Enabling accelerated video decoding in Firefox on Ubuntu 21.04

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Nope.

$ MOZ_LOG="PlatformDecoderModule:5" firefox
[Child 3388: Main Thread]: D/PlatformDecoderModule PDMInitializer, Init PDMs in Content process
[Child 3388: Main Thread]: D/PlatformDecoderModule VA-API FFmpeg is disabled by platform
[Child 3388: Main Thread]: D/PlatformDecoderModule VA-API FFmpeg is disabled by platform

Screenshot from 2021-10-13 21-38-13
Screenshot from 2021-10-13 21-38-132172×1760 394 KB

Filed 1735694

I should clarify that I can replicate the same issue on Firefox on Windows. I’ve only seen smooth hardware accelerated playback on Microsoft Edge. Haven’t tried Chrome on Windows yet on this system. On Ubuntu, nothing seems to work properly.