No alpha channel support?

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
25/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
cpp
Domain
audio-video-rtc, desktop

Research direction

Reproduce the issue with the linked VP9A .webm and VP6A .flv samples, testing both MediaPlayerElement playback and the Win2D canvas via frameserver. Compare the rendered output with the source videos; the work is done when their alpha channels display correctly in the relevant playback paths.

Written by the indexing model from the issue text.

Description

I tried this out with some videos that have transparent backgrounds. A .webm vp9a, and a .flv vp6a. Both videos play but the alpha channel is ignored. I tried playing to a MediaPlayerElement and I also tried playing it to a Win2d canvas via frameserver. Really not sure why the latter wouldn't work. This article has a link to one of the sample videos I used. https://developers.google.com/web/updates/2013/07/Alpha-transparency-in-Chrome-video

Dominant language
C++
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Forks
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