[Bug 1889784]

[Jacobmee]

I am experiencing the exact same issue as Ronan Jouchet and Anan Laks.

- I am on X11/intel modesetting
- I have MOZ_X11_EGL=1, media.ffmpeg.dmabuf-textures.enabled:true , media.ffmpeg.vaapi.enabled:true , media.ffvpx.enabled:false
- I play a video, check with intel_gpu_top that HW acceleration is working (it is) 
- the video is just green. 

Like Ronan I have also been able to reproduce this on a completely
vanilla nightly profile. This happens with both h264 and VP9 video like
in Anan's case.

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https://bugs.launchpad.net/bugs/1889784

Title:
  Hardware-accelerated video decoding (VA-API) broken in Firefox 79
  (Wayland)

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