video: fix bugs

[garymm]

• handle non-even input dimensions by padding
• handle float inputs by scaling
• upload artifacts to the correct directory

Change-Id: I84c7fe4cbcd311ed67f736b0e035ec32a9566cca

[codecov]

Codecov Report

Attention: Patch coverage is 95.45455% with 1 line in your changes missing coverage. Please review.

Project coverage is 93.69%. Comparing base (b0b1e12) to head (e84187f).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...p_utils/metric_writers/_audio_video/audio_video.py	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
- Coverage   93.69%   93.69%   -0.01%     
==========================================
  Files          45       45              
  Lines        2713     2728      +15     
==========================================
+ Hits         2542     2556      +14     
- Misses        171      172       +1     

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