h4>
 <pre class="def">Sample Entry Type: <dfn data-dfn-for="AV1SampleEntry" data-dfn-type="value" data-export id="valdef-av1sampleentry-av01">av01<a class="self-link" href="#valdef-av1sampleentry-av01"></a></dfn>
 Container:         Sample Description Box ('stsd')
-<span id="assert-485d25aa">Mandatory:         Yes <span hidden>for av01<p></p></span></span>
-<span id="assert-e091fa3c">Quantity:          One or more <span hidden>for av01<p></p></span></span>
+<span id="assert-485d25aa">Mandatory:         Yes <span hidden>for av01</span></span>
+<span id="assert-e091fa3c">Quantity:          One or more <span hidden>for av01</span></span>
 </pre>
    <h4 class="heading settled" data-level="2.2.2" id="av1sampleentry-description"><span class="secno">2.2.2. </span><span class="content">Description</span><a class="self-link" href="#av1sampleentry-description"></a></h4>
    <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1sampleentry">AV1SampleEntry</dfn> sample entry identifies that the track contains <a data-link-type="dfn" href="#av1-sample" id="ref-for-av1-sample">AV1 Samples</a>, and uses an <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox">AV1CodecConfigurationBox</a>.</p>
@@ -2158,8 +2158,8 @@ <h3 class="heading settled" data-level="2.3" id="av1codecconfigurationbox-sectio
    <h4 class="heading settled" data-level="2.3.1" id="av1codecconfigurationbox-definition"><span class="secno">2.3.1. </span><span class="content">Definition</span><a class="self-link" href="#av1codecconfigurationbox-definition"></a></h4>
 <pre class="def">Box Type:  <dfn data-dfn-type="dfn" data-export id="av1c">av1C<a class="self-link" href="#av1c"></a></dfn>
 Container: AV1 Sample Entry ('av01')
-<span id="assert-318390e9">Mandatory: Yes <span hidden>for av1C<p></p></span></span>
-<span id="assert-a249db05">Quantity:  Exactly One <span hidden>for av1C<p></p></span></span>
+<span id="assert-318390e9">Mandatory: Yes <span hidden>for av1C</span></span>
+<span id="assert-a249db05">Quantity:  Exactly One <span hidden>for av1C</span></span>
 </pre>
    <h4 class="heading settled" data-level="2.3.2" id="av1codecconfigurationbox-description"><span class="secno">2.3.2. </span><span class="content">Description</span><a class="self-link" href="#av1codecconfigurationbox-description"></a></h4>
     <span id="assert-f875c695">The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1codecconfigurationbox">AV1CodecConfigurationBox</dfn> contains decoder configuration information that SHALL be valid for every sample that references the sample entry.</span> 
@@ -2274,8 +2274,8 @@ <h3 class="heading settled" data-level="2.5" id="forwardkeyframesamplegroupentry
    <h4 class="heading settled" data-level="2.5.1" id="forwardkeyframesamplegroupentry-definition"><span class="secno">2.5.1. </span><span class="content">Definition</span><a class="self-link" href="#forwardkeyframesamplegroupentry-definition"></a></h4>
 <pre class="def">Group Type: <dfn data-dfn-type="dfn" data-export id="av1f">av1f<a class="self-link" href="#av1f"></a></dfn>
 Container:  Sample Group Description Box ('sgpd')
-<span id="assert-b19a22ce">Mandatory:  No <span hidden>for av1f<p></p></span></span>
-<span id="assert-6de7aff7">Quantity:   Zero or more <span hidden>for av1f<p></p></span></span>.
+<span id="assert-b19a22ce">Mandatory:  No <span hidden>for av1f</span></span>
+<span id="assert-6de7aff7">Quantity:   Zero or more <span hidden>for av1f</span></span>.
 </pre>
    <h4 class="heading settled" data-level="2.5.2" id="forwardkeyframesamplegroupentry-description"><span class="secno">2.5.2. </span><span class="content">Description</span><a class="self-link" href="#forwardkeyframesamplegroupentry-description"></a></h4>
    <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</dfn> documents samples that contain a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑧">Delayed Random Access Point</a> that are followed at a given distance in the bitstream by a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑨">Key Frame Dependent Recovery Point</a>.</p>
@@ -2290,8 +2290,8 @@ <h3 class="heading settled" data-level="2.6" id="multiframesamplegroupentry"><sp
    <h4 class="heading settled" data-level="2.6.1" id="multiframesamplegroupentry-definition"><span class="secno">2.6.1. </span><span class="content">Definition</span><a class="self-link" href="#multiframesamplegroupentry-definition"></a></h4>
 <pre class="def">Group Type: <dfn data-dfn-for="AV1MultiFrameSampleGroupEntry" data-dfn-type="value" data-export id="valdef-av1multiframesamplegroupentry-av1m">av1m<a class="self-link" href="#valdef-av1multiframesamplegroupentry-av1m"></a></dfn>
 Container:  Sample Group Description Box ('sgpd')
-<span id="assert-5482ba80">Mandatory:  No <span hidden>for av1m<p></p></span></span>
-<span id="assert-35d7f2e6">Quantity:   Zero or more <span hidden>for av1m<p></p></span></span>.
+<span id="assert-5482ba80">Mandatory:  No <span hidden>for av1m</span></span>
+<span id="assert-35d7f2e6">Quantity:   Zero or more <span hidden>for av1m</span></span>.
 </pre>
    <h4 class="heading settled" data-level="2.6.2" id="multiframesamplegroupentry-description"><span class="secno">2.6.2. </span><span class="content">Description</span><a class="self-link" href="#multiframesamplegroupentry-description"></a></h4>
    <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</dfn> documents samples that contain multiple frames.</p>
@@ -2303,8 +2303,8 @@ <h3 class="heading settled" data-level="2.7" id="switchframesamplegroupentry"><s
    <h4 class="heading settled" data-level="2.7.1" id="switchframesamplegroupentry-definition"><span class="secno">2.7.1. </span><span class="content">Definition</span><a class="self-link" href="#switchframesamplegroupentry-definition"></a></h4>
 <pre class="def">Group Type: <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="av1s">av1s</dfn>
 Container:  Sample Group Description Box ('sgpd')
-<span id="assert-72c62575">Mandatory:  No <span hidden>for av1s<p></p></span></span>
-<span id="assert-731712f5">Quantity:   Zero or more <span hidden>for av1s<p></p></span></span>.
+<span id="assert-72c62575">Mandatory:  No <span hidden>for av1s</span></span>
+<span id="assert-731712f5">Quantity:   Zero or more <span hidden>for av1s</span></span>.
 </pre>
    <h4 class="heading settled" data-level="2.7.2" id="switchframesamplegroupentry-description"><span class="secno">2.7.2. </span><span class="content">Description</span><a class="self-link" href="#switchframesamplegroupentry-description"></a></h4>
    <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</dfn> documents samples that start with a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13①⓪">Switch Frame</a>.</p>
@@ -2316,8 +2316,8 @@ <h3 class="heading settled" data-level="2.8" id="metadatasamplegroupentry"><span
    <h4 class="heading settled" data-level="2.8.1" id="metadatasamplegroupentry-definition"><span class="secno">2.8.1. </span><span class="content">Definition</span><a class="self-link" href="#metadatasamplegroupentry-definition"></a></h4>
 <pre class="def">Group Type: <dfn data-dfn-for="AV1MetadataSampleGroupEntry" data-dfn-type="value" data-noexport id="valdef-av1metadatasamplegroupentry-av1m">av1M<a class="self-link" href="#valdef-av1metadatasamplegroupentry-av1m"></a></dfn>
 Container:  Sample Group Description Box ('sgpd')
-<span id="assert-b6627aa5">Mandatory:  No <span hidden>for av1M<p></p></span></span>
-<span id="assert-fa0bc954">Quantity:   Zero or more <span hidden>for av1M<p></p></span></span>.
+<span id="assert-b6627aa5">Mandatory:  No <span hidden>for av1M</span></span>
+<span id="assert-fa0bc954">Quantity:   Zero or more <span hidden>for av1M</span></span>.
 </pre>
    <h4 class="heading settled" data-level="2.8.2" id="metadatasamplegroupentry-description"><span class="secno">2.8.2. </span><span class="content">Description</span><a class="self-link" href="#metadatasamplegroupentry-description"></a></h4>
    <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</dfn> documents samples that contain <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑥">metadata OBUs</a>. The <code>grouping_type_parameter</code> can be used to identify samples containing <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑦">metadata OBUs</a> of a given type. If no <code>grouping_type_parameter</code> is provided, the sample group entry identifies samples containing <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑧">metadata OBUs</a> for which the <code>metadata_type</code> is unknown.</p>
@@ -2387,7 +2387,7 @@ <h3 class="heading settled" data-level="4.1" id="subsample-encryption"><span cla
        <p class="note" role="note"><span class="marker">NOTE:</span> As a result of the above, <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something②⑨">BytesOfProtectedData</a> is not necessarily a multiple of 16 bytes and partial blocks are included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③⓪">BytesOfProtectedData</a> range, but per <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a> the data is not be encrypted.</p>
        <ul>
         <li data-md><span id="assert-6547e5e3">A subsample SHALL be created for each tile, even if its size is less than 16 bytes</span>. 
-        <li data-md><span id="assert-68939155">All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑤">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑥">Frame OBUs</a> SHALL be unprotected <span hidden>for cbcs<p></p></span></span>. 
+        <li data-md><span id="assert-68939155">All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑤">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑥">Frame OBUs</a> SHALL be unprotected <span hidden>for cbcs</span></span>. 
        </ul>
       <li data-md>
        <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③①">cenc</a></code>:</p>
@@ -2399,7 +2399,7 @@ <h3 class="heading settled" data-level="4.1" id="subsample-encryption"><span cla
        <p class="note" role="note"><span class="marker">NOTE:</span> As a result of the above, partial blocks are not used and it is possible that <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③⑤">BytesOfProtectedData</a> does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.</p>
        <ul>
         <li data-md><span id="assert-df6aa49f">A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes</span>. <span id="assert-e145e592">If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-something③⑥">BytesOfClearData</a> field of a surrounding subsample, if any</span>. 
-        <li data-md><span id="assert-f7394188">All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑦">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑧">Frame OBUs</a> SHALL be unprotected <span hidden>for cenc<p></p></span></span>. 
+        <li data-md><span id="assert-f7394188">All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑦">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑧">Frame OBUs</a> SHALL be unprotected <span hidden>for cenc</span></span>. 
        </ul>
      </ul>
    </ul>

From cc0449c11bd5bd368f0e1976e59a69511c89170f Mon Sep 17 00:00:00 2001
From: Dimitri Podborski <podborski@users.noreply.github.com>
Date: Mon, 27 Nov 2023 11:14:17 -0800
Subject: [PATCH 11/12] changelog

---
 index.bs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/index.bs b/index.bs
index deba82d..fce9199 100644
--- a/index.bs
+++ b/index.bs
@@ -699,3 +699,4 @@ Changes since v1.2.0 release {#changelist}
 - <a href="https://github.com/AOMediaCodec/av1-isobmff/pull/175">Shorten long lines</a>
 - <a href="https://github.com/AOMediaCodec/av1-isobmff/pull/170">Update the CMAF section to mention the cmf2 brand.</a>
 - <a href="https://github.com/AOMediaCodec/av1-isobmff/pull/142">Clarify the color info in the codecs string.</a>
+- <a href="https://github.com/AOMediaCodec/av1-isobmff/pull/171">Make assert-id's unique and add them to the previous version.</a>

From 25106975b4ee426ec5c51099d8ce82f7ec66551b Mon Sep 17 00:00:00 2001
From: Dimitri Podborski <podborski@users.noreply.github.com>
Date: Mon, 11 Dec 2023 08:41:25 -0800
Subject: [PATCH 12/12] clean up

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-<pre class='metadata'>
-Title: AV1 Codec ISO Media File Format Binding
-Text Macro: SPECVERSION v1.2.0
-Status: FD
-URL: https://aomediacodec.github.io/av1-isobmff/
-Shortname: av1-isobmff
-Editor: Cyril Concolato, Netflix, cconcolato@netflix.com
-Editor: Tom Finegan, Google, tom.finegan@google.com
-Abstract: This document specifies the storage format for [[!AV1]] bitstreams in [[!ISOBMFF]] tracks as well as in [[!CMAF]] files.
-Date: 2019-12-12
-Repository: AOMediaCodec/av1-isobmff
-Group: AOM
-
-!Previously approved version: <a href="v1.1.0.html">v1.1.0</a>
-</pre>
-
-<pre class="anchors">
-url: https://www.iso.org/standard/68960.html#; spec: ISOBMFF; type: dfn;
-	text: VisualSampleEntry
-
-url: https://www.iso.org/standard/68960.html#; spec: ISOBMFF; type: property;
-	text: bitr
-	text: clap
-	text: clli
-	text: colr
-	text: ctts
-	text: iso6
-	text: mdcv
-	text: nclx
-	text: pasp
-	text: sgpd
-	text: stsd
-
-url: https://www.webmproject.org/vp9/mp4/#; spec: VP9; type: property;
-	text: SmDm
-	text: CoLL
-
-url: https://tools.ietf.org/html/rfc6381#; spec: RFC6381; type: property;
-	text: codecs
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1; spec: AV1; type: dfn;
-	text: AV1 bitstream
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39; spec: AV1; type: dfn;
-	text: OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40; spec: AV1; type: dfn;
-	text: OBU Header
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49; spec: AV1; type: dfn;
-	text: Frame Header OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41; spec: AV1; type: dfn;
-	text: Sequence Header OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46; spec: AV1; type: dfn;
-	text: Temporal Delimiter OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71; spec: AV1; type: dfn;
-	text: Tile Group OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71; spec: AV1; type: dfn;
-	text: Frame OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121; spec: AV1; type: dfn;
-	text: Tile List OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46; spec: AV1; type: dfn;
-	text: Metadata OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121; spec: AV1; type: dfn;
-	text: Redundant Frame Header OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121; spec: AV1; type: dfn;
-	text: Padding OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206; spec: AV1; type: dfn;
-	text: Random Access Point
-	text: Delayed Random Access Point
-	text: Key Frame Dependent Recovery Point
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13; spec: AV1; type: dfn
-	text: Inter Frame
-	text: Intra-only Frame
-	text: Key Frame
-	text: Switch Frame
-	text: Temporal Unit
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39; spec: AV1; type: dfn
-	text: Low Overhead Bitstream Format
-
-url: https://www.iso.org/standard/71975.html#; spec: CMAF; type: dfn;
-	text: CMAF Video Track
-	text: cmfc
-
-url: https://www.iso.org/standard/68042.html#; spec: CENC; type: dfn;
-	text: BytesOfProtectedData
-	text: BytesOfClearData
-	text: cbcs
-	text: cenc
-	text: cbc1
-	text: cens
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45; spec: AV1; type: dfn
-	text: timing_info
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44; spec: AV1; type: dfn
-	text: color_config
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2; spec: AV1; type: dfn;
-	text: buffer_removal_time
-	text: byte_alignment
-	text: frame_presentation_time
-	text: high_bitdepth
-	text: initial_display_delay_minus_1
-	text: max_frame_height_minus_1
-	text: max_frame_width_minus_1
-	text: mono_chrome
-	text: obu_has_size_field
-	text: obu_size
-	text: open_bitstream_unit
-	text: seq_level_idx
-	text: seq_profile
-	text: seq_tier
-	text: show_existing_frame
-	text: show_frame
-	text: still_picture
-	text: subsampling_x
-	text: subsampling_y
-	text: timing_info_present_flag
-	text: twelve_bit
-</pre>
-
-<pre class='biblio'>
-{
-	"AV1": {
-		"href": "https://aomediacodec.github.io/av1-spec/av1-spec.pdf",
-		"title": "AV1 Bitstream & Decoding Process Specification",
-		"status": "Standard",
-		"publisher": "AOM"
-	},
-	"CMAF": {
-		"title": "Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media",
-		"status": "Standard",
-		"publisher": "ISO",
-		"href": "https://www.iso.org/standard/71975.html"
-	},
-	"CENC": {
-		"title": "Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files",
-		"status": "Standard",
-		"publisher": "ISO",
-		"href": "https://www.iso.org/standard/68042.html"
-	}
-}
-</pre>
-
-Bitstream features overview {#bitstream-overview}
-=================================================
-An [=AV1 bitstream=] is composed of a sequence of [=OBUs=], grouped into [=Temporal Units=].
-
-OBUs are made of a 1 or 2 bytes header, identifying in particular the type of OBU, followed by an optional length field and by an optional payload, whose presence and content depend on the OBU type. Depending on its type, an OBU can carry configuration information, metadata, or coded video data.
-
-NOTE: [=Tile List OBUs=] defined in the [[!AV1]] specification are not supported in the current version of this specification. A future version of the specification may do so.
-
-Temporal Units are processed by a decoder in the order given by the bitstream. Each Temporal Unit is associated with a presentation time. Some Temporal Units may contain multiple frames to be decoded but only one is presented.
-
-NOTE: The AV1 specification defines scalability features, allowing frames from multiple layers or operating points to be present in a single temporal unit. This version of storage in ISOBMFF supports the simple storage of scalable streams in a single track, but does not specify advanced tools for handling multi-track support, layer extraction, or other scalability related use cases. A future version of the specification may do so.
-
-Frames carried in Temporal Units may have coding dependencies on frames carried previously in the same Temporal Unit or in previous Temporal Units. Frames that can be decoded without dependencies to previous frames are of two categories: [=Key Frames=] and [=Intra-only Frames=]. Frames that cannot be decoded independently are of three categories: [=Inter Frames=], [=Switch Frames=], and frames with a [=show_existing_frame=] flag set to 1.
-
-Key Frames with the [=show_frame=] flag set to 1 have the additional property that after decoding the Key Frame, all frames following the Key Frame in the bitstream can be decoded. They are called [=Random Access Points=] in [[!AV1]].
-
-Key Frames with the [=show_frame=] flag set to 0 are called [=Delayed Random Access Points=]. [=Delayed Random Access Points=] have the additional property that if a future [=Key Frame Dependent Recovery Point=] exists, all frames following that [=Key Frame Dependent Recovery Point=] can be decoded. A [=Key Frame Dependent Recovery Point=] is a frame with [=show_existing_frame=] set to 1 that refers to a previous [=Delayed Random Access Points=].
-
-Basic Encapsulation Scheme {#basic-encapsulation}
-=================================================
-
-This section describes the basic data structures used to signal encapsulation of [=AV1 bitstreams=] in [[!ISOBMFF]] containers.
-
-General Requirements & Brands {#brands}
------------------------------
-
-A file conformant to this specification satisfies the following:
-- It SHALL conform to the normative requirements of [[!ISOBMFF]]
-- It SHALL have the <dfn value export for="ISOBMFF Brand">av01</dfn> brand among the compatible brands array of the FileTypeBox
-- It SHALL contain at least one track using an [=AV1SampleEntry=]
-- It SHOULD indicate a structural ISOBMFF brand among the compatible brands array of the FileTypeBox, such as 'iso6'
-- It MAY indicate CMAF brands as specified in [[#cmaf]]
-- It MAY indicate other brands not specified in this document provided that the associated requirements do not conflict with those given in this specification
-
-Parsers SHALL support the structures required by the <code>'iso6'</code> brand and MAY support structures required by further ISOBMFF structural brands.
-
-AV1 Sample Entry {#av1sampleentry-section}
-----------------------------------
-
-### Definition ### {#av1sampleentry-definition}
-
-<pre class="def">
-	Sample Entry Type: <dfn value export for="AV1SampleEntry">av01</dfn>
-	Container:         Sample Description Box ('stsd')
-	Mandatory:         Yes
-	Quantity:          One or more.
-</pre>
-
-### Description ### {#av1sampleentry-description}
-
-The <dfn>AV1SampleEntry</dfn> sample entry identifies that the track contains [=AV1 Samples=], and uses an [=AV1CodecConfigurationBox=].
-
-### Syntax ### {#av1sampleentry-syntax}
-
-```
-class AV1SampleEntry extends VisualSampleEntry('av01') {
-  AV1CodecConfigurationBox config;
-}
-```
-
-### Semantics ### {#av1sampleentry-semantics}
-
-The <dfn noexport>width</dfn> and <dfn noexport>height</dfn> fields of the [=VisualSampleEntry=] SHALL equal the values of [=max_frame_width_minus_1=] + 1 and [=max_frame_height_minus_1=] + 1 of the [=Sequence Header OBU=] applying to the samples associated with this sample entry.
-
-The width and height in the TrackHeaderBox SHOULD equal, respectively, the maximum RenderWidth, called MaxRenderWidth, and the maximum RenderHeight, called MaxRenderHeight, of all the frames associated with this sample entry. Additionally, if MaxRenderWidth and MaxRenderHeight values do not equal respectively the [=max_frame_width_minus_1=] + 1 and [=max_frame_height_minus_1=] + 1 values of the [=Sequence Header OBU=], a PixelAspectRatioBox box SHALL be present in the sample entry and set such that
-```
-hSpacing / vSpacing = MaxRenderWidth * (max_frame_height_minus_1 + 1) /
-                              ((max_frame_width_minus_1 + 1) * MaxRenderHeight)
-```
-
-The <dfn noexport>compressorname</dfn> field of the [=VisualSampleEntry=] is an informative name. It is formatted in a fixed 32-byte field, with the first byte set to the number of bytes to be displayed, followed by that number of bytes of displayable data, followed by padding to complete 32 bytes total (including the size byte). The value "\012AOM Coding" is RECOMMENDED; the first byte is a count of the remaining bytes, here represented by \012, which (being octal 12) is decimal 10, the number of bytes in the rest of the string.
-
-NOTE: Parsers may ignore the value of the compressorname field. It is specified in this document simply for legacy and backwards compatibility reasons.
-
-The <dfn noexport>config</dfn> field SHALL contain an [=AV1CodecConfigurationBox=] that applies to the samples associated with this sample entry.
-
-NOTE: Multiple instances of [=AV1SampleEntry=] may be required when the track contains samples requiring a [=AV1CodecConfigurationBox=] with different characteristics.
-
-Optional boxes not specifically mentioned here can be present, in particular those indicated in the definition of the [=VisualSampleEntry=] in [[ISOBMFF]].
-
-AV1 Codec Configuration Box {#av1codecconfigurationbox-section}
---------------------------------------------------------
-
-### Definition ### {#av1codecconfigurationbox-definition}
-
-<pre class="def">
-	Box Type:  <dfn export>av1C</dfn>
-	Container: AV1 Sample Entry ('av01')
-	Mandatory: Yes
-	Quantity:  Exactly One
-</pre>
-
-
-### Description ### {#av1codecconfigurationbox-description}
-
-The <dfn>AV1CodecConfigurationBox</dfn> contains decoder configuration information that SHALL be valid for every sample that references the sample entry.
-
-
-### Syntax ### {#av1codecconfigurationbox-syntax}
-
-```
-class AV1CodecConfigurationBox extends Box('av1C'){
-  AV1CodecConfigurationRecord av1Config;
-}
-
-aligned (8) class AV1CodecConfigurationRecord {
-  unsigned int (1) marker = 1;
-  unsigned int (7) version = 1;
-  unsigned int (3) seq_profile;
-  unsigned int (5) seq_level_idx_0;
-  unsigned int (1) seq_tier_0;
-  unsigned int (1) high_bitdepth;
-  unsigned int (1) twelve_bit;
-  unsigned int (1) monochrome;
-  unsigned int (1) chroma_subsampling_x;
-  unsigned int (1) chroma_subsampling_y;
-  unsigned int (2) chroma_sample_position;
-  unsigned int (3) reserved = 0;
-
-  unsigned int (1) initial_presentation_delay_present;
-  if (initial_presentation_delay_present) {
-    unsigned int (4) initial_presentation_delay_minus_one;
-  } else {
-    unsigned int (4) reserved = 0;
-  }
-
-  unsigned int (8)[] configOBUs;
-}
-```
-
-### Semantics ### {#av1codecconfigurationbox-semantics}
-
-The <dfn export>marker</dfn> field SHALL be set to 1.
-
-NOTE: The marker bit ensures that the bit pattern of the first byte of the AV1CodecConfigurationRecord cannot be mistaken for an [=OBU Header=] byte.
-
-The <dfn noexport>version</dfn> field indicates the version of the AV1CodecConfigurationRecord. The value SHALL be set to 1 for AV1CodecConfigurationRecord.
-
-The <dfn export>seq_profile</dfn> field indicates the AV1 profile and SHALL be equal to the seq_profile value from the [=Sequence Header OBU=].
-
-The <dfn export>seq_level_idx_0</dfn> field indicates the value of seq_level_idx[0] found in the [=Sequence Header OBU=] and SHALL be equal to the value of seq_level_idx[0] in the [=Sequence Header OBU=].
-
-The <dfn export>seq_tier_0</dfn> field indicates the value of seq_tier[0] found in the [=Sequence Header OBU=] and SHALL be equal to the value of seq_tier[0] in the [=Sequence Header OBU=].
-
-The <dfn export>high_bitdepth</dfn> field indicates the value of the [=high_bitdepth=] flag from the [=Sequence Header OBU=].
-
-The <dfn export>twelve_bit</dfn> field indicates the value of the [=twelve_bit=] flag from the [=Sequence Header OBU=]. When twelve_bit is not present in the [=Sequence Header OBU=] the AV1CodecConfigurationRecord twelve_bit value SHALL be 0.
-
-The <dfn export>monochrome</dfn> field indicates the value of the [=mono_chrome=] flag from the [=Sequence Header OBU=].
-
-The <dfn export>chroma_subsampling_x</dfn> field indicates the [=subsampling_x=] value from the [=Sequence Header OBU=].
-
-The <dfn export>chroma_subsampling_y</dfn> field indicates the [=subsampling_y=] value from the [=Sequence Header OBU=].
-
-The <dfn export>chroma_sample_position</dfn> field indicates the [=chroma_sample_position=] value from the [=Sequence Header OBU=].
-
-When not specified in the [=Sequence Header OBU=], and not defined by the conditions specified in the [[!AV1]] [=color_config=], the values of [=chroma_subsampling_x=], [=chroma_subsampling_y=], and [=chroma_sample_position=] SHALL be 0.
-
-The <dfn export>initial_presentation_delay_present</dfn> field indicates the presence of the initial_presentation_delay_minus_one field.
-
-The <dfn>initial_presentation_delay_minus_one</dfn> field indicates the number of samples (minus one) that need to be decoded prior to starting the presentation of the first sample associated with this sample entry in order to guarantee that each sample will be decoded prior to its presentation time under the constraints of the first level value indicated by [=seq_level_idx=] in the [=Sequence Header OBU=] (in the configOBUs field or in the associated samples). More precisely, the following procedure SHALL not return any error:
-- construct a hypothetical bitstream consisting of the OBUs carried in the sample entry followed by the OBUs carried in all the samples referring to that sample entry,
-- set the first [=initial_display_delay_minus_1=] field of each [=Sequence Header OBU=] to the number of frames minus one contained in the first [=initial_presentation_delay_minus_one=] + 1 samples,
-- set the [=frame_presentation_time=] field of the frame header of each presentable frame such that it matches the presentation time difference between the sample carrying this frame and the previous sample (if it exists, 0 otherwise),
-- apply the decoder model specified in [[!AV1]] to this hypothetical bitstream using the first operating point. If <code>buffer_removal_time</code> information is present in bitstream for this operating point, the decoding schedule mode SHALL be applied, otherwise the resource availability mode SHALL be applied.
-
-NOTE: With the above procedure, when smooth presentation can be guaranteed after decoding the first sample, initial_presentation_delay_minus_one is 0.
-
-NOTE: Because the above procedure considers all OBUs in all samples associated with a sample entry, if these OBUS form multiple coded video sequences which would have different values of <code>initial_presentation_delay_minus_one</code> if considered separately, the sample entry would signal the larger value.
-
-<div class=example>
-The difference between [=initial_presentation_delay_minus_one=] and [=initial_display_delay_minus_1=] can be illustrated by considering the following example:
-```
-a b c d e f g h
-```
-where letters correspond to frames. Assume that <code>[=initial_display_delay_minus_1=]</code> is 2, i.e. that once frame <code>c</code> has been decoded, all other frames in the bitstream can be presented on time. If those frames were grouped into temporal units and samples as follows:
-```
-[a] [b c d] [e] [f] [g] [h]
-```
-<code>[=initial_presentation_delay_minus_one=]</code> would be 1 because it takes presentation of 2 samples to ensure that <code>c</code> is decoded.
-But if the frames were grouped as follows:
-```
-[a] [b] [c] [d e f] [g] [h]
-```
-<code>[=initial_presentation_delay_minus_one=]</code> would be 2 because it takes presentation of 3 samples to ensure that <code>c</code> is decoded.
-</div>
-
-The <dfn export>configOBUs</dfn> field contains zero or more OBUs. Any OBU may be present provided that the following procedures produce compliant AV1 bitstreams:
-- From any sync sample, an AV1 bitstream is formed by first outputting the OBUs contained in the [=AV1CodecConfigurationBox=] and then by outputing all OBUs in the samples themselves, in order, starting from the sync sample.
-- From any sample marked with the [=AV1ForwardKeyFrameSampleGroupEntry=], an AV1 bitstream is formed by first outputting the OBUs contained in the [=AV1CodecConfigurationBox=] and then by outputing all OBUs in the sample itself, then by outputting all OBUs in the samples, in order, starting from the sample at the distance indicated by the sample group.
-
-Additionally, the configOBUs field SHALL contain at most one [=Sequence Header OBU=] and if present, it SHALL be the first OBU.
-
-NOTE: The configOBUs field is expected to contain only one [=Sequence Header OBU=] and zero or more [=Metadata OBUs=] when applicable to all the associated samples.
-
-OBUs stored in the configOBUs field follow the [=open_bitstream_unit=] [=Low Overhead Bitstream Format=] syntax as specified in [[!AV1]]. The flag [=obu_has_size_field=] SHALL be set to 1, indicating that the size of the OBU payload follows the header, and that it is coded using LEB128.
-
-When a [=Sequence Header OBU=] is contained within the configOBUs of the AV1CodecConfigurationRecord, the values present in the [=Sequence Header OBU=] contained within configOBUs SHALL match the values of the AV1CodecConfigurationRecord.
-
-The presentation times of AV1 samples are given by the ISOBMFF structures. The [=timing_info_present_flag=] in the [=Sequence Header OBU=] (in the configOBUs field or in the associated samples) SHOULD be set to 0. If set to 1, the [=timing_info=] structure of the [=Sequence Header OBU=], the [=frame_presentation_time=] and [=buffer_removal_time=] fields of the [=Frame Header OBUs=], if present, SHALL be ignored for the purpose of timed processing of the ISOBMFF file.
-
-The sample entry SHOULD contain a 'colr' box with a colour_type set to 'nclx'. If present, the values of colour_primaries, transfer_characteristics, and matrix_coefficients SHALL match the values given in the [=Sequence Header OBU=] (in the configOBUs field or in the associated samples) if the color_description_present_flag is set to 1. Similarly, the full_range_flag in the 'colr' box shall match the color_range flag in the [=Sequence Header OBU=]. When configOBUs does not contain a [=Sequence Header OBU=], this box with colour_type set to 'nclx' SHALL be present.
-
-The CleanApertureBox 'clap' SHOULD not be present.
-
-For sample entries corresponding to HDR content, the MasteringDisplayColourVolumeBox 'mdcv' and ContentLightLevelBox 'clli' SHOULD be present, and their values SHALL match the values of contained in the [=Metadata OBUs=] of type METADATA_TYPE_HDR_CLL and METADATA_TYPE_HDR_MDCV, if present (in the configOBUs or in the samples).
-
-NOTE: The MasteringDisplayColourVolumeBox 'mdcv' and ContentLightLevelBox 'clli' have identical syntax to the SMPTE2086MasteringDisplayMetadataBox 'SmDm' and ContentLightLevelBox 'CoLL', except that they are of type <code>Box</code> and not <code>FullBox</code>. However, the semantics of the MasteringDisplayColourVolumeBox and SMPTE2086MasteringDisplayMetadataBox have important differences and should not be confused.
-
-Additional boxes may be provided at the end of the [=VisualSampleEntry=] as permitted by ISOBMFF, that may represent redundant or similar information to the one provided in some OBUs contained in the [=AV1CodecConfigurationBox=]. If the box definition does not indicate that its information overrides the OBU information, in case of conflict, the OBU information should be considered authoritative.
-
-AV1 Sample Format {#sampleformat}
----------------------------------
-
-For tracks using the [=AV1SampleEntry=], an <dfn>AV1 Sample</dfn> has the following constraints:
-- the sample data SHALL be a sequence of [=OBUs=] forming a [=Temporal Unit=],
-- each OBU SHALL follow the [=open_bitstream_unit=] [=Low Overhead Bitstream Format=] syntax as specified in [[!AV1]]. Each OBU SHALL have the [=obu_has_size_field=] set to 1 except for the last OBU in the sample, for which [=obu_has_size_field=] MAY be set to 0, in which case it is assumed to fill the remainder of the sample,
-
-NOTE: When extracting OBUs from an ISOBMFF file, and depending on the capabilities of the decoder processing these OBUs, ISOBMFF parsers MAY need to either: set the [=obu_has_size_field=] to 1 for some OBUs if not already set, add the size field in this case, and add [=Temporal Delimiter OBU=]; or use the length-delimited bitstream format as defined in Annex B of [=AV1=]. If encryption is used, similar operations MAY have to be done before or after decryption depending on the demuxer/decryptor/decoder architecture.
-
-- OBU trailing bits SHOULD be limited to byte alignment and SHOULD not be used for padding,
-- OBUs of type OBU_TEMPORAL_DELIMITER, OBU_PADDING, or OBU_REDUNDANT_FRAME_HEADER SHOULD NOT be used.
-- OBUs of type OBU_TILE_LIST SHALL NOT be used.
-
-If an AV1 Sample is signaled as a sync sample (in the SyncSampleBox or by setting sample_is_non_sync_sample to 0), it SHALL be a Random Access Point as defined in [[!AV1]], i.e. satisfy the following constraints:
-- Its first frame is a [=Key Frame=] that has [=show_frame=] flag set to 1,
-- It contains a [=Sequence Header OBU=] before the first [=Frame Header OBU=].
-
-NOTE: Within this definition, a sync sample may contain additional frames that are not Key Frames. The fact that none of them is the first frame in the temporal unit ensures that they are decodable.
-
-NOTE: Other types of OBUs such as [=metadata OBUs=] could be present before the [=Sequence Header OBU=].
-
-[=Intra-only frames=] SHOULD be signaled using the sample_depends_on flag set to 2.
-
-[=Delayed Random Access Points=] SHOULD be signaled using sample groups and the [=AV1ForwardKeyFrameSampleGroupEntry=].
-
-[=Switch Frames=] SHOULD be signaled using sample groups and the [=AV1SwitchFrameSampleGroupEntry=].
-
-Additionally, if a file contains multiple tracks that are alternative representations of the same content, in particular using [=Switch Frames=], those tracks SHOULD be marked as belonging to the same alternate group and should use a track selection box with an appropriate attribute (e.g. 'bitr').
-
-In tracks using the [=AV1SampleEntry=], the 'ctts' box and composition offsets in movie fragments SHALL NOT be used. Similarly, the is_leading flag, if used, SHALL be set to 0 or 2.
-
-When a temporal unit contains more than one frame, the sample corresponding to that temporal unit MAY be marked using the [=AV1MultiFrameSampleGroupEntry=].
-
-[=Metadata OBUs=] may be carried in sample data. In this case, the [=AV1MetadataSampleGroupEntry=] SHOULD be used. If the [=metadata OBUs=] are static for the entire set of samples associated with a given sample description entry, they SHOULD also be in the OBU array in the sample description entry.
-
-Unless explicitely stated, the grouping_type_parameter is not defined for the SampleToGroupBox with grouping types defined in this specification.
-
-AV1 Forward Key Frame sample group entry {#forwardkeyframesamplegroupentry}
-----------------------------------------------------------------
-
-### Definition ### {#forwardkeyframesamplegroupentry-definition}
-
-<pre class="def">
-	Group Type: <dfn export>av1f</dfn>
-	Container:  Sample Group Description Box ('sgpd')
-	Mandatory:  No
-	Quantity:   Zero or more.
-</pre>
-
-### Description ### {#forwardkeyframesamplegroupentry-description}
-
-The <dfn>AV1ForwardKeyFrameSampleGroupEntry</dfn> documents samples that contain a [=Delayed Random Access Point=] that are followed at a given distance in the bitstream by a [=Key Frame Dependent Recovery Point=].
-
-
-### Syntax ### {#forwardkeyframesamplegroupentry-syntax}
-
-```
-class AV1ForwardKeyFrameSampleGroupEntry extends VisualSampleGroupEntry('av1f') {
-  unsigned int(8) fwd_distance;
-}
-```
-
-### Semantics ### {#forwardkeyframesamplegroupentry-semantics}
-
-The <dfn export>fwd_distance</dfn> field indicates the number of samples between this sample and the next sample containing the associated [=Key Frame Dependent Recovery Point=]. 0 means the next sample.
-
-AV1 Multi-Frame sample group entry {#multiframesamplegroupentry}
-----------------------------------------------------------------
-
-### Definition ### {#multiframesamplegroupentry-definition}
-
-<pre class="def">
-	Group Type: <dfn value export for="AV1MultiFrameSampleGroupEntry">av1m</dfn>
-	Container:  Sample Group Description Box ('sgpd')
-	Mandatory:  No
-	Quantity:   Zero or more.
-</pre>
-
-
-### Description ### {#multiframesamplegroupentry-description}
-
-The <dfn>AV1MultiFrameSampleGroupEntry</dfn> documents samples that contain multiple frames.
-
-
-### Syntax ### {#multiframesamplegroupentry-syntax}
-
-```
-class AV1MultiFrameSampleGroupEntry extends VisualSampleGroupEntry('av1m') {
-}
-```
-
-AV1 Switch Frame sample group entry {#switchframesamplegroupentry}
--------------------------------------------------------
-
-### Definition ### {#switchframesamplegroupentry-definition}
-
-<pre class="def">
-	Group Type: <dfn export>av1s</dfn>
-	Container:  Sample Group Description Box ('sgpd')
-	Mandatory:  No
-	Quantity:   Zero or more.
-</pre>
-
-
-### Description ### {#switchframesamplegroupentry-description}
-
-The <dfn>AV1SwitchFrameSampleGroupEntry</dfn> documents samples that start with a [=Switch Frame=].
-
-### Syntax ### {#switchframesamplegroupentry-syntax}
-
-```
-class AV1SwitchFrameSampleGroupEntry extends VisualSampleGroupEntry('av1s') {
-}
-```
-
-AV1 Metadata sample group entry {#metadatasamplegroupentry}
------------------------------------------------------------
-
-### Definition ### {#metadatasamplegroupentry-definition}
-
-<pre class="def">
-	Group Type: <dfn value noexport for="AV1MetadataSampleGroupEntry">av1M</dfn>
-	Container:  Sample Group Description Box ('sgpd')
-	Mandatory:  No
-	Quantity:   Zero or more.
-</pre>
-
-
-### Description ### {#metadatasamplegroupentry-description}
-
-The <dfn>AV1MetadataSampleGroupEntry</dfn> documents samples that contain [=metadata OBUs=]. The <code>grouping_type_parameter</code> can be used to identify samples containing [=metadata OBUs=] of a given type. If no <code>grouping_type_parameter</code> is provided, the sample group entry identifies samples containing [=metadata OBUs=] for which the <code>metadata_type</code> is unknown.
-
-### Syntax ### {#metadatasamplegroupentry-syntax}
-
-```
-class AV1MetadataSampleGroupEntry extends VisualSampleGroupEntry('av1M') {
-}
-```
-
-For this sample group entry, the <code>grouping_type_parameter</code> syntax is as follows:
-
-```
-{
-   unsigned int (8) metadata_type;
-   unsigned int (24) metadata_specific_parameters;
-}
-```
-
-### Semantics ### {#metadatasamplegroupentry-semantics}
-
-<dfn export>metadata_type</dfn> is a 8-bit field whose value is the value of the metadata_type field defined in [[!AV1]], when it is equal or lower than 255. metadata_type values above 255 are not supported by this sample group.
-
-<dfn export>metadata_specific_parameters</dfn> provides an additional part of the <code>grouping_type_parameter</code>, which MAY be used to distinguish different sample groups having the same <code>metadata_type</code> but different sub-parameters. In this version of the specification, <code>metadata_specific_parameters</code> is only defined when <code>metadata_type</code> is set to <code>METADATA_TYPE_ITUT_T35</code> in which case its value SHALL be set to the first 24 bits of the <code>metadata_itut_t35</code> structure. For other types of metadata, its value SHOULD be set to 0. In all cases, when the <code>grouping_type_parameter</code> is used, readers processing sample groups SHALL use the entire value of <code>grouping_type_parameter</code>.
-
-CMAF AV1 track format {#cmaf}
-=====================================================
-
-[[CMAF]] defines structural constraints on ISOBMFF files additional to [[ISOBMFF]] for the purpose of, for example, adaptive streaming or for protected files. Conformance to these structural constraints is signaled by the presence of the brand <code>[=cmfc=]</code> in the <code>FileTypeBox</code>.
-
-If a [=CMAF Video Track=] uses the brand <code>av01</code>, it is called a <dfn>CMAF AV1 Track</dfn> and the following constraints, defining the CMAF Media Profile for AV1, apply:
-- it SHALL use an [=AV1SampleEntry=]
-- it MAY use multiple sample entries, and in that case the following values SHALL not change in the track:
-    - <code>seq_profile</code>
-    - <code>still_picture</code>
-    - the first value of <code>seq_level_idx</code>
-    - the first value of <code>seq_tier</code>
-    - <code>color_config</code>
-    - <code>initial_presentation_delay_minus_one</code>
-
-When protected, [=CMAF AV1 Tracks=] SHALL use the signaling defined in [[!CMAF]], which in turn relies on [[!CENC]], with the provisions specified in [[#CommonEncryption]].
-
-Common Encryption {#CommonEncryption}
-=========================
-
-[=CMAF AV1 Tracks=] and non-segmented AV1 files MAY be protected. If protected, they SHALL conform to [[!CENC]]. Files SHOULD be protected using the <code>[=cbcs=]</code> protection scheme and MAY be protected using the <code>[=cenc=]</code> protection scheme.
-
-When the protected scheme <code>[=cenc=]</code> is used, samples SHALL be protected using subsample encryption and SHALL NOT use pattern encryption.
-
-When the protected scheme <code>[=cbcs=]</code> is used, samples SHALL be protected using subsample encryption and SHALL use pattern encryption. [[!CENC]] recommends that the Block Pattern length be 10, i.e. <code>crypt_byte_block + skip_byte_block = 10</code>, where a Block is of size 16-bytes. In this specification, the combination of <code>crypt_byte_block</code> and <code>skip_byte_block</code> SHALL be one of the following, with the first one being recommended:
-- <code>crypt_byte_block = 1</code> and <code>skip_byte_block = 9</code>,
-- <code>crypt_byte_block = 5</code> and <code>skip_byte_block = 5</code>,
-- <code>crypt_byte_block = 10</code> and <code>skip_byte_block = 0</code>.
-
-
-General Subsample Encryption constraints {#subsample-encryption}
---------------------------------------
-
-Within protected samples, the following constraints apply:
-- Protected samples SHALL be exactly spanned by one or more contiguous subsamples.
-	- An OBU MAY be spanned by one or more subsamples, especially when it has multiple ranges of protected data. However, as recommended in [[!CENC]], writers SHOULD reduce the number of subsamples as possible. This can be achieved by using a subsample that spans multiple consecutive unprotected OBUs as well as the first unprotected and protected parts of the following protected OBU, if such protected OBU exists.
-	- A large unprotected OBU whose data size is larger than the maximum size of a single [=BytesOfClearData=] field MAY be spanned by multiple subsamples with zero size [=BytesOfProtectedData=].
-
-- All [=OBU Headers=] and associated [=obu_size=] fields SHALL be unprotected.
-- [=Temporal Delimiter OBUs=], [=Sequence Header OBUs=], and [=Frame Header OBUs=] (including within a [=Frame OBU=]), [=Redundant Frame Header OBUs=] and [=Padding OBUs=] SHALL be unprotected.
-- [=Metadata OBUs=] MAY be protected.
-- [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be protected. Within [=Tile Group OBUs=] or [=Frame OBUs=], the following applies:
-	- for the protected scheme <code>[=cbcs=]</code>:
-		- [=BytesOfProtectedData=] SHALL start on the first byte and end on the last byte of the <code>decode_tile</code> structure (including any trailing bits).
-
-	    NOTE: As a result of the above, [=BytesOfProtectedData=] is not necessarily a multiple of 16 bytes and partial blocks are included in the [=BytesOfProtectedData=] range, but per [[!CENC]] the data is not be encrypted.
-
-	    - A subsample SHALL be created for each tile, even if its size is less than 16 bytes.
-		- All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected.
-
-	- for the protected scheme <code>[=cenc=]</code>:
-	    - [=BytesOfProtectedData=] SHALL be a multiple of 16 bytes.
-	    - [=BytesOfProtectedData=] SHALL end on the last byte of the <code>decode_tile</code> structure (including any trailing bits).
-	    - [=BytesOfProtectedData=] SHALL span all complete 16-byte blocks of the <code>decode_tile</code> structure (including any trailing bits).
-
-	    NOTE: As a result of the above, partial blocks are not used and it is possible that [=BytesOfProtectedData=] does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.
-	    - A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes. If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the [=BytesOfClearData=] field of a surrounding subsample, if any.
-		- All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected.
-
-Subsample Encryption Illustration {#subsample-encryption-illustration}
-------------------
-Figure #1 illustrates Subsample based encryption of AV1.
-
-<figure>
-<img alt="Subsample-based AV1 encryption" src="images/subsample_encryption.svg">
-<figcaption>Subsample-based AV1 encryption.</figcaption>
-</figure>
-
-Codecs Parameter String {#codecsparam}
-======================================
-
-DASH and other applications require defined values for the 'Codecs' parameter specified in [[!RFC6381]] for ISO Media tracks. The codecs parameter string for the AOM AV1 codec is as follows:
-```
-<sample entry 4CC>.<profile>.<level><tier>.<bitDepth>.<monochrome>.<chromaSubsampling>.
-<colorPrimaries>.<transferCharacteristics>.<matrixCoefficients>.<videoFullRangeFlag>
-```
-
-All fields following the sample entry 4CC are expressed as double digit decimals, unless indicated otherwise. Leading or trailing zeros cannot be omitted.
-
-The profile parameter value, represented by a single digit decimal, SHALL equal the value of seq_profile in the [=Sequence Header OBU=].
-
-The level parameter value SHALL equal the first level value indicated by [=seq_level_idx=] in the [=Sequence Header OBU=].
-
-The tier parameter value SHALL be equal to <code>M</code> when the first [=seq_tier=] value in the [=Sequence Header OBU=] is equal to 0, and <code>H</code> when it is equal to 1.
-
-The bitDepth parameter value SHALL equal the value of BitDepth variable as defined in [[AV1]] derived from the [=Sequence Header OBU=].
-
-The monochrome parameter value, represented by a single digit decimal, SHALL equal the value of mono_chrome in the [=Sequence Header OBU=].
-
-The chromaSubsampling parameter value, represented by a three-digit decimal, SHALL have its first digit equal to subsampling_x and its second digit equal to subsampling_y. If both subsampling_x and subsampling_y are set to 1, then the third digit SHALL be equal to chroma_sample_position, otherwise it SHALL be set to 0.
-
-The colorPrimaries, transferCharacteristics, matrixCoefficients, and videoFullRangeFlag parameter values SHALL equal the value of matching fields in the [=Sequence Header OBU=], if color_description_present_flag is set to 1, otherwise they SHOULD not be set, defaulting to the values below. The videoFullRangeFlag is represented by a single digit.
-
-For example, codecs="av01.0.04M.10.0.112.09.16.09.0" represents AV1 Main Profile, level 3.0, Main tier, 10-bit content, non-monochrome, with 4:2:0 chroma subsampling co-located with (0, 0) luma sample, ITU-R BT.2100 color primaries, ITU-R BT.2100 PQ transfer characteristics, ITU-R BT.2100 YCbCr color matrix, and studio swing representation.
-
-The parameters sample entry 4CC, profile, level, tier, and bitDepth are all mandatory fields. If any of these fields are empty, or not within their allowed range, the processing device SHOULD treat it as an error.
-
-All the other fields (including their leading '.') are optional, mutually inclusive (all or none) fields. If not specified then the values listed in the table below are assumed.
-
-<table class="def">
-<tr>
-<td>mono_chrome</td><td>0</td>
-</tr>
-<tr>
-<td>chromaSubsampling</td><td>110 (4:2:0)</td>
-</tr>
-<tr>
-<td>colorPrimaries</td><td>1 (ITU-R BT.709)</td>
-</tr>
-<tr>
-<td>transferCharacteristics</td><td>1 (ITU-R BT.709)</td>
-</tr>
-<tr>
-<td>matrixCoefficients</td><td>1 (ITU-R BT.709)</td>
-</tr>
-<tr>
-<td>videoFullRangeFlag</td><td>0 (studio swing representation)</td>
-</tr>
-</table>
-
-The string codecs="av01.0.01M.08" in this case would represent AV1 Main Profile, level 2.1, Main tier, 8-bit content with 4:2:0 chroma subsampling, ITU-R BT.709 color primaries, transfer characteristics, matrix coefficients, and studio swing representation.
-
-If any character that is not '.', digits, part of the AV1 4CC, or a tier value is encountered, the string SHALL be interpreted ignoring all the characters starting from that character.
-
-Changes since v1.1.0 release {#changelist}
-==========================================
-- <a href="https://github.com/AOMediaCodec/av1-isobmff/pull/116"> Change tile/subsample alignement for the <code>cbcs</code> protection scheme.</a>
-
-
diff --git a/index_120.bs b/index_120.bs
deleted file mode 100644
index 0af885e..0000000
--- a/index_120.bs
+++ /dev/null
@@ -1,651 +0,0 @@
-<pre class='metadata'>
-Title: AV1 Codec ISO Media File Format Binding
-Text Macro: SPECVERSION v1.2.0
-Status: FD
-URL: https://aomediacodec.github.io/av1-isobmff/
-Shortname: av1-isobmff
-Editor: Cyril Concolato, Netflix, cconcolato@netflix.com
-Editor: Tom Finegan, Google, tom.finegan@google.com
-Abstract: This document specifies the storage format for [[!AV1]] bitstreams in [[!ISOBMFF]] tracks as well as in [[!CMAF]] files.
-Date: 2019-12-12
-Repository: AOMediaCodec/av1-isobmff
-Group: AOM
-
-!Previously approved version: <a href="v1.1.0.html">v1.1.0</a>
-</pre>
-
-<pre class="anchors">
-url: https://www.iso.org/standard/68960.html#; spec: ISOBMFF; type: dfn;
-	text: VisualSampleEntry
-
-url: https://www.iso.org/standard/68960.html#; spec: ISOBMFF; type: property;
-	text: bitr
-	text: clap
-	text: clli
-	text: colr
-	text: ctts
-	text: iso6
-	text: mdcv
-	text: nclx
-	text: pasp
-	text: sgpd
-	text: stsd
-
-url: https://www.webmproject.org/vp9/mp4/#; spec: VP9; type: property;
-	text: SmDm
-	text: CoLL
-
-url: https://tools.ietf.org/html/rfc6381#; spec: RFC6381; type: property;
-	text: codecs
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1; spec: AV1; type: dfn;
-	text: AV1 bitstream
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39; spec: AV1; type: dfn;
-	text: OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40; spec: AV1; type: dfn;
-	text: OBU Header
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49; spec: AV1; type: dfn;
-	text: Frame Header OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41; spec: AV1; type: dfn;
-	text: Sequence Header OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46; spec: AV1; type: dfn;
-	text: Temporal Delimiter OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71; spec: AV1; type: dfn;
-	text: Tile Group OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71; spec: AV1; type: dfn;
-	text: Frame OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121; spec: AV1; type: dfn;
-	text: Tile List OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46; spec: AV1; type: dfn;
-	text: Metadata OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121; spec: AV1; type: dfn;
-	text: Redundant Frame Header OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121; spec: AV1; type: dfn;
-	text: Padding OBU
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206; spec: AV1; type: dfn;
-	text: Random Access Point
-	text: Delayed Random Access Point
-	text: Key Frame Dependent Recovery Point
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13; spec: AV1; type: dfn
-	text: Inter Frame
-	text: Intra-only Frame
-	text: Key Frame
-	text: Switch Frame
-	text: Temporal Unit
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39; spec: AV1; type: dfn
-	text: Low Overhead Bitstream Format
-
-url: https://www.iso.org/standard/71975.html#; spec: CMAF; type: dfn;
-	text: CMAF Video Track
-	text: cmfc
-
-url: https://www.iso.org/standard/68042.html#; spec: CENC; type: dfn;
-	text: BytesOfProtectedData
-	text: BytesOfClearData
-	text: cbcs
-	text: cenc
-	text: cbc1
-	text: cens
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45; spec: AV1; type: dfn
-	text: timing_info
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44; spec: AV1; type: dfn
-	text: color_config
-
-url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2; spec: AV1; type: dfn;
-	text: buffer_removal_time
-	text: byte_alignment
-	text: frame_presentation_time
-	text: high_bitdepth
-	text: initial_display_delay_minus_1
-	text: max_frame_height_minus_1
-	text: max_frame_width_minus_1
-	text: mono_chrome
-	text: obu_has_size_field
-	text: obu_size
-	text: open_bitstream_unit
-	text: seq_level_idx
-	text: seq_profile
-	text: seq_tier
-	text: show_existing_frame
-	text: show_frame
-	text: still_picture
-	text: subsampling_x
-	text: subsampling_y
-	text: timing_info_present_flag
-	text: twelve_bit
-</pre>
-
-<pre class='biblio'>
-{
-	"AV1": {
-		"href": "https://aomediacodec.github.io/av1-spec/av1-spec.pdf",
-		"title": "AV1 Bitstream & Decoding Process Specification",
-		"status": "Standard",
-		"publisher": "AOM"
-	},
-	"CMAF": {
-		"title": "Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media",
-		"status": "Standard",
-		"publisher": "ISO",
-		"href": "https://www.iso.org/standard/71975.html"
-	},
-	"CENC": {
-		"title": "Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files",
-		"status": "Standard",
-		"publisher": "ISO",
-		"href": "https://www.iso.org/standard/68042.html"
-	}
-}
-</pre>
-
-Bitstream features overview {#bitstream-overview}
-=================================================
-An [=AV1 bitstream=] is composed of a sequence of [=OBUs=], grouped into [=Temporal Units=].
-
-OBUs are made of a 1 or 2 bytes header, identifying in particular the type of OBU, followed by an optional length field and by an optional payload, whose presence and content depend on the OBU type. Depending on its type, an OBU can carry configuration information, metadata, or coded video data.
-
-NOTE: [=Tile List OBUs=] defined in the [[!AV1]] specification are not supported in the current version of this specification. A future version of the specification may do so.
-
-Temporal Units are processed by a decoder in the order given by the bitstream. Each Temporal Unit is associated with a presentation time. Some Temporal Units may contain multiple frames to be decoded but only one is presented.
-
-NOTE: The AV1 specification defines scalability features, allowing frames from multiple layers or operating points to be present in a single temporal unit. This version of storage in ISOBMFF supports the simple storage of scalable streams in a single track, but does not specify advanced tools for handling multi-track support, layer extraction, or other scalability related use cases. A future version of the specification may do so.
-
-Frames carried in Temporal Units may have coding dependencies on frames carried previously in the same Temporal Unit or in previous Temporal Units. Frames that can be decoded without dependencies to previous frames are of two categories: [=Key Frames=] and [=Intra-only Frames=]. Frames that cannot be decoded independently are of three categories: [=Inter Frames=], [=Switch Frames=], and frames with a [=show_existing_frame=] flag set to 1.
-
-Key Frames with the [=show_frame=] flag set to 1 have the additional property that after decoding the Key Frame, all frames following the Key Frame in the bitstream can be decoded. They are called [=Random Access Points=] in [[!AV1]].
-
-Key Frames with the [=show_frame=] flag set to 0 are called [=Delayed Random Access Points=]. [=Delayed Random Access Points=] have the additional property that if a future [=Key Frame Dependent Recovery Point=] exists, all frames following that [=Key Frame Dependent Recovery Point=] can be decoded. A [=Key Frame Dependent Recovery Point=] is a frame with [=show_existing_frame=] set to 1 that refers to a previous [=Delayed Random Access Points=].
-
-Basic Encapsulation Scheme {#basic-encapsulation}
-=================================================
-
-This section describes the basic data structures used to signal encapsulation of [=AV1 bitstreams=] in [[!ISOBMFF]] containers.
-
-General Requirements & Brands {#brands}
------------------------------
-
-A file conformant to this specification satisfies the following:
-- <assert>It SHALL conform to the normative requirements of [[!ISOBMFF]]</assert>
-- <assert>It SHALL have the <dfn value export for="ISOBMFF Brand">av01</dfn> brand among the compatible brands array of the FileTypeBox</assert>
-- <assert>It SHALL contain at least one track using an [=AV1SampleEntry=]</assert>
-- <assert>It SHOULD indicate a structural ISOBMFF brand among the compatible brands array of the FileTypeBox, such as 'iso6'</assert>
-- <assert>It MAY indicate CMAF brands as specified in [[#cmaf]]</assert>
-- <assert>It MAY indicate other brands not specified in this document provided that the associated requirements do not conflict with those given in this specification</assert>
-
-Parsers SHALL support the structures required by the <code>'iso6'</code> brand and MAY support structures required by further ISOBMFF structural brands.
-
-AV1 Sample Entry {#av1sampleentry-section}
-----------------------------------
-
-### Definition ### {#av1sampleentry-definition}
-
-<pre class="def">
-	Sample Entry Type: <dfn value export for="AV1SampleEntry">av01</dfn>
-	Container:         Sample Description Box ('stsd')
-	<assert>Mandatory:         Yes <span hidden>for av01</span></assert>
-	<assert>Quantity:          One or more <span hidden>for av01</span></assert>
-</pre>
-
-### Description ### {#av1sampleentry-description}
-
-The <dfn>AV1SampleEntry</dfn> sample entry identifies that the track contains [=AV1 Samples=], and uses an [=AV1CodecConfigurationBox=].
-
-### Syntax ### {#av1sampleentry-syntax}
-
-```
-class AV1SampleEntry extends VisualSampleEntry('av01') {
-  AV1CodecConfigurationBox config;
-}
-```
-
-### Semantics ### {#av1sampleentry-semantics}
-
-<assert>The <dfn noexport>width</dfn> and <dfn noexport>height</dfn> fields of the [=VisualSampleEntry=] SHALL equal the values of [=max_frame_width_minus_1=] + 1 and [=max_frame_height_minus_1=] + 1 of the [=Sequence Header OBU=] applying to the samples associated with this sample entry.</assert>
-
-<assert>The width and height in the TrackHeaderBox SHOULD equal, respectively, the maximum RenderWidth, called MaxRenderWidth, and the maximum RenderHeight, called MaxRenderHeight, of all the frames associated with this sample entry.</assert>
-<assert>Additionally, if MaxRenderWidth and MaxRenderHeight values do not equal respectively the [=max_frame_width_minus_1=] + 1 and [=max_frame_height_minus_1=] + 1 values of the [=Sequence Header OBU=], a PixelAspectRatioBox box SHALL be present in the sample entry and set such that</assert>
-```
-hSpacing / vSpacing = MaxRenderWidth * (max_frame_height_minus_1 + 1) /
-                              ((max_frame_width_minus_1 + 1) * MaxRenderHeight)
-```
-
-The <dfn noexport>compressorname</dfn> field of the [=VisualSampleEntry=] is an informative name. It is formatted in a fixed 32-byte field, with the first byte set to the number of bytes to be displayed, followed by that number of bytes of displayable data, followed by padding to complete 32 bytes total (including the size byte). <assert>The value "\012AOM Coding" is RECOMMENDED</assert>; the first byte is a count of the remaining bytes, here represented by \012, which (being octal 12) is decimal 10, the number of bytes in the rest of the string.
-
-NOTE: Parsers may ignore the value of the compressorname field. It is specified in this document simply for legacy and backwards compatibility reasons.
-
-<assert>The <dfn noexport>config</dfn> field SHALL contain an [=AV1CodecConfigurationBox=] that applies to the samples associated with this sample entry.</assert>
-
-NOTE: <assert>Multiple instances of [=AV1SampleEntry=] may be required when the track contains samples requiring a [=AV1CodecConfigurationBox=] with different characteristics.</assert>
-
-<assert>Optional boxes not specifically mentioned here can be present, in particular those indicated in the definition of the [=VisualSampleEntry=] in [[ISOBMFF]].</assert>
-
-AV1 Codec Configuration Box {#av1codecconfigurationbox-section}
---------------------------------------------------------
-
-### Definition ### {#av1codecconfigurationbox-definition}
-
-<pre class="def">
-	Box Type:  <dfn export>av1C</dfn>
-	Container: AV1 Sample Entry ('av01')
-	<assert>Mandatory: Yes <span hidden>for av1C</span></assert>
-	<assert>Quantity:  Exactly One <span hidden>for av1C</span></assert>
-</pre>
-
-
-### Description ### {#av1codecconfigurationbox-description}
-
-<assert>The <dfn>AV1CodecConfigurationBox</dfn> contains decoder configuration information that SHALL be valid for every sample that references the sample entry.</assert>
-
-
-### Syntax ### {#av1codecconfigurationbox-syntax}
-
-```
-class AV1CodecConfigurationBox extends Box('av1C'){
-  AV1CodecConfigurationRecord av1Config;
-}
-
-aligned (8) class AV1CodecConfigurationRecord {
-  unsigned int (1) marker = 1;
-  unsigned int (7) version = 1;
-  unsigned int (3) seq_profile;
-  unsigned int (5) seq_level_idx_0;
-  unsigned int (1) seq_tier_0;
-  unsigned int (1) high_bitdepth;
-  unsigned int (1) twelve_bit;
-  unsigned int (1) monochrome;
-  unsigned int (1) chroma_subsampling_x;
-  unsigned int (1) chroma_subsampling_y;
-  unsigned int (2) chroma_sample_position;
-  unsigned int (3) reserved = 0;
-
-  unsigned int (1) initial_presentation_delay_present;
-  if (initial_presentation_delay_present) {
-    unsigned int (4) initial_presentation_delay_minus_one;
-  } else {
-    unsigned int (4) reserved = 0;
-  }
-
-  unsigned int (8)[] configOBUs;
-}
-```
-
-### Semantics ### {#av1codecconfigurationbox-semantics}
-
-<assert>The <dfn export>marker</dfn> field SHALL be set to 1.</assert>
-
-NOTE: The marker bit ensures that the bit pattern of the first byte of the AV1CodecConfigurationRecord cannot be mistaken for an [=OBU Header=] byte.
-
-The <dfn noexport>version</dfn> field indicates the version of the AV1CodecConfigurationRecord. <assert>The value SHALL be set to 1 for AV1CodecConfigurationRecord</assert>.
-
-<assert>The <dfn export>seq_profile</dfn> field indicates the AV1 profile and SHALL be equal to the seq_profile value from the [=Sequence Header OBU=].</assert>
-
-<assert>The <dfn export>seq_level_idx_0</dfn> field indicates the value of seq_level_idx[0] found in the [=Sequence Header OBU=] and SHALL be equal to the value of seq_level_idx[0] in the [=Sequence Header OBU=]</assert>.
-
-<assert>The <dfn export>seq_tier_0</dfn> field indicates the value of seq_tier[0] found in the [=Sequence Header OBU=] and SHALL be equal to the value of seq_tier[0] in the [=Sequence Header OBU=]</assert>.
-
-The <dfn export>high_bitdepth</dfn> field indicates the value of the [=high_bitdepth=] flag from the [=Sequence Header OBU=].
-
-The <dfn export>twelve_bit</dfn> field indicates the value of the [=twelve_bit=] flag from the [=Sequence Header OBU=]. <assert>When twelve_bit is not present in the [=Sequence Header OBU=] the AV1CodecConfigurationRecord twelve_bit value SHALL be 0.</assert>
-
-The <dfn export>monochrome</dfn> field indicates the value of the [=mono_chrome=] flag from the [=Sequence Header OBU=].
-
-The <dfn export>chroma_subsampling_x</dfn> field indicates the [=subsampling_x=] value from the [=Sequence Header OBU=].
-
-The <dfn export>chroma_subsampling_y</dfn> field indicates the [=subsampling_y=] value from the [=Sequence Header OBU=].
-
-The <dfn export>chroma_sample_position</dfn> field indicates the [=chroma_sample_position=] value from the [=Sequence Header OBU=].
-
-<assert>When not specified in the [=Sequence Header OBU=], and not defined by the conditions specified in the [[!AV1]] [=color_config=], the values of [=chroma_subsampling_x=], [=chroma_subsampling_y=], and [=chroma_sample_position=] SHALL be 0.</assert>
-
-The <dfn export>initial_presentation_delay_present</dfn> field indicates the presence of the initial_presentation_delay_minus_one field.
-
-The <dfn>initial_presentation_delay_minus_one</dfn> field indicates the number of samples (minus one) that need to be decoded prior to starting the presentation of the first sample associated with this sample entry in order to guarantee that each sample will be decoded prior to its presentation time under the constraints of the first level value indicated by [=seq_level_idx=] in the [=Sequence Header OBU=] (in the configOBUs field or in the associated samples). More precisely, <assert>the following procedure SHALL not return any error</assert>:
-- construct a hypothetical bitstream consisting of the OBUs carried in the sample entry followed by the OBUs carried in all the samples referring to that sample entry,
-- set the first [=initial_display_delay_minus_1=] field of each [=Sequence Header OBU=] to the number of frames minus one contained in the first [=initial_presentation_delay_minus_one=] + 1 samples,
-- set the [=frame_presentation_time=] field of the frame header of each presentable frame such that it matches the presentation time difference between the sample carrying this frame and the previous sample (if it exists, 0 otherwise),
-- apply the decoder model specified in [[!AV1]] to this hypothetical bitstream using the first operating point. If <code>buffer_removal_time</code> information is present in bitstream for this operating point, the decoding schedule mode SHALL be applied, otherwise the resource availability mode SHALL be applied.
-
-NOTE: With the above procedure, when smooth presentation can be guaranteed after decoding the first sample, initial_presentation_delay_minus_one is 0.
-
-NOTE: Because the above procedure considers all OBUs in all samples associated with a sample entry, if these OBUS form multiple coded video sequences which would have different values of <code>initial_presentation_delay_minus_one</code> if considered separately, the sample entry would signal the larger value.
-
-<div class=example>
-The difference between [=initial_presentation_delay_minus_one=] and [=initial_display_delay_minus_1=] can be illustrated by considering the following example:
-```
-a b c d e f g h
-```
-where letters correspond to frames. Assume that <code>[=initial_display_delay_minus_1=]</code> is 2, i.e. that once frame <code>c</code> has been decoded, all other frames in the bitstream can be presented on time. If those frames were grouped into temporal units and samples as follows:
-```
-[a] [b c d] [e] [f] [g] [h]
-```
-<code>[=initial_presentation_delay_minus_one=]</code> would be 1 because it takes presentation of 2 samples to ensure that <code>c</code> is decoded.
-But if the frames were grouped as follows:
-```
-[a] [b] [c] [d e f] [g] [h]
-```
-<code>[=initial_presentation_delay_minus_one=]</code> would be 2 because it takes presentation of 3 samples to ensure that <code>c</code> is decoded.
-</div>
-
-<assert>The <dfn export>configOBUs</dfn> field contains zero or more OBUs</assert>. Any OBU may be present provided that the following procedures produce compliant AV1 bitstreams:
-- <assert>From any sync sample, an AV1 bitstream is formed by first outputting the OBUs contained in the [=AV1CodecConfigurationBox=] and then by outputing all OBUs in the samples themselves, in order, starting from the sync sample.</assert>
-- <assert>From any sample marked with the [=AV1ForwardKeyFrameSampleGroupEntry=], an AV1 bitstream is formed by first outputting the OBUs contained in the [=AV1CodecConfigurationBox=] and then by outputing all OBUs in the sample itself, then by outputting all OBUs in the samples, in order, starting from the sample at the distance indicated by the sample group.</assert>
-
-Additionally, <assert>the configOBUs field SHALL contain at most one [=Sequence Header OBU=]</assert> and if present, <assert>it SHALL be the first OBU</assert>.
-
-NOTE: The configOBUs field is expected to contain only one [=Sequence Header OBU=] and zero or more [=Metadata OBUs=] when applicable to all the associated samples.
-
-OBUs stored in the configOBUs field follow the [=open_bitstream_unit=] [=Low Overhead Bitstream Format=] syntax as specified in [[!AV1]]. <assert>The flag [=obu_has_size_field=] SHALL be set to 1, indicating that the size of the OBU payload follows the header, and that it is coded using LEB128</assert>.
-
-<assert>When a [=Sequence Header OBU=] is contained within the configOBUs of the AV1CodecConfigurationRecord, the values present in the [=Sequence Header OBU=] contained within configOBUs SHALL match the values of the AV1CodecConfigurationRecord.</assert>
-
-The presentation times of AV1 samples are given by the ISOBMFF structures. <assert>The [=timing_info_present_flag=] in the [=Sequence Header OBU=] (in the configOBUs field or in the associated samples) SHOULD be set to 0</assert>. <assert>If set to 1, the [=timing_info=] structure of the [=Sequence Header OBU=], the [=frame_presentation_time=] and [=buffer_removal_time=] fields of the [=Frame Header OBUs=], if present, SHALL be ignored for the purpose of timed processing of the ISOBMFF file.</assert>
-
-<assert>The sample entry SHOULD contain a 'colr' box with a colour_type set to 'nclx'</assert>. <assert>If present, the values of colour_primaries, transfer_characteristics, and matrix_coefficients SHALL match the values given in the [=Sequence Header OBU=] (in the configOBUs field or in the associated samples) if the color_description_present_flag is set to 1</assert>. Similarly, <assert>the full_range_flag in the 'colr' box shall match the color_range flag in the [=Sequence Header OBU=]. When configOBUs does not contain a [=Sequence Header OBU=], this box with colour_type set to 'nclx' SHALL be present.</assert>
-
-<assert>The CleanApertureBox 'clap' SHOULD not be present.</assert>
-
-For sample entries corresponding to HDR content, <assert>the MasteringDisplayColourVolumeBox 'mdcv' and ContentLightLevelBox 'clli' SHOULD be present</assert>, and <assert>their values SHALL match the values of contained in the [=Metadata OBUs=] of type METADATA_TYPE_HDR_CLL and METADATA_TYPE_HDR_MDCV, if present (in the configOBUs or in the samples).</assert>
-
-NOTE: The MasteringDisplayColourVolumeBox 'mdcv' and ContentLightLevelBox 'clli' have identical syntax to the SMPTE2086MasteringDisplayMetadataBox 'SmDm' and ContentLightLevelBox 'CoLL', except that they are of type <code>Box</code> and not <code>FullBox</code>. However, the semantics of the MasteringDisplayColourVolumeBox and SMPTE2086MasteringDisplayMetadataBox have important differences and should not be confused.
-
-<assert>Additional boxes may be provided at the end of the [=VisualSampleEntry=] as permitted by ISOBMFF, that may represent redundant or similar information to the one provided in some OBUs contained in the [=AV1CodecConfigurationBox=]</assert>. If the box definition does not indicate that its information overrides the OBU information, in case of conflict, the OBU information should be considered authoritative.
-
-AV1 Sample Format {#sampleformat}
----------------------------------
-
-For tracks using the [=AV1SampleEntry=], an <dfn>AV1 Sample</dfn> has the following constraints:
-- <assert>the sample data SHALL be a sequence of [=OBUs=] forming a [=Temporal Unit=]</assert>,
-- <assert>each OBU SHALL follow the [=open_bitstream_unit=] [=Low Overhead Bitstream Format=] syntax as specified in [[!AV1]]</assert>. <assert>Each OBU SHALL have the [=obu_has_size_field=] set to 1 except for the last OBU in the sample</assert>, for which <assert>[=obu_has_size_field=] MAY be set to 0, in which case it is assumed to fill the remainder of the sample</assert>,
-
-NOTE: <assert>When extracting OBUs from an ISOBMFF file, and depending on the capabilities of the decoder processing these OBUs, ISOBMFF parsers MAY need to either: set the [=obu_has_size_field=] to 1 for some OBUs if not already set, add the size field in this case, and add [=Temporal Delimiter OBU=]; or use the length-delimited bitstream format as defined in Annex B of [=AV1=].</assert> <assert>If encryption is used, similar operations MAY have to be done before or after decryption depending on the demuxer/decryptor/decoder architecture.</assert>
-
-- <assert>OBU trailing bits SHOULD be limited to byte alignment and SHOULD not be used for padding</assert>,
-- <assert>OBUs of type OBU_TEMPORAL_DELIMITER, OBU_PADDING, or OBU_REDUNDANT_FRAME_HEADER SHOULD NOT be used</assert>.
-- <assert>OBUs of type OBU_TILE_LIST SHALL NOT be used</assert>.
-
-<assert>If an AV1 Sample is signaled as a sync sample (in the SyncSampleBox or by setting sample_is_non_sync_sample to 0), it SHALL be a Random Access Point as defined in [[!AV1]]</assert>, i.e. satisfy the following constraints:
-- Its first frame is a [=Key Frame=] that has [=show_frame=] flag set to 1,
-- It contains a [=Sequence Header OBU=] before the first [=Frame Header OBU=].
-
-NOTE: Within this definition, a sync sample may contain additional frames that are not Key Frames. The fact that none of them is the first frame in the temporal unit ensures that they are decodable.
-
-NOTE: Other types of OBUs such as [=metadata OBUs=] could be present before the [=Sequence Header OBU=].
-
-<assert>[=Intra-only frames=] SHOULD be signaled using the sample_depends_on flag set to 2</assert>.
-
-<assert>[=Delayed Random Access Points=] SHOULD be signaled using sample groups and the [=AV1ForwardKeyFrameSampleGroupEntry=]</assert>.
-
-<assert>[=Switch Frames=] SHOULD be signaled using sample groups and the [=AV1SwitchFrameSampleGroupEntry=]</assert>.
-
-Additionally, <assert>if a file contains multiple tracks that are alternative representations of the same content, in particular using [=Switch Frames=], those tracks SHOULD be marked as belonging to the same alternate group</assert> and <assert>should use a track selection box with an appropriate attribute (e.g. 'bitr')</assert>.
-
-<assert>In tracks using the [=AV1SampleEntry=], the 'ctts' box and composition offsets in movie fragments SHALL NOT be used</assert>. Similarly, <assert>the is_leading flag, if used, SHALL be set to 0 or 2</assert>.
-
-<assert>When a temporal unit contains more than one frame, the sample corresponding to that temporal unit MAY be marked using the [=AV1MultiFrameSampleGroupEntry=]</assert>.
-
-<assert>[=Metadata OBUs=] may be carried in sample data</assert>. In this case, <assert>the [=AV1MetadataSampleGroupEntry=] SHOULD be used</assert>. <assert>If the [=metadata OBUs=] are static for the entire set of samples associated with a given sample description entry, they SHOULD also be in the OBU array in the sample description entry</assert>.
-
-Unless explicitely stated, the grouping_type_parameter is not defined for the SampleToGroupBox with grouping types defined in this specification.
-
-AV1 Forward Key Frame sample group entry {#forwardkeyframesamplegroupentry}
-----------------------------------------------------------------
-
-### Definition ### {#forwardkeyframesamplegroupentry-definition}
-
-<pre class="def">
-	Group Type: <dfn export>av1f</dfn>
-	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <span hidden>for av1f</span></assert>
-	<assert>Quantity:   Zero or more <span hidden>for av1f</span></assert>.
-</pre>
-
-### Description ### {#forwardkeyframesamplegroupentry-description}
-
-The <dfn>AV1ForwardKeyFrameSampleGroupEntry</dfn> documents samples that contain a [=Delayed Random Access Point=] that are followed at a given distance in the bitstream by a [=Key Frame Dependent Recovery Point=].
-
-
-### Syntax ### {#forwardkeyframesamplegroupentry-syntax}
-
-```
-class AV1ForwardKeyFrameSampleGroupEntry extends VisualSampleGroupEntry('av1f') {
-  unsigned int(8) fwd_distance;
-}
-```
-
-### Semantics ### {#forwardkeyframesamplegroupentry-semantics}
-
-The <dfn export>fwd_distance</dfn> field indicates the number of samples between this sample and the next sample containing the associated [=Key Frame Dependent Recovery Point=]. 0 means the next sample.
-
-AV1 Multi-Frame sample group entry {#multiframesamplegroupentry}
-----------------------------------------------------------------
-
-### Definition ### {#multiframesamplegroupentry-definition}
-
-<pre class="def">
-	Group Type: <dfn value export for="AV1MultiFrameSampleGroupEntry">av1m</dfn>
-	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <span hidden>for av1m</span></assert>
-	<assert>Quantity:   Zero or more <span hidden>for av1m</span></assert>.
-</pre>
-
-
-### Description ### {#multiframesamplegroupentry-description}
-
-The <dfn>AV1MultiFrameSampleGroupEntry</dfn> documents samples that contain multiple frames.
-
-
-### Syntax ### {#multiframesamplegroupentry-syntax}
-
-```
-class AV1MultiFrameSampleGroupEntry extends VisualSampleGroupEntry('av1m') {
-}
-```
-
-AV1 Switch Frame sample group entry {#switchframesamplegroupentry}
--------------------------------------------------------
-
-### Definition ### {#switchframesamplegroupentry-definition}
-
-<pre class="def">
-	Group Type: <dfn export>av1s</dfn>
-	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <span hidden>for av1s</span></assert>
-	<assert>Quantity:   Zero or more <span hidden>for av1s</span></assert>.
-</pre>
-
-
-### Description ### {#switchframesamplegroupentry-description}
-
-The <dfn>AV1SwitchFrameSampleGroupEntry</dfn> documents samples that start with a [=Switch Frame=].
-
-### Syntax ### {#switchframesamplegroupentry-syntax}
-
-```
-class AV1SwitchFrameSampleGroupEntry extends VisualSampleGroupEntry('av1s') {
-}
-```
-
-AV1 Metadata sample group entry {#metadatasamplegroupentry}
------------------------------------------------------------
-
-### Definition ### {#metadatasamplegroupentry-definition}
-
-<pre class="def">
-	Group Type: <dfn value noexport for="AV1MetadataSampleGroupEntry">av1M</dfn>
-	Container:  Sample Group Description Box ('sgpd')
-	<assert>Mandatory:  No <span hidden>for av1M</span></assert>
-	<assert>Quantity:   Zero or more <span hidden>for av1M</span></assert>.
-</pre>
-
-
-### Description ### {#metadatasamplegroupentry-description}
-
-The <dfn>AV1MetadataSampleGroupEntry</dfn> documents samples that contain [=metadata OBUs=]. The <code>grouping_type_parameter</code> can be used to identify samples containing [=metadata OBUs=] of a given type. If no <code>grouping_type_parameter</code> is provided, the sample group entry identifies samples containing [=metadata OBUs=] for which the <code>metadata_type</code> is unknown.
-
-### Syntax ### {#metadatasamplegroupentry-syntax}
-
-```
-class AV1MetadataSampleGroupEntry extends VisualSampleGroupEntry('av1M') {
-}
-```
-
-For this sample group entry, the <code>grouping_type_parameter</code> syntax is as follows:
-
-```
-{
-   unsigned int (8) metadata_type;
-   unsigned int (24) metadata_specific_parameters;
-}
-```
-
-### Semantics ### {#metadatasamplegroupentry-semantics}
-
-<dfn export>metadata_type</dfn> is a 8-bit field whose value is the value of the metadata_type field defined in [[!AV1]], when it is equal or lower than 255. metadata_type values above 255 are not supported by this sample group.
-
-<dfn export>metadata_specific_parameters</dfn> provides an additional part of the <code>grouping_type_parameter</code>, which MAY be used to distinguish different sample groups having the same <code>metadata_type</code> but different sub-parameters. <assert>In this version of the specification, <code>metadata_specific_parameters</code> is only defined when <code>metadata_type</code> is set to <code>METADATA_TYPE_ITUT_T35</code> in which case its value SHALL be set to the first 24 bits of the <code>metadata_itut_t35</code> structure.</assert> <assert>For other types of metadata, its value SHOULD be set to 0. In all cases, when the <code>grouping_type_parameter</code> is used, readers processing sample groups SHALL use the entire value of <code>grouping_type_parameter</code></assert>.
-
-CMAF AV1 track format {#cmaf}
-=====================================================
-
-[[CMAF]] defines structural constraints on ISOBMFF files additional to [[ISOBMFF]] for the purpose of, for example, adaptive streaming or for protected files. Conformance to these structural constraints is signaled by the presence of the brand <code>[=cmfc=]</code> in the <code>FileTypeBox</code>.
-
-If a [=CMAF Video Track=] uses the brand <code>av01</code>, it is called a <dfn>CMAF AV1 Track</dfn> and the following constraints, defining the CMAF Media Profile for AV1, apply:
-- <assert>it SHALL use an [=AV1SampleEntry=]</assert>
-- <assert>it MAY use multiple sample entries, and in that case the following values SHALL not change in the track</assert>:
-    - <code>seq_profile</code>
-    - <code>still_picture</code>
-    - the first value of <code>seq_level_idx</code>
-    - the first value of <code>seq_tier</code>
-    - <code>color_config</code>
-    - <code>initial_presentation_delay_minus_one</code>
-
-<assert>When protected, [=CMAF AV1 Tracks=] SHALL use the signaling defined in [[!CMAF]], which in turn relies on [[!CENC]], with the provisions specified in [[#CommonEncryption]]</assert>.
-
-Common Encryption {#CommonEncryption}
-=========================
-
-<assert>[=CMAF AV1 Tracks=] and non-segmented AV1 files MAY be protected</assert>. <assert>If protected, they SHALL conform to [[!CENC]]</assert>. <assert>Files SHOULD be protected using the <code>[=cbcs=]</code> protection scheme</assert> and <assert>MAY be protected using the <code>[=cenc=]</code> protection scheme</assert>.
-
-<assert>When the protected scheme <code>[=cenc=]</code> is used, samples SHALL be protected using subsample encryption</assert> and <assert>SHALL NOT use pattern encryption</assert>.
-
-<assert>When the protected scheme <code>[=cbcs=]</code> is used, samples SHALL be protected using subsample encryption</assert> and <assert>SHALL use pattern encryption</assert>. [[!CENC]] recommends that the Block Pattern length be 10, i.e. <code>crypt_byte_block + skip_byte_block = 10</code>, where a Block is of size 16-bytes. In this specification, the combination of <code>crypt_byte_block</code> and <code>skip_byte_block</code> SHALL be one of the following, with the first one being recommended:
-- <assert><code>crypt_byte_block = 1</code> and <code>skip_byte_block = 9</code></assert>,
-- <assert><code>crypt_byte_block = 5</code> and <code>skip_byte_block = 5</code></assert>,
-- <assert><code>crypt_byte_block = 10</code> and <code>skip_byte_block = 0</code></assert>.
-
-
-General Subsample Encryption constraints {#subsample-encryption}
---------------------------------------
-
-Within protected samples, the following constraints apply:
-- <assert>Protected samples SHALL be exactly spanned by one or more contiguous subsamples</assert>.
-	- <assert>An OBU MAY be spanned by one or more subsamples</assert>, especially when it has multiple ranges of protected data. However, as recommended in [[!CENC]], writers SHOULD reduce the number of subsamples as possible. This can be achieved by using a subsample that spans multiple consecutive unprotected OBUs as well as the first unprotected and protected parts of the following protected OBU, if such protected OBU exists.
-	- <assert>A large unprotected OBU whose data size is larger than the maximum size of a single [=BytesOfClearData=] field MAY be spanned by multiple subsamples with zero size [=BytesOfProtectedData=]</assert>.
-
-- <assert>All [=OBU Headers=] and associated [=obu_size=] fields SHALL be unprotected</assert>.
-- <assert>[=Temporal Delimiter OBUs=], [=Sequence Header OBUs=], and [=Frame Header OBUs=] (including within a [=Frame OBU=]), [=Redundant Frame Header OBUs=] and [=Padding OBUs=] SHALL be unprotected</assert>.
-- <assert>[=Metadata OBUs=] MAY be protected</assert>.
-- <assert>[=Tile Group OBUs=] and [=Frame OBUs=] SHALL be protected</assert>. Within [=Tile Group OBUs=] or [=Frame OBUs=], the following applies:
-	- for the protected scheme <code>[=cbcs=]</code>:
-		- <assert>[=BytesOfProtectedData=] SHALL start on the first byte and end on the last byte of the <code>decode_tile</code> structure (including any trailing bits)</assert>.
-
-	    NOTE: As a result of the above, [=BytesOfProtectedData=] is not necessarily a multiple of 16 bytes and partial blocks are included in the [=BytesOfProtectedData=] range, but per [[!CENC]] the data is not be encrypted.
-
-	    - <assert>A subsample SHALL be created for each tile, even if its size is less than 16 bytes</assert>.
-		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <span hidden>for cbcs</span></assert>.
-
-	- for the protected scheme <code>[=cenc=]</code>:
-	    - <assert>[=BytesOfProtectedData=] SHALL be a multiple of 16 bytes</assert>.
-	    - <assert>[=BytesOfProtectedData=] SHALL end on the last byte of the <code>decode_tile</code> structure (including any trailing bits)</assert>.
-	    - <assert>[=BytesOfProtectedData=] SHALL span all complete 16-byte blocks of the <code>decode_tile</code> structure (including any trailing bits)</assert>.
-
-	    NOTE: As a result of the above, partial blocks are not used and it is possible that [=BytesOfProtectedData=] does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.
-	    - <assert>A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes</assert>. <assert>If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the [=BytesOfClearData=] field of a surrounding subsample, if any</assert>.
-		- <assert>All other parts of [=Tile Group OBUs=] and [=Frame OBUs=] SHALL be unprotected <span hidden>for cenc</span></assert>.
-
-Subsample Encryption Illustration {#subsample-encryption-illustration}
-------------------
-Figure #1 illustrates Subsample based encryption of AV1.
-
-<figure>
-<img alt="Subsample-based AV1 encryption" src="images/subsample_encryption.svg">
-<figcaption>Subsample-based AV1 encryption.</figcaption>
-</figure>
-
-Codecs Parameter String {#codecsparam}
-======================================
-
-DASH and other applications require defined values for the 'Codecs' parameter specified in [[!RFC6381]] for ISO Media tracks. The codecs parameter string for the AOM AV1 codec is as follows:
-```
-<sample entry 4CC>.<profile>.<level><tier>.<bitDepth>.<monochrome>.<chromaSubsampling>.
-<colorPrimaries>.<transferCharacteristics>.<matrixCoefficients>.<videoFullRangeFlag>
-```
-
-All fields following the sample entry 4CC are expressed as double digit decimals, unless indicated otherwise. Leading or trailing zeros cannot be omitted.
-
-<assert>The profile parameter value, represented by a single digit decimal, SHALL equal the value of seq_profile in the [=Sequence Header OBU=]</assert>.
-
-<assert>The level parameter value SHALL equal the first level value indicated by [=seq_level_idx=] in the [=Sequence Header OBU=]</assert>.
-
-<assert>The tier parameter value SHALL be equal to <code>M</code> when the first [=seq_tier=] value in the [=Sequence Header OBU=] is equal to 0, and <code>H</code> when it is equal to 1</assert>.
-
-<assert>The bitDepth parameter value SHALL equal the value of BitDepth variable as defined in [[AV1]] derived from the [=Sequence Header OBU=]</assert>.
-
-<assert>The monochrome parameter value, represented by a single digit decimal, SHALL equal the value of mono_chrome in the [=Sequence Header OBU=]</assert>.
-
-<assert>The chromaSubsampling parameter value, represented by a three-digit decimal, SHALL have its first digit equal to subsampling_x and its second digit equal to subsampling_y</assert>. <assert>If both subsampling_x and subsampling_y are set to 1, then the third digit SHALL be equal to chroma_sample_position, otherwise it SHALL be set to 0</assert>.
-
-<assert>The colorPrimaries, transferCharacteristics, matrixCoefficients, and videoFullRangeFlag parameter values SHALL equal the value of matching fields in the [=Sequence Header OBU=], if color_description_present_flag is set to 1</assert>, <assert>otherwise they SHOULD not be set, defaulting to the values below</assert>. The videoFullRangeFlag is represented by a single digit.
-
-For example, codecs="av01.0.04M.10.0.112.09.16.09.0" represents AV1 Main Profile, level 3.0, Main tier, 10-bit content, non-monochrome, with 4:2:0 chroma subsampling co-located with (0, 0) luma sample, ITU-R BT.2100 color primaries, ITU-R BT.2100 PQ transfer characteristics, ITU-R BT.2100 YCbCr color matrix, and studio swing representation.
-
-<assert>The parameters sample entry 4CC, profile, level, tier, and bitDepth are all mandatory fields</assert>. If any of these fields are empty, or not within their allowed range, the processing device SHOULD treat it as an error.
-
-<assert>All the other fields (including their leading '.') are optional, mutually inclusive (all or none) fields</assert>. If not specified then the values listed in the table below are assumed.
-
-<table class="def">
-<tr>
-<td>mono_chrome</td><td>0</td>
-</tr>
-<tr>
-<td>chromaSubsampling</td><td>110 (4:2:0)</td>
-</tr>
-<tr>
-<td>colorPrimaries</td><td>1 (ITU-R BT.709)</td>
-</tr>
-<tr>
-<td>transferCharacteristics</td><td>1 (ITU-R BT.709)</td>
-</tr>
-<tr>
-<td>matrixCoefficients</td><td>1 (ITU-R BT.709)</td>
-</tr>
-<tr>
-<td>videoFullRangeFlag</td><td>0 (studio swing representation)</td>
-</tr>
-</table>
-
-The string codecs="av01.0.01M.08" in this case would represent AV1 Main Profile, level 2.1, Main tier, 8-bit content with 4:2:0 chroma subsampling, ITU-R BT.709 color primaries, transfer characteristics, matrix coefficients, and studio swing representation.
-
-If any character that is not '.', digits, part of the AV1 4CC, or a tier value is encountered, the string SHALL be interpreted ignoring all the characters starting from that character.
-
-Changes since v1.1.0 release {#changelist}
-==========================================
-- <a href="https://github.com/AOMediaCodec/av1-isobmff/pull/116"> Change tile/subsample alignement for the <code>cbcs</code> protection scheme.</a>
-
-
diff --git a/v120_init.html b/v120_init.html
deleted file mode 100644
index 87e6bd8..0000000
--- a/v120_init.html
+++ /dev/null
@@ -1,3430 +0,0 @@
-<!doctype html><html lang="en">
- <head>
-  <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
-  <title>AV1 Codec ISO Media File Format Binding</title>
-  <meta content="width=device-width, initial-scale=1, shrink-to-fit=no" name="viewport">
-<style data-fill-with="stylesheet">/******************************************************************************
- *                   Style sheet for the W3C specifications                   *
- *
- * Special classes handled by this style sheet include:
- *
- * Indices
- *   - .toc for the Table of Contents (<ol class="toc">)
- *     + <span class="secno"> for the section numbers
- *   - #toc for the Table of Contents (<nav id="toc">)
- *   - ul.index for Indices (<a href="#ref">term</a><span>, in § N.M</span>)
- *   - table.index for Index Tables (e.g. for properties or elements)
- *
- * Structural Markup
- *   - table.data for general data tables
- *     -> use 'scope' attribute, <colgroup>, <thead>, and <tbody> for best results !
- *     -> use <table class='complex data'> for extra-complex tables
- *     -> use <td class='long'> for paragraph-length cell content
- *     -> use <td class='pre'> when manual line breaks/indentation would help readability
- *   - dl.switch for switch statements
- *   - ol.algorithm for algorithms (helps to visualize nesting)
- *   - .figure and .caption (HTML4) and figure and figcaption (HTML5)
- *     -> .sidefigure for right-floated figures
- *   - ins/del
- *     -> ins/del.c### for candidate and proposed changes (amendments)
- *
- * Code
- *   - pre and code
- *
- * Special Sections
- *   - .note       for informative notes             (div, p, span, aside, details)
- *   - .example    for informative examples          (div, p, pre, span)
- *   - .issue      for issues                        (div, p, span)
- *   - .advisement for loud normative statements     (div, p, strong)
- *   - .annoying-warning for spec obsoletion notices (div, aside, details)
- *   - .correction for "candidate corrections"       (div, aside, details, section)
- *   - .addition   for "candidate additions"         (div, aside, details, section)
- *   - .correction.proposed for "proposed corrections" (div, aside, details, section)
- *   - .addition.proposed   for "proposed additions"   (div, aside, details, section)
- *
- * Definition Boxes
- *   - pre.def   for WebIDL definitions
- *   - table.def for tables that define other entities (e.g. CSS properties)
- *   - dl.def    for definition lists that define other entitles (e.g. HTML elements)
- *
- * Numbering
- *   - .secno for section numbers in .toc and headings (<span class='secno'>3.2</span>)
- *   - .marker for source-inserted example/figure/issue numbers (<span class='marker'>Issue 4</span>)
- *   - ::before styled for CSS-generated issue/example/figure numbers:
- *     -> Documents wishing to use this only need to add
- *        figcaption::before,
- *        .caption::before { content: "Figure "  counter(figure) " ";  }
- *        .example::before { content: "Example " counter(example) " "; }
- *        .issue::before   { content: "Issue "   counter(issue) " ";   }
- *
- * Header Stuff (ignore, just don't conflict with these classes)
- *   - .head for the header
- *   - .copyright for the copyright
- *
- * Outdated warning for old specs
- *
- * Miscellaneous
- *   - .overlarge for things that should be as wide as possible, even if
- *     that overflows the body text area. This can be used on an item or
- *     on its container, depending on the effect desired.
- *     Note that this styling basically doesn't help at all when printing,
- *     since A4 paper isn't much wider than the max-width here.
- *     It's better to design things to fit into a narrower measure if possible.
- *
- *   - js-added ToC jump links (see fixup.js)
- *
- ******************************************************************************/
-
-/* color variables included separately for reliability */
-
-/******************************************************************************/
-/*                                    Body                                    */
-/******************************************************************************/
-
-	html {
-	}
-
-	body {
-		counter-reset: example figure issue;
-
-		/* Layout */
-		max-width: 50em;			  /* limit line length to 50em for readability   */
-		margin: 0 auto;				/* center text within page                    */
-		padding: 1.6em 1.5em 2em 50px; /* assume 16px font size for downlevel clients */
-		padding: 1.6em 1.5em 2em calc(26px + 1.5em); /* leave space for status flag    */
-
-		/* Typography */
-		line-height: 1.5;
-		font-family: sans-serif;
-		widows: 2;
-		orphans: 2;
-		word-wrap: break-word;
-		overflow-wrap: break-word;
-		hyphens: auto;
-
-		color: black;
-		color: var(--text);
-		background: white top left fixed no-repeat;
-		background: var(--bg) top left fixed no-repeat;
-		background-size: 25px auto;
-	}
-
-
-/******************************************************************************/
-/*                         Front Matter & Navigation                          */
-/******************************************************************************/
-
-/** Header ********************************************************************/
-
-	div.head { margin-bottom: 1em; }
-	div.head hr { border-style: solid; }
-
-	div.head h1 {
-		font-weight: bold;
-		margin: 0 0 .1em;
-		font-size: 220%;
-	}
-
-	div.head h2 { margin-bottom: 1.5em;}
-
-/** W3C Logo ******************************************************************/
-
-	.head .logo {
-		float: right;
-		margin: 0.4rem 0 0.2rem .4rem;
-	}
-
-	.head img[src*="logos/W3C"] {
-		display: block;
-		border: solid #1a5e9a;
-		border: solid var(--logo-bg);
-		border-width: .65rem .7rem .6rem;
-		border-radius: .4rem;
-		background: #1a5e9a;
-		background: var(--logo-bg);
-		color: white;
-		color: var(--logo-text);
-		font-weight: bold;
-	}
-
-	.head a:hover > img[src*="logos/W3C"],
-	.head a:focus > img[src*="logos/W3C"] {
-		opacity: .8;
-	}
-
-	.head a:active > img[src*="logos/W3C"] {
-		background: #c00;
-		background: var(--logo-active-bg);
-		border-color: #c00;
-		border-color: var(--logo-active-bg);
-	}
-
-	/* see also additional rules in Link Styling section */
-
-/** Copyright *****************************************************************/
-
-	p.copyright,
-	p.copyright small { font-size: small; }
-
-/** Back to Top / ToC Toggle **************************************************/
-
-	@media print {
-		#toc-nav {
-			display: none;
-		}
-	}
-	@media not print {
-		#toc-nav {
-			position: fixed;
-			z-index: 3;
-			bottom: 0; left: 0;
-			margin: 0;
-			min-width: 1.33em;
-			border-top-right-radius: 2rem;
-			box-shadow: 0 0 2px;
-			font-size: 1.5em;
-		}
-		#toc-nav > a {
-			display: block;
-			white-space: nowrap;
-
-			height: 1.33em;
-			padding: .1em 0.3em;
-			margin: 0;
-
-			box-shadow: 0 0 2px;
-			border: none;
-			border-top-right-radius: 1.33em;
-
-			color: #707070;
-			color: var(--tocnav-normal-text);
-			background: white;
-			background: var(--tocnav-normal-bg);
-		}
-		#toc-nav > a:hover,
-		#toc-nav > a:focus {
-			color: black;
-			color: var(--tocnav-hover-text);
-			background: #f8f8f8;
-			background: var(--tocnav-hover-bg);
-		}
-		#toc-nav > a:active {
-			color: #c00;
-			color: var(--tocnav-active-text);
-			background: white;
-			background: var(--tocnav-active-bg);
-		}
-
-		#toc-nav > #toc-jump {
-			padding-bottom: 2em;
-			margin-bottom: -1.9em;
-		}
-
-		/* statusbar gets in the way on keyboard focus; remove once browsers fix */
-		#toc-nav > a[href="#toc"]:not(:hover):focus:last-child {
-			padding-bottom: 1.5rem;
-		}
-
-		#toc-nav:not(:hover) > a:not(:focus) > span + span {
-			/* Ideally this uses :focus-within on #toc-nav */
-			display: none;
-		}
-		#toc-nav > a > span + span {
-			padding-right: 0.2em;
-		}
-	}
-
-/** ToC Sidebar ***************************************************************/
-
-	/* Floating sidebar */
-	@media screen {
-		body.toc-sidebar #toc {
-			position: fixed;
-			top: 0; bottom: 0;
-			left: 0;
-			width: 23.5em;
-			max-width: 80%;
-			max-width: calc(100% - 2em - 26px);
-			overflow: auto;
-			padding: 0 1em;
-			padding-left: 42px;
-			padding-left: calc(1em + 26px);
-			color: black;
-			color: var(--tocsidebar-text);
-			background: inherit;
-			background-color: #f7f8f9;
-			background-color: var(--tocsidebar-bg);
-			z-index: 1;
-			box-shadow: -.1em 0 .25em rgba(0,0,0,.1) inset;
-			box-shadow: -.1em 0 .25em var(--tocsidebar-shadow) inset;
-		}
-		body.toc-sidebar #toc h2 {
-			margin-top: .8rem;
-			font-variant: small-caps;
-			font-variant: all-small-caps;
-			text-transform: lowercase;
-			font-weight: bold;
-			color: gray;
-			color: hsla(203,20%,40%,.7);
-			color: var(--tocsidebar-heading-text);
-		}
-		body.toc-sidebar #toc-jump:not(:focus) {
-			width: 0;
-			height: 0;
-			padding: 0;
-			position: absolute;
-			overflow: hidden;
-		}
-	}
-	/* Hide main scroller when only the ToC is visible anyway */
-	@media screen and (max-width: 28em) {
-		body.toc-sidebar {
-			overflow: hidden;
-		}
-	}
-
-	/* Sidebar with its own space */
-	@media screen and (min-width: 78em) {
-		body:not(.toc-inline) #toc {
-			position: fixed;
-			top: 0; bottom: 0;
-			left: 0;
-			width: 23.5em;
-			overflow: auto;
-			padding: 0 1em;
-			padding-left: 42px;
-			padding-left: calc(1em + 26px);
-			color: black;
-			color: var(--tocsidebar-text);
-			background: inherit;
-			background-color: #f7f8f9;
-			background-color: var(--tocsidebar-bg);
-			z-index: 1;
-			box-shadow: -.1em 0 .25em rgba(0,0,0,.1) inset;
-			box-shadow: -.1em 0 .25em var(--tocsidebar-shadow) inset;
-		}
-		body:not(.toc-inline) #toc h2 {
-			margin-top: .8rem;
-			font-variant: small-caps;
-			font-variant: all-small-caps;
-			text-transform: lowercase;
-			font-weight: bold;
-			color: gray;
-			color: hsla(203,20%,40%,.7);
-			color: var(--tocsidebar-heading-text);
-		}
-
-		body:not(.toc-inline) {
-			padding-left: 29em;
-		}
-		/* See also Overflow section at the bottom */
-
-		body:not(.toc-inline) #toc-jump:not(:focus) {
-			width: 0;
-			height: 0;
-			padding: 0;
-			position: absolute;
-			overflow: hidden;
-		}
-	}
-	@media screen and (min-width: 90em) {
-		body:not(.toc-inline) {
-			margin: 0 4em;
-		}
-	}
-
-/******************************************************************************/
-/*                                Sectioning                                  */
-/******************************************************************************/
-
-/** Headings ******************************************************************/
-
-	h1, h2, h3, h4, h5, h6, dt {
-		page-break-after: avoid;
-		page-break-inside: avoid;
-		font: 100% sans-serif;   /* Reset all font styling to clear out UA styles */
-		font-family: inherit;	/* Inherit the font family. */
-		line-height: 1.2;		/* Keep wrapped headings compact */
-		hyphens: manual;		/* Hyphenated headings look weird */
-	}
-
-	h2, h3, h4, h5, h6 {
-		margin-top: 3rem;
-	}
-
-	h1, h2, h3 {
-		color: #005A9C;
-		color: var(--heading-text);
-	}
-
-	h1 { font-size: 170%; }
-	h2 { font-size: 140%; }
-	h3 { font-size: 120%; }
-	h4 { font-weight: bold; }
-	h5 { font-style: italic; }
-	h6 { font-variant: small-caps; }
-	dt { font-weight: bold; }
-
-/** Subheadings ***************************************************************/
-
-	h1 + h2,
-	#profile-and-date {
-		/* #profile-and-date is a subtitle in an H2 under the H1 */
-		margin-top: 0;
-	}
-	h2 + h3,
-	h3 + h4,
-	h4 + h5,
-	h5 + h6 {
-		margin-top: 1.2em; /* = 1 x line-height */
-	}
-
-/** Section divider ***********************************************************/
-
-	:not(.head) > :not(.head) + hr {
-		font-size: 1.5em;
-		text-align: center;
-		margin: 1em auto;
-		height: auto;
-		color: black;
-		color: var(--hr-text);
-		border: transparent solid 0;
-		background: transparent;
-	}
-	:not(.head) > hr::before {
-		content: "\2727\2003\2003\2727\2003\2003\2727";
-	}
-
-/******************************************************************************/
-/*                            Paragraphs and Lists                            */
-/******************************************************************************/
-
-	p {
-		margin: 1em 0;
-	}
-
-	dd > p:first-child,
-	li > p:first-child {
-		margin-top: 0;
-	}
-
-	ul, ol {
-		margin-left: 0;
-		padding-left: 2em;
-	}
-
-	li {
-		margin: 0.25em 0 0.5em;
-		padding: 0;
-	}
-
-	dl dd {
-		margin: 0 0 .5em 2em;
-	}
-
-	.head dd + dd { /* compact for header */
-		margin-top: -.5em;
-	}
-
-	/* Style for algorithms */
-	ol.algorithm ol:not(.algorithm),
-	.algorithm > ol ol:not(.algorithm) {
-	border-left: 0.5em solid #DEF;
-	border-left: 0.5em solid var(--algo-border);
-	}
-
-	/* Put nice boxes around each algorithm. */
-	[data-algorithm]:not(.heading) {
-	 padding: .5em;
-	 border: thin solid #ddd;
-	 border: thin solid var(--algo-border);
-	 border-radius: .5em;
-	 margin: .5em calc(-0.5em - 1px);
-	}
-	[data-algorithm]:not(.heading) > :first-child {
-	 margin-top: 0;
-	}
-	[data-algorithm]:not(.heading) > :last-child {
-	 margin-bottom: 0;
-	}
-
-	/* Style for switch/case <dl>s */
-	dl.switch > dd > ol.only,
-	dl.switch > dd > .only > ol {
-	margin-left: 0;
-	}
-	dl.switch > dd > ol.algorithm,
-	dl.switch > dd > .algorithm > ol {
-	margin-left: -2em;
-	}
-	dl.switch {
-	padding-left: 2em;
-	}
-	dl.switch > dt {
-	text-indent: -1.5em;
-	margin-top: 1em;
-	}
-	dl.switch > dt + dt {
-	margin-top: 0;
-	}
-	dl.switch > dt::before {
-	content: '\21AA';
-	padding: 0 0.5em 0 0;
-	display: inline-block;
-	width: 1em;
-	text-align: right;
-	line-height: 0.5em;
-	}
-
-/** Terminology Markup ********************************************************/
-
-
-/******************************************************************************/
-/*                                 Inline Markup                              */
-/******************************************************************************/
-
-/** Terminology Markup ********************************************************/
-	dfn   { /* Defining instance */
-		font-weight: bolder;
-	}
-	a > i { /* Instance of term */
-		font-style: normal;
-	}
-	dt dfn code, code.idl {
-		font-size: inherit;
-	}
-	dfn var {
-		font-style: normal;
-	}
-
-/** Change Marking ************************************************************/
-
-	del {
-		color: #aa0000;
-		color: var(--del-text);
-		background: transparent;
-		background: var(--del-bg);
-		text-decoration: line-through;
-	}
-	ins {
-		color: #006100;
-		color: var(--ins-text);
-		background: transparent;
-		background: var(--ins-bg);
-		text-decoration: underline;
-	}
-
-	/* for amendments (candidate/proposed changes) */
-
-	.amendment ins, .correction ins, .addition ins,
-	ins[class^=c] {
-		text-decoration-style: dotted;
-	}
-	.amendment del, .correction del, .addition del,
-	del[class^=c] {
-		text-decoration-style: dotted;
-	}
-	.amendment.proposed ins, .correction.proposed ins, .addition.proposed ins,
-	ins[class^=c].proposed {
-		text-decoration-style: double;
-	}
-	.amendment.proposed del, .correction.proposed del, .addition.proposed del,
-	del[class^=c].proposed {
-		text-decoration-style: double;
-	}
-
-/** Miscellaneous improvements to inline formatting ***************************/
-
-	sup {
-		vertical-align: super;
-		font-size: 80%
-	}
-
-/******************************************************************************/
-/*                                    Code                                    */
-/******************************************************************************/
-
-/** General monospace/pre rules ***********************************************/
-
-	pre, code, samp {
-		font-family: Menlo, Consolas, "DejaVu Sans Mono", Monaco, monospace;
-		font-size: .9em;
-		hyphens: none;
-		text-transform: none;
-		text-align: left;
-		text-align: start;
-		font-variant: normal;
-		orphans: 3;
-		widows: 3;
-		page-break-before: avoid;
-	}
-	pre code,
-	code code {
-		font-size: 100%;
-	}
-
-	pre {
-		margin-top: 1em;
-		margin-bottom: 1em;
-		overflow: auto;
-	}
-
-/** Inline Code fragments *****************************************************/
-
-	/* Do something nice. */
-
-/******************************************************************************/
-/*                                    Links                                   */
-/******************************************************************************/
-
-/** General Hyperlinks ********************************************************/
-
-	/* We hyperlink a lot, so make it less intrusive */
-	a[href] {
-		color: #034575;
-		color: var(--a-normal-text);
-		text-decoration: underline #707070;
-		text-decoration: underline var(--a-normal-underline);
-		text-decoration-skip-ink: none;
-	}
-	a:visited {
-		color: #034575;
-		color: var(--a-visited-text);
-		text-decoration-color: #bbb;
-		text-decoration-color: var(--a-visited-underline);
-	}
-
-	/* Indicate interaction with the link */
-	a[href]:focus,
-	a[href]:hover {
-		text-decoration-thickness: 2px;
-	}
-	a[href]:active {
-		color: #c00;
-		color: var(--a-active-text);
-		text-decoration-color: #c00;
-		text-decoration-color: var(--a-active-underline);
-	}
-
-	/* Backout above styling for W3C logo */
-	.head .logo,
-	.head .logo a {
-		border: none;
-		text-decoration: none;
-		background: transparent;
-	}
-
-/******************************************************************************/
-/*                                    Images                                  */
-/******************************************************************************/
-
-	img {
-		border-style: none;
-	}
-
-	img, svg {
-		/* Intentionally not color-scheme aware. */
-		background: white;
-	}
-
-	/* For autogen numbers, add
-	  .caption::before, figcaption::before { content: "Figure " counter(figure) ". "; }
-	*/
-
-	figure, .figure, .sidefigure {
-		page-break-inside: avoid;
-		text-align: center;
-		margin: 2.5em 0;
-	}
-	.figure img,	.sidefigure img,	figure img,
-	.figure object, .sidefigure object, figure object {
-		max-width: 100%;
-		margin: auto;
-		height: auto;
-	}
-	.figure pre, .sidefigure pre, figure pre {
-		text-align: left;
-		display: table;
-		margin: 1em auto;
-	}
-	.figure table, figure table {
-		margin: auto;
-	}
-	@media screen and (min-width: 20em) {
-		.sidefigure {
-			float: right;
-			width: 50%;
-			margin: 0 0 0.5em 0.5em;
-		}
-	}
-	.caption, figcaption, caption {
-		font-style: italic;
-		font-size: 90%;
-	}
-	.caption::before, figcaption::before, figcaption > .marker {
-		font-weight: bold;
-	}
-	.caption, figcaption {
-		counter-increment: figure;
-	}
-
-	/* DL list is indented 2em, but figure inside it is not */
-	dd > .figure, dd > figure { margin-left: -2em; }
-
-/******************************************************************************/
-/*                             Colored Boxes                                  */
-/******************************************************************************/
-
-	.issue, .note, .example, .assertion, .advisement, blockquote,
-	.amendment, .correction, .addition {
-		margin: 1em auto;
-		padding: .5em;
-		border: .5em;
-		border-left-style: solid;
-		page-break-inside: avoid;
-	}
-	span.issue, span.note {
-		padding: .1em .5em .15em;
-		border-right-style: solid;
-	}
-
-	blockquote > :first-child,
-	.note  > p:first-child,
-	.issue > p:first-child,
-	.amendment > p:first-child,
-	.correction > p:first-child,
-	.addition > p:first-child {
-		margin-top: 0;
-	}
-	blockquote > :last-child,
-	.note  > p:last-child,
-	.issue > p:last-child,
-	.amendment > p:last-child,
-	.correction > p:last-child,
-	.addition > p:last-child {
-		margin-bottom: 0;
-	}
-
-
-	.issue::before, .issue > .marker,
-	.example::before, .example > .marker,
-	.note::before, .note > .marker,
-	details.note > summary > .marker,
-	.amendment::before, .amendment > .marker,
-	details.amendment > summary > .marker,
-	.addition::before, .addition > .marker,
-	addition.amendment > summary > .marker,
-	.correction::before, .correction > .marker,
-	correction.amendment > summary > .marker
-	{
-		text-transform: uppercase;
-		padding-right: 1em;
-	}
-
-	.example::before, .example > .marker {
-		display: block;
-		padding-right: 0em;
-	}
-
-/** Blockquotes ***************************************************************/
-
-	blockquote {
-		border-color: silver;
-		border-color: var(--blockquote-border);
-		background: transparent;
-		background: var(--blockquote-bg);
-		color: currentcolor;
-		color: var(--blockquote-text);
-	}
-
-/** Open issue ****************************************************************/
-
-	.issue {
-		border-color: #e05252;
-		border-color: var(--issue-border);
-		background: #fbe9e9;
-		background: var(--issue-bg);
-		color: black;
-		color: var(--issue-text);
-		counter-increment: issue;
-		overflow: auto;
-	}
-	.issue::before, .issue > .marker {
-		color: #831616;
-		color: var(--issueheading-text);
-	}
-	/* Add .issue::before { content: "Issue " counter(issue) " "; } for autogen numbers,
-	  or use class="marker" to mark up the issue number in source. */
-
-/** Example *******************************************************************/
-
-	.example {
-		border-color: #e0cb52;
-		border-color: var(--example-border);
-		background: #fcfaee;
-		background: var(--example-bg);
-		color: black;
-		color: var(--example-text);
-		counter-increment: example;
-		overflow: auto;
-		clear: both;
-	}
-	.example::before, .example > .marker {
-		color: #574b0f;
-		color: var(--exampleheading-text);
-	}
-	/* Add .example::before { content: "Example " counter(example) " "; } for autogen numbers,
-	  or use class="marker" to mark up the example number in source. */
-
-/** Non-normative Note ********************************************************/
-
-	.note {
-		border-color: #52e052;
-		border-color: var(--note-border);
-		background: #e9fbe9;
-		background: var(--note-bg);
-		color: black;
-		color: var(--note-text);
-		overflow: auto;
-	}
-
-	.note::before, .note > .marker,
-	details.note > summary {
-		color: hsl(120, 70%, 30%);
-		color: var(--noteheading-text);
-	}
-	/* Add .note::before { content: "Note "; } for autogen label,
-	  or use class="marker" to mark up the label in source. */
-
-	details.note[open] > summary {
-		border-bottom: 1px silver solid;
-		border-bottom: 1px var(--notesummary-underline) solid;
-	}
-
-/** Assertion Box *************************************************************/
-	/*  for assertions in algorithms */
-
-	.assertion {
-		border-color: #AAA;
-		border-color: var(--assertion-border);
-		background: #EEE;
-		background: var(--assertion-bg);
-		color: black;
-		color: var(--assertion-text);
-	}
-
-/** Advisement Box ************************************************************/
-	/*  for attention-grabbing normative statements */
-
-	.advisement {
-		border-color: orange;
-		border-color: var(--advisement-border);
-		border-style: none solid;
-		background: #fec;
-		background: var(--advisement-bg);
-		color: black;
-		color: var(--advisement-text);
-	}
-	strong.advisement {
-		display: block;
-		text-align: center;
-	}
-	.advisement::before, .advisement > .marker {
-		color: #b35f00;
-		color: var(--advisementheading-text);
-	}
-
-/** Amendment Box *************************************************************/
-
-	.amendment, .correction, .addition {
-		border-color: #330099;
-		border-color: var(--amendment-border);
-		background: #F5F0FF;
-		background: var(--amendment-bg);
-		color: black;
-		color: var(--amendment-text);
-	}
-	.amendment.proposed, .correction.proposed, .addition.proposed {
-		border-style: solid;
-		border-block-width: 0.25em;
-	}
-	.amendment::before, .amendment > .marker,
-	details.amendment > summary::before, details.amendment > summary > .marker,
-	.correction::before, .correction > .marker,
-	details.correction > summary::before, details.correction > summary > .marker,
-	.addition::before, .addition > .marker,
-	details.addition > summary::before, details.addition > summary > .marker {
-		color: #220066;
-		color: var(--amendmentheading-text);
-	}
-	.amendment.proposed::before, .amendment.proposed > .marker,
-	details.amendment.proposed > summary::before, details.amendment.proposed > summary > .marker,
-	.correction.proposed::before, .correction.proposed > .marker,
-	details.correction.proposed > summary::before, details.correction.proposed > summary > .marker,
-	.addition.proposed::before, .addition.proposed > .marker,
-	details.addition.proposed > summary::before, details.addition.proposed > summary > .marker {
-		font-weight: bold;
-	}
-
-/** Spec Obsoletion Notice ****************************************************/
-	/* obnoxious obsoletion notice for older/abandoned specs. */
-
-	details {
-		display: block;
-	}
-	summary {
-		font-weight: bolder;
-	}
-
-	.annoying-warning:not(details),
-	details.annoying-warning:not([open]) > summary,
-	details.annoying-warning[open] {
-		background: hsla(40,100%,50%,0.95);
-		background: var(--warning-bg);
-		color: black;
-		color: var(--warning-text);
-		padding: .75em 1em;
-		border: red;
-		border: var(--warning-border);
-		border-style: solid none;
-		box-shadow: 0 2px 8px black;
-		text-align: center;
-	}
-	.annoying-warning :last-child {
-		margin-bottom: 0;
-	}
-
-@media not print {
-	details.annoying-warning[open] {
-		position: fixed;
-		left: 0;
-		right: 0;
-		bottom: 2em;
-		z-index: 1000;
-	}
-}
-
-	details.annoying-warning:not([open]) > summary {
-		text-align: center;
-	}
-
-/** Entity Definition Boxes ***************************************************/
-
-	.def {
-		padding: .5em 1em;
-		background: #def;
-		background: var(--def-bg);
-		margin: 1.2em 0;
-		border-left: 0.5em solid #8ccbf2;
-		border-left: 0.5em solid var(--def-border);
-		color: black;
-		color: var(--def-text);
-	}
-
-/******************************************************************************/
-/*                                    Tables                                  */
-/******************************************************************************/
-
-	th, td {
-		text-align: left;
-		text-align: start;
-	}
-
-/** Property/Descriptor Definition Tables *************************************/
-
-	table.def {
-		/* inherits .def box styling, see above */
-		width: 100%;
-		border-spacing: 0;
-	}
-
-	table.def td,
-	table.def th {
-		padding: 0.5em;
-		vertical-align: baseline;
-		border-bottom: 1px solid #bbd7e9;
-		border-bottom: 1px solid var(--defrow-border);
-	}
-
-	table.def > tbody > tr:last-child th,
-	table.def > tbody > tr:last-child td {
-		border-bottom: 0;
-	}
-
-	table.def th {
-		font-style: italic;
-		font-weight: normal;
-		padding-left: 1em;
-		width: 3em;
-	}
-
-	/* For when values are extra-complex and need formatting for readability */
-	table td.pre {
-		white-space: pre-wrap;
-	}
-
-	/* A footnote at the bottom of a def table */
-	table.def td.footnote {
-		padding-top: 0.6em;
-	}
-	table.def td.footnote::before {
-		content: " ";
-		display: block;
-		height: 0.6em;
-		width: 4em;
-		border-top: thin solid;
-	}
-
-/** Data tables (and properly marked-up index tables) *************************/
-	/*
-		<table class="data"> highlights structural relationships in a table
-		when correct markup is used (e.g. thead/tbody, th vs. td, scope attribute)
-
-		Use class="complex data" for particularly complicated tables --
-		(This will draw more lines: busier, but clearer.)
-
-		Use class="long" on table cells with paragraph-like contents
-		(This will adjust text alignment accordingly.)
-		Alternately use class="longlastcol" on tables, to have the last column assume "long".
-	*/
-
-	table {
-		word-wrap: normal;
-		overflow-wrap: normal;
-		hyphens: manual;
-	}
-
-	table.data,
-	table.index {
-		margin: 1em auto;
-		border-collapse: collapse;
-		border: hidden;
-		width: 100%;
-	}
-	table.data caption,
-	table.index caption {
-		max-width: 50em;
-		margin: 0 auto 1em;
-	}
-
-	table.data td,  table.data th,
-	table.index td, table.index th {
-		padding: 0.5em 1em;
-		border-width: 1px;
-		border-color: silver;
-		border-color: var(--datacell-border);
-		border-top-style: solid;
-	}
-
-	table.data thead td:empty {
-		padding: 0;
-		border: 0;
-	}
-
-	table.data  thead,
-	table.index thead,
-	table.data  tbody,
-	table.index tbody {
-		border-bottom: 2px solid;
-	}
-
-	table.data colgroup,
-	table.index colgroup {
-		border-left: 2px solid;
-	}
-
-	table.data  tbody th:first-child,
-	table.index tbody th:first-child  {
-		border-right: 2px solid;
-		border-top: 1px solid silver;
-		border-top: 1px solid var(--datacell-border);
-		padding-right: 1em;
-	}
-
-	table.data th[colspan],
-	table.data td[colspan] {
-		text-align: center;
-	}
-
-	table.complex.data th,
-	table.complex.data td {
-		border: 1px solid silver;
-		border: 1px solid var(--datacell-border);
-		text-align: center;
-	}
-
-	table.data.longlastcol td:last-child,
-	table.data td.long {
-		vertical-align: baseline;
-		text-align: left;
-	}
-
-	table.data img {
-		vertical-align: middle;
-	}
-
-
-/*
-Alternate table alignment rules
-
-	table.data,
-	table.index {
-		text-align: center;
-	}
-
-	table.data  thead th[scope="row"],
-	table.index thead th[scope="row"] {
-		text-align: right;
-	}
-
-	table.data  tbody th:first-child,
-	table.index tbody th:first-child  {
-		text-align: right;
-	}
-
-Possible extra rowspan handling
-
-	table.data  tbody th[rowspan]:not([rowspan='1']),
-	table.index tbody th[rowspan]:not([rowspan='1']),
-	table.data  tbody td[rowspan]:not([rowspan='1']),
-	table.index tbody td[rowspan]:not([rowspan='1']) {
-		border-left: 1px solid silver;
-	}
-
-	table.data  tbody th[rowspan]:first-child,
-	table.index tbody th[rowspan]:first-child,
-	table.data  tbody td[rowspan]:first-child,
-	table.index tbody td[rowspan]:first-child{
-		border-left: 0;
-		border-right: 1px solid silver;
-	}
-*/
-
-/******************************************************************************/
-/*                                  Indices                                   */
-/******************************************************************************/
-
-
-/** Table of Contents *********************************************************/
-
-	.toc a {
-		/* More spacing; use padding to make it part of the click target. */
-		padding: 0.1rem 1px 0;
-		/* Larger, more consistently-sized click target */
-		display: block;
-		/* Switch to using border-bottom for underlines */
-		text-decoration: none;
-		border-bottom: 1px solid;
-		/* Reverse color scheme */
-		color: black;
-		color: var(--toclink-text);
-		border-color: #3980b5;
-		border-color: var(--toclink-underline);
-	}
-	.toc a:visited {
-		color: black;
-		color: var(--toclink-visited-text);
-		border-color: #054572;
-		border-color: var(--toclink-visited-underline);
-	}
-	.toc a:focus,
-	.toc a:hover {
-		background: rgba(75%, 75%, 75%, .25);
-		background: var(--a-hover-bg);
-		border-bottom-width: 3px;
-		margin-bottom: -2px;
-	}
-	.toc a:not(:focus):not(:hover) {
-		/* Allow colors to cascade through from link styling */
-		border-bottom-color: transparent;
-	}
-
-	.toc, .toc ol, .toc ul, .toc li {
-		list-style: none; /* Numbers must be inlined into source */
-		/* because generated content isn't search/selectable and markers can't do multilevel yet */
-		margin:  0;
-		padding: 0;
-	}
-	.toc {
-		line-height: 1.1em;
-	}
-
-	/* ToC not indented until third level, but font style & margins show hierarchy */
-	.toc > li			{ font-weight: bold;   }
-	.toc > li li		 { font-weight: normal; }
-	.toc > li li li	  { font-size:   95%;	}
-	.toc > li li li li	{ font-size:   90%;	}
-	.toc > li li li li li { font-size:   85%;	}
-
-	/* @supports not (display:grid) { */
-		.toc > li			{ margin: 1.5rem 0;	}
-		.toc > li li		 { margin: 0.3rem 0;	}
-		.toc > li li li	  { margin-left: 2rem;   }
-
-		/* Section numbers in a column of their own */
-		.toc .secno {
-			float: left;
-			width: 4rem;
-			white-space: nowrap;
-		}
-		.toc > li li li li .secno { font-size: 85%; }
-		.toc > li li li li li .secno { font-size: 100%; }
-
-		.toc li {
-			clear: both;
-		}
-
-		:not(li) > .toc			 { margin-left:  5rem; }
-		.toc .secno				 { margin-left: -5rem; }
-		.toc > li li li .secno	  { margin-left: -7rem; }
-		.toc > li li li li .secno	{ margin-left: -9rem; }
-		.toc > li li li li li .secno { margin-left: -11rem; }
-
-		/* Tighten up indentation in narrow ToCs */
-		@media (max-width: 30em) {
-			:not(li) > .toc			 { margin-left:  4rem; }
-			.toc .secno				 { margin-left: -4rem; }
-			.toc > li li li			 { margin-left:  1rem; }
-			.toc > li li li .secno	  { margin-left: -5rem; }
-			.toc > li li li li .secno	{ margin-left: -6rem; }
-			.toc > li li li li li .secno { margin-left: -7rem; }
-		}
-		/* Loosen it on wide screens */
-		@media screen and (min-width: 78em) {
-			body:not(.toc-inline) :not(li) > .toc			 { margin-left:  4rem; }
-			body:not(.toc-inline) .toc .secno				 { margin-left: -4rem; }
-			body:not(.toc-inline) .toc > li li li			 { margin-left:  1rem; }
-			body:not(.toc-inline) .toc > li li li .secno	  { margin-left: -5rem; }
-			body:not(.toc-inline) .toc > li li li li .secno	{ margin-left: -6rem; }
-			body:not(.toc-inline) .toc > li li li li li .secno { margin-left: -7rem; }
-	}
-	/* } */
-
-	@supports (display:grid) and (display:contents) {
-		/* Use #toc over .toc to override non-@supports rules. */
-		#toc {
-			display: grid;
-			align-content: start;
-			grid-template-columns: auto 1fr;
-			grid-column-gap: 1rem;
-			column-gap: 1rem;
-			grid-row-gap: .6rem;
-			row-gap: .6rem;
-		}
-		#toc h2 {
-			grid-column: 1 / -1;
-			margin-bottom: 0;
-		}
-		#toc ol,
-		#toc li,
-		#toc a {
-			display: contents;
-			/* Switch <a> to subgrid when supported */
-		}
-		#toc span {
-			margin: 0;
-		}
-		#toc > .toc > li > a > span {
-			/* The spans of the top-level list,
-			  comprising the first items of each top-level section. */
-			margin-top: 1.1rem;
-		}
-		#toc#toc .secno { /* Ugh, need more specificity to override base.css */
-			grid-column: 1;
-			width: auto;
-			margin-left: 0;
-		}
-		#toc .content {
-			grid-column: 2;
-			width: auto;
-			margin-right: 1rem;
-			border-bottom: 3px solid transparent;
-			margin-bottom: -3px;
-		}
-		#toc .content:hover,
-		#toc .content:focus {
-			background: rgba(75%, 75%, 75%, .25);
-			background: var(--a-hover-bg);
-			border-bottom-color: #054572;
-			border-bottom-color: var(--toclink-underline);
-		}
-		#toc li li li .content {
-			margin-left: 1rem;
-		}
-		#toc li li li li .content {
-			margin-left: 2rem;
-		}
-	}
-
-
-/** Index *********************************************************************/
-
-	/* Index Lists: Layout */
-	ul.index	  { margin-left: 0; columns: 15em; text-indent: 1em hanging; }
-	ul.index li	{ margin-left: 0; list-style: none; break-inside: avoid; }
-	ul.index li li { margin-left: 1em; }
-	ul.index dl	{ margin-top: 0; }
-	ul.index dt	{ margin: .2em 0 .2em 20px;}
-	ul.index dd	{ margin: .2em 0 .2em 40px;}
-	/* Index Lists: Typography */
-	ul.index ul,
-	ul.index dl { font-size: smaller; }
-	@media not print {
-		ul.index li a + span {
-			white-space: nowrap;
-			color: transparent; }
-		ul.index li a:hover + span,
-		ul.index li a:focus + span {
-			color: #707070;
-			color: var(--indexinfo-text);
-		}
-	}
-
-/** Index Tables *****************************************************/
-	/* See also the data table styling section, which this effectively subclasses */
-
-	table.index {
-		font-size: small;
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-		border-spacing: 0;
-		text-align: left;
-		margin: 1em 0;
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-	table.index td,
-	table.index th {
-		padding: 0.4em;
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-	table.index tr:hover td:not([rowspan]),
-	table.index tr:hover th:not([rowspan]) {
-		color: black;
-		color: var(--indextable-hover-text);
-		background: #f7f8f9;
-		background: var(--indextable-hover-bg);
-	}
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-	/* The link in the first column in the property table (formerly a TD) */
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-		font-weight: bold;
-	}
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-/** Outdated warning **********************************************************/
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-.outdated-spec {
-	color: black;
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-.outdated-warning {
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-	box-shadow: 0 0 1em var(--outdated-shadow);
-	padding: 2em;
-	text-align: center;
-	z-index: 2;
-}
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-.outdated-warning a {
-	color: currentcolor;
-	background: transparent;
-}
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-.edited-rec-warning {
-	background: darkorange;
-	background: var(--editedrec-bg);
-	box-shadow: 0 0 1em;
-}
-
-.outdated-warning button {
-	color: var(--outdated-text);
-	border-radius: 1em;
-	box-shadow: 0 0 1em red;
-	box-shadow: 0 0 1em var(--outdated-shadow);
-	padding: 2em;
-	text-align: center;
-	z-index: 2;
-}
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-.outdated-warning a {
-	color: currentcolor;
-	background: transparent;
-}
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-.edited-rec-warning {
-	background: darkorange;
-	background: var(--editedrec-bg);
-	box-shadow: 0 0 1em;
-}
-
-.outdated-warning button {
-	position: absolute;
-	top: 0;
-	right:0;
-	margin: 0;
-	border: 0;
-	padding: 0.25em 0.5em;
-	background: transparent;
-	color: white;
-	color: var(--outdated-text);
-	font:1em sans-serif;
-	text-align:center;
-}
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-.outdated-warning span {
-	display: block;
-}
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-.outdated-collapsed {
-	bottom: 0;
-	border-radius: 0;
-	width: 100%;
-	padding: 0;
-}
-
-/******************************************************************************/
-/*                                    Print                                   */
-/******************************************************************************/
-
-	@media print {
-		/* Pages have their own margins. */
-		html {
-			margin: 0;
-		}
-		/* Serif for print. */
-		body {
-			font-family: serif;
-		}
-
-		.outdated-warning {
-			position: absolute;
-			border-style: solid;
-			border-color: red;
-		}
-
-		.outdated-warning input {
-			display: none;
-		}
-	}
-	@page {
-		margin: 1.5cm 1.1cm;
-	}
-
-
-
-/******************************************************************************/
-/*                             Overflow Control                               */
-/******************************************************************************/
-
-	.figure .caption, .sidefigure .caption, figcaption {
-		/* in case figure is overlarge, limit caption to 50em */
-		max-width: 50rem;
-		margin-left: auto;
-		margin-right: auto;
-	}
-	.overlarge {
-		/* Magic to create good item positioning:
-		  "content column" is 50ems wide at max; less on smaller screens.
-		  Extra space (after ToC + content) is empty on the right.
-
-		  1. When item < content column, centers item in column.
-		  2. When content < item < available, left-aligns.
-		  3. When item > available, fills available + scroll bar.
-		*/
-		display: grid;
-		grid-template-columns: minmax(0, 50em);
-	}
-	.overlarge > table {
-		/* limit preferred width of table */
-		max-width: 50em;
-		margin-left: auto;
-		margin-right: auto;
-	}
-
-	@media (min-width: 55em) {
-		.overlarge {
-			margin-right: calc(13px + 26.5rem - 50vw);
-			max-width: none;
-		}
-	}
-	@media screen and (min-width: 78em) {
-		body:not(.toc-inline) .overlarge {
-			/* 30.5em body padding 50em content area */
-			margin-right: calc(40em - 50vw) !important;
-		}
-	}
-	@media screen and (min-width: 90em) {
-		body:not(.toc-inline) .overlarge {
-			/* 4em html margin 30.5em body padding 50em content area */
-			margin-right: calc(84.5em - 100vw) !important;
-		}
-	}
-
-	@media not print {
-		.overlarge {
-			overflow-x: auto;
-			/* See Lea Verou's explanation background-attachment:
-			* http://lea.verou.me/2012/04/background-attachment-local/
-			*
-			background: top left  / 4em 100% linear-gradient(to right,  #ffffff, rgba(255, 255, 255, 0)) local,
-						top right / 4em 100% linear-gradient(to left, #ffffff, rgba(255, 255, 255, 0)) local,
-						top left  / 1em 100% linear-gradient(to right,  #c3c3c5, rgba(195, 195, 197, 0)) scroll,
-						top right / 1em 100% linear-gradient(to left, #c3c3c5, rgba(195, 195, 197, 0)) scroll,
-						white;
-			background-repeat: no-repeat;
-			*/
-		}
-	}
-</style>
-  <meta content="Bikeshed version d9bd89757, updated Thu Mar 23 10:06:53 2023 -0700" name="generator">
-  <link href="https://aomediacodec.github.io/av1-isobmff/" rel="canonical">
-  <meta content="61b1746fa5bbc0b94100eab194bef5961db1c4b6" name="document-revision">
-<style>/* style-autolinks */
-.css.css, .property.property, .descriptor.descriptor {
-    color: var(--a-normal-text);
-    font-size: inherit;
-    font-family: inherit;
-}
-.css::before, .property::before, .descriptor::before {
-    content: "‘";
-}
-.css::after, .property::after, .descriptor::after {
-    content: "’";
-}
-.property, .descriptor {
-    /* Don't wrap property and descriptor names */
-    white-space: nowrap;
-}
-.type { /* CSS value <type> */
-    font-style: italic;
-}
-pre .property::before, pre .property::after {
-    content: "";
-}
-[data-link-type="property"]::before,
-[data-link-type="propdesc"]::before,
-[data-link-type="descriptor"]::before,
-[data-link-type="value"]::before,
-[data-link-type="function"]::before,
-[data-link-type="at-rule"]::before,
-[data-link-type="selector"]::before,
-[data-link-type="maybe"]::before {
-    content: "‘";
-}
-[data-link-type="property"]::after,
-[data-link-type="propdesc"]::after,
-[data-link-type="descriptor"]::after,
-[data-link-type="value"]::after,
-[data-link-type="function"]::after,
-[data-link-type="at-rule"]::after,
-[data-link-type="selector"]::after,
-[data-link-type="maybe"]::after {
-    content: "’";
-}
-
-[data-link-type].production::before,
-[data-link-type].production::after,
-.prod [data-link-type]::before,
-.prod [data-link-type]::after {
-    content: "";
-}
-
-[data-link-type=element],
-[data-link-type=element-attr] {
-    font-family: Menlo, Consolas, "DejaVu Sans Mono", monospace;
-    font-size: .9em;
-}
-[data-link-type=element]::before { content: "<" }
-[data-link-type=element]::after  { content: ">" }
-
-[data-link-type=biblio] {
-    white-space: pre;
-}
-</style>
-<style>/* style-colors */
-
-/* Any --*-text not paired with a --*-bg is assumed to have a transparent bg */
-:root {
-    color-scheme: light dark;
-
-    --text: black;
-    --bg: white;
-
-    --unofficial-watermark: url(https://www.w3.org/StyleSheets/TR/2016/logos/UD-watermark);
-
-    --logo-bg: #1a5e9a;
-    --logo-active-bg: #c00;
-    --logo-text: white;
-
-    --tocnav-normal-text: #707070;
-    --tocnav-normal-bg: var(--bg);
-    --tocnav-hover-text: var(--tocnav-normal-text);
-    --tocnav-hover-bg: #f8f8f8;
-    --tocnav-active-text: #c00;
-    --tocnav-active-bg: var(--tocnav-normal-bg);
-
-    --tocsidebar-text: var(--text);
-    --tocsidebar-bg: #f7f8f9;
-    --tocsidebar-shadow: rgba(0,0,0,.1);
-    --tocsidebar-heading-text: hsla(203,20%,40%,.7);
-
-    --toclink-text: var(--text);
-    --toclink-underline: #3980b5;
-    --toclink-visited-text: var(--toclink-text);
-    --toclink-visited-underline: #054572;
-
-    --heading-text: #005a9c;
-
-    --hr-text: var(--text);
-
-    --algo-border: #def;
-
-    --del-text: red;
-    --del-bg: transparent;
-    --ins-text: #080;
-    --ins-bg: transparent;
-
-    --a-normal-text: #034575;
-    --a-normal-underline: #bbb;
-    --a-visited-text: var(--a-normal-text);
-    --a-visited-underline: #707070;
-    --a-hover-bg: rgba(75%, 75%, 75%, .25);
-    --a-active-text: #c00;
-    --a-active-underline: #c00;
-
-    --blockquote-border: silver;
-    --blockquote-bg: transparent;
-    --blockquote-text: currentcolor;
-
-    --issue-border: #e05252;
-    --issue-bg: #fbe9e9;
-    --issue-text: var(--text);
-    --issueheading-text: #831616;
-
-    --example-border: #e0cb52;
-    --example-bg: #fcfaee;
-    --example-text: var(--text);
-    --exampleheading-text: #574b0f;
-
-    --note-border: #52e052;
-    --note-bg: #e9fbe9;
-    --note-text: var(--text);
-    --noteheading-text: hsl(120, 70%, 30%);
-    --notesummary-underline: silver;
-
-    --assertion-border: #aaa;
-    --assertion-bg: #eee;
-    --assertion-text: black;
-
-    --advisement-border: orange;
-    --advisement-bg: #fec;
-    --advisement-text: var(--text);
-    --advisementheading-text: #b35f00;
-
-    --warning-border: red;
-    --warning-bg: hsla(40,100%,50%,0.95);
-    --warning-text: var(--text);
-
-    --amendment-border: #330099;
-    --amendment-bg: #F5F0FF;
-    --amendment-text: var(--text);
-    --amendmentheading-text: #220066;
-
-    --def-border: #8ccbf2;
-    --def-bg: #def;
-    --def-text: var(--text);
-    --defrow-border: #bbd7e9;
-
-    --datacell-border: silver;
-
-    --indexinfo-text: #707070;
-
-    --indextable-hover-text: black;
-    --indextable-hover-bg: #f7f8f9;
-
-    --outdatedspec-bg: rgba(0, 0, 0, .5);
-    --outdatedspec-text: black;
-    --outdated-bg: maroon;
-    --outdated-text: white;
-    --outdated-shadow: red;
-
-    --editedrec-bg: darkorange;
-}
-</style>
-<style>/* style-counters */
-body {
-    counter-reset: example figure issue;
-}
-.issue {
-    counter-increment: issue;
-}
-.issue:not(.no-marker)::before {
-    content: "Issue " counter(issue);
-}
-
-.example {
-    counter-increment: example;
-}
-.example:not(.no-marker)::before {
-    content: "Example " counter(example);
-}
-.invalid.example:not(.no-marker)::before,
-.illegal.example:not(.no-marker)::before {
-    content: "Invalid Example" counter(example);
-}
-
-figcaption {
-    counter-increment: figure;
-}
-figcaption:not(.no-marker)::before {
-    content: "Figure " counter(figure) " ";
-}
-</style>
-<style>/* style-dfn-panel */
-:root {
-    --dfnpanel-bg: #ddd;
-    --dfnpanel-text: var(--text);
-}
-.dfn-panel {
-    position: absolute;
-    z-index: 35;
-    width: 20em;
-    min-width: min-content;
-    max-width: 300px;
-    height: auto;
-    max-height: 500px;
-    overflow: auto;
-    padding: 0.5em 0.75em;
-    font: small Helvetica Neue, sans-serif, Droid Sans Fallback;
-    background: var(--dfnpanel-bg);
-    color: var(--dfnpanel-text);
-    border: outset 0.2em;
-    white-space: normal; /* in case it's moved into a pre */
-}
-.dfn-panel:not(.on) { display: none; }
-.dfn-panel * { margin: 0; padding: 0; text-indent: 0; }
-.dfn-panel > b { display: block; }
-.dfn-panel a { color: var(--dfnpanel-text); }
-.dfn-panel a:not(:hover) { text-decoration: none !important; border-bottom: none !important; }
-.dfn-panel > b + b { margin-top: 0.25em; }
-.dfn-panel ul { padding: 0; }
-.dfn-panel li { list-style: inside; }
-.dfn-panel.activated {
-    display: inline-block;
-    position: fixed;
-    left: .5em;
-    bottom: 2em;
-    margin: 0 auto;
-    max-width: calc(100vw - 1.5em - .4em - .5em);
-    max-height: 30vh;
-}
-
-.dfn-paneled { cursor: pointer; }
-</style>
-<style>/* style-issues */
-a[href].issue-return {
-    float: right;
-    float: inline-end;
-    color: var(--issueheading-text);
-    font-weight: bold;
-    text-decoration: none;
-}
-</style>
-<style>/* style-md-lists */
-/* This is a weird hack for me not yet following the commonmark spec
-   regarding paragraph and lists. */
-[data-md] > :first-child {
-    margin-top: 0;
-}
-[data-md] > :last-child {
-    margin-bottom: 0;
-}
-</style>
-<style>/* style-selflinks */
-
-:root {
-    --selflink-text: white;
-    --selflink-bg: gray;
-    --selflink-hover-text: black;
-}
-.heading, .issue, .note, .example, li, dt {
-    position: relative;
-}
-a.self-link {
-    position: absolute;
-    top: 0;
-    left: calc(-1 * (3.5rem - 26px));
-    width: calc(3.5rem - 26px);
-    height: 2em;
-    text-align: center;
-    border: none;
-    transition: opacity .2s;
-    opacity: .5;
-}
-a.self-link:hover {
-    opacity: 1;
-}
-.heading > a.self-link {
-    font-size: 83%;
-}
-.example > a.self-link,
-.note > a.self-link,
-.issue > a.self-link {
-    /* These blocks are overflow:auto, so positioning outside
-       doesn't work. */
-    left: auto;
-    right: 0;
-}
-li > a.self-link {
-    left: calc(-1 * (3.5rem - 26px) - 2em);
-}
-dfn > a.self-link {
-    top: auto;
-    left: auto;
-    opacity: 0;
-    width: 1.5em;
-    height: 1.5em;
-    background: var(--selflink-bg);
-    color: var(--selflink-text);
-    font-style: normal;
-    transition: opacity .2s, background-color .2s, color .2s;
-}
-dfn:hover > a.self-link {
-    opacity: 1;
-}
-dfn > a.self-link:hover {
-    color: var(--selflink-hover-text);
-}
-
-a.self-link::before            { content: "¶"; }
-.heading > a.self-link::before { content: "§"; }
-dfn > a.self-link::before      { content: "#"; }
-</style>
-<style>/* style-darkmode */
-
-@media (prefers-color-scheme: dark) {
-    :root {
-        --text: #ddd;
-        --bg: black;
-
-        --unofficial-watermark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='400' height='400'%3E%3Cg fill='%23100808' transform='translate(200 200) rotate(-45) translate(-200 -200)' stroke='%23100808' stroke-width='3'%3E%3Ctext x='50%25' y='220' style='font: bold 70px sans-serif; text-anchor: middle; letter-spacing: 6px;'%3EUNOFFICIAL%3C/text%3E%3Ctext x='50%25' y='305' style='font: bold 70px sans-serif; text-anchor: middle; letter-spacing: 6px;'%3EDRAFT%3C/text%3E%3C/g%3E%3C/svg%3E");
-
-        --logo-bg: #1a5e9a;
-        --logo-active-bg: #c00;
-        --logo-text: white;
-
-        --tocnav-normal-text: #999;
-        --tocnav-normal-bg: var(--bg);
-        --tocnav-hover-text: var(--tocnav-normal-text);
-        --tocnav-hover-bg: #080808;
-        --tocnav-active-text: #f44;
-        --tocnav-active-bg: var(--tocnav-normal-bg);
-
-        --tocsidebar-text: var(--text);
-        --tocsidebar-bg: #080808;
-        --tocsidebar-shadow: rgba(255,255,255,.1);
-        --tocsidebar-heading-text: hsla(203,20%,40%,.7);
-
-        --toclink-text: var(--text);
-        --toclink-underline: #6af;
-        --toclink-visited-text: var(--toclink-text);
-        --toclink-visited-underline: #054572;
-
-        --heading-text: #8af;
-
-        --hr-text: var(--text);
-
-        --algo-border: #456;
-
-        --del-text: #f44;
-        --del-bg: transparent;
-        --ins-text: #4a4;
-        --ins-bg: transparent;
-
-        --a-normal-text: #6af;
-        --a-normal-underline: #555;
-        --a-visited-text: var(--a-normal-text);
-        --a-visited-underline: var(--a-normal-underline);
-        --a-hover-bg: rgba(25%, 25%, 25%, .2);
-        --a-active-text: #f44;
-        --a-active-underline: var(--a-active-text);
-
-        --borderedblock-bg: rgba(255, 255, 255, .05);
-
-        --blockquote-border: silver;
-        --blockquote-bg: var(--borderedblock-bg);
-        --blockquote-text: currentcolor;
-
-        --issue-border: #e05252;
-        --issue-bg: var(--borderedblock-bg);
-        --issue-text: var(--text);
-        --issueheading-text: hsl(0deg, 70%, 70%);
-
-        --example-border: hsl(50deg, 90%, 60%);
-        --example-bg: var(--borderedblock-bg);
-        --example-text: var(--text);
-        --exampleheading-text: hsl(50deg, 70%, 70%);
-
-        --note-border: hsl(120deg, 100%, 35%);
-        --note-bg: var(--borderedblock-bg);
-        --note-text: var(--text);
-        --noteheading-text: hsl(120, 70%, 70%);
-        --notesummary-underline: silver;
-
-        --assertion-border: #444;
-        --assertion-bg: var(--borderedblock-bg);
-        --assertion-text: var(--text);
-
-        --advisement-border: orange;
-        --advisement-bg: #222218;
-        --advisement-text: var(--text);
-        --advisementheading-text: #f84;
-
-        --warning-border: red;
-        --warning-bg: hsla(40,100%,20%,0.95);
-        --warning-text: var(--text);
-
-        --amendment-border: #330099;
-        --amendment-bg: #080010;
-        --amendment-text: var(--text);
-        --amendmentheading-text: #cc00ff;
-
-        --def-border: #8ccbf2;
-        --def-bg: #080818;
-        --def-text: var(--text);
-        --defrow-border: #136;
-
-        --datacell-border: silver;
-
-        --indexinfo-text: #aaa;
-
-        --indextable-hover-text: var(--text);
-        --indextable-hover-bg: #181818;
-
-        --outdatedspec-bg: rgba(255, 255, 255, .5);
-        --outdatedspec-text: black;
-        --outdated-bg: maroon;
-        --outdated-text: white;
-        --outdated-shadow: red;
-
-        --editedrec-bg: darkorange;
-    }
-    /* In case a transparent-bg image doesn't expect to be on a dark bg,
-       which is quite common in practice... */
-    img { background: white; }
-}
-
-@media (prefers-color-scheme: dark) {
-    :root {
-        --selflink-text: black;
-        --selflink-bg: silver;
-        --selflink-hover-text: white;
-    }
-}
-
-@media (prefers-color-scheme: dark) {
-    :root {
-        --dfnpanel-bg: #222;
-        --dfnpanel-text: var(--text);
-    }
-}
-</style>
- <body class="h-entry">
-  <div class="head">
-   <p data-fill-with="logo"><a class="logo" href="https://www.aomedia.org/" style="width: 200px"> <img alt="AOM" height="60" src="https://aomedia.org/assets/images/aomedia-logo-rgb.svg" width="200"> </a> </p>
-   <h1 class="p-name no-ref" id="title">AV1 Codec ISO Media File Format Binding</h1>
-   <h2 class="p-name no-num no-toc no-ref heading settled" id="subtitle"><span class="content">v1.2.0</span></h2>
-   <h3 class="no-num no-toc no-ref heading settled" id="profile-and-date"><span class="content">AOM Final Deliverable, <time class="dt-updated" datetime="2019-12-12">12 December 2019</time></span></h3>
-   <div data-fill-with="spec-metadata">
-    <dl>
-     <dt>This version:
-     <dd><a class="u-url" href="https://aomediacodec.github.io/av1-isobmff/">https://aomediacodec.github.io/av1-isobmff/</a>
-     <dt>Issue Tracking:
-     <dd><a href="https://github.com/AOMediaCodec/av1-isobmff/issues/">GitHub</a>
-     <dt class="editor">Editors:
-     <dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:cconcolato@netflix.com">Cyril Concolato</a> (<span class="p-org org">Netflix</span>)
-     <dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:tom.finegan@google.com">Tom Finegan</a> (<span class="p-org org">Google</span>)
-     <dt>Previously approved version:
-     <dd><a href="v1.1.0.html">v1.1.0</a>
-    </dl>
-   </div>
-   <div data-fill-with="warning"></div>
-   <p class="copyright" data-fill-with="copyright">
-    <p>Copyright 2019, <a href="https://aomedia.org">AOM</a></p>
-    <p>Licensing information is available at <a href="http://aomedia.org/license/">http://aomedia.org/license/</a></p>
-    <p>The MATERIALS ARE PROVIDED “AS IS.” The Alliance for Open Media, its members, and its contributors expressly disclaim any warranties (express, implied, or otherwise), including implied warranties of merchantability, non-infringement, fitness for a particular purpose, or title, related to the materials. The entire risk as to implementing or otherwise using the materials is assumed by the implementer and user. IN NO EVENT WILL THE ALLIANCE FOR OPEN MEDIA, ITS MEMBERS, OR CONTRIBUTORS BE LIABLE TO ANY OTHER PARTY FOR LOST PROFITS OR ANY FORM OF INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OF ANY CHARACTER FROM ANY CAUSES OF ACTION OF ANY KIND WITH RESPECT TO THIS DELIVERABLE OR ITS GOVERNING AGREEMENT, WHETHER BASED ON BREACH OF CONTRACT, TORT (INCLUDING NEGLIGENCE), OR OTHERWISE, AND WHETHER OR NOT THE OTHER MEMBER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</p>
-   </p>
-   <hr title="Separator for header">
-  </div>
-  <div class="p-summary" data-fill-with="abstract">
-   <h2 class="no-num no-toc no-ref heading settled" id="abstract"><span class="content">Abstract</span></h2>
-   <p>This document specifies the storage format for <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a> bitstreams in <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a> tracks as well as in <a data-link-type="biblio" href="#biblio-cmaf" title="Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media">[CMAF]</a> files.</p>
-  </div>
-  <nav data-fill-with="table-of-contents" id="toc">
-   <h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
-   <ol class="toc" role="directory">
-    <li><a href="#bitstream-overview"><span class="secno">1</span> <span class="content">Bitstream features overview</span></a>
-    <li>
-     <a href="#basic-encapsulation"><span class="secno">2</span> <span class="content">Basic Encapsulation Scheme</span></a>
-     <ol class="toc">
-      <li><a href="#brands"><span class="secno">2.1</span> <span class="content">General Requirements &amp; Brands</span></a>
-      <li>
-       <a href="#av1sampleentry-section"><span class="secno">2.2</span> <span class="content">AV1 Sample Entry</span></a>
-       <ol class="toc">
-        <li><a href="#av1sampleentry-definition"><span class="secno">2.2.1</span> <span class="content">Definition</span></a>
-        <li><a href="#av1sampleentry-description"><span class="secno">2.2.2</span> <span class="content">Description</span></a>
-        <li><a href="#av1sampleentry-syntax"><span class="secno">2.2.3</span> <span class="content">Syntax</span></a>
-        <li><a href="#av1sampleentry-semantics"><span class="secno">2.2.4</span> <span class="content">Semantics</span></a>
-       </ol>
-      <li>
-       <a href="#av1codecconfigurationbox-section"><span class="secno">2.3</span> <span class="content">AV1 Codec Configuration Box</span></a>
-       <ol class="toc">
-        <li><a href="#av1codecconfigurationbox-definition"><span class="secno">2.3.1</span> <span class="content">Definition</span></a>
-        <li><a href="#av1codecconfigurationbox-description"><span class="secno">2.3.2</span> <span class="content">Description</span></a>
-        <li><a href="#av1codecconfigurationbox-syntax"><span class="secno">2.3.3</span> <span class="content">Syntax</span></a>
-        <li><a href="#av1codecconfigurationbox-semantics"><span class="secno">2.3.4</span> <span class="content">Semantics</span></a>
-       </ol>
-      <li><a href="#sampleformat"><span class="secno">2.4</span> <span class="content">AV1 Sample Format</span></a>
-      <li>
-       <a href="#forwardkeyframesamplegroupentry"><span class="secno">2.5</span> <span class="content">AV1 Forward Key Frame sample group entry</span></a>
-       <ol class="toc">
-        <li><a href="#forwardkeyframesamplegroupentry-definition"><span class="secno">2.5.1</span> <span class="content">Definition</span></a>
-        <li><a href="#forwardkeyframesamplegroupentry-description"><span class="secno">2.5.2</span> <span class="content">Description</span></a>
-        <li><a href="#forwardkeyframesamplegroupentry-syntax"><span class="secno">2.5.3</span> <span class="content">Syntax</span></a>
-        <li><a href="#forwardkeyframesamplegroupentry-semantics"><span class="secno">2.5.4</span> <span class="content">Semantics</span></a>
-       </ol>
-      <li>
-       <a href="#multiframesamplegroupentry"><span class="secno">2.6</span> <span class="content">AV1 Multi-Frame sample group entry</span></a>
-       <ol class="toc">
-        <li><a href="#multiframesamplegroupentry-definition"><span class="secno">2.6.1</span> <span class="content">Definition</span></a>
-        <li><a href="#multiframesamplegroupentry-description"><span class="secno">2.6.2</span> <span class="content">Description</span></a>
-        <li><a href="#multiframesamplegroupentry-syntax"><span class="secno">2.6.3</span> <span class="content">Syntax</span></a>
-       </ol>
-      <li>
-       <a href="#switchframesamplegroupentry"><span class="secno">2.7</span> <span class="content">AV1 Switch Frame sample group entry</span></a>
-       <ol class="toc">
-        <li><a href="#switchframesamplegroupentry-definition"><span class="secno">2.7.1</span> <span class="content">Definition</span></a>
-        <li><a href="#switchframesamplegroupentry-description"><span class="secno">2.7.2</span> <span class="content">Description</span></a>
-        <li><a href="#switchframesamplegroupentry-syntax"><span class="secno">2.7.3</span> <span class="content">Syntax</span></a>
-       </ol>
-      <li>
-       <a href="#metadatasamplegroupentry"><span class="secno">2.8</span> <span class="content">AV1 Metadata sample group entry</span></a>
-       <ol class="toc">
-        <li><a href="#metadatasamplegroupentry-definition"><span class="secno">2.8.1</span> <span class="content">Definition</span></a>
-        <li><a href="#metadatasamplegroupentry-description"><span class="secno">2.8.2</span> <span class="content">Description</span></a>
-        <li><a href="#metadatasamplegroupentry-syntax"><span class="secno">2.8.3</span> <span class="content">Syntax</span></a>
-        <li><a href="#metadatasamplegroupentry-semantics"><span class="secno">2.8.4</span> <span class="content">Semantics</span></a>
-       </ol>
-     </ol>
-    <li><a href="#cmaf"><span class="secno">3</span> <span class="content">CMAF AV1 track format</span></a>
-    <li>
-     <a href="#CommonEncryption"><span class="secno">4</span> <span class="content">Common Encryption</span></a>
-     <ol class="toc">
-      <li><a href="#subsample-encryption"><span class="secno">4.1</span> <span class="content">General Subsample Encryption constraints</span></a>
-      <li><a href="#subsample-encryption-illustration"><span class="secno">4.2</span> <span class="content">Subsample Encryption Illustration</span></a>
-     </ol>
-    <li><a href="#codecsparam"><span class="secno">5</span> <span class="content">Codecs Parameter String</span></a>
-    <li><a href="#changelist"><span class="secno">6</span> <span class="content">Changes since v1.1.0 release</span></a>
-    <li><a href="#conformance"><span class="secno"></span> <span class="content"> Conformance</span></a>
-    <li>
-     <a href="#index"><span class="secno"></span> <span class="content">Index</span></a>
-     <ol class="toc">
-      <li><a href="#index-defined-here"><span class="secno"></span> <span class="content">Terms defined by this specification</span></a>
-      <li><a href="#index-defined-elsewhere"><span class="secno"></span> <span class="content">Terms defined by reference</span></a>
-     </ol>
-    <li>
-     <a href="#references"><span class="secno"></span> <span class="content">References</span></a>
-     <ol class="toc">
-      <li><a href="#normative"><span class="secno"></span> <span class="content">Normative References</span></a>
-     </ol>
-   </ol>
-  </nav>
-  <main>
-   <h2 class="heading settled" data-level="1" id="bitstream-overview"><span class="secno">1. </span><span class="content">Bitstream features overview</span><a class="self-link" href="#bitstream-overview"></a></h2>
-    An <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1" id="ref-for-page=1">AV1 bitstream</a> is composed of a sequence of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39">OBUs</a>, grouped into <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13">Temporal Units</a>. 
-   <p>OBUs are made of a 1 or 2 bytes header, identifying in particular the type of OBU, followed by an optional length field and by an optional payload, whose presence and content depend on the OBU type. Depending on its type, an OBU can carry configuration information, metadata, or coded video data.</p>
-   <p class="note" role="note"><span class="marker">NOTE:</span> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121">Tile List OBUs</a> defined in the <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a> specification are not supported in the current version of this specification. A future version of the specification may do so.</p>
-   <p>Temporal Units are processed by a decoder in the order given by the bitstream. Each Temporal Unit is associated with a presentation time. Some Temporal Units may contain multiple frames to be decoded but only one is presented.</p>
-   <p class="note" role="note"><span class="marker">NOTE:</span> The AV1 specification defines scalability features, allowing frames from multiple layers or operating points to be present in a single temporal unit. This version of storage in ISOBMFF supports the simple storage of scalable streams in a single track, but does not specify advanced tools for handling multi-track support, layer extraction, or other scalability related use cases. A future version of the specification may do so.</p>
-   <p>Frames carried in Temporal Units may have coding dependencies on frames carried previously in the same Temporal Unit or in previous Temporal Units. Frames that can be decoded without dependencies to previous frames are of two categories: <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13①">Key Frames</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13②">Intra-only Frames</a>. Frames that cannot be decoded independently are of three categories: <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13③">Inter Frames</a>, <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13④">Switch Frames</a>, and frames with a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2">show_existing_frame</a> flag set to 1.</p>
-   <p>Key Frames with the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①">show_frame</a> flag set to 1 have the additional property that after decoding the Key Frame, all frames following the Key Frame in the bitstream can be decoded. They are called <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206">Random Access Points</a> in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a>.</p>
-   <p>Key Frames with the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②">show_frame</a> flag set to 0 are called <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206①">Delayed Random Access Points</a>. <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206②">Delayed Random Access Points</a> have the additional property that if a future <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206③">Key Frame Dependent Recovery Point</a> exists, all frames following that <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206④">Key Frame Dependent Recovery Point</a> can be decoded. A <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑤">Key Frame Dependent Recovery Point</a> is a frame with <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2③">show_existing_frame</a> set to 1 that refers to a previous <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑥">Delayed Random Access Points</a>.</p>
-   <h2 class="heading settled" data-level="2" id="basic-encapsulation"><span class="secno">2. </span><span class="content">Basic Encapsulation Scheme</span><a class="self-link" href="#basic-encapsulation"></a></h2>
-   <p>This section describes the basic data structures used to signal encapsulation of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1" id="ref-for-page=1①">AV1 bitstreams</a> in <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a> containers.</p>
-   <h3 class="heading settled" data-level="2.1" id="brands"><span class="secno">2.1. </span><span class="content">General Requirements &amp; Brands</span><a class="self-link" href="#brands"></a></h3>
-   <p>A file conformant to this specification satisfies the following:</p>
-   <ul>
-    <li data-md>
-     <p>It SHALL conform to the normative requirements of <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a></p>
-    <li data-md>
-     <p>It SHALL have the <dfn class="css" data-dfn-for="ISOBMFF Brand" data-dfn-type="value" data-export id="valdef-isobmff-brand-av01">av01<a class="self-link" href="#valdef-isobmff-brand-av01"></a></dfn> brand among the compatible brands array of the FileTypeBox</p>
-    <li data-md>
-     <p>It SHALL contain at least one track using an <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry">AV1SampleEntry</a></p>
-    <li data-md>
-     <p>It SHOULD indicate a structural ISOBMFF brand among the compatible brands array of the FileTypeBox, such as <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006">iso6</a></p>
-    <li data-md>
-     <p>It MAY indicate CMAF brands as specified in <a href="#cmaf">§ 3 CMAF AV1 track format</a></p>
-    <li data-md>
-     <p>It MAY indicate other brands not specified in this document provided that the associated requirements do not conflict with those given in this specification</p>
-   </ul>
-   <p>Parsers SHALL support the structures required by the <code><a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①">iso6</a></code> brand and MAY support structures required by further ISOBMFF structural brands.</p>
-   <h3 class="heading settled" data-level="2.2" id="av1sampleentry-section"><span class="secno">2.2. </span><span class="content">AV1 Sample Entry</span><a class="self-link" href="#av1sampleentry-section"></a></h3>
-   <h4 class="heading settled" data-level="2.2.1" id="av1sampleentry-definition"><span class="secno">2.2.1. </span><span class="content">Definition</span><a class="self-link" href="#av1sampleentry-definition"></a></h4>
-<pre class="def">Sample Entry Type: <dfn data-dfn-for="AV1SampleEntry" data-dfn-type="value" data-export id="valdef-av1sampleentry-av01">av01<a class="self-link" href="#valdef-av1sampleentry-av01"></a></dfn>
-Container:         Sample Description Box ('stsd')
-Mandatory:         Yes
-Quantity:          One or more.
-</pre>
-   <h4 class="heading settled" data-level="2.2.2" id="av1sampleentry-description"><span class="secno">2.2.2. </span><span class="content">Description</span><a class="self-link" href="#av1sampleentry-description"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1sampleentry">AV1SampleEntry</dfn> sample entry identifies that the track contains <a data-link-type="dfn" href="#av1-sample" id="ref-for-av1-sample">AV1 Samples</a>, and uses an <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox">AV1CodecConfigurationBox</a>.</p>
-   <h4 class="heading settled" data-level="2.2.3" id="av1sampleentry-syntax"><span class="secno">2.2.3. </span><span class="content">Syntax</span><a class="self-link" href="#av1sampleentry-syntax"></a></h4>
-<pre>class AV1SampleEntry extends VisualSampleEntry('av01') {
-  AV1CodecConfigurationBox config;
-}
-</pre>
-   <h4 class="heading settled" data-level="2.2.4" id="av1sampleentry-semantics"><span class="secno">2.2.4. </span><span class="content">Semantics</span><a class="self-link" href="#av1sampleentry-semantics"></a></h4>
-   <p>The <dfn data-dfn-type="dfn" data-noexport id="width">width<a class="self-link" href="#width"></a></dfn> and <dfn data-dfn-type="dfn" data-noexport id="height">height<a class="self-link" href="#height"></a></dfn> fields of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006②">VisualSampleEntry</a> SHALL equal the values of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2④">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑤">max_frame_height_minus_1</a> + 1 of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41">Sequence Header OBU</a> applying to the samples associated with this sample entry.</p>
-   <p>The width and height in the TrackHeaderBox SHOULD equal, respectively, the maximum RenderWidth, called MaxRenderWidth, and the maximum RenderHeight, called MaxRenderHeight, of all the frames associated with this sample entry. Additionally, if MaxRenderWidth and MaxRenderHeight values do not equal respectively the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑥">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑦">max_frame_height_minus_1</a> + 1 values of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①">Sequence Header OBU</a>, a PixelAspectRatioBox box SHALL be present in the sample entry and set such that</p>
-<pre>hSpacing / vSpacing = MaxRenderWidth * (max_frame_height_minus_1 + 1) /
-                              ((max_frame_width_minus_1 + 1) * MaxRenderHeight)
-</pre>
-   <p>The <dfn data-dfn-type="dfn" data-noexport id="compressorname">compressorname<a class="self-link" href="#compressorname"></a></dfn> field of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006③">VisualSampleEntry</a> is an informative name. It is formatted in a fixed 32-byte field, with the first byte set to the number of bytes to be displayed, followed by that number of bytes of displayable data, followed by padding to complete 32 bytes total (including the size byte). The value "\012AOM Coding" is RECOMMENDED; the first byte is a count of the remaining bytes, here represented by \012, which (being octal 12) is decimal 10, the number of bytes in the rest of the string.</p>
-   <p class="note" role="note"><span class="marker">NOTE:</span> Parsers may ignore the value of the compressorname field. It is specified in this document simply for legacy and backwards compatibility reasons.</p>
-   <p>The <dfn data-dfn-type="dfn" data-noexport id="config">config<a class="self-link" href="#config"></a></dfn> field SHALL contain an <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox①">AV1CodecConfigurationBox</a> that applies to the samples associated with this sample entry.</p>
-   <p class="note" role="note"><span class="marker">NOTE:</span> Multiple instances of <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry①">AV1SampleEntry</a> may be required when the track contains samples requiring a <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox②">AV1CodecConfigurationBox</a> with different characteristics.</p>
-   <p>Optional boxes not specifically mentioned here can be present, in particular those indicated in the definition of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006④">VisualSampleEntry</a> in <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a>.</p>
-   <h3 class="heading settled" data-level="2.3" id="av1codecconfigurationbox-section"><span class="secno">2.3. </span><span class="content">AV1 Codec Configuration Box</span><a class="self-link" href="#av1codecconfigurationbox-section"></a></h3>
-   <h4 class="heading settled" data-level="2.3.1" id="av1codecconfigurationbox-definition"><span class="secno">2.3.1. </span><span class="content">Definition</span><a class="self-link" href="#av1codecconfigurationbox-definition"></a></h4>
-<pre class="def">Box Type:  <dfn data-dfn-type="dfn" data-export id="av1c">av1C<a class="self-link" href="#av1c"></a></dfn>
-Container: AV1 Sample Entry ('av01')
-Mandatory: Yes
-Quantity:  Exactly One
-</pre>
-   <h4 class="heading settled" data-level="2.3.2" id="av1codecconfigurationbox-description"><span class="secno">2.3.2. </span><span class="content">Description</span><a class="self-link" href="#av1codecconfigurationbox-description"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1codecconfigurationbox">AV1CodecConfigurationBox</dfn> contains decoder configuration information that SHALL be valid for every sample that references the sample entry.</p>
-   <h4 class="heading settled" data-level="2.3.3" id="av1codecconfigurationbox-syntax"><span class="secno">2.3.3. </span><span class="content">Syntax</span><a class="self-link" href="#av1codecconfigurationbox-syntax"></a></h4>
-<pre>class AV1CodecConfigurationBox extends Box('av1C'){
-  AV1CodecConfigurationRecord av1Config;
-}
-
-aligned (8) class AV1CodecConfigurationRecord {
-  unsigned int (1) marker = 1;
-  unsigned int (7) version = 1;
-  unsigned int (3) seq_profile;
-  unsigned int (5) seq_level_idx_0;
-  unsigned int (1) seq_tier_0;
-  unsigned int (1) high_bitdepth;
-  unsigned int (1) twelve_bit;
-  unsigned int (1) monochrome;
-  unsigned int (1) chroma_subsampling_x;
-  unsigned int (1) chroma_subsampling_y;
-  unsigned int (2) chroma_sample_position;
-  unsigned int (3) reserved = 0;
-
-  unsigned int (1) initial_presentation_delay_present;
-  if (initial_presentation_delay_present) {
-    unsigned int (4) initial_presentation_delay_minus_one;
-  } else {
-    unsigned int (4) reserved = 0;
-  }
-
-  unsigned int (8)[] configOBUs;
-}
-</pre>
-   <h4 class="heading settled" data-level="2.3.4" id="av1codecconfigurationbox-semantics"><span class="secno">2.3.4. </span><span class="content">Semantics</span><a class="self-link" href="#av1codecconfigurationbox-semantics"></a></h4>
-   <p>The <dfn data-dfn-type="dfn" data-export id="marker">marker<a class="self-link" href="#marker"></a></dfn> field SHALL be set to 1.</p>
-   <p class="note" role="note"><span class="marker">NOTE:</span> The marker bit ensures that the bit pattern of the first byte of the AV1CodecConfigurationRecord cannot be mistaken for an <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40" id="ref-for-page=40">OBU Header</a> byte.</p>
-   <p>The <dfn data-dfn-type="dfn" data-noexport id="version">version<a class="self-link" href="#version"></a></dfn> field indicates the version of the AV1CodecConfigurationRecord. The value SHALL be set to 1 for AV1CodecConfigurationRecord.</p>
-   <p>The <dfn data-dfn-type="dfn" data-export id="seq_profile">seq_profile<a class="self-link" href="#seq_profile"></a></dfn> field indicates the AV1 profile and SHALL be equal to the seq_profile value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②">Sequence Header OBU</a>.</p>
-   <p>The <dfn data-dfn-type="dfn" data-export id="seq_level_idx_0">seq_level_idx_0<a class="self-link" href="#seq_level_idx_0"></a></dfn> field indicates the value of seq_level_idx[0] found in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③">Sequence Header OBU</a> and SHALL be equal to the value of seq_level_idx[0] in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41④">Sequence Header OBU</a>.</p>
-   <p>The <dfn data-dfn-type="dfn" data-export id="seq_tier_0">seq_tier_0<a class="self-link" href="#seq_tier_0"></a></dfn> field indicates the value of seq_tier[0] found in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑤">Sequence Header OBU</a> and SHALL be equal to the value of seq_tier[0] in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑥">Sequence Header OBU</a>.</p>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="high_bitdepth">high_bitdepth</dfn> field indicates the value of the <a data-link-type="dfn" href="#high_bitdepth" id="ref-for-high_bitdepth">high_bitdepth</a> flag from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑦">Sequence Header OBU</a>.</p>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="twelve_bit">twelve_bit</dfn> field indicates the value of the <a data-link-type="dfn" href="#twelve_bit" id="ref-for-twelve_bit">twelve_bit</a> flag from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑧">Sequence Header OBU</a>. When twelve_bit is not present in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑨">Sequence Header OBU</a> the AV1CodecConfigurationRecord twelve_bit value SHALL be 0.</p>
-   <p>The <dfn data-dfn-type="dfn" data-export id="monochrome">monochrome<a class="self-link" href="#monochrome"></a></dfn> field indicates the value of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑧">mono_chrome</a> flag from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⓪">Sequence Header OBU</a>.</p>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="chroma_subsampling_x">chroma_subsampling_x</dfn> field indicates the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑨">subsampling_x</a> value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①①">Sequence Header OBU</a>.</p>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="chroma_subsampling_y">chroma_subsampling_y</dfn> field indicates the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⓪">subsampling_y</a> value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①②">Sequence Header OBU</a>.</p>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="chroma_sample_position">chroma_sample_position</dfn> field indicates the <a data-link-type="dfn" href="#chroma_sample_position" id="ref-for-chroma_sample_position">chroma_sample_position</a> value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①③">Sequence Header OBU</a>.</p>
-   <p>When not specified in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①④">Sequence Header OBU</a>, and not defined by the conditions specified in the <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44" id="ref-for-page=44">color_config</a>, the values of <a data-link-type="dfn" href="#chroma_subsampling_x" id="ref-for-chroma_subsampling_x">chroma_subsampling_x</a>, <a data-link-type="dfn" href="#chroma_subsampling_y" id="ref-for-chroma_subsampling_y">chroma_subsampling_y</a>, and <a data-link-type="dfn" href="#chroma_sample_position" id="ref-for-chroma_sample_position①">chroma_sample_position</a> SHALL be 0.</p>
-   <p>The <dfn data-dfn-type="dfn" data-export id="initial_presentation_delay_present">initial_presentation_delay_present<a class="self-link" href="#initial_presentation_delay_present"></a></dfn> field indicates the presence of the initial_presentation_delay_minus_one field.</p>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="initial_presentation_delay_minus_one">initial_presentation_delay_minus_one</dfn> field indicates the number of samples (minus one) that need to be decoded prior to starting the presentation of the first sample associated with this sample entry in order to guarantee that each sample will be decoded prior to its presentation time under the constraints of the first level value indicated by <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①①">seq_level_idx</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑤">Sequence Header OBU</a> (in the configOBUs field or in the associated samples). More precisely, the following procedure SHALL not return any error:</p>
-   <ul>
-    <li data-md>
-     <p>construct a hypothetical bitstream consisting of the OBUs carried in the sample entry followed by the OBUs carried in all the samples referring to that sample entry,</p>
-    <li data-md>
-     <p>set the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①②">initial_display_delay_minus_1</a> field of each <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑥">Sequence Header OBU</a> to the number of frames minus one contained in the first <a data-link-type="dfn" href="#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one">initial_presentation_delay_minus_one</a> + 1 samples,</p>
-    <li data-md>
-     <p>set the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①③">frame_presentation_time</a> field of the frame header of each presentable frame such that it matches the presentation time difference between the sample carrying this frame and the previous sample (if it exists, 0 otherwise),</p>
-    <li data-md>
-     <p>apply the decoder model specified in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a> to this hypothetical bitstream using the first operating point. If <code>buffer_removal_time</code> information is present in bitstream for this operating point, the decoding schedule mode SHALL be applied, otherwise the resource availability mode SHALL be applied.</p>
-   </ul>
-   <p class="note" role="note"><span class="marker">NOTE:</span> With the above procedure, when smooth presentation can be guaranteed after decoding the first sample, initial_presentation_delay_minus_one is 0.</p>
-   <p class="note" role="note"><span class="marker">NOTE:</span> Because the above procedure considers all OBUs in all samples associated with a sample entry, if these OBUS form multiple coded video sequences which would have different values of <code>initial_presentation_delay_minus_one</code> if considered separately, the sample entry would signal the larger value.</p>
-   <div class="example" id="example-27bde372">
-    <a class="self-link" href="#example-27bde372"></a> The difference between <a data-link-type="dfn" href="#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one①">initial_presentation_delay_minus_one</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①④">initial_display_delay_minus_1</a> can be illustrated by considering the following example: 
-<pre>a b c d e f g h
-</pre>
-    where letters correspond to frames. Assume that <code><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑤">initial_display_delay_minus_1</a></code> is 2, i.e. that once frame <code>c</code> has been decoded, all other frames in the bitstream can be presented on time. If those frames were grouped into temporal units and samples as follows: 
-<pre>[a] [b c d] [e] [f] [g] [h]
-</pre>
-    <code><a data-link-type="dfn" href="#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one②">initial_presentation_delay_minus_one</a></code> would be 1 because it takes presentation of 2 samples to ensure that <code>c</code> is decoded.
-But if the frames were grouped as follows: 
-<pre>[a] [b] [c] [d e f] [g] [h]
-</pre>
-    <code><a data-link-type="dfn" href="#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one③">initial_presentation_delay_minus_one</a></code> would be 2 because it takes presentation of 3 samples to ensure that <code>c</code> is decoded. 
-   </div>
-   <p>The <dfn data-dfn-type="dfn" data-export id="configobus">configOBUs<a class="self-link" href="#configobus"></a></dfn> field contains zero or more OBUs. Any OBU may be present provided that the following procedures produce compliant AV1 bitstreams:</p>
-   <ul>
-    <li data-md>
-     <p>From any sync sample, an AV1 bitstream is formed by first outputting the OBUs contained in the <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox③">AV1CodecConfigurationBox</a> and then by outputing all OBUs in the samples themselves, in order, starting from the sync sample.</p>
-    <li data-md>
-     <p>From any sample marked with the <a data-link-type="dfn" href="#av1forwardkeyframesamplegroupentry" id="ref-for-av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</a>, an AV1 bitstream is formed by first outputting the OBUs contained in the <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox④">AV1CodecConfigurationBox</a> and then by outputing all OBUs in the sample itself, then by outputting all OBUs in the samples, in order, starting from the sample at the distance indicated by the sample group.</p>
-   </ul>
-   <p>Additionally, the configOBUs field SHALL contain at most one <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑦">Sequence Header OBU</a> and if present, it SHALL be the first OBU.</p>
-   <p class="note" role="note"><span class="marker">NOTE:</span> The configOBUs field is expected to contain only one <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑧">Sequence Header OBU</a> and zero or more <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46">Metadata OBUs</a> when applicable to all the associated samples.</p>
-   <p>OBUs stored in the configOBUs field follow the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑥">open_bitstream_unit</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39①">Low Overhead Bitstream Format</a> syntax as specified in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a>. The flag <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑦">obu_has_size_field</a> SHALL be set to 1, indicating that the size of the OBU payload follows the header, and that it is coded using LEB128.</p>
-   <p>When a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑨">Sequence Header OBU</a> is contained within the configOBUs of the AV1CodecConfigurationRecord, the values present in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⓪">Sequence Header OBU</a> contained within configOBUs SHALL match the values of the AV1CodecConfigurationRecord.</p>
-   <p>The presentation times of AV1 samples are given by the ISOBMFF structures. The <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑧">timing_info_present_flag</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②①">Sequence Header OBU</a> (in the configOBUs field or in the associated samples) SHOULD be set to 0. If set to 1, the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45" id="ref-for-page=45">timing_info</a> structure of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②②">Sequence Header OBU</a>, the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑨">frame_presentation_time</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⓪">buffer_removal_time</a> fields of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49">Frame Header OBUs</a>, if present, SHALL be ignored for the purpose of timed processing of the ISOBMFF file.</p>
-   <p>The sample entry SHOULD contain a <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑤">colr</a> box with a colour_type set to <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑥">nclx</a>. If present, the values of colour_primaries, transfer_characteristics, and matrix_coefficients SHALL match the values given in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②③">Sequence Header OBU</a> (in the configOBUs field or in the associated samples) if the color_description_present_flag is set to 1. Similarly, the full_range_flag in the <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑦">colr</a> box shall match the color_range flag in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②④">Sequence Header OBU</a>. When configOBUs does not contain a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑤">Sequence Header OBU</a>, this box with colour_type set to <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑧">nclx</a> SHALL be present.</p>
-   <p>The CleanApertureBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006⑨">clap</a> SHOULD not be present.</p>
-   <p>For sample entries corresponding to HDR content, the MasteringDisplayColourVolumeBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①⓪">mdcv</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①①">clli</a> SHOULD be present, and their values SHALL match the values of contained in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46①">Metadata OBUs</a> of type METADATA_TYPE_HDR_CLL and METADATA_TYPE_HDR_MDCV, if present (in the configOBUs or in the samples).</p>
-   <p class="note" role="note"><span class="marker">NOTE:</span> The MasteringDisplayColourVolumeBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①②">mdcv</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①③">clli</a> have identical syntax to the SMPTE2086MasteringDisplayMetadataBox <a class="property css" data-link-type="property" href="https://www.webmproject.org/vp9/mp4/#" id="ref-for-37f26709df4ef02bccacdfb3c0626342">SmDm</a> and ContentLightLevelBox <a class="property css" data-link-type="property" href="https://www.webmproject.org/vp9/mp4/#" id="ref-for-37f26709df4ef02bccacdfb3c0626342①">CoLL</a>, except that they are of type <code>Box</code> and not <code>FullBox</code>. However, the semantics of the MasteringDisplayColourVolumeBox and SMPTE2086MasteringDisplayMetadataBox have important differences and should not be confused.</p>
-   <p>Additional boxes may be provided at the end of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①④">VisualSampleEntry</a> as permitted by ISOBMFF, that may represent redundant or similar information to the one provided in some OBUs contained in the <a data-link-type="dfn" href="#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox⑤">AV1CodecConfigurationBox</a>. If the box definition does not indicate that its information overrides the OBU information, in case of conflict, the OBU information should be considered authoritative.</p>
-   <h3 class="heading settled" data-level="2.4" id="sampleformat"><span class="secno">2.4. </span><span class="content">AV1 Sample Format</span><a class="self-link" href="#sampleformat"></a></h3>
-   <p>For tracks using the <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry②">AV1SampleEntry</a>, an <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1-sample">AV1 Sample</dfn> has the following constraints:</p>
-   <ul>
-    <li data-md>
-     <p>the sample data SHALL be a sequence of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39②">OBUs</a> forming a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑤">Temporal Unit</a>,</p>
-    <li data-md>
-     <p>each OBU SHALL follow the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②①">open_bitstream_unit</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39③">Low Overhead Bitstream Format</a> syntax as specified in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a>. Each OBU SHALL have the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②②">obu_has_size_field</a> set to 1 except for the last OBU in the sample, for which <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②③">obu_has_size_field</a> MAY be set to 0, in which case it is assumed to fill the remainder of the sample,</p>
-   </ul>
-   <p class="note" role="note"><span class="marker">NOTE:</span> When extracting OBUs from an ISOBMFF file, and depending on the capabilities of the decoder processing these OBUs, ISOBMFF parsers MAY need to either: set the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②④">obu_has_size_field</a> to 1 for some OBUs if not already set, add the size field in this case, and add <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46②">Temporal Delimiter OBU</a>; or use the length-delimited bitstream format as defined in Annex B of <a data-link-type="dfn" href="#av1s" id="ref-for-av1s">AV1</a>. If encryption is used, similar operations MAY have to be done before or after decryption depending on the demuxer/decryptor/decoder architecture.</p>
-   <ul>
-    <li data-md>
-     <p>OBU trailing bits SHOULD be limited to byte alignment and SHOULD not be used for padding,</p>
-    <li data-md>
-     <p>OBUs of type OBU_TEMPORAL_DELIMITER, OBU_PADDING, or OBU_REDUNDANT_FRAME_HEADER SHOULD NOT be used.</p>
-    <li data-md>
-     <p>OBUs of type OBU_TILE_LIST SHALL NOT be used.</p>
-   </ul>
-   <p>If an AV1 Sample is signaled as a sync sample (in the SyncSampleBox or by setting sample_is_non_sync_sample to 0), it SHALL be a Random Access Point as defined in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a>, i.e. satisfy the following constraints:</p>
-   <ul>
-    <li data-md>
-     <p>Its first frame is a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑥">Key Frame</a> that has <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑤">show_frame</a> flag set to 1,</p>
-    <li data-md>
-     <p>It contains a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑥">Sequence Header OBU</a> before the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49①">Frame Header OBU</a>.</p>
-   </ul>
-   <p class="note" role="note"><span class="marker">NOTE:</span> Within this definition, a sync sample may contain additional frames that are not Key Frames. The fact that none of them is the first frame in the temporal unit ensures that they are decodable.</p>
-   <p class="note" role="note"><span class="marker">NOTE:</span> Other types of OBUs such as <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46③">metadata OBUs</a> could be present before the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑦">Sequence Header OBU</a>.</p>
-   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑦">Intra-only frames</a> SHOULD be signaled using the sample_depends_on flag set to 2.</p>
-   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑦">Delayed Random Access Points</a> SHOULD be signaled using sample groups and the <a data-link-type="dfn" href="#av1forwardkeyframesamplegroupentry" id="ref-for-av1forwardkeyframesamplegroupentry①">AV1ForwardKeyFrameSampleGroupEntry</a>.</p>
-   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑧">Switch Frames</a> SHOULD be signaled using sample groups and the <a data-link-type="dfn" href="#av1switchframesamplegroupentry" id="ref-for-av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</a>.</p>
-   <p>Additionally, if a file contains multiple tracks that are alternative representations of the same content, in particular using <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑨">Switch Frames</a>, those tracks SHOULD be marked as belonging to the same alternate group and should use a track selection box with an appropriate attribute (e.g. <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①⑤">bitr</a>).</p>
-   <p>In tracks using the <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry③">AV1SampleEntry</a>, the <a class="property css" data-link-type="property" href="https://www.iso.org/standard/68960.html#" id="ref-for-952f01526c87045a89015e38d1931006①⑥">ctts</a> box and composition offsets in movie fragments SHALL NOT be used. Similarly, the is_leading flag, if used, SHALL be set to 0 or 2.</p>
-   <p>When a temporal unit contains more than one frame, the sample corresponding to that temporal unit MAY be marked using the <a data-link-type="dfn" href="#av1multiframesamplegroupentry" id="ref-for-av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</a>.</p>
-   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46④">Metadata OBUs</a> may be carried in sample data. In this case, the <a data-link-type="dfn" href="#av1metadatasamplegroupentry" id="ref-for-av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</a> SHOULD be used. If the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑤">metadata OBUs</a> are static for the entire set of samples associated with a given sample description entry, they SHOULD also be in the OBU array in the sample description entry.</p>
-   <p>Unless explicitely stated, the grouping_type_parameter is not defined for the SampleToGroupBox with grouping types defined in this specification.</p>
-   <h3 class="heading settled" data-level="2.5" id="forwardkeyframesamplegroupentry"><span class="secno">2.5. </span><span class="content">AV1 Forward Key Frame sample group entry</span><a class="self-link" href="#forwardkeyframesamplegroupentry"></a></h3>
-   <h4 class="heading settled" data-level="2.5.1" id="forwardkeyframesamplegroupentry-definition"><span class="secno">2.5.1. </span><span class="content">Definition</span><a class="self-link" href="#forwardkeyframesamplegroupentry-definition"></a></h4>
-<pre class="def">Group Type: <dfn data-dfn-type="dfn" data-export id="av1f">av1f<a class="self-link" href="#av1f"></a></dfn>
-Container:  Sample Group Description Box ('sgpd')
-Mandatory:  No
-Quantity:   Zero or more.
-</pre>
-   <h4 class="heading settled" data-level="2.5.2" id="forwardkeyframesamplegroupentry-description"><span class="secno">2.5.2. </span><span class="content">Description</span><a class="self-link" href="#forwardkeyframesamplegroupentry-description"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</dfn> documents samples that contain a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑧">Delayed Random Access Point</a> that are followed at a given distance in the bitstream by a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑨">Key Frame Dependent Recovery Point</a>.</p>
-   <h4 class="heading settled" data-level="2.5.3" id="forwardkeyframesamplegroupentry-syntax"><span class="secno">2.5.3. </span><span class="content">Syntax</span><a class="self-link" href="#forwardkeyframesamplegroupentry-syntax"></a></h4>
-<pre>class AV1ForwardKeyFrameSampleGroupEntry extends VisualSampleGroupEntry('av1f') {
-  unsigned int(8) fwd_distance;
-}
-</pre>
-   <h4 class="heading settled" data-level="2.5.4" id="forwardkeyframesamplegroupentry-semantics"><span class="secno">2.5.4. </span><span class="content">Semantics</span><a class="self-link" href="#forwardkeyframesamplegroupentry-semantics"></a></h4>
-   <p>The <dfn data-dfn-type="dfn" data-export id="fwd_distance">fwd_distance<a class="self-link" href="#fwd_distance"></a></dfn> field indicates the number of samples between this sample and the next sample containing the associated <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206①⓪">Key Frame Dependent Recovery Point</a>. 0 means the next sample.</p>
-   <h3 class="heading settled" data-level="2.6" id="multiframesamplegroupentry"><span class="secno">2.6. </span><span class="content">AV1 Multi-Frame sample group entry</span><a class="self-link" href="#multiframesamplegroupentry"></a></h3>
-   <h4 class="heading settled" data-level="2.6.1" id="multiframesamplegroupentry-definition"><span class="secno">2.6.1. </span><span class="content">Definition</span><a class="self-link" href="#multiframesamplegroupentry-definition"></a></h4>
-<pre class="def">Group Type: <dfn data-dfn-for="AV1MultiFrameSampleGroupEntry" data-dfn-type="value" data-export id="valdef-av1multiframesamplegroupentry-av1m">av1m<a class="self-link" href="#valdef-av1multiframesamplegroupentry-av1m"></a></dfn>
-Container:  Sample Group Description Box ('sgpd')
-Mandatory:  No
-Quantity:   Zero or more.
-</pre>
-   <h4 class="heading settled" data-level="2.6.2" id="multiframesamplegroupentry-description"><span class="secno">2.6.2. </span><span class="content">Description</span><a class="self-link" href="#multiframesamplegroupentry-description"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</dfn> documents samples that contain multiple frames.</p>
-   <h4 class="heading settled" data-level="2.6.3" id="multiframesamplegroupentry-syntax"><span class="secno">2.6.3. </span><span class="content">Syntax</span><a class="self-link" href="#multiframesamplegroupentry-syntax"></a></h4>
-<pre>class AV1MultiFrameSampleGroupEntry extends VisualSampleGroupEntry('av1m') {
-}
-</pre>
-   <h3 class="heading settled" data-level="2.7" id="switchframesamplegroupentry"><span class="secno">2.7. </span><span class="content">AV1 Switch Frame sample group entry</span><a class="self-link" href="#switchframesamplegroupentry"></a></h3>
-   <h4 class="heading settled" data-level="2.7.1" id="switchframesamplegroupentry-definition"><span class="secno">2.7.1. </span><span class="content">Definition</span><a class="self-link" href="#switchframesamplegroupentry-definition"></a></h4>
-<pre class="def">Group Type: <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="av1s">av1s</dfn>
-Container:  Sample Group Description Box ('sgpd')
-Mandatory:  No
-Quantity:   Zero or more.
-</pre>
-   <h4 class="heading settled" data-level="2.7.2" id="switchframesamplegroupentry-description"><span class="secno">2.7.2. </span><span class="content">Description</span><a class="self-link" href="#switchframesamplegroupentry-description"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</dfn> documents samples that start with a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13①⓪">Switch Frame</a>.</p>
-   <h4 class="heading settled" data-level="2.7.3" id="switchframesamplegroupentry-syntax"><span class="secno">2.7.3. </span><span class="content">Syntax</span><a class="self-link" href="#switchframesamplegroupentry-syntax"></a></h4>
-<pre>class AV1SwitchFrameSampleGroupEntry extends VisualSampleGroupEntry('av1s') {
-}
-</pre>
-   <h3 class="heading settled" data-level="2.8" id="metadatasamplegroupentry"><span class="secno">2.8. </span><span class="content">AV1 Metadata sample group entry</span><a class="self-link" href="#metadatasamplegroupentry"></a></h3>
-   <h4 class="heading settled" data-level="2.8.1" id="metadatasamplegroupentry-definition"><span class="secno">2.8.1. </span><span class="content">Definition</span><a class="self-link" href="#metadatasamplegroupentry-definition"></a></h4>
-<pre class="def">Group Type: <dfn data-dfn-for="AV1MetadataSampleGroupEntry" data-dfn-type="value" data-noexport id="valdef-av1metadatasamplegroupentry-av1m">av1M<a class="self-link" href="#valdef-av1metadatasamplegroupentry-av1m"></a></dfn>
-Container:  Sample Group Description Box ('sgpd')
-Mandatory:  No
-Quantity:   Zero or more.
-</pre>
-   <h4 class="heading settled" data-level="2.8.2" id="metadatasamplegroupentry-description"><span class="secno">2.8.2. </span><span class="content">Description</span><a class="self-link" href="#metadatasamplegroupentry-description"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</dfn> documents samples that contain <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑥">metadata OBUs</a>. The <code>grouping_type_parameter</code> can be used to identify samples containing <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑦">metadata OBUs</a> of a given type. If no <code>grouping_type_parameter</code> is provided, the sample group entry identifies samples containing <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑧">metadata OBUs</a> for which the <code>metadata_type</code> is unknown.</p>
-   <h4 class="heading settled" data-level="2.8.3" id="metadatasamplegroupentry-syntax"><span class="secno">2.8.3. </span><span class="content">Syntax</span><a class="self-link" href="#metadatasamplegroupentry-syntax"></a></h4>
-<pre>class AV1MetadataSampleGroupEntry extends VisualSampleGroupEntry('av1M') {
-}
-</pre>
-   <p>For this sample group entry, the <code>grouping_type_parameter</code> syntax is as follows:</p>
-<pre>{
-   unsigned int (8) metadata_type;
-   unsigned int (24) metadata_specific_parameters;
-}
-</pre>
-   <h4 class="heading settled" data-level="2.8.4" id="metadatasamplegroupentry-semantics"><span class="secno">2.8.4. </span><span class="content">Semantics</span><a class="self-link" href="#metadatasamplegroupentry-semantics"></a></h4>
-   <p><dfn data-dfn-type="dfn" data-export id="metadata_type">metadata_type<a class="self-link" href="#metadata_type"></a></dfn> is a 8-bit field whose value is the value of the metadata_type field defined in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a>, when it is equal or lower than 255. metadata_type values above 255 are not supported by this sample group.</p>
-   <p><dfn data-dfn-type="dfn" data-export id="metadata_specific_parameters">metadata_specific_parameters<a class="self-link" href="#metadata_specific_parameters"></a></dfn> provides an additional part of the <code>grouping_type_parameter</code>, which MAY be used to distinguish different sample groups having the same <code>metadata_type</code> but different sub-parameters. In this version of the specification, <code>metadata_specific_parameters</code> is only defined when <code>metadata_type</code> is set to <code>METADATA_TYPE_ITUT_T35</code> in which case its value SHALL be set to the first 24 bits of the <code>metadata_itut_t35</code> structure. For other types of metadata, its value SHOULD be set to 0. In all cases, when the <code>grouping_type_parameter</code> is used, readers processing sample groups SHALL use the entire value of <code>grouping_type_parameter</code>.</p>
-   <h2 class="heading settled" data-level="3" id="cmaf"><span class="secno">3. </span><span class="content">CMAF AV1 track format</span><a class="self-link" href="#cmaf"></a></h2>
-   <p><a data-link-type="biblio" href="#biblio-cmaf" title="Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media">[CMAF]</a> defines structural constraints on ISOBMFF files additional to <a data-link-type="biblio" href="#biblio-isobmff" title="Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format">[ISOBMFF]</a> for the purpose of, for example, adaptive streaming or for protected files. Conformance to these structural constraints is signaled by the presence of the brand <code><a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="ref-for-1568b5183e757fdee5323510bdd1a120">cmfc</a></code> in the <code>FileTypeBox</code>.</p>
-   <p>If a <a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="ref-for-1568b5183e757fdee5323510bdd1a120①">CMAF Video Track</a> uses the brand <code>av01</code>, it is called a <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="cmaf-av1-track">CMAF AV1 Track</dfn> and the following constraints, defining the CMAF Media Profile for AV1, apply:</p>
-   <ul>
-    <li data-md>
-     <p>it SHALL use an <a data-link-type="dfn" href="#av1sampleentry" id="ref-for-av1sampleentry④">AV1SampleEntry</a></p>
-    <li data-md>
-     <p>it MAY use multiple sample entries, and in that case the following values SHALL not change in the track:</p>
-     <ul>
-      <li data-md>
-       <p><code>seq_profile</code></p>
-      <li data-md>
-       <p><code>still_picture</code></p>
-      <li data-md>
-       <p>the first value of <code>seq_level_idx</code></p>
-      <li data-md>
-       <p>the first value of <code>seq_tier</code></p>
-      <li data-md>
-       <p><code>color_config</code></p>
-      <li data-md>
-       <p><code>initial_presentation_delay_minus_one</code></p>
-     </ul>
-   </ul>
-   <p>When protected, <a data-link-type="dfn" href="#cmaf-av1-track" id="ref-for-cmaf-av1-track">CMAF AV1 Tracks</a> SHALL use the signaling defined in <a data-link-type="biblio" href="#biblio-cmaf" title="Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media">[CMAF]</a>, which in turn relies on <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a>, with the provisions specified in <a href="#CommonEncryption">§ 4 Common Encryption</a>.</p>
-   <h2 class="heading settled" data-level="4" id="CommonEncryption"><span class="secno">4. </span><span class="content">Common Encryption</span><a class="self-link" href="#CommonEncryption"></a></h2>
-   <p><a data-link-type="dfn" href="#cmaf-av1-track" id="ref-for-cmaf-av1-track①">CMAF AV1 Tracks</a> and non-segmented AV1 files MAY be protected. If protected, they SHALL conform to <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a>. Files SHOULD be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f">cbcs</a></code> protection scheme and MAY be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①">cenc</a></code> protection scheme.</p>
-   <p>When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f②">cenc</a></code> is used, samples SHALL be protected using subsample encryption and SHALL NOT use pattern encryption.</p>
-   <p>When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f③">cbcs</a></code> is used, samples SHALL be protected using subsample encryption and SHALL use pattern encryption. <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a> recommends that the Block Pattern length be 10, i.e. <code>crypt_byte_block + skip_byte_block = 10</code>, where a Block is of size 16-bytes. In this specification, the combination of <code>crypt_byte_block</code> and <code>skip_byte_block</code> SHALL be one of the following, with the first one being recommended:</p>
-   <ul>
-    <li data-md>
-     <p><code>crypt_byte_block = 1</code> and <code>skip_byte_block = 9</code>,</p>
-    <li data-md>
-     <p><code>crypt_byte_block = 5</code> and <code>skip_byte_block = 5</code>,</p>
-    <li data-md>
-     <p><code>crypt_byte_block = 10</code> and <code>skip_byte_block = 0</code>.</p>
-   </ul>
-   <h3 class="heading settled" data-level="4.1" id="subsample-encryption"><span class="secno">4.1. </span><span class="content">General Subsample Encryption constraints</span><a class="self-link" href="#subsample-encryption"></a></h3>
-   <p>Within protected samples, the following constraints apply:</p>
-   <ul>
-    <li data-md>
-     <p>Protected samples SHALL be exactly spanned by one or more contiguous subsamples.</p>
-     <ul>
-      <li data-md>
-       <p>An OBU MAY be spanned by one or more subsamples, especially when it has multiple ranges of protected data. However, as recommended in <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a>, writers SHOULD reduce the number of subsamples as possible. This can be achieved by using a subsample that spans multiple consecutive unprotected OBUs as well as the first unprotected and protected parts of the following protected OBU, if such protected OBU exists.</p>
-      <li data-md>
-       <p>A large unprotected OBU whose data size is larger than the maximum size of a single <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f④">BytesOfClearData</a> field MAY be spanned by multiple subsamples with zero size <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑤">BytesOfProtectedData</a>.</p>
-     </ul>
-    <li data-md>
-     <p>All <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40" id="ref-for-page=40①">OBU Headers</a> and associated <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑥">obu_size</a> fields SHALL be unprotected.</p>
-    <li data-md>
-     <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑨">Temporal Delimiter OBUs</a>, <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑧">Sequence Header OBUs</a>, and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49②">Frame Header OBUs</a> (including within a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71">Frame OBU</a>), <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121①">Redundant Frame Header OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121②">Padding OBUs</a> SHALL be unprotected.</p>
-    <li data-md>
-     <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46①⓪">Metadata OBUs</a> MAY be protected.</p>
-    <li data-md>
-     <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71①">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71②">Frame OBUs</a> SHALL be protected. Within <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71③">Tile Group OBUs</a> or <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71④">Frame OBUs</a>, the following applies:</p>
-     <ul>
-      <li data-md>
-       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑥">cbcs</a></code>:</p>
-       <ul>
-        <li data-md>
-         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑦">BytesOfProtectedData</a> SHALL start on the first byte and end on the last byte of the <code>decode_tile</code> structure (including any trailing bits).</p>
-       </ul>
-       <p class="note" role="note"><span class="marker">NOTE:</span> As a result of the above, <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑧">BytesOfProtectedData</a> is not necessarily a multiple of 16 bytes and partial blocks are included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f⑨">BytesOfProtectedData</a> range, but per <a data-link-type="biblio" href="#biblio-cenc" title="Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files">[CENC]</a> the data is not be encrypted.</p>
-       <ul>
-        <li data-md>
-         <p>A subsample SHALL be created for each tile, even if its size is less than 16 bytes.</p>
-        <li data-md>
-         <p>All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑤">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑥">Frame OBUs</a> SHALL be unprotected.</p>
-       </ul>
-      <li data-md>
-       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①⓪">cenc</a></code>:</p>
-       <ul>
-        <li data-md>
-         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①①">BytesOfProtectedData</a> SHALL be a multiple of 16 bytes.</p>
-        <li data-md>
-         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①②">BytesOfProtectedData</a> SHALL end on the last byte of the <code>decode_tile</code> structure (including any trailing bits).</p>
-        <li data-md>
-         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①③">BytesOfProtectedData</a> SHALL span all complete 16-byte blocks of the <code>decode_tile</code> structure (including any trailing bits).</p>
-       </ul>
-       <p class="note" role="note"><span class="marker">NOTE:</span> As a result of the above, partial blocks are not used and it is possible that <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①④">BytesOfProtectedData</a> does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.</p>
-       <ul>
-        <li data-md>
-         <p>A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes. If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="ref-for-935be28bb2ef232ad16945b2cdb69c0f①⑤">BytesOfClearData</a> field of a surrounding subsample, if any.</p>
-        <li data-md>
-         <p>All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑦">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑧">Frame OBUs</a> SHALL be unprotected.</p>
-       </ul>
-     </ul>
-   </ul>
-   <h3 class="heading settled" data-level="4.2" id="subsample-encryption-illustration"><span class="secno">4.2. </span><span class="content">Subsample Encryption Illustration</span><a class="self-link" href="#subsample-encryption-illustration"></a></h3>
-    Figure #1 illustrates Subsample based encryption of AV1. 
-   <figure>
-     <img alt="Subsample-based AV1 encryption" src="images/subsample_encryption.svg"> 
-    <figcaption>Subsample-based AV1 encryption.</figcaption>
-   </figure>
-   <h2 class="heading settled" data-level="5" id="codecsparam"><span class="secno">5. </span><span class="content">Codecs Parameter String</span><a class="self-link" href="#codecsparam"></a></h2>
-   <p>DASH and other applications require defined values for the <a class="property css" data-link-type="property" href="https://tools.ietf.org/html/rfc6381#" id="ref-for-df8441526d3bbb5086bd93c1fae005b3">Codecs</a> parameter specified in <a data-link-type="biblio" href="#biblio-rfc6381" title="The &apos;Codecs&apos; and &apos;Profiles&apos; Parameters for &quot;Bucket&quot; Media Types">[RFC6381]</a> for ISO Media tracks. The codecs parameter string for the AOM AV1 codec is as follows:</p>
-<pre>&lt;sample entry 4CC>.&lt;profile>.&lt;level>&lt;tier>.&lt;bitDepth>.&lt;monochrome>.&lt;chromaSubsampling>.
-&lt;colorPrimaries>.&lt;transferCharacteristics>.&lt;matrixCoefficients>.&lt;videoFullRangeFlag>
-</pre>
-   <p>All fields following the sample entry 4CC are expressed as double digit decimals, unless indicated otherwise. Leading or trailing zeros cannot be omitted.</p>
-   <p>The profile parameter value, represented by a single digit decimal, SHALL equal the value of seq_profile in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑨">Sequence Header OBU</a>.</p>
-   <p>The level parameter value SHALL equal the first level value indicated by <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑦">seq_level_idx</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③⓪">Sequence Header OBU</a>.</p>
-   <p>The tier parameter value SHALL be equal to <code>M</code> when the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑧">seq_tier</a> value in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③①">Sequence Header OBU</a> is equal to 0, and <code>H</code> when it is equal to 1.</p>
-   <p>The bitDepth parameter value SHALL equal the value of BitDepth variable as defined in <a data-link-type="biblio" href="#biblio-av1" title="AV1 Bitstream &amp; Decoding Process Specification">[AV1]</a> derived from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③②">Sequence Header OBU</a>.</p>
-   <p>The monochrome parameter value, represented by a single digit decimal, SHALL equal the value of mono_chrome in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③③">Sequence Header OBU</a>.</p>
-   <p>The chromaSubsampling parameter value, represented by a three-digit decimal, SHALL have its first digit equal to subsampling_x and its second digit equal to subsampling_y. If both subsampling_x and subsampling_y are set to 1, then the third digit SHALL be equal to chroma_sample_position, otherwise it SHALL be set to 0.</p>
-   <p>The colorPrimaries, transferCharacteristics, matrixCoefficients, and videoFullRangeFlag parameter values SHALL equal the value of matching fields in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③④">Sequence Header OBU</a>, if color_description_present_flag is set to 1, otherwise they SHOULD not be set, defaulting to the values below. The videoFullRangeFlag is represented by a single digit.</p>
-   <p>For example, codecs="av01.0.04M.10.0.112.09.16.09.0" represents AV1 Main Profile, level 3.0, Main tier, 10-bit content, non-monochrome, with 4:2:0 chroma subsampling co-located with (0, 0) luma sample, ITU-R BT.2100 color primaries, ITU-R BT.2100 PQ transfer characteristics, ITU-R BT.2100 YCbCr color matrix, and studio swing representation.</p>
-   <p>The parameters sample entry 4CC, profile, level, tier, and bitDepth are all mandatory fields. If any of these fields are empty, or not within their allowed range, the processing device SHOULD treat it as an error.</p>
-   <p>All the other fields (including their leading '.') are optional, mutually inclusive (all or none) fields. If not specified then the values listed in the table below are assumed.</p>
-   <table class="def">
-    <tbody>
-     <tr>
-      <td>mono_chrome
-      <td>0
-     <tr>
-      <td>chromaSubsampling
-      <td>110 (4:2:0)
-     <tr>
-      <td>colorPrimaries
-      <td>1 (ITU-R BT.709)
-     <tr>
-      <td>transferCharacteristics
-      <td>1 (ITU-R BT.709)
-     <tr>
-      <td>matrixCoefficients
-      <td>1 (ITU-R BT.709)
-     <tr>
-      <td>videoFullRangeFlag
-      <td>0 (studio swing representation)
-   </table>
-   <p>The string codecs="av01.0.01M.08" in this case would represent AV1 Main Profile, level 2.1, Main tier, 8-bit content with 4:2:0 chroma subsampling, ITU-R BT.709 color primaries, transfer characteristics, matrix coefficients, and studio swing representation.</p>
-   <p>If any character that is not '.', digits, part of the AV1 4CC, or a tier value is encountered, the string SHALL be interpreted ignoring all the characters starting from that character.</p>
-   <h2 class="heading settled" data-level="6" id="changelist"><span class="secno">6. </span><span class="content">Changes since v1.1.0 release</span><a class="self-link" href="#changelist"></a></h2>
-   <ul>
-    <li data-md>
-     <p><a href="https://github.com/AOMediaCodec/av1-isobmff/pull/116"> Change tile/subsample alignement for the <code>cbcs</code> protection scheme.</a></p>
-   </ul>
-  </main>
-  <div data-fill-with="conformance">
-   <h2 class="no-ref no-num heading settled" id="conformance"><span class="content"> Conformance</span><a class="self-link" href="#conformance"></a></h2>
-   <p> Conformance requirements are expressed with a combination of descriptive assertions and RFC 2119 terminology.
-            The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL”
-            in the normative parts of this document
-            are to be interpreted as described in RFC 2119.
-            However, for readability,
-            these words do not appear in all uppercase letters in this specification. </p>
-   <p> All of the text of this specification is normative
-            except sections explicitly marked as non-normative, examples, and notes. <a data-link-type="biblio" href="#biblio-rfc2119" title="Key words for use in RFCs to Indicate Requirement Levels">[RFC2119]</a> </p>
-   <p> Examples in this specification are introduced with the words “for example”
-            or are set apart from the normative text with <code>class="example"</code>, like this: </p>
-   <div class="example" id="example-example"><a class="self-link" href="#example-example"></a> This is an example of an informative example. </div>
-   <p> Informative notes begin with the word “Note”
-            and are set apart from the normative text with <code>class="note"</code>, like this: </p>
-   <p class="note" role="note"> Note, this is an informative note.</p>
-  </div>
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-  <h2 class="no-num no-ref heading settled" id="index"><span class="content">Index</span><a class="self-link" href="#index"></a></h2>
-  <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="content">Terms defined by this specification</span><a class="self-link" href="#index-defined-here"></a></h3>
-  <ul class="index">
-   <li>
-    av01
-    <ul>
-     <li><a href="#valdef-av1sampleentry-av01">value for AV1SampleEntry</a><span>, in § 2.2.1</span>
-     <li><a href="#valdef-isobmff-brand-av01">value for ISOBMFF Brand</a><span>, in § 2.1</span>
-    </ul>
-   <li><a href="#av1c">av1C</a><span>, in § 2.3.1</span>
-   <li><a href="#av1codecconfigurationbox">AV1CodecConfigurationBox</a><span>, in § 2.3.2</span>
-   <li><a href="#av1f">av1f</a><span>, in § 2.5.1</span>
-   <li><a href="#av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</a><span>, in § 2.5.2</span>
-   <li><a href="#valdef-av1metadatasamplegroupentry-av1m">av1M</a><span>, in § 2.8.1</span>
-   <li><a href="#valdef-av1multiframesamplegroupentry-av1m">av1m</a><span>, in § 2.6.1</span>
-   <li><a href="#av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</a><span>, in § 2.8.2</span>
-   <li><a href="#av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</a><span>, in § 2.6.2</span>
-   <li><a href="#av1s">av1s</a><span>, in § 2.7.1</span>
-   <li><a href="#av1-sample">AV1 Sample</a><span>, in § 2.4</span>
-   <li><a href="#av1sampleentry">AV1SampleEntry</a><span>, in § 2.2.2</span>
-   <li><a href="#av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</a><span>, in § 2.7.2</span>
-   <li><a href="#chroma_sample_position">chroma_sample_position</a><span>, in § 2.3.4</span>
-   <li><a href="#chroma_subsampling_x">chroma_subsampling_x</a><span>, in § 2.3.4</span>
-   <li><a href="#chroma_subsampling_y">chroma_subsampling_y</a><span>, in § 2.3.4</span>
-   <li><a href="#cmaf-av1-track">CMAF AV1 Track</a><span>, in § 3</span>
-   <li><a href="#compressorname">compressorname</a><span>, in § 2.2.4</span>
-   <li><a href="#config">config</a><span>, in § 2.2.4</span>
-   <li><a href="#configobus">configOBUs</a><span>, in § 2.3.4</span>
-   <li><a href="#fwd_distance">fwd_distance</a><span>, in § 2.5.4</span>
-   <li><a href="#height">height</a><span>, in § 2.2.4</span>
-   <li><a href="#high_bitdepth">high_bitdepth</a><span>, in § 2.3.4</span>
-   <li><a href="#initial_presentation_delay_minus_one">initial_presentation_delay_minus_one</a><span>, in § 2.3.4</span>
-   <li><a href="#initial_presentation_delay_present">initial_presentation_delay_present</a><span>, in § 2.3.4</span>
-   <li><a href="#marker">marker</a><span>, in § 2.3.4</span>
-   <li><a href="#metadata_specific_parameters">metadata_specific_parameters</a><span>, in § 2.8.4</span>
-   <li><a href="#metadata_type">metadata_type</a><span>, in § 2.8.4</span>
-   <li><a href="#monochrome">monochrome</a><span>, in § 2.3.4</span>
-   <li><a href="#seq_level_idx_0">seq_level_idx_0</a><span>, in § 2.3.4</span>
-   <li><a href="#seq_profile">seq_profile</a><span>, in § 2.3.4</span>
-   <li><a href="#seq_tier_0">seq_tier_0</a><span>, in § 2.3.4</span>
-   <li><a href="#twelve_bit">twelve_bit</a><span>, in § 2.3.4</span>
-   <li><a href="#version">version</a><span>, in § 2.3.4</span>
-   <li><a href="#width">width</a><span>, in § 2.2.4</span>
-  </ul>
-  <aside aria-labelledby="infopaneltitle-for-f03adbccd0f71dbd64db6303812028fa" class="dfn-panel" data-for="f03adbccd0f71dbd64db6303812028fa" id="infopanel-for-f03adbccd0f71dbd64db6303812028fa">
-   <span id="infopaneltitle-for-f03adbccd0f71dbd64db6303812028fa" style="display:none">Info about the 'av1 bitstream' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=1">1. Bitstream features overview</a>
-    <li><a href="#ref-for-page=1①">2. Basic Encapsulation Scheme</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-3832a1720800015cee7b0703f7328c35" class="dfn-panel" data-for="3832a1720800015cee7b0703f7328c35" id="infopanel-for-3832a1720800015cee7b0703f7328c35">
-   <span id="infopaneltitle-for-3832a1720800015cee7b0703f7328c35" style="display:none">Info about the 'buffer_removal_time' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-559078660a67169a7db62632f96f0f56" class="dfn-panel" data-for="559078660a67169a7db62632f96f0f56" id="infopanel-for-559078660a67169a7db62632f96f0f56">
-   <span id="infopaneltitle-for-559078660a67169a7db62632f96f0f56" style="display:none">Info about the 'color_config' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=44">2.3.4. Semantics</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-ffd6a013c385ccb5c6974a36f39c9419" class="dfn-panel" data-for="ffd6a013c385ccb5c6974a36f39c9419" id="infopanel-for-ffd6a013c385ccb5c6974a36f39c9419">
-   <span id="infopaneltitle-for-ffd6a013c385ccb5c6974a36f39c9419" style="display:none">Info about the 'delayed random access point' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=206">1. Bitstream features overview</a> <a href="#ref-for-page=206①">(2)</a> <a href="#ref-for-page=206②">(3)</a> <a href="#ref-for-page=206③">(4)</a> <a href="#ref-for-page=206④">(5)</a> <a href="#ref-for-page=206⑤">(6)</a> <a href="#ref-for-page=206⑥">(7)</a>
-    <li><a href="#ref-for-page=206⑦">2.4. AV1 Sample Format</a>
-    <li><a href="#ref-for-page=206⑧">2.5.2. Description</a> <a href="#ref-for-page=206⑨">(2)</a>
-    <li><a href="#ref-for-page=206①⓪">2.5.4. Semantics</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-d58adec65fc7472c4103fc0ce48ffad2" class="dfn-panel" data-for="d58adec65fc7472c4103fc0ce48ffad2" id="infopanel-for-d58adec65fc7472c4103fc0ce48ffad2">
-   <span id="infopaneltitle-for-d58adec65fc7472c4103fc0ce48ffad2" style="display:none">Info about the 'frame header obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=49">2.3.4. Semantics</a>
-    <li><a href="#ref-for-page=49①">2.4. AV1 Sample Format</a>
-    <li><a href="#ref-for-page=49②">4.1. General Subsample Encryption constraints</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-61cc567b8d2c37a5482c59baafb6b8ff" class="dfn-panel" data-for="61cc567b8d2c37a5482c59baafb6b8ff" id="infopanel-for-61cc567b8d2c37a5482c59baafb6b8ff">
-   <span id="infopaneltitle-for-61cc567b8d2c37a5482c59baafb6b8ff" style="display:none">Info about the 'frame obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=71">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=71①">(2)</a> <a href="#ref-for-page=71②">(3)</a> <a href="#ref-for-page=71③">(4)</a> <a href="#ref-for-page=71④">(5)</a> <a href="#ref-for-page=71⑤">(6)</a> <a href="#ref-for-page=71⑥">(7)</a> <a href="#ref-for-page=71⑦">(8)</a> <a href="#ref-for-page=71⑧">(9)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-44bda72a7faed4e3816a653629cc8043" class="dfn-panel" data-for="44bda72a7faed4e3816a653629cc8043" id="infopanel-for-44bda72a7faed4e3816a653629cc8043">
-   <span id="infopaneltitle-for-44bda72a7faed4e3816a653629cc8043" style="display:none">Info about the 'frame_presentation_time' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-8720e7b90737c186d54125451a6578c3" class="dfn-panel" data-for="8720e7b90737c186d54125451a6578c3" id="infopanel-for-8720e7b90737c186d54125451a6578c3">
-   <span id="infopaneltitle-for-8720e7b90737c186d54125451a6578c3" style="display:none">Info about the 'initial_display_delay_minus_1' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-320f0b8648b2c86937bd5df124c0721c" class="dfn-panel" data-for="320f0b8648b2c86937bd5df124c0721c" id="infopanel-for-320f0b8648b2c86937bd5df124c0721c">
-   <span id="infopaneltitle-for-320f0b8648b2c86937bd5df124c0721c" style="display:none">Info about the 'inter frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
-    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
-    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-48602d12010b460d62666543107dbb8c" class="dfn-panel" data-for="48602d12010b460d62666543107dbb8c" id="infopanel-for-48602d12010b460d62666543107dbb8c">
-   <span id="infopaneltitle-for-48602d12010b460d62666543107dbb8c" style="display:none">Info about the 'intra-only frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
-    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
-    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-f8cc04bc4613acfd789110ae277063a3" class="dfn-panel" data-for="f8cc04bc4613acfd789110ae277063a3" id="infopanel-for-f8cc04bc4613acfd789110ae277063a3">
-   <span id="infopaneltitle-for-f8cc04bc4613acfd789110ae277063a3" style="display:none">Info about the 'key frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
-    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
-    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-295ffdcbb0b3062ed4b9d6391d6555f8" class="dfn-panel" data-for="295ffdcbb0b3062ed4b9d6391d6555f8" id="infopanel-for-295ffdcbb0b3062ed4b9d6391d6555f8">
-   <span id="infopaneltitle-for-295ffdcbb0b3062ed4b9d6391d6555f8" style="display:none">Info about the 'key frame dependent recovery point' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=206">1. Bitstream features overview</a> <a href="#ref-for-page=206①">(2)</a> <a href="#ref-for-page=206②">(3)</a> <a href="#ref-for-page=206③">(4)</a> <a href="#ref-for-page=206④">(5)</a> <a href="#ref-for-page=206⑤">(6)</a> <a href="#ref-for-page=206⑥">(7)</a>
-    <li><a href="#ref-for-page=206⑦">2.4. AV1 Sample Format</a>
-    <li><a href="#ref-for-page=206⑧">2.5.2. Description</a> <a href="#ref-for-page=206⑨">(2)</a>
-    <li><a href="#ref-for-page=206①⓪">2.5.4. Semantics</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-effc5260e6921d7355a31efe9e581f5e" class="dfn-panel" data-for="effc5260e6921d7355a31efe9e581f5e" id="infopanel-for-effc5260e6921d7355a31efe9e581f5e">
-   <span id="infopaneltitle-for-effc5260e6921d7355a31efe9e581f5e" style="display:none">Info about the 'low overhead bitstream format' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=39">1. Bitstream features overview</a>
-    <li><a href="#ref-for-page=39①">2.3.4. Semantics</a>
-    <li><a href="#ref-for-page=39②">2.4. AV1 Sample Format</a> <a href="#ref-for-page=39③">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-2f273a655f76900606361284b223527c" class="dfn-panel" data-for="2f273a655f76900606361284b223527c" id="infopanel-for-2f273a655f76900606361284b223527c">
-   <span id="infopaneltitle-for-2f273a655f76900606361284b223527c" style="display:none">Info about the 'max_frame_height_minus_1' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-607e04e0caddfe3e61efb6ea8770130c" class="dfn-panel" data-for="607e04e0caddfe3e61efb6ea8770130c" id="infopanel-for-607e04e0caddfe3e61efb6ea8770130c">
-   <span id="infopaneltitle-for-607e04e0caddfe3e61efb6ea8770130c" style="display:none">Info about the 'max_frame_width_minus_1' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-cd1fdf90baa77d8296625f83349a558c" class="dfn-panel" data-for="cd1fdf90baa77d8296625f83349a558c" id="infopanel-for-cd1fdf90baa77d8296625f83349a558c">
-   <span id="infopaneltitle-for-cd1fdf90baa77d8296625f83349a558c" style="display:none">Info about the 'metadata obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=46">2.3.4. Semantics</a> <a href="#ref-for-page=46①">(2)</a>
-    <li><a href="#ref-for-page=46②">2.4. AV1 Sample Format</a> <a href="#ref-for-page=46③">(2)</a> <a href="#ref-for-page=46④">(3)</a> <a href="#ref-for-page=46⑤">(4)</a>
-    <li><a href="#ref-for-page=46⑥">2.8.2. Description</a> <a href="#ref-for-page=46⑦">(2)</a> <a href="#ref-for-page=46⑧">(3)</a>
-    <li><a href="#ref-for-page=46⑨">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=46①⓪">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-eb0782dfea22c80ac75d63b45a421c45" class="dfn-panel" data-for="eb0782dfea22c80ac75d63b45a421c45" id="infopanel-for-eb0782dfea22c80ac75d63b45a421c45">
-   <span id="infopaneltitle-for-eb0782dfea22c80ac75d63b45a421c45" style="display:none">Info about the 'mono_chrome' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-fad0316db590b5b97f2a78eea1a20567" class="dfn-panel" data-for="fad0316db590b5b97f2a78eea1a20567" id="infopanel-for-fad0316db590b5b97f2a78eea1a20567">
-   <span id="infopaneltitle-for-fad0316db590b5b97f2a78eea1a20567" style="display:none">Info about the 'obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=39">1. Bitstream features overview</a>
-    <li><a href="#ref-for-page=39①">2.3.4. Semantics</a>
-    <li><a href="#ref-for-page=39②">2.4. AV1 Sample Format</a> <a href="#ref-for-page=39③">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-bcf179fe5dc66841b8ee6f4bf7024547" class="dfn-panel" data-for="bcf179fe5dc66841b8ee6f4bf7024547" id="infopanel-for-bcf179fe5dc66841b8ee6f4bf7024547">
-   <span id="infopaneltitle-for-bcf179fe5dc66841b8ee6f4bf7024547" style="display:none">Info about the 'obu header' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=40">2.3.4. Semantics</a>
-    <li><a href="#ref-for-page=40①">4.1. General Subsample Encryption constraints</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-f9c9cd91bc5ff3e8007f3109e4172022" class="dfn-panel" data-for="f9c9cd91bc5ff3e8007f3109e4172022" id="infopanel-for-f9c9cd91bc5ff3e8007f3109e4172022">
-   <span id="infopaneltitle-for-f9c9cd91bc5ff3e8007f3109e4172022" style="display:none">Info about the 'obu_has_size_field' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-ae8c5a5a2224e16c570d1c72ed7f9ca3" class="dfn-panel" data-for="ae8c5a5a2224e16c570d1c72ed7f9ca3" id="infopanel-for-ae8c5a5a2224e16c570d1c72ed7f9ca3">
-   <span id="infopaneltitle-for-ae8c5a5a2224e16c570d1c72ed7f9ca3" style="display:none">Info about the 'obu_size' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-f41c7b6b409e9137c8b46b0e8192eae7" class="dfn-panel" data-for="f41c7b6b409e9137c8b46b0e8192eae7" id="infopanel-for-f41c7b6b409e9137c8b46b0e8192eae7">
-   <span id="infopaneltitle-for-f41c7b6b409e9137c8b46b0e8192eae7" style="display:none">Info about the 'open_bitstream_unit' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-cb42042994dfc555541c6d2a5b7ac21c" class="dfn-panel" data-for="cb42042994dfc555541c6d2a5b7ac21c" id="infopanel-for-cb42042994dfc555541c6d2a5b7ac21c">
-   <span id="infopaneltitle-for-cb42042994dfc555541c6d2a5b7ac21c" style="display:none">Info about the 'padding obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=121">1. Bitstream features overview</a>
-    <li><a href="#ref-for-page=121①">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=121②">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-2a14dd3c3618065abd5e1df01cd526ce" class="dfn-panel" data-for="2a14dd3c3618065abd5e1df01cd526ce" id="infopanel-for-2a14dd3c3618065abd5e1df01cd526ce">
-   <span id="infopaneltitle-for-2a14dd3c3618065abd5e1df01cd526ce" style="display:none">Info about the 'random access point' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=206">1. Bitstream features overview</a> <a href="#ref-for-page=206①">(2)</a> <a href="#ref-for-page=206②">(3)</a> <a href="#ref-for-page=206③">(4)</a> <a href="#ref-for-page=206④">(5)</a> <a href="#ref-for-page=206⑤">(6)</a> <a href="#ref-for-page=206⑥">(7)</a>
-    <li><a href="#ref-for-page=206⑦">2.4. AV1 Sample Format</a>
-    <li><a href="#ref-for-page=206⑧">2.5.2. Description</a> <a href="#ref-for-page=206⑨">(2)</a>
-    <li><a href="#ref-for-page=206①⓪">2.5.4. Semantics</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-49d4b1324b3e6175214f1de9258652c0" class="dfn-panel" data-for="49d4b1324b3e6175214f1de9258652c0" id="infopanel-for-49d4b1324b3e6175214f1de9258652c0">
-   <span id="infopaneltitle-for-49d4b1324b3e6175214f1de9258652c0" style="display:none">Info about the 'redundant frame header obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=121">1. Bitstream features overview</a>
-    <li><a href="#ref-for-page=121①">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=121②">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-6af483fb580bc8cd300825f157ed0f23" class="dfn-panel" data-for="6af483fb580bc8cd300825f157ed0f23" id="infopanel-for-6af483fb580bc8cd300825f157ed0f23">
-   <span id="infopaneltitle-for-6af483fb580bc8cd300825f157ed0f23" style="display:none">Info about the 'seq_level_idx' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-8c994b92162ebe7ad58fd07f5c951f12" class="dfn-panel" data-for="8c994b92162ebe7ad58fd07f5c951f12" id="infopanel-for-8c994b92162ebe7ad58fd07f5c951f12">
-   <span id="infopaneltitle-for-8c994b92162ebe7ad58fd07f5c951f12" style="display:none">Info about the 'seq_tier' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-0eb96964e5fc585c9760f0cc0f7aa6c3" class="dfn-panel" data-for="0eb96964e5fc585c9760f0cc0f7aa6c3" id="infopanel-for-0eb96964e5fc585c9760f0cc0f7aa6c3">
-   <span id="infopaneltitle-for-0eb96964e5fc585c9760f0cc0f7aa6c3" style="display:none">Info about the 'sequence header obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=41">2.2.4. Semantics</a> <a href="#ref-for-page=41①">(2)</a>
-    <li><a href="#ref-for-page=41②">2.3.4. Semantics</a> <a href="#ref-for-page=41③">(2)</a> <a href="#ref-for-page=41④">(3)</a> <a href="#ref-for-page=41⑤">(4)</a> <a href="#ref-for-page=41⑥">(5)</a> <a href="#ref-for-page=41⑦">(6)</a> <a href="#ref-for-page=41⑧">(7)</a> <a href="#ref-for-page=41⑨">(8)</a> <a href="#ref-for-page=41①⓪">(9)</a> <a href="#ref-for-page=41①①">(10)</a> <a href="#ref-for-page=41①②">(11)</a> <a href="#ref-for-page=41①③">(12)</a> <a href="#ref-for-page=41①④">(13)</a> <a href="#ref-for-page=41①⑤">(14)</a> <a href="#ref-for-page=41①⑥">(15)</a> <a href="#ref-for-page=41①⑦">(16)</a> <a href="#ref-for-page=41①⑧">(17)</a> <a href="#ref-for-page=41①⑨">(18)</a> <a href="#ref-for-page=41②⓪">(19)</a> <a href="#ref-for-page=41②①">(20)</a> <a href="#ref-for-page=41②②">(21)</a> <a href="#ref-for-page=41②③">(22)</a> <a href="#ref-for-page=41②④">(23)</a> <a href="#ref-for-page=41②⑤">(24)</a>
-    <li><a href="#ref-for-page=41②⑥">2.4. AV1 Sample Format</a> <a href="#ref-for-page=41②⑦">(2)</a>
-    <li><a href="#ref-for-page=41②⑧">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=41②⑨">5. Codecs Parameter String</a> <a href="#ref-for-page=41③⓪">(2)</a> <a href="#ref-for-page=41③①">(3)</a> <a href="#ref-for-page=41③②">(4)</a> <a href="#ref-for-page=41③③">(5)</a> <a href="#ref-for-page=41③④">(6)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-8ee84de303b43ec62bb21bf9598287a4" class="dfn-panel" data-for="8ee84de303b43ec62bb21bf9598287a4" id="infopanel-for-8ee84de303b43ec62bb21bf9598287a4">
-   <span id="infopaneltitle-for-8ee84de303b43ec62bb21bf9598287a4" style="display:none">Info about the 'show_existing_frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-6ab350adb6a8d151ef893c148883c990" class="dfn-panel" data-for="6ab350adb6a8d151ef893c148883c990" id="infopanel-for-6ab350adb6a8d151ef893c148883c990">
-   <span id="infopaneltitle-for-6ab350adb6a8d151ef893c148883c990" style="display:none">Info about the 'show_frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-006a3bf07dac848d227cff3f097563c8" class="dfn-panel" data-for="006a3bf07dac848d227cff3f097563c8" id="infopanel-for-006a3bf07dac848d227cff3f097563c8">
-   <span id="infopaneltitle-for-006a3bf07dac848d227cff3f097563c8" style="display:none">Info about the 'subsampling_x' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-eb7fc80c7183639b2fdb78f61ce55a11" class="dfn-panel" data-for="eb7fc80c7183639b2fdb78f61ce55a11" id="infopanel-for-eb7fc80c7183639b2fdb78f61ce55a11">
-   <span id="infopaneltitle-for-eb7fc80c7183639b2fdb78f61ce55a11" style="display:none">Info about the 'subsampling_y' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-8a2bfdfe0bd189daf691bcd702fe8795" class="dfn-panel" data-for="8a2bfdfe0bd189daf691bcd702fe8795" id="infopanel-for-8a2bfdfe0bd189daf691bcd702fe8795">
-   <span id="infopaneltitle-for-8a2bfdfe0bd189daf691bcd702fe8795" style="display:none">Info about the 'switch frame' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
-    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
-    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-e07ec093ac0a6bd7e497becb0e4dedc1" class="dfn-panel" data-for="e07ec093ac0a6bd7e497becb0e4dedc1" id="infopanel-for-e07ec093ac0a6bd7e497becb0e4dedc1">
-   <span id="infopaneltitle-for-e07ec093ac0a6bd7e497becb0e4dedc1" style="display:none">Info about the 'temporal delimiter obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=46">2.3.4. Semantics</a> <a href="#ref-for-page=46①">(2)</a>
-    <li><a href="#ref-for-page=46②">2.4. AV1 Sample Format</a> <a href="#ref-for-page=46③">(2)</a> <a href="#ref-for-page=46④">(3)</a> <a href="#ref-for-page=46⑤">(4)</a>
-    <li><a href="#ref-for-page=46⑥">2.8.2. Description</a> <a href="#ref-for-page=46⑦">(2)</a> <a href="#ref-for-page=46⑧">(3)</a>
-    <li><a href="#ref-for-page=46⑨">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=46①⓪">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-d71db54f0eeaab45d4615cfd2ca2de3d" class="dfn-panel" data-for="d71db54f0eeaab45d4615cfd2ca2de3d" id="infopanel-for-d71db54f0eeaab45d4615cfd2ca2de3d">
-   <span id="infopaneltitle-for-d71db54f0eeaab45d4615cfd2ca2de3d" style="display:none">Info about the 'temporal unit' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=13">1. Bitstream features overview</a> <a href="#ref-for-page=13①">(2)</a> <a href="#ref-for-page=13②">(3)</a> <a href="#ref-for-page=13③">(4)</a> <a href="#ref-for-page=13④">(5)</a>
-    <li><a href="#ref-for-page=13⑤">2.4. AV1 Sample Format</a> <a href="#ref-for-page=13⑥">(2)</a> <a href="#ref-for-page=13⑦">(3)</a> <a href="#ref-for-page=13⑧">(4)</a> <a href="#ref-for-page=13⑨">(5)</a>
-    <li><a href="#ref-for-page=13①⓪">2.7.2. Description</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-d85adcf672535355b6f59f8ae2a7f312" class="dfn-panel" data-for="d85adcf672535355b6f59f8ae2a7f312" id="infopanel-for-d85adcf672535355b6f59f8ae2a7f312">
-   <span id="infopaneltitle-for-d85adcf672535355b6f59f8ae2a7f312" style="display:none">Info about the 'tile group obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=71">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=71①">(2)</a> <a href="#ref-for-page=71②">(3)</a> <a href="#ref-for-page=71③">(4)</a> <a href="#ref-for-page=71④">(5)</a> <a href="#ref-for-page=71⑤">(6)</a> <a href="#ref-for-page=71⑥">(7)</a> <a href="#ref-for-page=71⑦">(8)</a> <a href="#ref-for-page=71⑧">(9)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-f22120bb18bc0c18d65d82eeeca12326" class="dfn-panel" data-for="f22120bb18bc0c18d65d82eeeca12326" id="infopanel-for-f22120bb18bc0c18d65d82eeeca12326">
-   <span id="infopaneltitle-for-f22120bb18bc0c18d65d82eeeca12326" style="display:none">Info about the 'tile list obu' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=121">1. Bitstream features overview</a>
-    <li><a href="#ref-for-page=121①">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-page=121②">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-0bf077100eb0b617c5b8accac3f316c4" class="dfn-panel" data-for="0bf077100eb0b617c5b8accac3f316c4" id="infopanel-for-0bf077100eb0b617c5b8accac3f316c4">
-   <span id="infopaneltitle-for-0bf077100eb0b617c5b8accac3f316c4" style="display:none">Info about the 'timing_info' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=45">2.3.4. Semantics</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-b23305d39492fb7d58d912b81e05ff07" class="dfn-panel" data-for="b23305d39492fb7d58d912b81e05ff07" id="infopanel-for-b23305d39492fb7d58d912b81e05ff07">
-   <span id="infopaneltitle-for-b23305d39492fb7d58d912b81e05ff07" style="display:none">Info about the 'timing_info_present_flag' external reference.</span><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-page=2">1. Bitstream features overview</a> <a href="#ref-for-page=2①">(2)</a> <a href="#ref-for-page=2②">(3)</a> <a href="#ref-for-page=2③">(4)</a>
-    <li><a href="#ref-for-page=2④">2.2.4. Semantics</a> <a href="#ref-for-page=2⑤">(2)</a> <a href="#ref-for-page=2⑥">(3)</a> <a href="#ref-for-page=2⑦">(4)</a>
-    <li><a href="#ref-for-page=2⑧">2.3.4. Semantics</a> <a href="#ref-for-page=2⑨">(2)</a> <a href="#ref-for-page=2①⓪">(3)</a> <a href="#ref-for-page=2①①">(4)</a> <a href="#ref-for-page=2①②">(5)</a> <a href="#ref-for-page=2①③">(6)</a> <a href="#ref-for-page=2①④">(7)</a> <a href="#ref-for-page=2①⑤">(8)</a> <a href="#ref-for-page=2①⑥">(9)</a> <a href="#ref-for-page=2①⑦">(10)</a> <a href="#ref-for-page=2①⑧">(11)</a> <a href="#ref-for-page=2①⑨">(12)</a> <a href="#ref-for-page=2②⓪">(13)</a>
-    <li><a href="#ref-for-page=2②①">2.4. AV1 Sample Format</a> <a href="#ref-for-page=2②②">(2)</a> <a href="#ref-for-page=2②③">(3)</a> <a href="#ref-for-page=2②④">(4)</a> <a href="#ref-for-page=2②⑤">(5)</a>
-    <li><a href="#ref-for-page=2②⑥">4.1. General Subsample Encryption constraints</a>
-    <li><a href="#ref-for-page=2②⑦">5. Codecs Parameter String</a> <a href="#ref-for-page=2②⑧">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-935be28bb2ef232ad16945b2cdb69c0f" class="dfn-panel" data-for="935be28bb2ef232ad16945b2cdb69c0f" id="infopanel-for-935be28bb2ef232ad16945b2cdb69c0f">
-   <span id="infopaneltitle-for-935be28bb2ef232ad16945b2cdb69c0f" style="display:none">Info about the 'bytesofcleardata' external reference.</span><a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4. Common Encryption</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a>
-    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(5)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(6)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(7)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(8)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(9)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(10)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(11)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(12)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-0823905e938db14fa0ce9f54969cea70" class="dfn-panel" data-for="0823905e938db14fa0ce9f54969cea70" id="infopanel-for-0823905e938db14fa0ce9f54969cea70">
-   <span id="infopaneltitle-for-0823905e938db14fa0ce9f54969cea70" style="display:none">Info about the 'bytesofprotecteddata' external reference.</span><a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4. Common Encryption</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a>
-    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(5)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(6)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(7)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(8)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(9)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(10)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(11)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(12)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-2b285af7abdae2d4aab3a7cbedfdd6ab" class="dfn-panel" data-for="2b285af7abdae2d4aab3a7cbedfdd6ab" id="infopanel-for-2b285af7abdae2d4aab3a7cbedfdd6ab">
-   <span id="infopaneltitle-for-2b285af7abdae2d4aab3a7cbedfdd6ab" style="display:none">Info about the 'cbcs' external reference.</span><a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4. Common Encryption</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a>
-    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(5)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(6)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(7)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(8)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(9)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(10)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(11)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(12)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-742c038dd8361327983a92bd81e21859" class="dfn-panel" data-for="742c038dd8361327983a92bd81e21859" id="infopanel-for-742c038dd8361327983a92bd81e21859">
-   <span id="infopaneltitle-for-742c038dd8361327983a92bd81e21859" style="display:none">Info about the 'cenc' external reference.</span><a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4. Common Encryption</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a>
-    <li><a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">4.1. General Subsample Encryption constraints</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(2)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(3)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(4)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(5)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(6)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(7)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(8)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(9)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(10)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(11)</a> <a href="#ref-for-935be28bb2ef232ad16945b2cdb69c0f">(12)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-1568b5183e757fdee5323510bdd1a120" class="dfn-panel" data-for="1568b5183e757fdee5323510bdd1a120" id="infopanel-for-1568b5183e757fdee5323510bdd1a120">
-   <span id="infopaneltitle-for-1568b5183e757fdee5323510bdd1a120" style="display:none">Info about the 'cmaf video track' external reference.</span><a href="https://www.iso.org/standard/71975.html#">https://www.iso.org/standard/71975.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-1568b5183e757fdee5323510bdd1a120">3. CMAF AV1 track format</a> <a href="#ref-for-1568b5183e757fdee5323510bdd1a120">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-76fc7918b57ae33e76892402603c6b72" class="dfn-panel" data-for="76fc7918b57ae33e76892402603c6b72" id="infopanel-for-76fc7918b57ae33e76892402603c6b72">
-   <span id="infopaneltitle-for-76fc7918b57ae33e76892402603c6b72" style="display:none">Info about the 'cmfc' external reference.</span><a href="https://www.iso.org/standard/71975.html#">https://www.iso.org/standard/71975.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-1568b5183e757fdee5323510bdd1a120">3. CMAF AV1 track format</a> <a href="#ref-for-1568b5183e757fdee5323510bdd1a120">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-952f01526c87045a89015e38d1931006" class="dfn-panel" data-for="952f01526c87045a89015e38d1931006" id="infopanel-for-952f01526c87045a89015e38d1931006">
-   <span id="infopaneltitle-for-952f01526c87045a89015e38d1931006" style="display:none">Info about the 'bitr' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-52b8fcc7cef8754159148e684a77d02e" class="dfn-panel" data-for="52b8fcc7cef8754159148e684a77d02e" id="infopanel-for-52b8fcc7cef8754159148e684a77d02e">
-   <span id="infopaneltitle-for-52b8fcc7cef8754159148e684a77d02e" style="display:none">Info about the 'clap' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-15388b1662efccc6c0d26daa21eb8a02" class="dfn-panel" data-for="15388b1662efccc6c0d26daa21eb8a02" id="infopanel-for-15388b1662efccc6c0d26daa21eb8a02">
-   <span id="infopaneltitle-for-15388b1662efccc6c0d26daa21eb8a02" style="display:none">Info about the 'clli' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-6351cd1cc3bfb6561867f56587297705" class="dfn-panel" data-for="6351cd1cc3bfb6561867f56587297705" id="infopanel-for-6351cd1cc3bfb6561867f56587297705">
-   <span id="infopaneltitle-for-6351cd1cc3bfb6561867f56587297705" style="display:none">Info about the 'colr' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-1b1b183a7f9c84aa05248368ea7421ba" class="dfn-panel" data-for="1b1b183a7f9c84aa05248368ea7421ba" id="infopanel-for-1b1b183a7f9c84aa05248368ea7421ba">
-   <span id="infopaneltitle-for-1b1b183a7f9c84aa05248368ea7421ba" style="display:none">Info about the 'ctts' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-295c612b69b22d9306c1004b4766efa2" class="dfn-panel" data-for="295c612b69b22d9306c1004b4766efa2" id="infopanel-for-295c612b69b22d9306c1004b4766efa2">
-   <span id="infopaneltitle-for-295c612b69b22d9306c1004b4766efa2" style="display:none">Info about the 'iso6' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-fcf81bf686786e641e169d84d6f6c84a" class="dfn-panel" data-for="fcf81bf686786e641e169d84d6f6c84a" id="infopanel-for-fcf81bf686786e641e169d84d6f6c84a">
-   <span id="infopaneltitle-for-fcf81bf686786e641e169d84d6f6c84a" style="display:none">Info about the 'mdcv' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-f2de67e75e1151de694a7aedeccb7e6c" class="dfn-panel" data-for="f2de67e75e1151de694a7aedeccb7e6c" id="infopanel-for-f2de67e75e1151de694a7aedeccb7e6c">
-   <span id="infopaneltitle-for-f2de67e75e1151de694a7aedeccb7e6c" style="display:none">Info about the 'nclx' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-d72ed60b4c680fa6477d565e9553dd28" class="dfn-panel" data-for="d72ed60b4c680fa6477d565e9553dd28" id="infopanel-for-d72ed60b4c680fa6477d565e9553dd28">
-   <span id="infopaneltitle-for-d72ed60b4c680fa6477d565e9553dd28" style="display:none">Info about the 'visualsampleentry' external reference.</span><a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.1. General Requirements &amp; Brands</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.2.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.3.4. Semantics</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(3)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(4)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(5)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(6)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(7)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(8)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(9)</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(10)</a>
-    <li><a href="#ref-for-952f01526c87045a89015e38d1931006">2.4. AV1 Sample Format</a> <a href="#ref-for-952f01526c87045a89015e38d1931006">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-df8441526d3bbb5086bd93c1fae005b3" class="dfn-panel" data-for="df8441526d3bbb5086bd93c1fae005b3" id="infopanel-for-df8441526d3bbb5086bd93c1fae005b3">
-   <span id="infopaneltitle-for-df8441526d3bbb5086bd93c1fae005b3" style="display:none">Info about the 'codecs' external reference.</span><a href="https://tools.ietf.org/html/rfc6381#">https://tools.ietf.org/html/rfc6381#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-df8441526d3bbb5086bd93c1fae005b3">5. Codecs Parameter String</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-37f26709df4ef02bccacdfb3c0626342" class="dfn-panel" data-for="37f26709df4ef02bccacdfb3c0626342" id="infopanel-for-37f26709df4ef02bccacdfb3c0626342">
-   <span id="infopaneltitle-for-37f26709df4ef02bccacdfb3c0626342" style="display:none">Info about the 'coll' external reference.</span><a href="https://www.webmproject.org/vp9/mp4/#">https://www.webmproject.org/vp9/mp4/#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-37f26709df4ef02bccacdfb3c0626342">2.3.4. Semantics</a> <a href="#ref-for-37f26709df4ef02bccacdfb3c0626342">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-b459180629a753573e7c799ce3a57f45" class="dfn-panel" data-for="b459180629a753573e7c799ce3a57f45" id="infopanel-for-b459180629a753573e7c799ce3a57f45">
-   <span id="infopaneltitle-for-b459180629a753573e7c799ce3a57f45" style="display:none">Info about the 'smdm' external reference.</span><a href="https://www.webmproject.org/vp9/mp4/#">https://www.webmproject.org/vp9/mp4/#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-37f26709df4ef02bccacdfb3c0626342">2.3.4. Semantics</a> <a href="#ref-for-37f26709df4ef02bccacdfb3c0626342">(2)</a>
-   </ul>
-  </aside>
-  <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span class="content">Terms defined by reference</span><a class="self-link" href="#index-defined-elsewhere"></a></h3>
-  <ul class="index">
-   <li>
-    <a data-link-type="biblio">[AV1]</a> defines the following terms:
-    <ul>
-     <li><span class="dfn-paneled" id="f03adbccd0f71dbd64db6303812028fa">av1 bitstream</span>
-     <li><span class="dfn-paneled" id="3832a1720800015cee7b0703f7328c35">buffer_removal_time</span>
-     <li><span class="dfn-paneled" id="559078660a67169a7db62632f96f0f56">color_config</span>
-     <li><span class="dfn-paneled" id="ffd6a013c385ccb5c6974a36f39c9419">delayed random access point</span>
-     <li><span class="dfn-paneled" id="d58adec65fc7472c4103fc0ce48ffad2">frame header obu</span>
-     <li><span class="dfn-paneled" id="61cc567b8d2c37a5482c59baafb6b8ff">frame obu</span>
-     <li><span class="dfn-paneled" id="44bda72a7faed4e3816a653629cc8043">frame_presentation_time</span>
-     <li><span class="dfn-paneled" id="8720e7b90737c186d54125451a6578c3">initial_display_delay_minus_1</span>
-     <li><span class="dfn-paneled" id="320f0b8648b2c86937bd5df124c0721c">inter frame</span>
-     <li><span class="dfn-paneled" id="48602d12010b460d62666543107dbb8c">intra-only frame</span>
-     <li><span class="dfn-paneled" id="f8cc04bc4613acfd789110ae277063a3">key frame</span>
-     <li><span class="dfn-paneled" id="295ffdcbb0b3062ed4b9d6391d6555f8">key frame dependent recovery point</span>
-     <li><span class="dfn-paneled" id="effc5260e6921d7355a31efe9e581f5e">low overhead bitstream format</span>
-     <li><span class="dfn-paneled" id="2f273a655f76900606361284b223527c">max_frame_height_minus_1</span>
-     <li><span class="dfn-paneled" id="607e04e0caddfe3e61efb6ea8770130c">max_frame_width_minus_1</span>
-     <li><span class="dfn-paneled" id="cd1fdf90baa77d8296625f83349a558c">metadata obu</span>
-     <li><span class="dfn-paneled" id="eb0782dfea22c80ac75d63b45a421c45">mono_chrome</span>
-     <li><span class="dfn-paneled" id="fad0316db590b5b97f2a78eea1a20567">obu</span>
-     <li><span class="dfn-paneled" id="bcf179fe5dc66841b8ee6f4bf7024547">obu header</span>
-     <li><span class="dfn-paneled" id="f9c9cd91bc5ff3e8007f3109e4172022">obu_has_size_field</span>
-     <li><span class="dfn-paneled" id="ae8c5a5a2224e16c570d1c72ed7f9ca3">obu_size</span>
-     <li><span class="dfn-paneled" id="f41c7b6b409e9137c8b46b0e8192eae7">open_bitstream_unit</span>
-     <li><span class="dfn-paneled" id="cb42042994dfc555541c6d2a5b7ac21c">padding obu</span>
-     <li><span class="dfn-paneled" id="2a14dd3c3618065abd5e1df01cd526ce">random access point</span>
-     <li><span class="dfn-paneled" id="49d4b1324b3e6175214f1de9258652c0">redundant frame header obu</span>
-     <li><span class="dfn-paneled" id="6af483fb580bc8cd300825f157ed0f23">seq_level_idx</span>
-     <li><span class="dfn-paneled" id="8c994b92162ebe7ad58fd07f5c951f12">seq_tier</span>
-     <li><span class="dfn-paneled" id="0eb96964e5fc585c9760f0cc0f7aa6c3">sequence header obu</span>
-     <li><span class="dfn-paneled" id="8ee84de303b43ec62bb21bf9598287a4">show_existing_frame</span>
-     <li><span class="dfn-paneled" id="6ab350adb6a8d151ef893c148883c990">show_frame</span>
-     <li><span class="dfn-paneled" id="006a3bf07dac848d227cff3f097563c8">subsampling_x</span>
-     <li><span class="dfn-paneled" id="eb7fc80c7183639b2fdb78f61ce55a11">subsampling_y</span>
-     <li><span class="dfn-paneled" id="8a2bfdfe0bd189daf691bcd702fe8795">switch frame</span>
-     <li><span class="dfn-paneled" id="e07ec093ac0a6bd7e497becb0e4dedc1">temporal delimiter obu</span>
-     <li><span class="dfn-paneled" id="d71db54f0eeaab45d4615cfd2ca2de3d">temporal unit</span>
-     <li><span class="dfn-paneled" id="d85adcf672535355b6f59f8ae2a7f312">tile group obu</span>
-     <li><span class="dfn-paneled" id="f22120bb18bc0c18d65d82eeeca12326">tile list obu</span>
-     <li><span class="dfn-paneled" id="0bf077100eb0b617c5b8accac3f316c4">timing_info</span>
-     <li><span class="dfn-paneled" id="b23305d39492fb7d58d912b81e05ff07">timing_info_present_flag</span>
-    </ul>
-   <li>
-    <a data-link-type="biblio">[CENC]</a> defines the following terms:
-    <ul>
-     <li><span class="dfn-paneled" id="935be28bb2ef232ad16945b2cdb69c0f">bytesofcleardata</span>
-     <li><span class="dfn-paneled" id="0823905e938db14fa0ce9f54969cea70">bytesofprotecteddata</span>
-     <li><span class="dfn-paneled" id="2b285af7abdae2d4aab3a7cbedfdd6ab">cbcs</span>
-     <li><span class="dfn-paneled" id="742c038dd8361327983a92bd81e21859">cenc</span>
-    </ul>
-   <li>
-    <a data-link-type="biblio">[CMAF]</a> defines the following terms:
-    <ul>
-     <li><span class="dfn-paneled" id="1568b5183e757fdee5323510bdd1a120">cmaf video track</span>
-     <li><span class="dfn-paneled" id="76fc7918b57ae33e76892402603c6b72">cmfc</span>
-    </ul>
-   <li>
-    <a data-link-type="biblio">[ISOBMFF]</a> defines the following terms:
-    <ul>
-     <li><span class="dfn-paneled" id="952f01526c87045a89015e38d1931006">bitr</span>
-     <li><span class="dfn-paneled" id="52b8fcc7cef8754159148e684a77d02e">clap</span>
-     <li><span class="dfn-paneled" id="15388b1662efccc6c0d26daa21eb8a02">clli</span>
-     <li><span class="dfn-paneled" id="6351cd1cc3bfb6561867f56587297705">colr</span>
-     <li><span class="dfn-paneled" id="1b1b183a7f9c84aa05248368ea7421ba">ctts</span>
-     <li><span class="dfn-paneled" id="295c612b69b22d9306c1004b4766efa2">iso6</span>
-     <li><span class="dfn-paneled" id="fcf81bf686786e641e169d84d6f6c84a">mdcv</span>
-     <li><span class="dfn-paneled" id="f2de67e75e1151de694a7aedeccb7e6c">nclx</span>
-     <li><span class="dfn-paneled" id="d72ed60b4c680fa6477d565e9553dd28">visualsampleentry</span>
-    </ul>
-   <li>
-    <a data-link-type="biblio">[RFC6381]</a> defines the following terms:
-    <ul>
-     <li><span class="dfn-paneled" id="df8441526d3bbb5086bd93c1fae005b3">codecs</span>
-    </ul>
-   <li>
-    <a data-link-type="biblio">[VP9]</a> defines the following terms:
-    <ul>
-     <li><span class="dfn-paneled" id="37f26709df4ef02bccacdfb3c0626342">coll</span>
-     <li><span class="dfn-paneled" id="b459180629a753573e7c799ce3a57f45">smdm</span>
-    </ul>
-  </ul>
-  <h2 class="no-num no-ref heading settled" id="references"><span class="content">References</span><a class="self-link" href="#references"></a></h2>
-  <h3 class="no-num no-ref heading settled" id="normative"><span class="content">Normative References</span><a class="self-link" href="#normative"></a></h3>
-  <dl>
-   <dt id="biblio-av1">[AV1]
-   <dd><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf"><cite>AV1 Bitstream &amp; Decoding Process Specification</cite></a>. Standard. URL: <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf">https://aomediacodec.github.io/av1-spec/av1-spec.pdf</a>
-   <dt id="biblio-cenc">[CENC]
-   <dd><a href="https://www.iso.org/standard/68042.html"><cite>Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files</cite></a>. Standard. URL: <a href="https://www.iso.org/standard/68042.html">https://www.iso.org/standard/68042.html</a>
-   <dt id="biblio-cmaf">[CMAF]
-   <dd><a href="https://www.iso.org/standard/71975.html"><cite>Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media</cite></a>. Standard. URL: <a href="https://www.iso.org/standard/71975.html">https://www.iso.org/standard/71975.html</a>
-   <dt id="biblio-isobmff">[ISOBMFF]
-   <dd><a href="http://standards.iso.org/ittf/PubliclyAvailableStandards/c068960_ISO_IEC_14496-12_2015.zip"><cite>Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format</cite></a>. December 2015. International Standard. URL: <a href="http://standards.iso.org/ittf/PubliclyAvailableStandards/c068960_ISO_IEC_14496-12_2015.zip">http://standards.iso.org/ittf/PubliclyAvailableStandards/c068960_ISO_IEC_14496-12_2015.zip</a>
-   <dt id="biblio-rfc2119">[RFC2119]
-   <dd>S. Bradner. <a href="https://datatracker.ietf.org/doc/html/rfc2119"><cite>Key words for use in RFCs to Indicate Requirement Levels</cite></a>. March 1997. Best Current Practice. URL: <a href="https://datatracker.ietf.org/doc/html/rfc2119">https://datatracker.ietf.org/doc/html/rfc2119</a>
-   <dt id="biblio-rfc6381">[RFC6381]
-   <dd>R. Gellens; D. Singer; P. Frojdh. <a href="https://www.rfc-editor.org/rfc/rfc6381"><cite>The 'Codecs' and 'Profiles' Parameters for "Bucket" Media Types</cite></a>. August 2011. Proposed Standard. URL: <a href="https://www.rfc-editor.org/rfc/rfc6381">https://www.rfc-editor.org/rfc/rfc6381</a>
-  </dl>
-  <aside aria-labelledby="infopaneltitle-for-av1sampleentry" class="dfn-panel" data-for="av1sampleentry" id="infopanel-for-av1sampleentry">
-   <span id="infopaneltitle-for-av1sampleentry" style="display:none">Info about the 'AV1SampleEntry' definition.</span><b><a href="#av1sampleentry">#av1sampleentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-av1sampleentry">2.1. General Requirements &amp; Brands</a>
-    <li><a href="#ref-for-av1sampleentry①">2.2.4. Semantics</a>
-    <li><a href="#ref-for-av1sampleentry②">2.4. AV1 Sample Format</a> <a href="#ref-for-av1sampleentry③">(2)</a>
-    <li><a href="#ref-for-av1sampleentry④">3. CMAF AV1 track format</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-av1codecconfigurationbox" class="dfn-panel" data-for="av1codecconfigurationbox" id="infopanel-for-av1codecconfigurationbox">
-   <span id="infopaneltitle-for-av1codecconfigurationbox" style="display:none">Info about the 'AV1CodecConfigurationBox' definition.</span><b><a href="#av1codecconfigurationbox">#av1codecconfigurationbox</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-av1codecconfigurationbox">2.2.2. Description</a>
-    <li><a href="#ref-for-av1codecconfigurationbox①">2.2.4. Semantics</a> <a href="#ref-for-av1codecconfigurationbox②">(2)</a>
-    <li><a href="#ref-for-av1codecconfigurationbox③">2.3.4. Semantics</a> <a href="#ref-for-av1codecconfigurationbox④">(2)</a> <a href="#ref-for-av1codecconfigurationbox⑤">(3)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-high_bitdepth" class="dfn-panel" data-for="high_bitdepth" id="infopanel-for-high_bitdepth">
-   <span id="infopaneltitle-for-high_bitdepth" style="display:none">Info about the 'high_bitdepth' definition.</span><b><a href="#high_bitdepth">#high_bitdepth</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-high_bitdepth">2.3.4. Semantics</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-twelve_bit" class="dfn-panel" data-for="twelve_bit" id="infopanel-for-twelve_bit">
-   <span id="infopaneltitle-for-twelve_bit" style="display:none">Info about the 'twelve_bit' definition.</span><b><a href="#twelve_bit">#twelve_bit</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-twelve_bit">2.3.4. Semantics</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-chroma_subsampling_x" class="dfn-panel" data-for="chroma_subsampling_x" id="infopanel-for-chroma_subsampling_x">
-   <span id="infopaneltitle-for-chroma_subsampling_x" style="display:none">Info about the 'chroma_subsampling_x' definition.</span><b><a href="#chroma_subsampling_x">#chroma_subsampling_x</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-chroma_subsampling_x">2.3.4. Semantics</a>
-   </ul>
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-  <aside aria-labelledby="infopaneltitle-for-chroma_subsampling_y" class="dfn-panel" data-for="chroma_subsampling_y" id="infopanel-for-chroma_subsampling_y">
-   <span id="infopaneltitle-for-chroma_subsampling_y" style="display:none">Info about the 'chroma_subsampling_y' definition.</span><b><a href="#chroma_subsampling_y">#chroma_subsampling_y</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-chroma_subsampling_y">2.3.4. Semantics</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-chroma_sample_position" class="dfn-panel" data-for="chroma_sample_position" id="infopanel-for-chroma_sample_position">
-   <span id="infopaneltitle-for-chroma_sample_position" style="display:none">Info about the 'chroma_sample_position' definition.</span><b><a href="#chroma_sample_position">#chroma_sample_position</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-chroma_sample_position">2.3.4. Semantics</a> <a href="#ref-for-chroma_sample_position①">(2)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-initial_presentation_delay_minus_one" class="dfn-panel" data-for="initial_presentation_delay_minus_one" id="infopanel-for-initial_presentation_delay_minus_one">
-   <span id="infopaneltitle-for-initial_presentation_delay_minus_one" style="display:none">Info about the 'initial_presentation_delay_minus_one' definition.</span><b><a href="#initial_presentation_delay_minus_one">#initial_presentation_delay_minus_one</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-initial_presentation_delay_minus_one">2.3.4. Semantics</a> <a href="#ref-for-initial_presentation_delay_minus_one①">(2)</a> <a href="#ref-for-initial_presentation_delay_minus_one②">(3)</a> <a href="#ref-for-initial_presentation_delay_minus_one③">(4)</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-av1-sample" class="dfn-panel" data-for="av1-sample" id="infopanel-for-av1-sample">
-   <span id="infopaneltitle-for-av1-sample" style="display:none">Info about the 'AV1 Sample' definition.</span><b><a href="#av1-sample">#av1-sample</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-av1-sample">2.2.2. Description</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-av1forwardkeyframesamplegroupentry" class="dfn-panel" data-for="av1forwardkeyframesamplegroupentry" id="infopanel-for-av1forwardkeyframesamplegroupentry">
-   <span id="infopaneltitle-for-av1forwardkeyframesamplegroupentry" style="display:none">Info about the 'AV1ForwardKeyFrameSampleGroupEntry' definition.</span><b><a href="#av1forwardkeyframesamplegroupentry">#av1forwardkeyframesamplegroupentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-av1forwardkeyframesamplegroupentry">2.3.4. Semantics</a>
-    <li><a href="#ref-for-av1forwardkeyframesamplegroupentry①">2.4. AV1 Sample Format</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-av1multiframesamplegroupentry" class="dfn-panel" data-for="av1multiframesamplegroupentry" id="infopanel-for-av1multiframesamplegroupentry">
-   <span id="infopaneltitle-for-av1multiframesamplegroupentry" style="display:none">Info about the 'AV1MultiFrameSampleGroupEntry' definition.</span><b><a href="#av1multiframesamplegroupentry">#av1multiframesamplegroupentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-av1multiframesamplegroupentry">2.4. AV1 Sample Format</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-av1s" class="dfn-panel" data-for="av1s" id="infopanel-for-av1s">
-   <span id="infopaneltitle-for-av1s" style="display:none">Info about the 'av1s' definition.</span><b><a href="#av1s">#av1s</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-av1s">2.4. AV1 Sample Format</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-av1switchframesamplegroupentry" class="dfn-panel" data-for="av1switchframesamplegroupentry" id="infopanel-for-av1switchframesamplegroupentry">
-   <span id="infopaneltitle-for-av1switchframesamplegroupentry" style="display:none">Info about the 'AV1SwitchFrameSampleGroupEntry' definition.</span><b><a href="#av1switchframesamplegroupentry">#av1switchframesamplegroupentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-av1switchframesamplegroupentry">2.4. AV1 Sample Format</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-av1metadatasamplegroupentry" class="dfn-panel" data-for="av1metadatasamplegroupentry" id="infopanel-for-av1metadatasamplegroupentry">
-   <span id="infopaneltitle-for-av1metadatasamplegroupentry" style="display:none">Info about the 'AV1MetadataSampleGroupEntry' definition.</span><b><a href="#av1metadatasamplegroupentry">#av1metadatasamplegroupentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-av1metadatasamplegroupentry">2.4. AV1 Sample Format</a>
-   </ul>
-  </aside>
-  <aside aria-labelledby="infopaneltitle-for-cmaf-av1-track" class="dfn-panel" data-for="cmaf-av1-track" id="infopanel-for-cmaf-av1-track">
-   <span id="infopaneltitle-for-cmaf-av1-track" style="display:none">Info about the 'CMAF AV1 Track' definition.</span><b><a href="#cmaf-av1-track">#cmaf-av1-track</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="#ref-for-cmaf-av1-track">3. CMAF AV1 track format</a>
-    <li><a href="#ref-for-cmaf-av1-track①">4. Common Encryption</a>
-   </ul>
-  </aside>
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-        hideAllDfnPanels();
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-
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diff --git a/v120_main.html b/v120_main.html
deleted file mode 100644
index e6c6035..0000000
--- a/v120_main.html
+++ /dev/null
@@ -1,3368 +0,0 @@
-<!DOCTYPE html>
-<!-- saved from url=(0043)https://aomediacodec.github.io/av1-isobmff/ -->
-<html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
-  
-  <title>AV1 Codec ISO Media File Format Binding</title>
-  <meta content="width=device-width, initial-scale=1, shrink-to-fit=no" name="viewport">
-<style data-fill-with="stylesheet">/******************************************************************************
- *                   Style sheet for the W3C specifications                   *
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- * Indices
- *   - .toc for the Table of Contents (<ol class="toc">)
- *     + <span class="secno"> for the section numbers
- *   - #toc for the Table of Contents (<nav id="toc">)
- *   - ul.index for Indices (<a href="#ref">term</a><span>, in § N.M</span>)
- *   - table.index for Index Tables (e.g. for properties or elements)
- *
- * Structural Markup
- *   - table.data for general data tables
- *     -> use 'scope' attribute, <colgroup>, <thead>, and <tbody> for best results !
- *     -> use <table class='complex data'> for extra-complex tables
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- *     -> use <td class='pre'> when manual line breaks/indentation would help readability
- *   - dl.switch for switch statements
- *   - ol.algorithm for algorithms (helps to visualize nesting)
- *   - .figure and .caption (HTML4) and figure and figcaption (HTML5)
- *     -> .sidefigure for right-floated figures
- *   - ins/del
- *     -> ins/del.c### for candidate and proposed changes (amendments)
- *
- * Code
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- *
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- *   - .note       for informative notes             (div, p, span, aside, details)
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- *   - .advisement for loud normative statements     (div, p, strong)
- *   - .annoying-warning for spec obsoletion notices (div, aside, details)
- *   - .correction for "candidate corrections"       (div, aside, details, section)
- *   - .addition   for "candidate additions"         (div, aside, details, section)
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- *   - .addition.proposed   for "proposed additions"   (div, aside, details, section)
- *
- * Definition Boxes
- *   - pre.def   for WebIDL definitions
- *   - table.def for tables that define other entities (e.g. CSS properties)
- *   - dl.def    for definition lists that define other entitles (e.g. HTML elements)
- *
- * Numbering
- *   - .secno for section numbers in .toc and headings (<span class='secno'>3.2</span>)
- *   - .marker for source-inserted example/figure/issue numbers (<span class='marker'>Issue 4</span>)
- *   - ::before styled for CSS-generated issue/example/figure numbers:
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- *        figcaption::before,
- *        .caption::before { content: "Figure "  counter(figure) " ";  }
- *        .example::before { content: "Example " counter(example) " "; }
- *        .issue::before   { content: "Issue "   counter(issue) " ";   }
- *
- * Header Stuff (ignore, just don't conflict with these classes)
- *   - .head for the header
- *   - .copyright for the copyright
- *
- * Outdated warning for old specs
- *
- * Miscellaneous
- *   - .overlarge for things that should be as wide as possible, even if
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- *     on its container, depending on the effect desired.
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- *
- *   - js-added ToC jump links (see fixup.js)
- *
- ******************************************************************************/
-
-/* color variables included separately for reliability */
-
-/******************************************************************************/
-/*                                    Body                                    */
-/******************************************************************************/
-
-	html {
-	}
-
-	body {
-		counter-reset: example figure issue;
-
-		/* Layout */
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-/** Header ********************************************************************/
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-	div.head { margin-bottom: 1em; }
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-		font-size: 220%;
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-	div.head h2 { margin-bottom: 1.5em;}
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-	.head .logo {
-		float: right;
-		margin: 0.4rem 0 0.2rem .4rem;
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-
-	.head img[src*="logos/W3C"] {
-		display: block;
-		border: solid #1a5e9a;
-		border: solid var(--logo-bg);
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-	.head a:hover > img[src*="logos/W3C"],
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-			border-top-right-radius: 1.33em;
-
-			color: #707070;
-			color: var(--tocnav-normal-text);
-			background: white;
-			background: var(--tocnav-normal-bg);
-		}
-		#toc-nav > a:hover,
-		#toc-nav > a:focus {
-			color: black;
-			color: var(--tocnav-hover-text);
-			background: #f8f8f8;
-			background: var(--tocnav-hover-bg);
-		}
-		#toc-nav > a:active {
-			color: #c00;
-			color: var(--tocnav-active-text);
-			background: white;
-			background: var(--tocnav-active-bg);
-		}
-
-		#toc-nav > #toc-jump {
-			padding-bottom: 2em;
-			margin-bottom: -1.9em;
-		}
-
-		/* statusbar gets in the way on keyboard focus; remove once browsers fix */
-		#toc-nav > a[href="#toc"]:not(:hover):focus:last-child {
-			padding-bottom: 1.5rem;
-		}
-
-		#toc-nav:not(:hover) > a:not(:focus) > span + span {
-			/* Ideally this uses :focus-within on #toc-nav */
-			display: none;
-		}
-		#toc-nav > a > span + span {
-			padding-right: 0.2em;
-		}
-	}
-
-/** ToC Sidebar ***************************************************************/
-
-	/* Floating sidebar */
-	@media screen {
-		body.toc-sidebar #toc {
-			position: fixed;
-			top: 0; bottom: 0;
-			left: 0;
-			width: 23.5em;
-			max-width: 80%;
-			max-width: calc(100% - 2em - 26px);
-			overflow: auto;
-			padding: 0 1em;
-			padding-left: 42px;
-			padding-left: calc(1em + 26px);
-			color: black;
-			color: var(--tocsidebar-text);
-			background: inherit;
-			background-color: #f7f8f9;
-			background-color: var(--tocsidebar-bg);
-			z-index: 1;
-			box-shadow: -.1em 0 .25em rgba(0,0,0,.1) inset;
-			box-shadow: -.1em 0 .25em var(--tocsidebar-shadow) inset;
-		}
-		body.toc-sidebar #toc h2 {
-			margin-top: .8rem;
-			font-variant: small-caps;
-			font-variant: all-small-caps;
-			text-transform: lowercase;
-			font-weight: bold;
-			color: gray;
-			color: hsla(203,20%,40%,.7);
-			color: var(--tocsidebar-heading-text);
-		}
-		body.toc-sidebar #toc-jump:not(:focus) {
-			width: 0;
-			height: 0;
-			padding: 0;
-			position: absolute;
-			overflow: hidden;
-		}
-	}
-	/* Hide main scroller when only the ToC is visible anyway */
-	@media screen and (max-width: 28em) {
-		body.toc-sidebar {
-			overflow: hidden;
-		}
-	}
-
-	/* Sidebar with its own space */
-	@media screen and (min-width: 78em) {
-		body:not(.toc-inline) #toc {
-			position: fixed;
-			top: 0; bottom: 0;
-			left: 0;
-			width: 23.5em;
-			overflow: auto;
-			padding: 0 1em;
-			padding-left: 42px;
-			padding-left: calc(1em + 26px);
-			color: black;
-			color: var(--tocsidebar-text);
-			background: inherit;
-			background-color: #f7f8f9;
-			background-color: var(--tocsidebar-bg);
-			z-index: 1;
-			box-shadow: -.1em 0 .25em rgba(0,0,0,.1) inset;
-			box-shadow: -.1em 0 .25em var(--tocsidebar-shadow) inset;
-		}
-		body:not(.toc-inline) #toc h2 {
-			margin-top: .8rem;
-			font-variant: small-caps;
-			font-variant: all-small-caps;
-			text-transform: lowercase;
-			font-weight: bold;
-			color: gray;
-			color: hsla(203,20%,40%,.7);
-			color: var(--tocsidebar-heading-text);
-		}
-
-		body:not(.toc-inline) {
-			padding-left: 29em;
-		}
-		/* See also Overflow section at the bottom */
-
-		body:not(.toc-inline) #toc-jump:not(:focus) {
-			width: 0;
-			height: 0;
-			padding: 0;
-			position: absolute;
-			overflow: hidden;
-		}
-	}
-	@media screen and (min-width: 90em) {
-		body:not(.toc-inline) {
-			margin: 0 4em;
-		}
-	}
-
-/******************************************************************************/
-/*                                Sectioning                                  */
-/******************************************************************************/
-
-/** Headings ******************************************************************/
-
-	h1, h2, h3, h4, h5, h6, dt {
-		page-break-after: avoid;
-		page-break-inside: avoid;
-		font: 100% sans-serif;   /* Reset all font styling to clear out UA styles */
-		font-family: inherit;	/* Inherit the font family. */
-		line-height: 1.2;		/* Keep wrapped headings compact */
-		hyphens: manual;		/* Hyphenated headings look weird */
-	}
-
-	h2, h3, h4, h5, h6 {
-		margin-top: 3rem;
-	}
-
-	h1, h2, h3 {
-		color: #005A9C;
-		color: var(--heading-text);
-	}
-
-	h1 { font-size: 170%; }
-	h2 { font-size: 140%; }
-	h3 { font-size: 120%; }
-	h4 { font-weight: bold; }
-	h5 { font-style: italic; }
-	h6 { font-variant: small-caps; }
-	dt { font-weight: bold; }
-
-/** Subheadings ***************************************************************/
-
-	h1 + h2,
-	#profile-and-date {
-		/* #profile-and-date is a subtitle in an H2 under the H1 */
-		margin-top: 0;
-	}
-	h2 + h3,
-	h3 + h4,
-	h4 + h5,
-	h5 + h6 {
-		margin-top: 1.2em; /* = 1 x line-height */
-	}
-
-/** Section divider ***********************************************************/
-
-	:not(.head) > :not(.head) + hr {
-		font-size: 1.5em;
-		text-align: center;
-		margin: 1em auto;
-		height: auto;
-		color: black;
-		color: var(--hr-text);
-		border: transparent solid 0;
-		background: transparent;
-	}
-	:not(.head) > hr::before {
-		content: "\2727\2003\2003\2727\2003\2003\2727";
-	}
-
-/******************************************************************************/
-/*                            Paragraphs and Lists                            */
-/******************************************************************************/
-
-	p {
-		margin: 1em 0;
-	}
-
-	dd > p:first-child,
-	li > p:first-child {
-		margin-top: 0;
-	}
-
-	ul, ol {
-		margin-left: 0;
-		padding-left: 2em;
-	}
-
-	li {
-		margin: 0.25em 0 0.5em;
-		padding: 0;
-	}
-
-	dl dd {
-		margin: 0 0 .5em 2em;
-	}
-
-	.head dd + dd { /* compact for header */
-		margin-top: -.5em;
-	}
-
-	/* Style for algorithms */
-	ol.algorithm ol:not(.algorithm),
-	.algorithm > ol ol:not(.algorithm) {
-	border-left: 0.5em solid #DEF;
-	border-left: 0.5em solid var(--algo-border);
-	}
-
-	/* Put nice boxes around each algorithm. */
-	[data-algorithm]:not(.heading) {
-	 padding: .5em;
-	 border: thin solid #ddd;
-	 border: thin solid var(--algo-border);
-	 border-radius: .5em;
-	 margin: .5em calc(-0.5em - 1px);
-	}
-	[data-algorithm]:not(.heading) > :first-child {
-	 margin-top: 0;
-	}
-	[data-algorithm]:not(.heading) > :last-child {
-	 margin-bottom: 0;
-	}
-
-	/* Style for switch/case <dl>s */
-	dl.switch > dd > ol.only,
-	dl.switch > dd > .only > ol {
-	margin-left: 0;
-	}
-	dl.switch > dd > ol.algorithm,
-	dl.switch > dd > .algorithm > ol {
-	margin-left: -2em;
-	}
-	dl.switch {
-	padding-left: 2em;
-	}
-	dl.switch > dt {
-	text-indent: -1.5em;
-	margin-top: 1em;
-	}
-	dl.switch > dt + dt {
-	margin-top: 0;
-	}
-	dl.switch > dt::before {
-	content: '\21AA';
-	padding: 0 0.5em 0 0;
-	display: inline-block;
-	width: 1em;
-	text-align: right;
-	line-height: 0.5em;
-	}
-
-/** Terminology Markup ********************************************************/
-
-
-/******************************************************************************/
-/*                                 Inline Markup                              */
-/******************************************************************************/
-
-/** Terminology Markup ********************************************************/
-	dfn   { /* Defining instance */
-		font-weight: bolder;
-	}
-	a > i { /* Instance of term */
-		font-style: normal;
-	}
-	dt dfn code, code.idl {
-		font-size: inherit;
-	}
-	dfn var {
-		font-style: normal;
-	}
-
-/** Change Marking ************************************************************/
-
-	del {
-		color: #aa0000;
-		color: var(--del-text);
-		background: transparent;
-		background: var(--del-bg);
-		text-decoration: line-through;
-	}
-	ins {
-		color: #006100;
-		color: var(--ins-text);
-		background: transparent;
-		background: var(--ins-bg);
-		text-decoration: underline;
-	}
-
-	/* for amendments (candidate/proposed changes) */
-
-	.amendment ins, .correction ins, .addition ins,
-	ins[class^=c] {
-		text-decoration-style: dotted;
-	}
-	.amendment del, .correction del, .addition del,
-	del[class^=c] {
-		text-decoration-style: dotted;
-	}
-	.amendment.proposed ins, .correction.proposed ins, .addition.proposed ins,
-	ins[class^=c].proposed {
-		text-decoration-style: double;
-	}
-	.amendment.proposed del, .correction.proposed del, .addition.proposed del,
-	del[class^=c].proposed {
-		text-decoration-style: double;
-	}
-
-/** Miscellaneous improvements to inline formatting ***************************/
-
-	sup {
-		vertical-align: super;
-		font-size: 80%
-	}
-
-/******************************************************************************/
-/*                                    Code                                    */
-/******************************************************************************/
-
-/** General monospace/pre rules ***********************************************/
-
-	pre, code, samp {
-		font-family: Menlo, Consolas, "DejaVu Sans Mono", Monaco, monospace;
-		font-size: .9em;
-		hyphens: none;
-		text-transform: none;
-		text-align: left;
-		text-align: start;
-		font-variant: normal;
-		orphans: 3;
-		widows: 3;
-		page-break-before: avoid;
-	}
-	pre code,
-	code code {
-		font-size: 100%;
-	}
-
-	pre {
-		margin-top: 1em;
-		margin-bottom: 1em;
-		overflow: auto;
-	}
-
-/** Inline Code fragments *****************************************************/
-
-	/* Do something nice. */
-
-/******************************************************************************/
-/*                                    Links                                   */
-/******************************************************************************/
-
-/** General Hyperlinks ********************************************************/
-
-	/* We hyperlink a lot, so make it less intrusive */
-	a[href] {
-		color: #034575;
-		color: var(--a-normal-text);
-		text-decoration: underline #707070;
-		text-decoration: underline var(--a-normal-underline);
-		text-decoration-skip-ink: none;
-	}
-	a:visited {
-		color: #034575;
-		color: var(--a-visited-text);
-		text-decoration-color: #bbb;
-		text-decoration-color: var(--a-visited-underline);
-	}
-
-	/* Indicate interaction with the link */
-	a[href]:focus,
-	a[href]:hover {
-		text-decoration-thickness: 2px;
-	}
-	a[href]:active {
-		color: #c00;
-		color: var(--a-active-text);
-		text-decoration-color: #c00;
-		text-decoration-color: var(--a-active-underline);
-	}
-
-	/* Backout above styling for W3C logo */
-	.head .logo,
-	.head .logo a {
-		border: none;
-		text-decoration: none;
-		background: transparent;
-	}
-
-/******************************************************************************/
-/*                                    Images                                  */
-/******************************************************************************/
-
-	img {
-		border-style: none;
-	}
-
-	img, svg {
-		/* Intentionally not color-scheme aware. */
-		background: white;
-	}
-
-	/* For autogen numbers, add
-	  .caption::before, figcaption::before { content: "Figure " counter(figure) ". "; }
-	*/
-
-	figure, .figure, .sidefigure {
-		page-break-inside: avoid;
-		text-align: center;
-		margin: 2.5em 0;
-	}
-	.figure img,	.sidefigure img,	figure img,
-	.figure object, .sidefigure object, figure object {
-		max-width: 100%;
-		margin: auto;
-		height: auto;
-	}
-	.figure pre, .sidefigure pre, figure pre {
-		text-align: left;
-		display: table;
-		margin: 1em auto;
-	}
-	.figure table, figure table {
-		margin: auto;
-	}
-	@media screen and (min-width: 20em) {
-		.sidefigure {
-			float: right;
-			width: 50%;
-			margin: 0 0 0.5em 0.5em;
-		}
-	}
-	.caption, figcaption, caption {
-		font-style: italic;
-		font-size: 90%;
-	}
-	.caption::before, figcaption::before, figcaption > .marker {
-		font-weight: bold;
-	}
-	.caption, figcaption {
-		counter-increment: figure;
-	}
-
-	/* DL list is indented 2em, but figure inside it is not */
-	dd > .figure, dd > figure { margin-left: -2em; }
-
-/******************************************************************************/
-/*                             Colored Boxes                                  */
-/******************************************************************************/
-
-	.issue, .note, .example, .assertion, .advisement, blockquote,
-	.amendment, .correction, .addition {
-		margin: 1em auto;
-		padding: .5em;
-		border: .5em;
-		border-left-style: solid;
-		page-break-inside: avoid;
-	}
-	span.issue, span.note {
-		padding: .1em .5em .15em;
-		border-right-style: solid;
-	}
-
-	blockquote > :first-child,
-	.note  > p:first-child,
-	.issue > p:first-child,
-	.amendment > p:first-child,
-	.correction > p:first-child,
-	.addition > p:first-child {
-		margin-top: 0;
-	}
-	blockquote > :last-child,
-	.note  > p:last-child,
-	.issue > p:last-child,
-	.amendment > p:last-child,
-	.correction > p:last-child,
-	.addition > p:last-child {
-		margin-bottom: 0;
-	}
-
-
-	.issue::before, .issue > .marker,
-	.example::before, .example > .marker,
-	.note::before, .note > .marker,
-	details.note > summary > .marker,
-	.amendment::before, .amendment > .marker,
-	details.amendment > summary > .marker,
-	.addition::before, .addition > .marker,
-	addition.amendment > summary > .marker,
-	.correction::before, .correction > .marker,
-	correction.amendment > summary > .marker
-	{
-		text-transform: uppercase;
-		padding-right: 1em;
-	}
-
-	.example::before, .example > .marker {
-		display: block;
-		padding-right: 0em;
-	}
-
-/** Blockquotes ***************************************************************/
-
-	blockquote {
-		border-color: silver;
-		border-color: var(--blockquote-border);
-		background: transparent;
-		background: var(--blockquote-bg);
-		color: currentcolor;
-		color: var(--blockquote-text);
-	}
-
-/** Open issue ****************************************************************/
-
-	.issue {
-		border-color: #e05252;
-		border-color: var(--issue-border);
-		background: #fbe9e9;
-		background: var(--issue-bg);
-		color: black;
-		color: var(--issue-text);
-		counter-increment: issue;
-		overflow: auto;
-	}
-	.issue::before, .issue > .marker {
-		color: #831616;
-		color: var(--issueheading-text);
-	}
-	/* Add .issue::before { content: "Issue " counter(issue) " "; } for autogen numbers,
-	  or use class="marker" to mark up the issue number in source. */
-
-/** Example *******************************************************************/
-
-	.example {
-		border-color: #e0cb52;
-		border-color: var(--example-border);
-		background: #fcfaee;
-		background: var(--example-bg);
-		color: black;
-		color: var(--example-text);
-		counter-increment: example;
-		overflow: auto;
-		clear: both;
-	}
-	.example::before, .example > .marker {
-		color: #574b0f;
-		color: var(--exampleheading-text);
-	}
-	/* Add .example::before { content: "Example " counter(example) " "; } for autogen numbers,
-	  or use class="marker" to mark up the example number in source. */
-
-/** Non-normative Note ********************************************************/
-
-	.note {
-		border-color: #52e052;
-		border-color: var(--note-border);
-		background: #e9fbe9;
-		background: var(--note-bg);
-		color: black;
-		color: var(--note-text);
-		overflow: auto;
-	}
-
-	.note::before, .note > .marker,
-	details.note > summary {
-		color: hsl(120, 70%, 30%);
-		color: var(--noteheading-text);
-	}
-	/* Add .note::before { content: "Note "; } for autogen label,
-	  or use class="marker" to mark up the label in source. */
-
-	details.note[open] > summary {
-		border-bottom: 1px silver solid;
-		border-bottom: 1px var(--notesummary-underline) solid;
-	}
-
-/** Assertion Box *************************************************************/
-	/*  for assertions in algorithms */
-
-	.assertion {
-		border-color: #AAA;
-		border-color: var(--assertion-border);
-		background: #EEE;
-		background: var(--assertion-bg);
-		color: black;
-		color: var(--assertion-text);
-	}
-
-/** Advisement Box ************************************************************/
-	/*  for attention-grabbing normative statements */
-
-	.advisement {
-		border-color: orange;
-		border-color: var(--advisement-border);
-		border-style: none solid;
-		background: #fec;
-		background: var(--advisement-bg);
-		color: black;
-		color: var(--advisement-text);
-	}
-	strong.advisement {
-		display: block;
-		text-align: center;
-	}
-	.advisement::before, .advisement > .marker {
-		color: #b35f00;
-		color: var(--advisementheading-text);
-	}
-
-/** Amendment Box *************************************************************/
-
-	.amendment, .correction, .addition {
-		border-color: #330099;
-		border-color: var(--amendment-border);
-		background: #F5F0FF;
-		background: var(--amendment-bg);
-		color: black;
-		color: var(--amendment-text);
-	}
-	.amendment.proposed, .correction.proposed, .addition.proposed {
-		border-style: solid;
-		border-block-width: 0.25em;
-	}
-	.amendment::before, .amendment > .marker,
-	details.amendment > summary::before, details.amendment > summary > .marker,
-	.correction::before, .correction > .marker,
-	details.correction > summary::before, details.correction > summary > .marker,
-	.addition::before, .addition > .marker,
-	details.addition > summary::before, details.addition > summary > .marker {
-		color: #220066;
-		color: var(--amendmentheading-text);
-	}
-	.amendment.proposed::before, .amendment.proposed > .marker,
-	details.amendment.proposed > summary::before, details.amendment.proposed > summary > .marker,
-	.correction.proposed::before, .correction.proposed > .marker,
-	details.correction.proposed > summary::before, details.correction.proposed > summary > .marker,
-	.addition.proposed::before, .addition.proposed > .marker,
-	details.addition.proposed > summary::before, details.addition.proposed > summary > .marker {
-		font-weight: bold;
-	}
-
-/** Spec Obsoletion Notice ****************************************************/
-	/* obnoxious obsoletion notice for older/abandoned specs. */
-
-	details {
-		display: block;
-	}
-	summary {
-		font-weight: bolder;
-	}
-
-	.annoying-warning:not(details),
-	details.annoying-warning:not([open]) > summary,
-	details.annoying-warning[open] {
-		background: hsla(40,100%,50%,0.95);
-		background: var(--warning-bg);
-		color: black;
-		color: var(--warning-text);
-		padding: .75em 1em;
-		border: red;
-		border: var(--warning-border);
-		border-style: solid none;
-		box-shadow: 0 2px 8px black;
-		text-align: center;
-	}
-	.annoying-warning :last-child {
-		margin-bottom: 0;
-	}
-
-@media not print {
-	details.annoying-warning[open] {
-		position: fixed;
-		left: 0;
-		right: 0;
-		bottom: 2em;
-		z-index: 1000;
-	}
-}
-
-	details.annoying-warning:not([open]) > summary {
-		text-align: center;
-	}
-
-/** Entity Definition Boxes ***************************************************/
-
-	.def {
-		padding: .5em 1em;
-		background: #def;
-		background: var(--def-bg);
-		margin: 1.2em 0;
-		border-left: 0.5em solid #8ccbf2;
-		border-left: 0.5em solid var(--def-border);
-		color: black;
-		color: var(--def-text);
-	}
-
-/******************************************************************************/
-/*                                    Tables                                  */
-/******************************************************************************/
-
-	th, td {
-		text-align: left;
-		text-align: start;
-	}
-
-/** Property/Descriptor Definition Tables *************************************/
-
-	table.def {
-		/* inherits .def box styling, see above */
-		width: 100%;
-		border-spacing: 0;
-	}
-
-	table.def td,
-	table.def th {
-		padding: 0.5em;
-		vertical-align: baseline;
-		border-bottom: 1px solid #bbd7e9;
-		border-bottom: 1px solid var(--defrow-border);
-	}
-
-	table.def > tbody > tr:last-child th,
-	table.def > tbody > tr:last-child td {
-		border-bottom: 0;
-	}
-
-	table.def th {
-		font-style: italic;
-		font-weight: normal;
-		padding-left: 1em;
-		width: 3em;
-	}
-
-	/* For when values are extra-complex and need formatting for readability */
-	table td.pre {
-		white-space: pre-wrap;
-	}
-
-	/* A footnote at the bottom of a def table */
-	table.def td.footnote {
-		padding-top: 0.6em;
-	}
-	table.def td.footnote::before {
-		content: " ";
-		display: block;
-		height: 0.6em;
-		width: 4em;
-		border-top: thin solid;
-	}
-
-/** Data tables (and properly marked-up index tables) *************************/
-	/*
-		<table class="data"> highlights structural relationships in a table
-		when correct markup is used (e.g. thead/tbody, th vs. td, scope attribute)
-
-		Use class="complex data" for particularly complicated tables --
-		(This will draw more lines: busier, but clearer.)
-
-		Use class="long" on table cells with paragraph-like contents
-		(This will adjust text alignment accordingly.)
-		Alternately use class="longlastcol" on tables, to have the last column assume "long".
-	*/
-
-	table {
-		word-wrap: normal;
-		overflow-wrap: normal;
-		hyphens: manual;
-	}
-
-	table.data,
-	table.index {
-		margin: 1em auto;
-		border-collapse: collapse;
-		border: hidden;
-		width: 100%;
-	}
-	table.data caption,
-	table.index caption {
-		max-width: 50em;
-		margin: 0 auto 1em;
-	}
-
-	table.data td,  table.data th,
-	table.index td, table.index th {
-		padding: 0.5em 1em;
-		border-width: 1px;
-		border-color: silver;
-		border-color: var(--datacell-border);
-		border-top-style: solid;
-	}
-
-	table.data thead td:empty {
-		padding: 0;
-		border: 0;
-	}
-
-	table.data  thead,
-	table.index thead,
-	table.data  tbody,
-	table.index tbody {
-		border-bottom: 2px solid;
-	}
-
-	table.data colgroup,
-	table.index colgroup {
-		border-left: 2px solid;
-	}
-
-	table.data  tbody th:first-child,
-	table.index tbody th:first-child  {
-		border-right: 2px solid;
-		border-top: 1px solid silver;
-		border-top: 1px solid var(--datacell-border);
-		padding-right: 1em;
-	}
-
-	table.data th[colspan],
-	table.data td[colspan] {
-		text-align: center;
-	}
-
-	table.complex.data th,
-	table.complex.data td {
-		border: 1px solid silver;
-		border: 1px solid var(--datacell-border);
-		text-align: center;
-	}
-
-	table.data.longlastcol td:last-child,
-	table.data td.long {
-		vertical-align: baseline;
-		text-align: left;
-	}
-
-	table.data img {
-		vertical-align: middle;
-	}
-
-
-/*
-Alternate table alignment rules
-
-	table.data,
-	table.index {
-		text-align: center;
-	}
-
-	table.data  thead th[scope="row"],
-	table.index thead th[scope="row"] {
-		text-align: right;
-	}
-
-	table.data  tbody th:first-child,
-	table.index tbody th:first-child  {
-		text-align: right;
-	}
-
-Possible extra rowspan handling
-
-	table.data  tbody th[rowspan]:not([rowspan='1']),
-	table.index tbody th[rowspan]:not([rowspan='1']),
-	table.data  tbody td[rowspan]:not([rowspan='1']),
-	table.index tbody td[rowspan]:not([rowspan='1']) {
-		border-left: 1px solid silver;
-	}
-
-	table.data  tbody th[rowspan]:first-child,
-	table.index tbody th[rowspan]:first-child,
-	table.data  tbody td[rowspan]:first-child,
-	table.index tbody td[rowspan]:first-child{
-		border-left: 0;
-		border-right: 1px solid silver;
-	}
-*/
-
-/******************************************************************************/
-/*                                  Indices                                   */
-/******************************************************************************/
-
-
-/** Table of Contents *********************************************************/
-
-	.toc a {
-		/* More spacing; use padding to make it part of the click target. */
-		padding: 0.1rem 1px 0;
-		/* Larger, more consistently-sized click target */
-		display: block;
-		/* Switch to using border-bottom for underlines */
-		text-decoration: none;
-		border-bottom: 1px solid;
-		/* Reverse color scheme */
-		color: black;
-		color: var(--toclink-text);
-		border-color: #3980b5;
-		border-color: var(--toclink-underline);
-	}
-	.toc a:visited {
-		color: black;
-		color: var(--toclink-visited-text);
-		border-color: #054572;
-		border-color: var(--toclink-visited-underline);
-	}
-	.toc a:focus,
-	.toc a:hover {
-		background: rgba(75%, 75%, 75%, .25);
-		background: var(--a-hover-bg);
-		border-bottom-width: 3px;
-		margin-bottom: -2px;
-	}
-	.toc a:not(:focus):not(:hover) {
-		/* Allow colors to cascade through from link styling */
-		border-bottom-color: transparent;
-	}
-
-	.toc, .toc ol, .toc ul, .toc li {
-		list-style: none; /* Numbers must be inlined into source */
-		/* because generated content isn't search/selectable and markers can't do multilevel yet */
-		margin:  0;
-		padding: 0;
-	}
-	.toc {
-		line-height: 1.1em;
-	}
-
-	/* ToC not indented until third level, but font style & margins show hierarchy */
-	.toc > li			{ font-weight: bold;   }
-	.toc > li li		 { font-weight: normal; }
-	.toc > li li li	  { font-size:   95%;	}
-	.toc > li li li li	{ font-size:   90%;	}
-	.toc > li li li li li { font-size:   85%;	}
-
-	/* @supports not (display:grid) { */
-		.toc > li			{ margin: 1.5rem 0;	}
-		.toc > li li		 { margin: 0.3rem 0;	}
-		.toc > li li li	  { margin-left: 2rem;   }
-
-		/* Section numbers in a column of their own */
-		.toc .secno {
-			float: left;
-			width: 4rem;
-			white-space: nowrap;
-		}
-		.toc > li li li li .secno { font-size: 85%; }
-		.toc > li li li li li .secno { font-size: 100%; }
-
-		.toc li {
-			clear: both;
-		}
-
-		:not(li) > .toc			 { margin-left:  5rem; }
-		.toc .secno				 { margin-left: -5rem; }
-		.toc > li li li .secno	  { margin-left: -7rem; }
-		.toc > li li li li .secno	{ margin-left: -9rem; }
-		.toc > li li li li li .secno { margin-left: -11rem; }
-
-		/* Tighten up indentation in narrow ToCs */
-		@media (max-width: 30em) {
-			:not(li) > .toc			 { margin-left:  4rem; }
-			.toc .secno				 { margin-left: -4rem; }
-			.toc > li li li			 { margin-left:  1rem; }
-			.toc > li li li .secno	  { margin-left: -5rem; }
-			.toc > li li li li .secno	{ margin-left: -6rem; }
-			.toc > li li li li li .secno { margin-left: -7rem; }
-		}
-		/* Loosen it on wide screens */
-		@media screen and (min-width: 78em) {
-			body:not(.toc-inline) :not(li) > .toc			 { margin-left:  4rem; }
-			body:not(.toc-inline) .toc .secno				 { margin-left: -4rem; }
-			body:not(.toc-inline) .toc > li li li			 { margin-left:  1rem; }
-			body:not(.toc-inline) .toc > li li li .secno	  { margin-left: -5rem; }
-			body:not(.toc-inline) .toc > li li li li .secno	{ margin-left: -6rem; }
-			body:not(.toc-inline) .toc > li li li li li .secno { margin-left: -7rem; }
-	}
-	/* } */
-
-	@supports (display:grid) and (display:contents) {
-		/* Use #toc over .toc to override non-@supports rules. */
-		#toc {
-			display: grid;
-			align-content: start;
-			grid-template-columns: auto 1fr;
-			grid-column-gap: 1rem;
-			column-gap: 1rem;
-			grid-row-gap: .6rem;
-			row-gap: .6rem;
-		}
-		#toc h2 {
-			grid-column: 1 / -1;
-			margin-bottom: 0;
-		}
-		#toc ol,
-		#toc li,
-		#toc a {
-			display: contents;
-			/* Switch <a> to subgrid when supported */
-		}
-		#toc span {
-			margin: 0;
-		}
-		#toc > .toc > li > a > span {
-			/* The spans of the top-level list,
-			  comprising the first items of each top-level section. */
-			margin-top: 1.1rem;
-		}
-		#toc#toc .secno { /* Ugh, need more specificity to override base.css */
-			grid-column: 1;
-			width: auto;
-			margin-left: 0;
-		}
-		#toc .content {
-			grid-column: 2;
-			width: auto;
-			margin-right: 1rem;
-		}
-		#toc .content:hover,
-		#toc .content:focus {
-			background: rgba(75%, 75%, 75%, .25);
-			background: var(--a-hover-bg);
-			border-bottom: 3px solid #054572;
-			border-bottom: 3px solid var(--toclink-underline);
-			margin-bottom: -3px;
-		}
-		#toc li li li .content {
-			margin-left: 1rem;
-		}
-		#toc li li li li .content {
-			margin-left: 2rem;
-		}
-	}
-
-
-/** Index *********************************************************************/
-
-	/* Index Lists: Layout */
-	ul.index	  { margin-left: 0; columns: 15em; text-indent: 1em hanging; }
-	ul.index li	{ margin-left: 0; list-style: none; break-inside: avoid; }
-	ul.index li li { margin-left: 1em; }
-	ul.index dl	{ margin-top: 0; }
-	ul.index dt	{ margin: .2em 0 .2em 20px;}
-	ul.index dd	{ margin: .2em 0 .2em 40px;}
-	/* Index Lists: Typography */
-	ul.index ul,
-	ul.index dl { font-size: smaller; }
-	@media not print {
-		ul.index li span:not(.dfn-paneled) {
-			white-space: nowrap;
-			color: transparent; }
-		ul.index li a:hover + span,
-		ul.index li a:focus + span {
-			color: #707070;
-			color: var(--indexinfo-text);
-		}
-	}
-
-/** Index Tables *****************************************************/
-	/* See also the data table styling section, which this effectively subclasses */
-
-	table.index {
-		font-size: small;
-		border-collapse: collapse;
-		border-spacing: 0;
-		text-align: left;
-		margin: 1em 0;
-	}
-
-	table.index td,
-	table.index th {
-		padding: 0.4em;
-	}
-
-	table.index tr:hover td:not([rowspan]),
-	table.index tr:hover th:not([rowspan]) {
-		color: black;
-		color: var(--indextable-hover-text);
-		background: #f7f8f9;
-		background: var(--indextable-hover-bg);
-	}
-
-	/* The link in the first column in the property table (formerly a TD) */
-	table.index th:first-child a {
-		font-weight: bold;
-	}
-
-/** Outdated warning **********************************************************/
-
-.outdated-spec {
-	color: black;
-	color: var(--outdatedspec-text);
-	background-color: rgba(0,0,0,0.5);
-	background-color: var(--outdatedspec-bg);
-}
-
-.outdated-warning {
-	position: fixed;
-	bottom: 50%;
-	left: 0;
-	right: 0;
-	margin: 0 auto;
-	width: 50%;
-	background: maroon;
-	background: var(--outdated-bg);
-	color: white;
-	color: var(--outdated-text);
-	border-radius: 1em;
-	box-shadow: 0 0 1em red;
-	box-shadow: 0 0 1em var(--outdated-shadow);
-	padding: 2em;
-	text-align: center;
-	z-index: 2;
-}
-
-.outdated-warning a {
-	color: currentcolor;
-	background: transparent;
-}
-
-.edited-rec-warning {
-	background: darkorange;
-	background: var(--editedrec-bg);
-	box-shadow: 0 0 1em;
-}
-
-.outdated-warning button {
-	color: var(--outdated-text);
-	border-radius: 1em;
-	box-shadow: 0 0 1em red;
-	box-shadow: 0 0 1em var(--outdated-shadow);
-	padding: 2em;
-	text-align: center;
-	z-index: 2;
-}
-
-.outdated-warning a {
-	color: currentcolor;
-	background: transparent;
-}
-
-.edited-rec-warning {
-	background: darkorange;
-	background: var(--editedrec-bg);
-	box-shadow: 0 0 1em;
-}
-
-.outdated-warning button {
-	position: absolute;
-	top: 0;
-	right:0;
-	margin: 0;
-	border: 0;
-	padding: 0.25em 0.5em;
-	background: transparent;
-	color: white;
-	color: var(--outdated-text);
-	font:1em sans-serif;
-	text-align:center;
-}
-
-.outdated-warning span {
-	display: block;
-}
-
-.outdated-collapsed {
-	bottom: 0;
-	border-radius: 0;
-	width: 100%;
-	padding: 0;
-}
-
-/******************************************************************************/
-/*                                    Print                                   */
-/******************************************************************************/
-
-	@media print {
-		/* Pages have their own margins. */
-		html {
-			margin: 0;
-		}
-		/* Serif for print. */
-		body {
-			font-family: serif;
-		}
-
-		.outdated-warning {
-			position: absolute;
-			border-style: solid;
-			border-color: red;
-		}
-
-		.outdated-warning input {
-			display: none;
-		}
-	}
-	@page {
-		margin: 1.5cm 1.1cm;
-	}
-
-
-
-/******************************************************************************/
-/*                             Overflow Control                               */
-/******************************************************************************/
-
-	.figure .caption, .sidefigure .caption, figcaption {
-		/* in case figure is overlarge, limit caption to 50em */
-		max-width: 50rem;
-		margin-left: auto;
-		margin-right: auto;
-	}
-	.overlarge {
-		/* Magic to create good item positioning:
-		  "content column" is 50ems wide at max; less on smaller screens.
-		  Extra space (after ToC + content) is empty on the right.
-
-		  1. When item < content column, centers item in column.
-		  2. When content < item < available, left-aligns.
-		  3. When item > available, fills available + scroll bar.
-		*/
-		display: grid;
-		grid-template-columns: minmax(0, 50em);
-	}
-	.overlarge > table {
-		/* limit preferred width of table */
-		max-width: 50em;
-		margin-left: auto;
-		margin-right: auto;
-	}
-
-	@media (min-width: 55em) {
-		.overlarge {
-			margin-right: calc(13px + 26.5rem - 50vw);
-			max-width: none;
-		}
-	}
-	@media screen and (min-width: 78em) {
-		body:not(.toc-inline) .overlarge {
-			/* 30.5em body padding 50em content area */
-			margin-right: calc(40em - 50vw) !important;
-		}
-	}
-	@media screen and (min-width: 90em) {
-		body:not(.toc-inline) .overlarge {
-			/* 4em html margin 30.5em body padding 50em content area */
-			margin-right: calc(84.5em - 100vw) !important;
-		}
-	}
-
-	@media not print {
-		.overlarge {
-			overflow-x: auto;
-			/* See Lea Verou's explanation background-attachment:
-			* http://lea.verou.me/2012/04/background-attachment-local/
-			*
-			background: top left  / 4em 100% linear-gradient(to right,  #ffffff, rgba(255, 255, 255, 0)) local,
-						top right / 4em 100% linear-gradient(to left, #ffffff, rgba(255, 255, 255, 0)) local,
-						top left  / 1em 100% linear-gradient(to right,  #c3c3c5, rgba(195, 195, 197, 0)) scroll,
-						top right / 1em 100% linear-gradient(to left, #c3c3c5, rgba(195, 195, 197, 0)) scroll,
-						white;
-			background-repeat: no-repeat;
-			*/
-		}
-	}
-</style>
-  <meta content="Bikeshed version dfbc2b297, updated Thu Nov 11 15:52:32 2021 -0800" name="generator">
-  <link href="https://aomediacodec.github.io/av1-isobmff/" rel="canonical">
-  <meta content="91ae751e7ef9d7969041c7ba2966160c99a5e16f" name="document-revision">
-<style>/* style-autolinks */
-
-.css.css, .property.property, .descriptor.descriptor {
-    color: var(--a-normal-text);
-    font-size: inherit;
-    font-family: inherit;
-}
-.css::before, .property::before, .descriptor::before {
-    content: "‘";
-}
-.css::after, .property::after, .descriptor::after {
-    content: "’";
-}
-.property, .descriptor {
-    /* Don't wrap property and descriptor names */
-    white-space: nowrap;
-}
-.type { /* CSS value <type> */
-    font-style: italic;
-}
-pre .property::before, pre .property::after {
-    content: "";
-}
-[data-link-type="property"]::before,
-[data-link-type="propdesc"]::before,
-[data-link-type="descriptor"]::before,
-[data-link-type="value"]::before,
-[data-link-type="function"]::before,
-[data-link-type="at-rule"]::before,
-[data-link-type="selector"]::before,
-[data-link-type="maybe"]::before {
-    content: "‘";
-}
-[data-link-type="property"]::after,
-[data-link-type="propdesc"]::after,
-[data-link-type="descriptor"]::after,
-[data-link-type="value"]::after,
-[data-link-type="function"]::after,
-[data-link-type="at-rule"]::after,
-[data-link-type="selector"]::after,
-[data-link-type="maybe"]::after {
-    content: "’";
-}
-
-[data-link-type].production::before,
-[data-link-type].production::after,
-.prod [data-link-type]::before,
-.prod [data-link-type]::after {
-    content: "";
-}
-
-[data-link-type=element],
-[data-link-type=element-attr] {
-    font-family: Menlo, Consolas, "DejaVu Sans Mono", monospace;
-    font-size: .9em;
-}
-[data-link-type=element]::before { content: "<" }
-[data-link-type=element]::after  { content: ">" }
-
-[data-link-type=biblio] {
-    white-space: pre;
-}</style>
-<style>/* style-colors */
-
-/* Any --*-text not paired with a --*-bg is assumed to have a transparent bg */
-:root {
-    color-scheme: light dark;
-
-    --text: black;
-    --bg: white;
-
-    --unofficial-watermark: url(https://www.w3.org/StyleSheets/TR/2016/logos/UD-watermark);
-
-    --logo-bg: #1a5e9a;
-    --logo-active-bg: #c00;
-    --logo-text: white;
-
-    --tocnav-normal-text: #707070;
-    --tocnav-normal-bg: var(--bg);
-    --tocnav-hover-text: var(--tocnav-normal-text);
-    --tocnav-hover-bg: #f8f8f8;
-    --tocnav-active-text: #c00;
-    --tocnav-active-bg: var(--tocnav-normal-bg);
-
-    --tocsidebar-text: var(--text);
-    --tocsidebar-bg: #f7f8f9;
-    --tocsidebar-shadow: rgba(0,0,0,.1);
-    --tocsidebar-heading-text: hsla(203,20%,40%,.7);
-
-    --toclink-text: var(--text);
-    --toclink-underline: #3980b5;
-    --toclink-visited-text: var(--toclink-text);
-    --toclink-visited-underline: #054572;
-
-    --heading-text: #005a9c;
-
-    --hr-text: var(--text);
-
-    --algo-border: #def;
-
-    --del-text: red;
-    --del-bg: transparent;
-    --ins-text: #080;
-    --ins-bg: transparent;
-
-    --a-normal-text: #034575;
-    --a-normal-underline: #bbb;
-    --a-visited-text: var(--a-normal-text);
-    --a-visited-underline: #707070;
-    --a-hover-bg: rgba(75%, 75%, 75%, .25);
-    --a-active-text: #c00;
-    --a-active-underline: #c00;
-
-    --blockquote-border: silver;
-    --blockquote-bg: transparent;
-    --blockquote-text: currentcolor;
-
-    --issue-border: #e05252;
-    --issue-bg: #fbe9e9;
-    --issue-text: var(--text);
-    --issueheading-text: #831616;
-
-    --example-border: #e0cb52;
-    --example-bg: #fcfaee;
-    --example-text: var(--text);
-    --exampleheading-text: #574b0f;
-
-    --note-border: #52e052;
-    --note-bg: #e9fbe9;
-    --note-text: var(--text);
-    --noteheading-text: hsl(120, 70%, 30%);
-    --notesummary-underline: silver;
-
-    --assertion-border: #aaa;
-    --assertion-bg: #eee;
-    --assertion-text: black;
-
-    --advisement-border: orange;
-    --advisement-bg: #fec;
-    --advisement-text: var(--text);
-    --advisementheading-text: #b35f00;
-
-    --warning-border: red;
-    --warning-bg: hsla(40,100%,50%,0.95);
-    --warning-text: var(--text);
-
-    --amendment-border: #330099;
-    --amendment-bg: #F5F0FF;
-    --amendment-text: var(--text);
-    --amendmentheading-text: #220066;
-
-    --def-border: #8ccbf2;
-    --def-bg: #def;
-    --def-text: var(--text);
-    --defrow-border: #bbd7e9;
-
-    --datacell-border: silver;
-
-    --indexinfo-text: #707070;
-
-    --indextable-hover-text: black;
-    --indextable-hover-bg: #f7f8f9;
-
-    --outdatedspec-bg: rgba(0, 0, 0, .5);
-    --outdatedspec-text: black;
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-    }
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-       which is quite common in practice... */
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-    :root {
-        --dfnpanel-bg: #222;
-        --dfnpanel-text: var(--text);
-    }
-}</style>
- </head><body class="h-entry toc-sidebar"><p id="toc-nav"><a id="toc-jump" href="https://aomediacodec.github.io/av1-isobmff/#toc"><span aria-hidden="true">↑</span> <span>Jump to Table of Contents</span></a><a id="toc-toggle" href="https://aomediacodec.github.io/av1-isobmff/#toc"><span aria-hidden="true">←</span> <span>Collapse Sidebar</span></a></p>
-  <div class="head">
-   <p data-fill-with="logo"><a class="logo" href="https://www.aomedia.org/"> <img alt="AOM" height="174" src="./v1.2.0_files/aomedia-icon-only.png" width="174"> </a> </p>
-   <h1 class="p-name no-ref" id="title">AV1 Codec ISO Media File Format Binding</h1>
-   <h2 class="p-name no-num no-toc no-ref heading settled" id="subtitle"><span class="content">v1.2.0</span></h2>
-   <h3 class="no-num no-toc no-ref heading settled" id="profile-and-date"><span class="content">AOM Final Deliverable, <time class="dt-updated" datetime="2019-12-12">12 December 2019</time></span></h3>
-   <div data-fill-with="spec-metadata">
-    <dl>
-     <dt>This version:
-     <dd><a class="u-url" href="https://aomediacodec.github.io/av1-isobmff/v1.2.0.html">https://aomediacodec.github.io/av1-isobmff/v1.2.0.html</a>
-     <dt>Latest version:
-     <dd><a class="u-url" href="https://aomediacodec.github.io/av1-isobmff/">https://aomediacodec.github.io/av1-isobmff/</a>
-     </dd><dt>Issue Tracking:
-     </dt><dd><a href="https://github.com/AOMediaCodec/av1-isobmff/issues/">GitHub</a>
-     </dd><dt class="editor">Editors:
-     </dt><dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:cconcolato@netflix.com">Cyril Concolato</a> (<span class="p-org org">Netflix</span>)
-     </dd><dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:tom.finegan@google.com">Tom Finegan</a> (<span class="p-org org">Google</span>)
-     </dd><dt>Previously approved version:
-     </dt><dd><a href="https://aomediacodec.github.io/av1-isobmff/v1.1.0.html">v1.1.0</a>
-    </dd></dl>
-   </div>
-   <div data-fill-with="warning"></div>
-   <p class="copyright" data-fill-with="copyright">
-    </p><p>Copyright 2019, <a href="https://aomedia.org/">AOM</a></p>
-    <p>Licensing information is available at <a href="http://aomedia.org/license/">http://aomedia.org/license/</a></p>
-    <p>The MATERIALS ARE PROVIDED “AS IS.” The Alliance for Open Media, its members, and its contributors expressly disclaim any warranties (express, implied, or otherwise), including implied warranties of merchantability, non-infringement, fitness for a particular purpose, or title, related to the materials. The entire risk as to implementing or otherwise using the materials is assumed by the implementer and user. IN NO EVENT WILL THE ALLIANCE FOR OPEN MEDIA, ITS MEMBERS, OR CONTRIBUTORS BE LIABLE TO ANY OTHER PARTY FOR LOST PROFITS OR ANY FORM OF INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OF ANY CHARACTER FROM ANY CAUSES OF ACTION OF ANY KIND WITH RESPECT TO THIS DELIVERABLE OR ITS GOVERNING AGREEMENT, WHETHER BASED ON BREACH OF CONTRACT, TORT (INCLUDING NEGLIGENCE), OR OTHERWISE, AND WHETHER OR NOT THE OTHER MEMBER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</p>
-   <p></p>
-   <hr title="Separator for header">
-  </div>
-  <div class="p-summary" data-fill-with="abstract">
-   <h2 class="no-num no-toc no-ref heading settled" id="abstract"><span class="content">Abstract</span></h2>
-   <p>This document specifies the storage format for <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a> bitstreams in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-isobmff">[ISOBMFF]</a> tracks as well as in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cmaf">[CMAF]</a> files.</p>
-  </div>
-  <nav data-fill-with="table-of-contents" id="toc">
-   <h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
-   <ol class="toc" role="directory">
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#bitstream-overview"><span class="secno">1</span> <span class="content">Bitstream features overview</span></a>
-    </li><li>
-     <a href="https://aomediacodec.github.io/av1-isobmff/#basic-encapsulation"><span class="secno">2</span> <span class="content">Basic Encapsulation Scheme</span></a>
-     <ol class="toc">
-      <li><a href="https://aomediacodec.github.io/av1-isobmff/#brands"><span class="secno">2.1</span> <span class="content">General Requirements &amp; Brands</span></a>
-      </li><li>
-       <a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-section"><span class="secno">2.2</span> <span class="content">AV1 Sample Entry</span></a>
-       <ol class="toc">
-        <li><a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-definition"><span class="secno">2.2.1</span> <span class="content">Definition</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-description"><span class="secno">2.2.2</span> <span class="content">Description</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-syntax"><span class="secno">2.2.3</span> <span class="content">Syntax</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-semantics"><span class="secno">2.2.4</span> <span class="content">Semantics</span></a>
-       </li></ol>
-      </li><li>
-       <a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-section"><span class="secno">2.3</span> <span class="content">AV1 Codec Configuration Box</span></a>
-       <ol class="toc">
-        <li><a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-definition"><span class="secno">2.3.1</span> <span class="content">Definition</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-description"><span class="secno">2.3.2</span> <span class="content">Description</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-syntax"><span class="secno">2.3.3</span> <span class="content">Syntax</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-semantics"><span class="secno">2.3.4</span> <span class="content">Semantics</span></a>
-       </li></ol>
-      </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#sampleformat"><span class="secno">2.4</span> <span class="content">AV1 Sample Format</span></a>
-      </li><li>
-       <a href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry"><span class="secno">2.5</span> <span class="content">AV1 Forward Key Frame sample group entry</span></a>
-       <ol class="toc">
-        <li><a href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-definition"><span class="secno">2.5.1</span> <span class="content">Definition</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-description"><span class="secno">2.5.2</span> <span class="content">Description</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-syntax"><span class="secno">2.5.3</span> <span class="content">Syntax</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-semantics"><span class="secno">2.5.4</span> <span class="content">Semantics</span></a>
-       </li></ol>
-      </li><li>
-       <a href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry"><span class="secno">2.6</span> <span class="content">AV1 Multi-Frame sample group entry</span></a>
-       <ol class="toc">
-        <li><a href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry-definition"><span class="secno">2.6.1</span> <span class="content">Definition</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry-description"><span class="secno">2.6.2</span> <span class="content">Description</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry-syntax"><span class="secno">2.6.3</span> <span class="content">Syntax</span></a>
-       </li></ol>
-      </li><li>
-       <a href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry"><span class="secno">2.7</span> <span class="content">AV1 Switch Frame sample group entry</span></a>
-       <ol class="toc">
-        <li><a href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry-definition"><span class="secno">2.7.1</span> <span class="content">Definition</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry-description"><span class="secno">2.7.2</span> <span class="content">Description</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry-syntax"><span class="secno">2.7.3</span> <span class="content">Syntax</span></a>
-       </li></ol>
-      </li><li>
-       <a href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry"><span class="secno">2.8</span> <span class="content">AV1 Metadata sample group entry</span></a>
-       <ol class="toc">
-        <li><a href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-definition"><span class="secno">2.8.1</span> <span class="content">Definition</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-description"><span class="secno">2.8.2</span> <span class="content">Description</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-syntax"><span class="secno">2.8.3</span> <span class="content">Syntax</span></a>
-        </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-semantics"><span class="secno">2.8.4</span> <span class="content">Semantics</span></a>
-       </li></ol>
-     </li></ol>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#cmaf"><span class="secno">3</span> <span class="content">CMAF AV1 track format</span></a>
-    </li><li>
-     <a href="https://aomediacodec.github.io/av1-isobmff/#CommonEncryption"><span class="secno">4</span> <span class="content">Common Encryption</span></a>
-     <ol class="toc">
-      <li><a href="https://aomediacodec.github.io/av1-isobmff/#subsample-encryption"><span class="secno">4.1</span> <span class="content">General Subsample Encryption constraints</span></a>
-      </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#subsample-encryption-illustration"><span class="secno">4.2</span> <span class="content">Subsample Encryption Illustration</span></a>
-     </li></ol>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#codecsparam"><span class="secno">5</span> <span class="content">Codecs Parameter String</span></a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#changelist"><span class="secno">6</span> <span class="content">Changes since v1.1.0 release</span></a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#conformance"><span class="secno"></span> <span class="content"> Conformance</span></a>
-    </li><li>
-     <a href="https://aomediacodec.github.io/av1-isobmff/#index"><span class="secno"></span> <span class="content">Index</span></a>
-     <ol class="toc">
-      <li><a href="https://aomediacodec.github.io/av1-isobmff/#index-defined-here"><span class="secno"></span> <span class="content">Terms defined by this specification</span></a>
-      </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#index-defined-elsewhere"><span class="secno"></span> <span class="content">Terms defined by reference</span></a>
-     </li></ol>
-    </li><li>
-     <a href="https://aomediacodec.github.io/av1-isobmff/#references"><span class="secno"></span> <span class="content">References</span></a>
-     <ol class="toc">
-      <li><a href="https://aomediacodec.github.io/av1-isobmff/#normative"><span class="secno"></span> <span class="content">Normative References</span></a>
-     </li></ol>
-   </li></ol>
-  </nav>
-  <main>
-   <h2 class="heading settled" data-level="1" id="bitstream-overview"><span class="secno">1. </span><span class="content">Bitstream features overview</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#bitstream-overview"></a></h2>
-    An <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1" id="ref-for-page=1">AV1 bitstream</a> is composed of a sequence of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39">OBUs</a>, grouped into <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13">Temporal Units</a>. 
-   <p>OBUs are made of a 1 or 2 bytes header, identifying in particular the type of OBU, followed by an optional length field and by an optional payload, whose presence and content depend on the OBU type. Depending on its type, an OBU can carry configuration information, metadata, or coded video data.</p>
-   <p class="note" role="note"><span>NOTE:</span> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121">Tile List OBUs</a> defined in the <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a> specification are not supported in the current version of this specification. A future version of the specification may do so.</p>
-   <p>Temporal Units are processed by a decoder in the order given by the bitstream. Each Temporal Unit is associated with a presentation time. Some Temporal Units may contain multiple frames to be decoded but only one is presented.</p>
-   <p class="note" role="note"><span>NOTE:</span> The AV1 specification defines scalability features, allowing frames from multiple layers or operating points to be present in a single temporal unit. This version of storage in ISOBMFF supports the simple storage of scalable streams in a single track, but does not specify advanced tools for handling multi-track support, layer extraction, or other scalability related use cases. A future version of the specification may do so.</p>
-   <p>Frames carried in Temporal Units may have coding dependencies on frames carried previously in the same Temporal Unit or in previous Temporal Units. Frames that can be decoded without dependencies to previous frames are of two categories: <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13①">Key Frames</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13②">Intra-only Frames</a>. Frames that cannot be decoded independently are of three categories: <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13③">Inter Frames</a>, <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13④">Switch Frames</a>, and frames with a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2">show_existing_frame</a> flag set to 1.</p>
-   <p>Key Frames with the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①">show_frame</a> flag set to 1 have the additional property that after decoding the Key Frame, all frames following the Key Frame in the bitstream can be decoded. They are called <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206">Random Access Points</a> in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a>.</p>
-   <p>Key Frames with the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②">show_frame</a> flag set to 0 are called <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206①">Delayed Random Access Points</a>. <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206②">Delayed Random Access Points</a> have the additional property that if a future <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206③">Key Frame Dependent Recovery Point</a> exists, all frames following that <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206④">Key Frame Dependent Recovery Point</a> can be decoded. A <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑤">Key Frame Dependent Recovery Point</a> is a frame with <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2③">show_existing_frame</a> set to 1 that refers to a previous <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑥">Delayed Random Access Points</a>.</p>
-   <h2 class="heading settled" data-level="2" id="basic-encapsulation"><span class="secno">2. </span><span class="content">Basic Encapsulation Scheme</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#basic-encapsulation"></a></h2>
-   <p>This section describes the basic data structures used to signal encapsulation of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1" id="ref-for-page=1①">AV1 bitstreams</a> in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-isobmff">[ISOBMFF]</a> containers.</p>
-   <h3 class="heading settled" data-level="2.1" id="brands"><span class="secno">2.1. </span><span class="content">General Requirements &amp; Brands</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#brands"></a></h3>
-   <p>A file conformant to this specification satisfies the following:</p>
-   <ul>
-    <li data-md="">
-     <p>It SHALL conform to the normative requirements of <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-isobmff">[ISOBMFF]</a></p>
-    </li><li data-md="">
-     <p>It SHALL have the <dfn class="css" data-dfn-for="ISOBMFF Brand" data-dfn-type="value" data-export="" id="valdef-isobmff-brand-av01">av01<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#valdef-isobmff-brand-av01"></a></dfn> brand among the compatible brands array of the FileTypeBox</p>
-    </li><li data-md="">
-     <p>It SHALL contain at least one track using an <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry" id="ref-for-av1sampleentry">AV1SampleEntry</a></p>
-    </li><li data-md="">
-     <p>It SHOULD indicate a structural ISOBMFF brand among the compatible brands array of the FileTypeBox, such as <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-">iso6</a></p>
-    </li><li data-md="">
-     <p>It MAY indicate CMAF brands as specified in <a href="https://aomediacodec.github.io/av1-isobmff/#cmaf">§ 3 CMAF AV1 track format</a></p>
-    </li><li data-md="">
-     <p>It MAY indicate other brands not specified in this document provided that the associated requirements do not conflict with those given in this specification</p>
-   </li></ul>
-   <p>Parsers SHALL support the structures required by the <code><a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①">iso6</a></code> brand and MAY support structures required by further ISOBMFF structural brands.</p>
-   <h3 class="heading settled" data-level="2.2" id="av1sampleentry-section"><span class="secno">2.2. </span><span class="content">AV1 Sample Entry</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-section"></a></h3>
-   <h4 class="heading settled" data-level="2.2.1" id="av1sampleentry-definition"><span class="secno">2.2.1. </span><span class="content">Definition</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-definition"></a></h4>
-<pre class="def">Sample Entry Type: <dfn data-dfn-for="AV1SampleEntry" data-dfn-type="value" data-export="" id="valdef-av1sampleentry-av01">av01<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#valdef-av1sampleentry-av01"></a></dfn>
-Container:         Sample Description Box ('stsd')
-Mandatory:         Yes
-Quantity:          One or more.
-</pre>
-   <h4 class="heading settled" data-level="2.2.2" id="av1sampleentry-description"><span class="secno">2.2.2. </span><span class="content">Description</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-description"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1sampleentry">AV1SampleEntry</dfn> sample entry identifies that the track contains <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1-sample" id="ref-for-av1-sample">AV1 Samples</a>, and uses an <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox">AV1CodecConfigurationBox</a>.</p>
-   <h4 class="heading settled" data-level="2.2.3" id="av1sampleentry-syntax"><span class="secno">2.2.3. </span><span class="content">Syntax</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-syntax"></a></h4>
-<pre>class AV1SampleEntry extends VisualSampleEntry('av01') {
-  AV1CodecConfigurationBox config;
-}
-</pre>
-   <h4 class="heading settled" data-level="2.2.4" id="av1sampleentry-semantics"><span class="secno">2.2.4. </span><span class="content">Semantics</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-semantics"></a></h4>
-   <p>The <dfn data-dfn-type="dfn" data-noexport="" id="width">width<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#width"></a></dfn> and <dfn data-dfn-type="dfn" data-noexport="" id="height">height<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#height"></a></dfn> fields of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="termref-for-②">VisualSampleEntry</a> SHALL equal the values of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2④">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑤">max_frame_height_minus_1</a> + 1 of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41">Sequence Header OBU</a> applying to the samples associated with this sample entry.</p>
-   <p>The width and height in the TrackHeaderBox SHOULD equal, respectively, the maximum RenderWidth, called MaxRenderWidth, and the maximum RenderHeight, called MaxRenderHeight, of all the frames associated with this sample entry. Additionally, if MaxRenderWidth and MaxRenderHeight values do not equal respectively the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑥">max_frame_width_minus_1</a> + 1 and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑦">max_frame_height_minus_1</a> + 1 values of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①">Sequence Header OBU</a>, a PixelAspectRatioBox box SHALL be present in the sample entry and set such that</p>
-<pre>hSpacing / vSpacing = MaxRenderWidth * (max_frame_height_minus_1 + 1) /
-                              ((max_frame_width_minus_1 + 1) * MaxRenderHeight)
-</pre>
-   <p>The <dfn data-dfn-type="dfn" data-noexport="" id="compressorname">compressorname<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#compressorname"></a></dfn> field of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="termref-for-③">VisualSampleEntry</a> is an informative name. It is formatted in a fixed 32-byte field, with the first byte set to the number of bytes to be displayed, followed by that number of bytes of displayable data, followed by padding to complete 32 bytes total (including the size byte). The value "\012AOM Coding" is RECOMMENDED; the first byte is a count of the remaining bytes, here represented by \012, which (being octal 12) is decimal 10, the number of bytes in the rest of the string.</p>
-   <p class="note" role="note"><span>NOTE:</span> Parsers may ignore the value of the compressorname field. It is specified in this document simply for legacy and backwards compatibility reasons.</p>
-   <p>The <dfn data-dfn-type="dfn" data-noexport="" id="config">config<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#config"></a></dfn> field SHALL contain an <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox①">AV1CodecConfigurationBox</a> that applies to the samples associated with this sample entry.</p>
-   <p class="note" role="note"><span>NOTE:</span> Multiple instances of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry" id="ref-for-av1sampleentry①">AV1SampleEntry</a> may be required when the track contains samples requiring a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox②">AV1CodecConfigurationBox</a> with different characteristics.</p>
-   <p>Optional boxes not specifically mentioned here can be present, in particular those indicated in the definition of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="termref-for-④">VisualSampleEntry</a> in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-isobmff">[ISOBMFF]</a>.</p>
-   <h3 class="heading settled" data-level="2.3" id="av1codecconfigurationbox-section"><span class="secno">2.3. </span><span class="content">AV1 Codec Configuration Box</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-section"></a></h3>
-   <h4 class="heading settled" data-level="2.3.1" id="av1codecconfigurationbox-definition"><span class="secno">2.3.1. </span><span class="content">Definition</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-definition"></a></h4>
-<pre class="def">Box Type:  <dfn data-dfn-type="dfn" data-export="" id="av1c">av1C<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1c"></a></dfn>
-Container: AV1 Sample Entry ('av01')
-Mandatory: Yes
-Quantity:  Exactly One
-</pre>
-   <h4 class="heading settled" data-level="2.3.2" id="av1codecconfigurationbox-description"><span class="secno">2.3.2. </span><span class="content">Description</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-description"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1codecconfigurationbox">AV1CodecConfigurationBox</dfn> contains decoder configuration information that SHALL be valid for every sample that references the sample entry.</p>
-   <h4 class="heading settled" data-level="2.3.3" id="av1codecconfigurationbox-syntax"><span class="secno">2.3.3. </span><span class="content">Syntax</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-syntax"></a></h4>
-<pre>class AV1CodecConfigurationBox extends Box('av1C'){
-  AV1CodecConfigurationRecord av1Config;
-}
-
-aligned (8) class AV1CodecConfigurationRecord {
-  unsigned int (1) marker = 1;
-  unsigned int (7) version = 1;
-  unsigned int (3) seq_profile;
-  unsigned int (5) seq_level_idx_0;
-  unsigned int (1) seq_tier_0;
-  unsigned int (1) high_bitdepth;
-  unsigned int (1) twelve_bit;
-  unsigned int (1) monochrome;
-  unsigned int (1) chroma_subsampling_x;
-  unsigned int (1) chroma_subsampling_y;
-  unsigned int (2) chroma_sample_position;
-  unsigned int (3) reserved = 0;
-
-  unsigned int (1) initial_presentation_delay_present;
-  if (initial_presentation_delay_present) {
-    unsigned int (4) initial_presentation_delay_minus_one;
-  } else {
-    unsigned int (4) reserved = 0;
-  }
-
-  unsigned int (8)[] configOBUs;
-}
-</pre>
-   <h4 class="heading settled" data-level="2.3.4" id="av1codecconfigurationbox-semantics"><span class="secno">2.3.4. </span><span class="content">Semantics</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-semantics"></a></h4>
-   <p>The <dfn data-dfn-type="dfn" data-export="" id="marker">marker<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#marker"></a></dfn> field SHALL be set to 1.</p>
-   <p class="note" role="note"><span>NOTE:</span> The marker bit ensures that the bit pattern of the first byte of the AV1CodecConfigurationRecord cannot be mistaken for an <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40" id="ref-for-page=40">OBU Header</a> byte.</p>
-   <p>The <dfn data-dfn-type="dfn" data-noexport="" id="version">version<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#version"></a></dfn> field indicates the version of the AV1CodecConfigurationRecord. The value SHALL be set to 1 for AV1CodecConfigurationRecord.</p>
-   <p>The <dfn data-dfn-type="dfn" data-export="" id="seq_profile">seq_profile<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#seq_profile"></a></dfn> field indicates the AV1 profile and SHALL be equal to the seq_profile value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②">Sequence Header OBU</a>.</p>
-   <p>The <dfn data-dfn-type="dfn" data-export="" id="seq_level_idx_0">seq_level_idx_0<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#seq_level_idx_0"></a></dfn> field indicates the value of seq_level_idx[0] found in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③">Sequence Header OBU</a> and SHALL be equal to the value of seq_level_idx[0] in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41④">Sequence Header OBU</a>.</p>
-   <p>The <dfn data-dfn-type="dfn" data-export="" id="seq_tier_0">seq_tier_0<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#seq_tier_0"></a></dfn> field indicates the value of seq_tier[0] found in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑤">Sequence Header OBU</a> and SHALL be equal to the value of seq_tier[0] in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑥">Sequence Header OBU</a>.</p>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export="" id="high_bitdepth">high_bitdepth</dfn> field indicates the value of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#high_bitdepth" id="ref-for-high_bitdepth">high_bitdepth</a> flag from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑦">Sequence Header OBU</a>.</p>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export="" id="twelve_bit">twelve_bit</dfn> field indicates the value of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#twelve_bit" id="ref-for-twelve_bit">twelve_bit</a> flag from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑧">Sequence Header OBU</a>. When twelve_bit is not present in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41⑨">Sequence Header OBU</a> the AV1CodecConfigurationRecord twelve_bit value SHALL be 0.</p>
-   <p>The <dfn data-dfn-type="dfn" data-export="" id="monochrome">monochrome<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#monochrome"></a></dfn> field indicates the value of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑧">mono_chrome</a> flag from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⓪">Sequence Header OBU</a>.</p>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export="" id="chroma_subsampling_x">chroma_subsampling_x</dfn> field indicates the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2⑨">subsampling_x</a> value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①①">Sequence Header OBU</a>.</p>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export="" id="chroma_subsampling_y">chroma_subsampling_y</dfn> field indicates the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⓪">subsampling_y</a> value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①②">Sequence Header OBU</a>.</p>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-export="" id="chroma_sample_position">chroma_sample_position</dfn> field indicates the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#chroma_sample_position" id="ref-for-chroma_sample_position">chroma_sample_position</a> value from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①③">Sequence Header OBU</a>.</p>
-   <p>When not specified in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①④">Sequence Header OBU</a>, and not defined by the conditions specified in the <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44" id="ref-for-page=44">color_config</a>, the values of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#chroma_subsampling_x" id="ref-for-chroma_subsampling_x">chroma_subsampling_x</a>, <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#chroma_subsampling_y" id="ref-for-chroma_subsampling_y">chroma_subsampling_y</a>, and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#chroma_sample_position" id="ref-for-chroma_sample_position①">chroma_sample_position</a> SHALL be 0.</p>
-   <p>The <dfn data-dfn-type="dfn" data-export="" id="initial_presentation_delay_present">initial_presentation_delay_present<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_present"></a></dfn> field indicates the presence of the initial_presentation_delay_minus_one field.</p>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="initial_presentation_delay_minus_one">initial_presentation_delay_minus_one</dfn> field indicates the number of samples (minus one) that need to be decoded prior to starting the presentation of the first sample associated with this sample entry in order to guarantee that each sample will be decoded prior to its presentation time under the constraints of the first level value indicated by <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①①">seq_level_idx</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑤">Sequence Header OBU</a> (in the configOBUs field or in the associated samples). More precisely, the following procedure SHALL not return any error:</p>
-   <ul>
-    <li data-md="">
-     <p>construct a hypothetical bitstream consisting of the OBUs carried in the sample entry followed by the OBUs carried in all the samples referring to that sample entry,</p>
-    </li><li data-md="">
-     <p>set the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①②">initial_display_delay_minus_1</a> field of each <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑥">Sequence Header OBU</a> to the number of frames minus one contained in the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one">initial_presentation_delay_minus_one</a> + 1 samples,</p>
-    </li><li data-md="">
-     <p>set the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①③">frame_presentation_time</a> field of the frame header of each presentable frame such that it matches the presentation time difference between the sample carrying this frame and the previous sample (if it exists, 0 otherwise),</p>
-    </li><li data-md="">
-     <p>apply the decoder model specified in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a> to this hypothetical bitstream using the first operating point. If <code>buffer_removal_time</code> information is present in bitstream for this operating point, the decoding schedule mode SHALL be applied, otherwise the resource availability mode SHALL be applied.</p>
-   </li></ul>
-   <p class="note" role="note"><span>NOTE:</span> With the above procedure, when smooth presentation can be guaranteed after decoding the first sample, initial_presentation_delay_minus_one is 0.</p>
-   <p class="note" role="note"><span>NOTE:</span> Because the above procedure considers all OBUs in all samples associated with a sample entry, if these OBUS form multiple coded video sequences which would have different values of <code>initial_presentation_delay_minus_one</code> if considered separately, the sample entry would signal the larger value.</p>
-   <div class="example" id="example-27bde372">
-    <a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#example-27bde372"></a> The difference between <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one①">initial_presentation_delay_minus_one</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①④">initial_display_delay_minus_1</a> can be illustrated by considering the following example: 
-<pre>a b c d e f g h
-</pre>
-    where letters correspond to frames. Assume that <code><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑤">initial_display_delay_minus_1</a></code> is 2, i.e. that once frame <code>c</code> has been decoded, all other frames in the bitstream can be presented on time. If those frames were grouped into temporal units and samples as follows: 
-<pre>[a] [b c d] [e] [f] [g] [h]
-</pre>
-    <code><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one②">initial_presentation_delay_minus_one</a></code> would be 1 because it takes presentation of 2 samples to ensure that <code>c</code> is decoded.
-But if the frames were grouped as follows: 
-<pre>[a] [b] [c] [d e f] [g] [h]
-</pre>
-    <code><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_minus_one" id="ref-for-initial_presentation_delay_minus_one③">initial_presentation_delay_minus_one</a></code> would be 2 because it takes presentation of 3 samples to ensure that <code>c</code> is decoded. 
-   </div>
-   <p>The <dfn data-dfn-type="dfn" data-export="" id="configobus">configOBUs<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#configobus"></a></dfn> field contains zero or more OBUs. Any OBU may be present provided that the following procedures produce compliant AV1 bitstreams:</p>
-   <ul>
-    <li data-md="">
-     <p>From any sync sample, an AV1 bitstream is formed by first outputting the OBUs contained in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox③">AV1CodecConfigurationBox</a> and then by outputing all OBUs in the samples themselves, in order, starting from the sync sample.</p>
-    </li><li data-md="">
-     <p>From any sample marked with the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1forwardkeyframesamplegroupentry" id="ref-for-av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</a>, an AV1 bitstream is formed by first outputting the OBUs contained in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox④">AV1CodecConfigurationBox</a> and then by outputing all OBUs in the sample itself, then by outputting all OBUs in the samples, in order, starting from the sample at the distance indicated by the sample group.</p>
-   </li></ul>
-   <p>Additionally, the configOBUs field SHALL contain at most one <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑦">Sequence Header OBU</a> and if present, it SHALL be the first OBU.</p>
-   <p class="note" role="note"><span>NOTE:</span> The configOBUs field is expected to contain only one <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑧">Sequence Header OBU</a> and zero or more <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46">Metadata OBUs</a> when applicable to all the associated samples.</p>
-   <p>OBUs stored in the configOBUs field follow the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑥">open_bitstream_unit</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39①">Low Overhead Bitstream Format</a> syntax as specified in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a>. The flag <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑦">obu_has_size_field</a> SHALL be set to 1, indicating that the size of the OBU payload follows the header, and that it is coded using LEB128.</p>
-   <p>When a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41①⑨">Sequence Header OBU</a> is contained within the configOBUs of the AV1CodecConfigurationRecord, the values present in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⓪">Sequence Header OBU</a> contained within configOBUs SHALL match the values of the AV1CodecConfigurationRecord.</p>
-   <p>The presentation times of AV1 samples are given by the ISOBMFF structures. The <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑧">timing_info_present_flag</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②①">Sequence Header OBU</a> (in the configOBUs field or in the associated samples) SHOULD be set to 0. If set to 1, the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45" id="ref-for-page=45">timing_info</a> structure of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②②">Sequence Header OBU</a>, the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2①⑨">frame_presentation_time</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⓪">buffer_removal_time</a> fields of the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49">Frame Header OBUs</a>, if present, SHALL be ignored for the purpose of timed processing of the ISOBMFF file.</p>
-   <p>The sample entry SHOULD contain a <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-⑤">colr</a> box with a colour_type set to <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-⑥">nclx</a>. If present, the values of colour_primaries, transfer_characteristics, and matrix_coefficients SHALL match the values given in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②③">Sequence Header OBU</a> (in the configOBUs field or in the associated samples) if the color_description_present_flag is set to 1. Similarly, the full_range_flag in the <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-⑦">colr</a> box shall match the color_range flag in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②④">Sequence Header OBU</a>. When configOBUs does not contain a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑤">Sequence Header OBU</a>, this box with colour_type set to <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-⑧">nclx</a> SHALL be present.</p>
-   <p>The CleanApertureBox <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-⑨">clap</a> SHOULD not be present.</p>
-   <p>For sample entries corresponding to HDR content, the MasteringDisplayColourVolumeBox <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①⓪">mdcv</a> and ContentLightLevelBox <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①①">clli</a> SHOULD be present, and their values SHALL match the values of contained in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46①">Metadata OBUs</a> of type METADATA_TYPE_HDR_CLL and METADATA_TYPE_HDR_MDCV, if present (in the configOBUs or in the samples).</p>
-   <p class="note" role="note"><span>NOTE:</span> The MasteringDisplayColourVolumeBox <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①②">mdcv</a> and ContentLightLevelBox <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①③">clli</a> have identical syntax to the SMPTE2086MasteringDisplayMetadataBox <a class="property" data-link-type="propdesc" href="https://www.webmproject.org/vp9/mp4/#" id="termref-for-①④">SmDm</a> and ContentLightLevelBox <a class="property" data-link-type="propdesc" href="https://www.webmproject.org/vp9/mp4/#" id="termref-for-①⑤">CoLL</a>, except that they are of type <code>Box</code> and not <code>FullBox</code>. However, the semantics of the MasteringDisplayColourVolumeBox and SMPTE2086MasteringDisplayMetadataBox have important differences and should not be confused.</p>
-   <p>Additional boxes may be provided at the end of the <a data-link-type="dfn" href="https://www.iso.org/standard/68960.html#" id="termref-for-①⑥">VisualSampleEntry</a> as permitted by ISOBMFF, that may represent redundant or similar information to the one provided in some OBUs contained in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox" id="ref-for-av1codecconfigurationbox⑤">AV1CodecConfigurationBox</a>. If the box definition does not indicate that its information overrides the OBU information, in case of conflict, the OBU information should be considered authoritative.</p>
-   <h3 class="heading settled" data-level="2.4" id="sampleformat"><span class="secno">2.4. </span><span class="content">AV1 Sample Format</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#sampleformat"></a></h3>
-   <p>For tracks using the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry" id="ref-for-av1sampleentry②">AV1SampleEntry</a>, an <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1-sample">AV1 Sample</dfn> has the following constraints:</p>
-   <ul>
-    <li data-md="">
-     <p>the sample data SHALL be a sequence of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39②">OBUs</a> forming a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑤">Temporal Unit</a>,</p>
-    </li><li data-md="">
-     <p>each OBU SHALL follow the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②①">open_bitstream_unit</a> <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39" id="ref-for-page=39③">Low Overhead Bitstream Format</a> syntax as specified in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a>. Each OBU SHALL have the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②②">obu_has_size_field</a> set to 1 except for the last OBU in the sample, for which <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②③">obu_has_size_field</a> MAY be set to 0, in which case it is assumed to fill the remainder of the sample,</p>
-   </li></ul>
-   <p class="note" role="note"><span>NOTE:</span> When extracting OBUs from an ISOBMFF file, and depending on the capabilities of the decoder processing these OBUs, ISOBMFF parsers MAY need to either: set the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②④">obu_has_size_field</a> to 1 for some OBUs if not already set, add the size field in this case, and add <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46②">Temporal Delimiter OBU</a>; or use the length-delimited bitstream format as defined in Annex B of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1s" id="ref-for-av1s">AV1</a>. If encryption is used, similar operations MAY have to be done before or after decryption depending on the demuxer/decryptor/decoder architecture.</p>
-   <ul>
-    <li data-md="">
-     <p>OBU trailing bits SHOULD be limited to byte alignment and SHOULD not be used for padding,</p>
-    </li><li data-md="">
-     <p>OBUs of type OBU_TEMPORAL_DELIMITER, OBU_PADDING, or OBU_REDUNDANT_FRAME_HEADER SHOULD NOT be used.</p>
-    </li><li data-md="">
-     <p>OBUs of type OBU_TILE_LIST SHALL NOT be used.</p>
-   </li></ul>
-   <p>If an AV1 Sample is signaled as a sync sample (in the SyncSampleBox or by setting sample_is_non_sync_sample to 0), it SHALL be a Random Access Point as defined in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a>, i.e. satisfy the following constraints:</p>
-   <ul>
-    <li data-md="">
-     <p>Its first frame is a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑥">Key Frame</a> that has <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑤">show_frame</a> flag set to 1,</p>
-    </li><li data-md="">
-     <p>It contains a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑥">Sequence Header OBU</a> before the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49①">Frame Header OBU</a>.</p>
-   </li></ul>
-   <p class="note" role="note"><span>NOTE:</span> Within this definition, a sync sample may contain additional frames that are not Key Frames. The fact that none of them is the first frame in the temporal unit ensures that they are decodable.</p>
-   <p class="note" role="note"><span>NOTE:</span> Other types of OBUs such as <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46③">metadata OBUs</a> could be present before the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑦">Sequence Header OBU</a>.</p>
-   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑦">Intra-only frames</a> SHOULD be signaled using the sample_depends_on flag set to 2.</p>
-   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑦">Delayed Random Access Points</a> SHOULD be signaled using sample groups and the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1forwardkeyframesamplegroupentry" id="ref-for-av1forwardkeyframesamplegroupentry①">AV1ForwardKeyFrameSampleGroupEntry</a>.</p>
-   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑧">Switch Frames</a> SHOULD be signaled using sample groups and the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1switchframesamplegroupentry" id="ref-for-av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</a>.</p>
-   <p>Additionally, if a file contains multiple tracks that are alternative representations of the same content, in particular using <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13⑨">Switch Frames</a>, those tracks SHOULD be marked as belonging to the same alternate group and should use a track selection box with an appropriate attribute (e.g. <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①⑦">bitr</a>).</p>
-   <p>In tracks using the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry" id="ref-for-av1sampleentry③">AV1SampleEntry</a>, the <a class="property" data-link-type="propdesc" href="https://www.iso.org/standard/68960.html#" id="termref-for-①⑧">ctts</a> box and composition offsets in movie fragments SHALL NOT be used. Similarly, the is_leading flag, if used, SHALL be set to 0 or 2.</p>
-   <p>When a temporal unit contains more than one frame, the sample corresponding to that temporal unit MAY be marked using the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1multiframesamplegroupentry" id="ref-for-av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</a>.</p>
-   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46④">Metadata OBUs</a> may be carried in sample data. In this case, the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1metadatasamplegroupentry" id="ref-for-av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</a> SHOULD be used. If the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑤">metadata OBUs</a> are static for the entire set of samples associated with a given sample description entry, they SHOULD also be in the OBU array in the sample description entry.</p>
-   <p>Unless explicitely stated, the grouping_type_parameter is not defined for the SampleToGroupBox with grouping types defined in this specification.</p>
-   <h3 class="heading settled" data-level="2.5" id="forwardkeyframesamplegroupentry"><span class="secno">2.5. </span><span class="content">AV1 Forward Key Frame sample group entry</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry"></a></h3>
-   <h4 class="heading settled" data-level="2.5.1" id="forwardkeyframesamplegroupentry-definition"><span class="secno">2.5.1. </span><span class="content">Definition</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-definition"></a></h4>
-<pre class="def">Group Type: <dfn data-dfn-type="dfn" data-export="" id="av1f">av1f<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#av1f"></a></dfn>
-Container:  Sample Group Description Box ('sgpd')
-Mandatory:  No
-Quantity:   Zero or more.
-</pre>
-   <h4 class="heading settled" data-level="2.5.2" id="forwardkeyframesamplegroupentry-description"><span class="secno">2.5.2. </span><span class="content">Description</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-description"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</dfn> documents samples that contain a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑧">Delayed Random Access Point</a> that are followed at a given distance in the bitstream by a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206⑨">Key Frame Dependent Recovery Point</a>.</p>
-   <h4 class="heading settled" data-level="2.5.3" id="forwardkeyframesamplegroupentry-syntax"><span class="secno">2.5.3. </span><span class="content">Syntax</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-syntax"></a></h4>
-<pre>class AV1ForwardKeyFrameSampleGroupEntry extends VisualSampleGroupEntry('av1f') {
-  unsigned int(8) fwd_distance;
-}
-</pre>
-   <h4 class="heading settled" data-level="2.5.4" id="forwardkeyframesamplegroupentry-semantics"><span class="secno">2.5.4. </span><span class="content">Semantics</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#forwardkeyframesamplegroupentry-semantics"></a></h4>
-   <p>The <dfn data-dfn-type="dfn" data-export="" id="fwd_distance">fwd_distance<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#fwd_distance"></a></dfn> field indicates the number of samples between this sample and the next sample containing the associated <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206" id="ref-for-page=206①⓪">Key Frame Dependent Recovery Point</a>. 0 means the next sample.</p>
-   <h3 class="heading settled" data-level="2.6" id="multiframesamplegroupentry"><span class="secno">2.6. </span><span class="content">AV1 Multi-Frame sample group entry</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry"></a></h3>
-   <h4 class="heading settled" data-level="2.6.1" id="multiframesamplegroupentry-definition"><span class="secno">2.6.1. </span><span class="content">Definition</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry-definition"></a></h4>
-<pre class="def">Group Type: <dfn data-dfn-for="AV1MultiFrameSampleGroupEntry" data-dfn-type="value" data-export="" id="valdef-av1multiframesamplegroupentry-av1m">av1m<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#valdef-av1multiframesamplegroupentry-av1m"></a></dfn>
-Container:  Sample Group Description Box ('sgpd')
-Mandatory:  No
-Quantity:   Zero or more.
-</pre>
-   <h4 class="heading settled" data-level="2.6.2" id="multiframesamplegroupentry-description"><span class="secno">2.6.2. </span><span class="content">Description</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry-description"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</dfn> documents samples that contain multiple frames.</p>
-   <h4 class="heading settled" data-level="2.6.3" id="multiframesamplegroupentry-syntax"><span class="secno">2.6.3. </span><span class="content">Syntax</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#multiframesamplegroupentry-syntax"></a></h4>
-<pre>class AV1MultiFrameSampleGroupEntry extends VisualSampleGroupEntry('av1m') {
-}
-</pre>
-   <h3 class="heading settled" data-level="2.7" id="switchframesamplegroupentry"><span class="secno">2.7. </span><span class="content">AV1 Switch Frame sample group entry</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry"></a></h3>
-   <h4 class="heading settled" data-level="2.7.1" id="switchframesamplegroupentry-definition"><span class="secno">2.7.1. </span><span class="content">Definition</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry-definition"></a></h4>
-<pre class="def">Group Type: <dfn class="dfn-paneled" data-dfn-type="dfn" data-export="" id="av1s">av1s</dfn>
-Container:  Sample Group Description Box ('sgpd')
-Mandatory:  No
-Quantity:   Zero or more.
-</pre>
-   <h4 class="heading settled" data-level="2.7.2" id="switchframesamplegroupentry-description"><span class="secno">2.7.2. </span><span class="content">Description</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry-description"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</dfn> documents samples that start with a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13" id="ref-for-page=13①⓪">Switch Frame</a>.</p>
-   <h4 class="heading settled" data-level="2.7.3" id="switchframesamplegroupentry-syntax"><span class="secno">2.7.3. </span><span class="content">Syntax</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#switchframesamplegroupentry-syntax"></a></h4>
-<pre>class AV1SwitchFrameSampleGroupEntry extends VisualSampleGroupEntry('av1s') {
-}
-</pre>
-   <h3 class="heading settled" data-level="2.8" id="metadatasamplegroupentry"><span class="secno">2.8. </span><span class="content">AV1 Metadata sample group entry</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry"></a></h3>
-   <h4 class="heading settled" data-level="2.8.1" id="metadatasamplegroupentry-definition"><span class="secno">2.8.1. </span><span class="content">Definition</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-definition"></a></h4>
-<pre class="def">Group Type: <dfn data-dfn-for="AV1MetadataSampleGroupEntry" data-dfn-type="value" data-noexport="" id="valdef-av1metadatasamplegroupentry-av1m">av1M<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#valdef-av1metadatasamplegroupentry-av1m"></a></dfn>
-Container:  Sample Group Description Box ('sgpd')
-Mandatory:  No
-Quantity:   Zero or more.
-</pre>
-   <h4 class="heading settled" data-level="2.8.2" id="metadatasamplegroupentry-description"><span class="secno">2.8.2. </span><span class="content">Description</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-description"></a></h4>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</dfn> documents samples that contain <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑥">metadata OBUs</a>. The <code>grouping_type_parameter</code> can be used to identify samples containing <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑦">metadata OBUs</a> of a given type. If no <code>grouping_type_parameter</code> is provided, the sample group entry identifies samples containing <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑧">metadata OBUs</a> for which the <code>metadata_type</code> is unknown.</p>
-   <h4 class="heading settled" data-level="2.8.3" id="metadatasamplegroupentry-syntax"><span class="secno">2.8.3. </span><span class="content">Syntax</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-syntax"></a></h4>
-<pre>class AV1MetadataSampleGroupEntry extends VisualSampleGroupEntry('av1M') {
-}
-</pre>
-   <p>For this sample group entry, the <code>grouping_type_parameter</code> syntax is as follows:</p>
-<pre>{
-   unsigned int (8) metadata_type;
-   unsigned int (24) metadata_specific_parameters;
-}
-</pre>
-   <h4 class="heading settled" data-level="2.8.4" id="metadatasamplegroupentry-semantics"><span class="secno">2.8.4. </span><span class="content">Semantics</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadatasamplegroupentry-semantics"></a></h4>
-   <p><dfn data-dfn-type="dfn" data-export="" id="metadata_type">metadata_type<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadata_type"></a></dfn> is a 8-bit field whose value is the value of the metadata_type field defined in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a>, when it is equal or lower than 255. metadata_type values above 255 are not supported by this sample group.</p>
-   <p><dfn data-dfn-type="dfn" data-export="" id="metadata_specific_parameters">metadata_specific_parameters<a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#metadata_specific_parameters"></a></dfn> provides an additional part of the <code>grouping_type_parameter</code>, which MAY be used to distinguish different sample groups having the same <code>metadata_type</code> but different sub-parameters. In this version of the specification, <code>metadata_specific_parameters</code> is only defined when <code>metadata_type</code> is set to <code>METADATA_TYPE_ITUT_T35</code> in which case its value SHALL be set to the first 24 bits of the <code>metadata_itut_t35</code> structure. For other types of metadata, its value SHOULD be set to 0. In all cases, when the <code>grouping_type_parameter</code> is used, readers processing sample groups SHALL use the entire value of <code>grouping_type_parameter</code>.</p>
-   <h2 class="heading settled" data-level="3" id="cmaf"><span class="secno">3. </span><span class="content">CMAF AV1 track format</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#cmaf"></a></h2>
-   <p><a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cmaf">[CMAF]</a> defines structural constraints on ISOBMFF files additional to <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-isobmff">[ISOBMFF]</a> for the purpose of, for example, adaptive streaming or for protected files. Conformance to these structural constraints is signaled by the presence of the brand <code><a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="termref-for-①⑨">cmfc</a></code> in the <code>FileTypeBox</code>.</p>
-   <p>If a <a data-link-type="dfn" href="https://www.iso.org/standard/71975.html#" id="termref-for-②⓪">CMAF Video Track</a> uses the brand <code>av01</code>, it is called a <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport="" id="cmaf-av1-track">CMAF AV1 Track</dfn> and the following constraints, defining the CMAF Media Profile for AV1, apply:</p>
-   <ul>
-    <li data-md="">
-     <p>it SHALL use an <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry" id="ref-for-av1sampleentry④">AV1SampleEntry</a></p>
-    </li><li data-md="">
-     <p>it MAY use multiple sample entries, and in that case the following values SHALL not change in the track:</p>
-     <ul>
-      <li data-md="">
-       <p><code>seq_profile</code></p>
-      </li><li data-md="">
-       <p><code>still_picture</code></p>
-      </li><li data-md="">
-       <p>the first value of <code>seq_level_idx</code></p>
-      </li><li data-md="">
-       <p>the first value of <code>seq_tier</code></p>
-      </li><li data-md="">
-       <p><code>color_config</code></p>
-      </li><li data-md="">
-       <p><code>initial_presentation_delay_minus_one</code></p>
-     </li></ul>
-   </li></ul>
-   <p>When protected, <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#cmaf-av1-track" id="ref-for-cmaf-av1-track">CMAF AV1 Tracks</a> SHALL use the signaling defined in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cmaf">[CMAF]</a>, which in turn relies on <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cenc">[CENC]</a>, with the provisions specified in <a href="https://aomediacodec.github.io/av1-isobmff/#CommonEncryption">§ 4 Common Encryption</a>.</p>
-   <h2 class="heading settled" data-level="4" id="CommonEncryption"><span class="secno">4. </span><span class="content">Common Encryption</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#CommonEncryption"></a></h2>
-   <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-isobmff/#cmaf-av1-track" id="ref-for-cmaf-av1-track①">CMAF AV1 Tracks</a> and non-segmented AV1 files MAY be protected. If protected, they SHALL conform to <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cenc">[CENC]</a>. Files SHOULD be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②①">cbcs</a></code> protection scheme and MAY be protected using the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②②">cenc</a></code> protection scheme.</p>
-   <p>When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②③">cenc</a></code> is used, samples SHALL be protected using subsample encryption and SHALL NOT use pattern encryption.</p>
-   <p>When the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②④">cbcs</a></code> is used, samples SHALL be protected using subsample encryption and SHALL use pattern encryption. <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cenc">[CENC]</a> recommends that the Block Pattern length be 10, i.e. <code>crypt_byte_block + skip_byte_block = 10</code>, where a Block is of size 16-bytes. In this specification, the combination of <code>crypt_byte_block</code> and <code>skip_byte_block</code> SHALL be one of the following, with the first one being recommended:</p>
-   <ul>
-    <li data-md="">
-     <p><code>crypt_byte_block = 1</code> and <code>skip_byte_block = 9</code>,</p>
-    </li><li data-md="">
-     <p><code>crypt_byte_block = 5</code> and <code>skip_byte_block = 5</code>,</p>
-    </li><li data-md="">
-     <p><code>crypt_byte_block = 10</code> and <code>skip_byte_block = 0</code>.</p>
-   </li></ul>
-   <h3 class="heading settled" data-level="4.1" id="subsample-encryption"><span class="secno">4.1. </span><span class="content">General Subsample Encryption constraints</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#subsample-encryption"></a></h3>
-   <p>Within protected samples, the following constraints apply:</p>
-   <ul>
-    <li data-md="">
-     <p>Protected samples SHALL be exactly spanned by one or more contiguous subsamples.</p>
-     <ul>
-      <li data-md="">
-       <p>An OBU MAY be spanned by one or more subsamples, especially when it has multiple ranges of protected data. However, as recommended in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cenc">[CENC]</a>, writers SHOULD reduce the number of subsamples as possible. This can be achieved by using a subsample that spans multiple consecutive unprotected OBUs as well as the first unprotected and protected parts of the following protected OBU, if such protected OBU exists.</p>
-      </li><li data-md="">
-       <p>A large unprotected OBU whose data size is larger than the maximum size of a single <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②⑤">BytesOfClearData</a> field MAY be spanned by multiple subsamples with zero size <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②⑥">BytesOfProtectedData</a>.</p>
-     </li></ul>
-    </li><li data-md="">
-     <p>All <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40" id="ref-for-page=40①">OBU Headers</a> and associated <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑥">obu_size</a> fields SHALL be unprotected.</p>
-    </li><li data-md="">
-     <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46⑨">Temporal Delimiter OBUs</a>, <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑧">Sequence Header OBUs</a>, and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49" id="ref-for-page=49②">Frame Header OBUs</a> (including within a <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71">Frame OBU</a>), <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121①">Redundant Frame Header OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121" id="ref-for-page=121②">Padding OBUs</a> SHALL be unprotected.</p>
-    </li><li data-md="">
-     <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46" id="ref-for-page=46①⓪">Metadata OBUs</a> MAY be protected.</p>
-    </li><li data-md="">
-     <p><a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71①">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71②">Frame OBUs</a> SHALL be protected. Within <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71③">Tile Group OBUs</a> or <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71④">Frame OBUs</a>, the following applies:</p>
-     <ul>
-      <li data-md="">
-       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②⑦">cbcs</a></code>:</p>
-       <ul>
-        <li data-md="">
-         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②⑧">BytesOfProtectedData</a> SHALL start on the first byte and end on the last byte of the <code>decode_tile</code> structure (including any trailing bits).</p>
-       </li></ul>
-       <p class="note" role="note"><span>NOTE:</span> As a result of the above, <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-②⑨">BytesOfProtectedData</a> is not necessarily a multiple of 16 bytes and partial blocks are included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③⓪">BytesOfProtectedData</a> range, but per <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-cenc">[CENC]</a> the data is not be encrypted.</p>
-       <ul>
-        <li data-md="">
-         <p>A subsample SHALL be created for each tile, even if its size is less than 16 bytes.</p>
-        </li><li data-md="">
-         <p>All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑤">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑥">Frame OBUs</a> SHALL be unprotected.</p>
-       </li></ul>
-      </li><li data-md="">
-       <p>for the protected scheme <code><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③①">cenc</a></code>:</p>
-       <ul>
-        <li data-md="">
-         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③②">BytesOfProtectedData</a> SHALL be a multiple of 16 bytes.</p>
-        </li><li data-md="">
-         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③③">BytesOfProtectedData</a> SHALL end on the last byte of the <code>decode_tile</code> structure (including any trailing bits).</p>
-        </li><li data-md="">
-         <p><a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③④">BytesOfProtectedData</a> SHALL span all complete 16-byte blocks of the <code>decode_tile</code> structure (including any trailing bits).</p>
-       </li></ul>
-       <p class="note" role="note"><span>NOTE:</span> As a result of the above, partial blocks are not used and it is possible that <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③⑤">BytesOfProtectedData</a> does not start at the first byte of the <code>decode_tile</code> structure, but some number of bytes following that.</p>
-       <ul>
-        <li data-md="">
-         <p>A subsample SHALL be created for each tile that has a <code>decode_tile</code> structure whose size (including any trailing bits) is larger or equal to 16 bytes. If it is less than 16 bytes, per the rules above, the <code>decode_tile</code> structure is not encrypted and the corresponding bytes SHOULD be included in the <a data-link-type="dfn" href="https://www.iso.org/standard/68042.html#" id="termref-for-③⑥">BytesOfClearData</a> field of a surrounding subsample, if any.</p>
-        </li><li data-md="">
-         <p>All other parts of <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑦">Tile Group OBUs</a> and <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71" id="ref-for-page=71⑧">Frame OBUs</a> SHALL be unprotected.</p>
-       </li></ul>
-     </li></ul>
-   </li></ul>
-   <h3 class="heading settled" data-level="4.2" id="subsample-encryption-illustration"><span class="secno">4.2. </span><span class="content">Subsample Encryption Illustration</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#subsample-encryption-illustration"></a></h3>
-    Figure #1 illustrates Subsample based encryption of AV1. 
-   <figure>
-     <img alt="Subsample-based AV1 encryption" src="./v1.2.0_files/subsample_encryption.svg"> 
-    <figcaption>Subsample-based AV1 encryption.</figcaption>
-   </figure>
-   <h2 class="heading settled" data-level="5" id="codecsparam"><span class="secno">5. </span><span class="content">Codecs Parameter String</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#codecsparam"></a></h2>
-   <p>DASH and other applications require defined values for the <a class="property" data-link-type="propdesc" href="https://tools.ietf.org/html/rfc6381#" id="termref-for-③⑦">Codecs</a> parameter specified in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-rfc6381">[RFC6381]</a> for ISO Media tracks. The codecs parameter string for the AOM AV1 codec is as follows:</p>
-<pre>&lt;sample entry 4CC&gt;.&lt;profile&gt;.&lt;level&gt;&lt;tier&gt;.&lt;bitDepth&gt;.&lt;monochrome&gt;.&lt;chromaSubsampling&gt;.
-&lt;colorPrimaries&gt;.&lt;transferCharacteristics&gt;.&lt;matrixCoefficients&gt;.&lt;videoFullRangeFlag&gt;
-</pre>
-   <p>All fields following the sample entry 4CC are expressed as double digit decimals, unless indicated otherwise. Leading or trailing zeros cannot be omitted.</p>
-   <p>The profile parameter value, represented by a single digit decimal, SHALL equal the value of seq_profile in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41②⑨">Sequence Header OBU</a>.</p>
-   <p>The level parameter value SHALL equal the first level value indicated by <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑦">seq_level_idx</a> in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③⓪">Sequence Header OBU</a>.</p>
-   <p>The tier parameter value SHALL be equal to <code>M</code> when the first <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2" id="ref-for-page=2②⑧">seq_tier</a> value in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③①">Sequence Header OBU</a> is equal to 0, and <code>H</code> when it is equal to 1.</p>
-   <p>The bitDepth parameter value SHALL equal the value of BitDepth variable as defined in <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-av1">[AV1]</a> derived from the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③②">Sequence Header OBU</a>.</p>
-   <p>The monochrome parameter value, represented by a single digit decimal, SHALL equal the value of mono_chrome in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③③">Sequence Header OBU</a>.</p>
-   <p>The chromaSubsampling parameter value, represented by a three-digit decimal, SHALL have its first digit equal to subsampling_x and its second digit equal to subsampling_y. If both subsampling_x and subsampling_y are set to 1, then the third digit SHALL be equal to chroma_sample_position, otherwise it SHALL be set to 0.</p>
-   <p>The colorPrimaries, transferCharacteristics, matrixCoefficients, and videoFullRangeFlag parameter values SHALL equal the value of matching fields in the <a data-link-type="dfn" href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41" id="ref-for-page=41③④">Sequence Header OBU</a>, if color_description_present_flag is set to 1, otherwise they SHOULD not be set, defaulting to the values below. The videoFullRangeFlag is represented by a single digit.</p>
-   <p>For example, codecs="av01.0.04M.10.0.112.09.16.09.0" represents AV1 Main Profile, level 3.0, Main tier, 10-bit content, non-monochrome, with 4:2:0 chroma subsampling co-located with (0, 0) luma sample, ITU-R BT.2100 color primaries, ITU-R BT.2100 PQ transfer characteristics, ITU-R BT.2100 YCbCr color matrix, and studio swing representation.</p>
-   <p>The parameters sample entry 4CC, profile, level, tier, and bitDepth are all mandatory fields. If any of these fields are empty, or not within their allowed range, the processing device SHOULD treat it as an error.</p>
-   <p>All the other fields (including their leading '.') are optional, mutually inclusive (all or none) fields. If not specified then the values listed in the table below are assumed.</p>
-   <table class="def">
-    <tbody>
-     <tr>
-      <td>mono_chrome
-      </td><td>0
-     </td></tr><tr>
-      <td>chromaSubsampling
-      </td><td>110 (4:2:0)
-     </td></tr><tr>
-      <td>colorPrimaries
-      </td><td>1 (ITU-R BT.709)
-     </td></tr><tr>
-      <td>transferCharacteristics
-      </td><td>1 (ITU-R BT.709)
-     </td></tr><tr>
-      <td>matrixCoefficients
-      </td><td>1 (ITU-R BT.709)
-     </td></tr><tr>
-      <td>videoFullRangeFlag
-      </td><td>0 (studio swing representation)
-   </td></tr></tbody></table>
-   <p>The string codecs="av01.0.01M.08" in this case would represent AV1 Main Profile, level 2.1, Main tier, 8-bit content with 4:2:0 chroma subsampling, ITU-R BT.709 color primaries, transfer characteristics, matrix coefficients, and studio swing representation.</p>
-   <p>If any character that is not '.', digits, part of the AV1 4CC, or a tier value is encountered, the string SHALL be interpreted ignoring all the characters starting from that character.</p>
-   <h2 class="heading settled" data-level="6" id="changelist"><span class="secno">6. </span><span class="content">Changes since v1.1.0 release</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#changelist"></a></h2>
-   <ul>
-    <li data-md="">
-     <p><a href="https://github.com/AOMediaCodec/av1-isobmff/pull/116"> Change tile/subsample alignement for the <code>cbcs</code> protection scheme.</a></p>
-   </li></ul>
-  </main>
-  <div data-fill-with="conformance">
-   <h2 class="no-ref no-num heading settled" id="conformance"><span class="content"> Conformance</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#conformance"></a></h2>
-   <p> Conformance requirements are expressed with a combination of descriptive assertions and RFC 2119 terminology.
-            The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL”
-            in the normative parts of this document
-            are to be interpreted as described in RFC 2119.
-            However, for readability,
-            these words do not appear in all uppercase letters in this specification. </p>
-   <p> All of the text of this specification is normative
-            except sections explicitly marked as non-normative, examples, and notes. <a data-link-type="biblio" href="https://aomediacodec.github.io/av1-isobmff/#biblio-rfc2119">[RFC2119]</a> </p>
-   <p> Examples in this specification are introduced with the words “for example”
-            or are set apart from the normative text with <code>class="example"</code>, like this: </p>
-   <div class="example" id="example-example"><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#example-example"></a> This is an example of an informative example. </div>
-   <p> Informative notes begin with the word “Note”
-            and are set apart from the normative text with <code>class="note"</code>, like this: </p>
-   <p class="note" role="note"> Note, this is an informative note. </p>
-  </div>
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-                          + '<span>Pop Out Sidebar</span>';
-  var tocJumpText         = '<span aria-hidden="true">↑</span> '
-                          + '<span>Jump to Table of Contents</span>';
-
-  var sidebarMedia = window.matchMedia('screen and (min-width: 78em)');
-  var autoToggle   = function(e){ toggleSidebar(e.matches) };
-  if(sidebarMedia.addListener) {
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-    if (on == undefined) {
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-    var skipScroll = window.scrollY < headY;
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-    var tocNav = document.getElementById('toc');
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-      document.body.classList.add('toc-sidebar');
-      document.body.classList.remove('toc-inline');
-      toggle.innerHTML = collapseSidebarText;
-      if (!skipScroll) {
-        window.scrollBy(0, 0 - tocHeight);
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-      tocNav.focus();
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-    /* Create the sidebar toggle in JS; it shouldn’t exist when JS is off. */
-    var toggle = document.createElement('a');
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-    if (!tocNav) {
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-      tocNav.id = 'toc-nav';
-      /* Prepend for better keyboard navigation */
-      document.body.insertBefore(tocNav, document.body.firstChild);
-    }
-    /* While we’re at it, make sure we have a Jump to Toc link. */
-    var tocJump = document.getElementById('toc-jump');
-    if (!tocJump) {
-      tocJump = document.createElement('a');
-      tocJump.id = 'toc-jump';
-      tocJump.href = '#toc';
-      tocJump.innerHTML = tocJumpText;
-      tocNav.appendChild(tocJump);
-    }
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-  var toc = document.getElementById('toc');
-  if (toc) {
-    createSidebarToggle();
-    toggleSidebar(sidebarMedia.matches);
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-       (window too small for the MQ to add the margin to body),
-       then auto-close the sidebar once you click on something in there. */
-    toc.addEventListener('click', function(e) {
-      if(e.target.tagName.toLowerCase() == "a" && document.body.classList.contains('toc-sidebar') && !sidebarMedia.matches) {
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-    console.warn("Can’t find Table of Contents. Please use <nav id='toc'> around the ToC.");
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-</script>
-  <h2 class="no-num no-ref heading settled" id="index"><span class="content">Index</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#index"></a></h2>
-  <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="content">Terms defined by this specification</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#index-defined-here"></a></h3>
-  <ul class="index">
-   <li>
-    av01
-    <ul>
-     <li><a href="https://aomediacodec.github.io/av1-isobmff/#valdef-av1sampleentry-av01">value for AV1SampleEntry</a><span>, in § 2.2.1</span>
-     </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#valdef-isobmff-brand-av01">value for ISOBMFF Brand</a><span>, in § 2.1</span>
-    </li></ul>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1c">av1C</a><span>, in § 2.3.1</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox">AV1CodecConfigurationBox</a><span>, in § 2.3.2</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1f">av1f</a><span>, in § 2.5.1</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1forwardkeyframesamplegroupentry">AV1ForwardKeyFrameSampleGroupEntry</a><span>, in § 2.5.2</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#valdef-av1metadatasamplegroupentry-av1m">av1M</a><span>, in § 2.8.1</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#valdef-av1multiframesamplegroupentry-av1m">av1m</a><span>, in § 2.6.1</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1metadatasamplegroupentry">AV1MetadataSampleGroupEntry</a><span>, in § 2.8.2</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1multiframesamplegroupentry">AV1MultiFrameSampleGroupEntry</a><span>, in § 2.6.2</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1s">av1s</a><span>, in § 2.7.1</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1-sample">AV1 Sample</a><span>, in § 2.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry">AV1SampleEntry</a><span>, in § 2.2.2</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#av1switchframesamplegroupentry">AV1SwitchFrameSampleGroupEntry</a><span>, in § 2.7.2</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#chroma_sample_position">chroma_sample_position</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#chroma_subsampling_x">chroma_subsampling_x</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#chroma_subsampling_y">chroma_subsampling_y</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#cmaf-av1-track">CMAF AV1 Track</a><span>, in § 3</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#compressorname">compressorname</a><span>, in § 2.2.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#config">config</a><span>, in § 2.2.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#configobus">configOBUs</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#fwd_distance">fwd_distance</a><span>, in § 2.5.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#height">height</a><span>, in § 2.2.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#high_bitdepth">high_bitdepth</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_minus_one">initial_presentation_delay_minus_one</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_present">initial_presentation_delay_present</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#marker">marker</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#metadata_specific_parameters">metadata_specific_parameters</a><span>, in § 2.8.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#metadata_type">metadata_type</a><span>, in § 2.8.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#monochrome">monochrome</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#seq_level_idx_0">seq_level_idx_0</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#seq_profile">seq_profile</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#seq_tier_0">seq_tier_0</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#twelve_bit">twelve_bit</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#version">version</a><span>, in § 2.3.4</span>
-   </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#width">width</a><span>, in § 2.2.4</span>
-  </li></ul>
-  <aside class="dfn-panel" data-for="term-for-page=1">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=1</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=1">1. Bitstream features overview</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=1%E2%91%A0">2. Basic Encapsulation Scheme</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=44">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=44</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=44">2.3.4. Semantics</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=206">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A3">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A4">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A5">(7)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A6">2.4. AV1 Sample Format</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A7">2.5.2. Description</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A8">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A0%E2%93%AA">2.5.4. Semantics</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=49">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=49</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=49">2.3.4. Semantics</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=49%E2%91%A0">2.4. AV1 Sample Format</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=49%E2%91%A1">4.1. General Subsample Encryption constraints</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=71">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A3">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A4">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A5">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A6">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A7">(9)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=13">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A3">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A4">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A5">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A6">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A7">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A8">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0%E2%93%AA">2.7.2. Description</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=13">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A3">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A4">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A5">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A6">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A7">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A8">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0%E2%93%AA">2.7.2. Description</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=13">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A3">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A4">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A5">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A6">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A7">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A8">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0%E2%93%AA">2.7.2. Description</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=206">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A3">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A4">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A5">(7)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A6">2.4. AV1 Sample Format</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A7">2.5.2. Description</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A8">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A0%E2%93%AA">2.5.4. Semantics</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=39">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39">1. Bitstream features overview</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39%E2%91%A0">2.3.4. Semantics</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39%E2%91%A1">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39%E2%91%A2">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=46">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A0">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A1">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A2">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A3">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A4">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A5">2.8.2. Description</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A6">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A7">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A8">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A0%E2%93%AA">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=39">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=39</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39">1. Bitstream features overview</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39%E2%91%A0">2.3.4. Semantics</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39%E2%91%A1">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=39%E2%91%A2">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=40">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=40</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=40">2.3.4. Semantics</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=40%E2%91%A0">4.1. General Subsample Encryption constraints</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=121">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121">1. Bitstream features overview</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121%E2%91%A0">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121%E2%91%A1">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=206">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=206</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A3">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A4">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A5">(7)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A6">2.4. AV1 Sample Format</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A7">2.5.2. Description</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A8">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=206%E2%91%A0%E2%93%AA">2.5.4. Semantics</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=121">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121">1. Bitstream features overview</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121%E2%91%A0">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121%E2%91%A1">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=41">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=41</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A2">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A3">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A4">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A5">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A6">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A7">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A8">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%93%AA">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A0">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A1">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A2">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A3">(13)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A4">(14)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A5">(15)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A6">(16)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A7">(17)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A0%E2%91%A8">(18)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%93%AA">(19)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A0">(20)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A1">(21)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A2">(22)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A3">(23)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A4">(24)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A5">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A6">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A7">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A1%E2%91%A8">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A2%E2%93%AA">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A2%E2%91%A0">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A2%E2%91%A1">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A2%E2%91%A2">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=41%E2%91%A2%E2%91%A3">(6)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=13">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A3">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A4">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A5">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A6">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A7">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A8">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0%E2%93%AA">2.7.2. Description</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=46">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=46</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A0">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A1">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A2">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A3">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A4">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A5">2.8.2. Description</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A6">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A7">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A8">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=46%E2%91%A0%E2%93%AA">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=13">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=13</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A3">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A4">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A5">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A6">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A7">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A8">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=13%E2%91%A0%E2%93%AA">2.7.2. Description</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=71">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=71</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A2">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A3">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A4">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A5">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A6">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=71%E2%91%A7">(9)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=121">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=121</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121">1. Bitstream features overview</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121%E2%91%A0">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=121%E2%91%A1">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=45">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=45</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=45">2.3.4. Semantics</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-page=2">
-   <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2">https://aomediacodec.github.io/av1-spec/av1-spec.pdf#page=2</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2">1. Bitstream features overview</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A2">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A3">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A4">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A5">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A6">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A7">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A8">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%93%AA">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A0">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A1">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A2">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A3">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A4">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A5">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A6">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A7">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A0%E2%91%A8">(12)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%93%AA">(13)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A0">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A1">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A2">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A3">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A4">(5)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A5">4.1. General Subsample Encryption constraints</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A6">5. Codecs Parameter String</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-page=2%E2%91%A1%E2%91%A7">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4. Common Encryption</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(12)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4. Common Encryption</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(12)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4. Common Encryption</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(12)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68042.html#">https://www.iso.org/standard/68042.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4. Common Encryption</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">4.1. General Subsample Encryption constraints</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(11)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(12)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/71975.html#">https://www.iso.org/standard/71975.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">3. CMAF AV1 track format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/71975.html#">https://www.iso.org/standard/71975.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">3. CMAF AV1 track format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.iso.org/standard/68960.html#">https://www.iso.org/standard/68960.html#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.1. General Requirements &amp; Brands</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(4)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(5)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(6)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(7)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(8)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(9)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(10)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://tools.ietf.org/html/rfc6381#">https://tools.ietf.org/html/rfc6381#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">5. Codecs Parameter String</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.webmproject.org/vp9/mp4/#">https://www.webmproject.org/vp9/mp4/#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="term-for-">
-   <a href="https://www.webmproject.org/vp9/mp4/#">https://www.webmproject.org/vp9/mp4/#</a><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#termref-for-">(2)</a>
-   </li></ul>
-  </aside>
-  <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span class="content">Terms defined by reference</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#index-defined-elsewhere"></a></h3>
-  <ul class="index">
-   <li>
-    <a data-link-type="biblio">[AV1]</a> defines the following terms:
-    <ul>
-     <li><span class="dfn-paneled" id="term-for-page=1">av1 bitstream</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2">buffer_removal_time</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=44">color_config</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=206">delayed random access point</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=49">frame header obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=71">frame obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2①">frame_presentation_time</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2②">initial_display_delay_minus_1</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=13">inter frame</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=13①">intra-only frame</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=13②">key frame</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=206①">key frame dependent recovery point</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=39">low overhead bitstream format</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2③">max_frame_height_minus_1</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2④">max_frame_width_minus_1</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=46">metadata obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2⑤">mono_chrome</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=39①">obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=40">obu header</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2⑥">obu_has_size_field</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2⑦">obu_size</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2⑧">open_bitstream_unit</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=121">padding obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=206②">random access point</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=121①">redundant frame header obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2⑨">seq_level_idx</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2①⓪">seq_tier</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=41">sequence header obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2①①">show_existing_frame</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2①②">show_frame</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2①③">subsampling_x</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2①④">subsampling_y</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=13③">switch frame</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=46①">temporal delimiter obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=13④">temporal unit</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=71①">tile group obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=121②">tile list obu</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=45">timing_info</span>
-     </li><li><span class="dfn-paneled" id="term-for-page=2①⑤">timing_info_present_flag</span>
-    </li></ul>
-   </li><li>
-    <a data-link-type="biblio">[CENC]</a> defines the following terms:
-    <ul>
-     <li><span class="dfn-paneled" id="term-for-">bytesofcleardata</span>
-     </li><li><span class="dfn-paneled" id="term-for-①">bytesofprotecteddata</span>
-     </li><li><span class="dfn-paneled" id="term-for-②">cbcs</span>
-     </li><li><span class="dfn-paneled" id="term-for-③">cenc</span>
-    </li></ul>
-   </li><li>
-    <a data-link-type="biblio">[CMAF]</a> defines the following terms:
-    <ul>
-     <li><span class="dfn-paneled" id="term-for-④">cmaf video track</span>
-     </li><li><span class="dfn-paneled" id="term-for-⑤">cmfc</span>
-    </li></ul>
-   </li><li>
-    <a data-link-type="biblio">[ISOBMFF]</a> defines the following terms:
-    <ul>
-     <li><span class="dfn-paneled" id="term-for-⑥">bitr</span>
-     </li><li><span class="dfn-paneled" id="term-for-⑦">clap</span>
-     </li><li><span class="dfn-paneled" id="term-for-⑧">clli</span>
-     </li><li><span class="dfn-paneled" id="term-for-⑨">colr</span>
-     </li><li><span class="dfn-paneled" id="term-for-①⓪">ctts</span>
-     </li><li><span class="dfn-paneled" id="term-for-①①">iso6</span>
-     </li><li><span class="dfn-paneled" id="term-for-①②">mdcv</span>
-     </li><li><span class="dfn-paneled" id="term-for-①③">nclx</span>
-     </li><li><span class="dfn-paneled" id="term-for-①④">visualsampleentry</span>
-    </li></ul>
-   </li><li>
-    <a data-link-type="biblio">[RFC6381]</a> defines the following terms:
-    <ul>
-     <li><span class="dfn-paneled" id="term-for-①⑤">codecs</span>
-    </li></ul>
-   </li><li>
-    <a data-link-type="biblio">[vp9]</a> defines the following terms:
-    <ul>
-     <li><span class="dfn-paneled" id="term-for-①⑥">coll</span>
-     </li><li><span class="dfn-paneled" id="term-for-①⑦">smdm</span>
-    </li></ul>
-  </li></ul>
-  <h2 class="no-num no-ref heading settled" id="references"><span class="content">References</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#references"></a></h2>
-  <h3 class="no-num no-ref heading settled" id="normative"><span class="content">Normative References</span><a class="self-link" href="https://aomediacodec.github.io/av1-isobmff/#normative"></a></h3>
-  <dl>
-   <dt id="biblio-av1">[AV1]
-   </dt><dd><a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf"><cite>AV1 Bitstream &amp; Decoding Process Specification</cite></a>. Standard. URL: <a href="https://aomediacodec.github.io/av1-spec/av1-spec.pdf">https://aomediacodec.github.io/av1-spec/av1-spec.pdf</a>
-   </dd><dt id="biblio-cenc">[CENC]
-   </dt><dd><a href="https://www.iso.org/standard/68042.html"><cite>Information technology — MPEG systems technologies — Part 7: Common encryption in ISO base media file format files</cite></a>. Standard. URL: <a href="https://www.iso.org/standard/68042.html">https://www.iso.org/standard/68042.html</a>
-   </dd><dt id="biblio-cmaf">[CMAF]
-   </dt><dd><a href="https://www.iso.org/standard/71975.html"><cite>Information technology — Multimedia application format (MPEG-A) — Part 19: Common media application format (CMAF) for segmented media</cite></a>. Standard. URL: <a href="https://www.iso.org/standard/71975.html">https://www.iso.org/standard/71975.html</a>
-   </dd><dt id="biblio-isobmff">[ISOBMFF]
-   </dt><dd><a href="http://standards.iso.org/ittf/PubliclyAvailableStandards/c068960_ISO_IEC_14496-12_2015.zip"><cite>Information technology — Coding of audio-visual objects — Part 12: ISO Base Media File Format</cite></a>. December 2015. International Standard. URL: <a href="http://standards.iso.org/ittf/PubliclyAvailableStandards/c068960_ISO_IEC_14496-12_2015.zip">http://standards.iso.org/ittf/PubliclyAvailableStandards/c068960_ISO_IEC_14496-12_2015.zip</a>
-   </dd><dt id="biblio-rfc2119">[RFC2119]
-   </dt><dd>S. Bradner. <a href="https://datatracker.ietf.org/doc/html/rfc2119"><cite>Key words for use in RFCs to Indicate Requirement Levels</cite></a>. March 1997. Best Current Practice. URL: <a href="https://datatracker.ietf.org/doc/html/rfc2119">https://datatracker.ietf.org/doc/html/rfc2119</a>
-   </dd><dt id="biblio-rfc6381">[RFC6381]
-   </dt><dd>R. Gellens; D. Singer; P. Frojdh. <a href="https://www.rfc-editor.org/rfc/rfc6381"><cite>The 'Codecs' and 'Profiles' Parameters for "Bucket" Media Types</cite></a>. August 2011. Proposed Standard. URL: <a href="https://www.rfc-editor.org/rfc/rfc6381">https://www.rfc-editor.org/rfc/rfc6381</a>
-  </dd></dl>
-  <aside class="dfn-panel" data-for="av1sampleentry">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1sampleentry">#av1sampleentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1sampleentry">2.1. General Requirements &amp; Brands</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1sampleentry%E2%91%A0">2.2.4. Semantics</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1sampleentry%E2%91%A1">2.4. AV1 Sample Format</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1sampleentry%E2%91%A2">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1sampleentry%E2%91%A3">3. CMAF AV1 track format</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="av1codecconfigurationbox">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox">#av1codecconfigurationbox</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1codecconfigurationbox">2.2.2. Description</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1codecconfigurationbox%E2%91%A0">2.2.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1codecconfigurationbox%E2%91%A1">(2)</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1codecconfigurationbox%E2%91%A2">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1codecconfigurationbox%E2%91%A3">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1codecconfigurationbox%E2%91%A4">(3)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="high_bitdepth">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#high_bitdepth">#high_bitdepth</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-high_bitdepth">2.3.4. Semantics</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="twelve_bit">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#twelve_bit">#twelve_bit</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-twelve_bit">2.3.4. Semantics</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="chroma_subsampling_x">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#chroma_subsampling_x">#chroma_subsampling_x</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-chroma_subsampling_x">2.3.4. Semantics</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="chroma_subsampling_y">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#chroma_subsampling_y">#chroma_subsampling_y</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-chroma_subsampling_y">2.3.4. Semantics</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="chroma_sample_position">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#chroma_sample_position">#chroma_sample_position</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-chroma_sample_position">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-chroma_sample_position%E2%91%A0">(2)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="initial_presentation_delay_minus_one">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#initial_presentation_delay_minus_one">#initial_presentation_delay_minus_one</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-initial_presentation_delay_minus_one">2.3.4. Semantics</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-initial_presentation_delay_minus_one%E2%91%A0">(2)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-initial_presentation_delay_minus_one%E2%91%A1">(3)</a> <a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-initial_presentation_delay_minus_one%E2%91%A2">(4)</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="av1-sample">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1-sample">#av1-sample</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1-sample">2.2.2. Description</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="av1forwardkeyframesamplegroupentry">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1forwardkeyframesamplegroupentry">#av1forwardkeyframesamplegroupentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1forwardkeyframesamplegroupentry">2.3.4. Semantics</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1forwardkeyframesamplegroupentry%E2%91%A0">2.4. AV1 Sample Format</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="av1multiframesamplegroupentry">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1multiframesamplegroupentry">#av1multiframesamplegroupentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1multiframesamplegroupentry">2.4. AV1 Sample Format</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="av1s">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1s">#av1s</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1s">2.4. AV1 Sample Format</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="av1switchframesamplegroupentry">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1switchframesamplegroupentry">#av1switchframesamplegroupentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1switchframesamplegroupentry">2.4. AV1 Sample Format</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="av1metadatasamplegroupentry">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#av1metadatasamplegroupentry">#av1metadatasamplegroupentry</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-av1metadatasamplegroupentry">2.4. AV1 Sample Format</a>
-   </li></ul>
-  </aside>
-  <aside class="dfn-panel" data-for="cmaf-av1-track">
-   <b><a href="https://aomediacodec.github.io/av1-isobmff/#cmaf-av1-track">#cmaf-av1-track</a></b><b>Referenced in:</b>
-   <ul>
-    <li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-cmaf-av1-track">3. CMAF AV1 track format</a>
-    </li><li><a href="https://aomediacodec.github.io/av1-isobmff/#ref-for-cmaf-av1-track%E2%91%A0">4. Common Encryption</a>
-   </li></ul>
-  </aside>
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