diff --git a/Source/Common/Output_Mkv.h b/Source/Common/Output_Mkv.h
index 8b1ae0a2..d918a7dc 100644
--- a/Source/Common/Output_Mkv.h
+++ b/Source/Common/Output_Mkv.h
@@ -14,6 +14,16 @@
 #include "Common/ProcessFileWrapper.h"
 #include "ThirdParty/TimeCode/TimeCode.h"
 
+//***************************************************************************
+//enums
+//***************************************************************************
+
+enum video_format
+{
+    v210,
+    UYVY,
+};
+
 //***************************************************************************
 // Class matroska_writer
 //***************************************************************************
diff --git a/Source/Common/ProcessFile.cpp b/Source/Common/ProcessFile.cpp
index a97d2ab9..3a0241a6 100644
--- a/Source/Common/ProcessFile.cpp
+++ b/Source/Common/ProcessFile.cpp
@@ -417,7 +417,6 @@ void file::Parse(const String& FileName)
         #if defined(ENABLE_SIMULATOR) || defined(ENABLE_DECKLINK)
         if (CaptureMode == Capture_Mode_DeckLink)
         {
-            video_format VideoFormat = v210;
             uint32_t Width = 720;
             uint32_t Height = DeckLinkVideoMode == Decklink_Video_Mode_NTSC ? 486 : 576;
             uint32_t Num = DeckLinkVideoMode == Decklink_Video_Mode_NTSC ? 30000 : 25;
@@ -425,7 +424,7 @@ void file::Parse(const String& FileName)
             uint32_t SampleRate = 48000;
             uint8_t Channels = 2;
 
-            Wrapper = new FileWrapper(VideoFormat, Width, Height, Num, Den, SampleRate, Channels, DeckLinkTimecodeFormat<Decklink_Timecode_Format_Max);
+            Wrapper = new FileWrapper(Width, Height, Num, Den, SampleRate, Channels, DeckLinkTimecodeFormat<Decklink_Timecode_Format_Max);
         }
         else
         #endif
diff --git a/Source/Common/ProcessFileWrapper.cpp b/Source/Common/ProcessFileWrapper.cpp
index 1ae4d6fe..3beb4220 100644
--- a/Source/Common/ProcessFileWrapper.cpp
+++ b/Source/Common/ProcessFileWrapper.cpp
@@ -26,22 +26,10 @@ FileWrapper::FileWrapper(file* File) : File(File)
 
 //---------------------------------------------------------------------------
 #if defined(ENABLE_DECKLINK) || defined(ENABLE_SIMULATOR)
-FileWrapper::FileWrapper(video_format vid_fmt, int Width, int Height, int Framerate_Num, int Framerate_Den, int SampleRate, int Channels, bool Has_Timecode) : File(nullptr)
+FileWrapper::FileWrapper(int Width, int Height, int Framerate_Num, int Framerate_Den, int SampleRate, int Channels, bool Has_Timecode) : File(nullptr)
 {
     IsMatroska = true;
-    for (string OutputFile : Merge_OutputFileNames)
-    {
-        matroska_output Output;
-        if (OutputFile == "-")
-          Output.Writer = new matroska_writer(&cout, vid_fmt, Width, Height, Framerate_Num, Framerate_Den, Has_Timecode);
-        else
-        {
-            Output.Output = new ofstream(OutputFile, ios_base::binary | ios_base::trunc);
-            Output.Writer = new matroska_writer(Output.Output, vid_fmt, Width, Height, Framerate_Num, Framerate_Den, Has_Timecode);
-        }
-        Outputs.push_back(Output);
-    }
-
+    HasTimecode = Has_Timecode;
     FramesInfo.video_width = Width;
     FramesInfo.video_height = Height;
     FramesInfo.video_rate_num = Framerate_Num;
@@ -84,6 +72,26 @@ void FileWrapper::Parse_Buffer(const uint8_t *Buffer, size_t Buffer_Size)
         if (!FramesInfo.pixel_format && Frame->Pixel_Format)
             FramesInfo.pixel_format = Frame->Pixel_Format;
 
+        if (!Merge_OutputFileNames.empty() && Outputs.empty())
+        {
+            video_format Format = v210;
+            if (FramesInfo.pixel_format == Decklink_Pixel_Format_8BitYUV)
+                Format = UYVY;
+
+            for (string OutputFile : Merge_OutputFileNames)
+            {
+                matroska_output Output;
+                if (OutputFile == "-")
+                    Output.Writer = new matroska_writer(&cout, Format, FramesInfo.video_width, FramesInfo.video_height, FramesInfo.video_rate_num, FramesInfo.video_rate_den, HasTimecode);
+                else
+                {
+                    Output.Output = new ofstream(OutputFile, ios_base::binary | ios_base::trunc);
+                    Output.Writer = new matroska_writer(Output.Output, Format, FramesInfo.video_width, FramesInfo.video_height, FramesInfo.video_rate_num, FramesInfo.video_rate_den, HasTimecode);
+                }
+                Outputs.push_back(Output);
+            }
+        }
+
         for (matroska_output& Output : Outputs)
         {
             Output.Writer->write_frame((const char*)Frame->Video_Buffer, (uint32_t)Frame->Video_Buffer_Size,
diff --git a/Source/Common/ProcessFileWrapper.h b/Source/Common/ProcessFileWrapper.h
index b2ae589c..ac3a1b7c 100644
--- a/Source/Common/ProcessFileWrapper.h
+++ b/Source/Common/ProcessFileWrapper.h
@@ -73,16 +73,6 @@ struct matroska_output
 };
 #endif
 
-//***************************************************************************
-//enums
-//***************************************************************************
-
-enum video_format
-{
-    v210,
-    UYVY,
-};
-
 //***************************************************************************
 // Class FileWrapper
 //***************************************************************************
@@ -91,7 +81,7 @@ class FileWrapper {
 public:
     FileWrapper(file* File); // Constructor for DV/MediaInfo Interface
     #if defined(ENABLE_DECKLINK) || defined(ENABLE_SIMULATOR)
-    FileWrapper(video_format vid_fmt, int Width, int Height, int Framerate_Num, int Framerate_Den, int SampleRate, int Channels, bool Has_Timecode = false); // Constructor for Decklink/Matroska Interface
+    FileWrapper(int Width, int Height, int Framerate_Num, int Framerate_Den, int SampleRate, int Channels, bool Has_Timecode = false); // Constructor for Decklink/Matroska Interface
     ~FileWrapper();
     #endif
     void Parse_Buffer(const uint8_t* Buffer, std::size_t Buffer_Size);
@@ -104,6 +94,7 @@ class FileWrapper {
     file* File;
     #if defined(ENABLE_DECKLINK) || defined(ENABLE_SIMULATOR)
     bool IsMatroska = false;
+    bool HasTimecode = false;
     std::vector<matroska_output> Outputs;
     size_t FrameCount = 0;
     #endif