[FFmpeg-trac] #9256(ffmpeg:new): D3D11VA does not work for AV1

[FFmpeg]

#9256: D3D11VA does not work for AV1
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             Reporter:  aufkrawall  |                     Type:  defect
               Status:  new         |                 Priority:  normal
            Component:  ffmpeg      |                  Version:  git-master
             Keywords:  D3D11V      |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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 Run

 ffmpeg -hwaccel d3d11va -i "1080p_av1_29.97fps.mkv" -f matroska - | ffplay
 -

 It should use D3D11VA for decoding, and is the case for H.264 and VP9. But
 it doesn't use hardware decoding for AV1, "Video Codec 0" and 1 don't
 report any usage in Windows Task Manager (it's the weird place where AMD
 driver reports VPU usage). When playing the AV1 file in MPC HC with LAV
 Filters, it uses hardware decoding and there is load reported for "Video
 Codec 0" sensor. This is also the case when decoding H.264/VP9 via D3D11VA
 in ffmpeg.

 ffmpeg 4.4 changelog mentions "DXVA2/D3D11VA hardware accelerated AV1
 decoding", so I think it should work.
 Tested with gyan.dev 2021-05-19-git-2261cc6d8a build.

 Sample: Download this video as AV1 via youtube-dl:
 https://youtu.be/2nXYbGmF3_Q?list=PLyqf6gJt7KuHBmeVzZteZUlNUQAVLwrZS

 Radeon RX 6800, driver 21.5.2, Windows 10 21H1.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9256>
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