[FFmpeg-trac] #10566(undetermined:new): AV1 decoding with -hwaccel d3d11va performance issue

[FFmpeg]

#10566: AV1 decoding with -hwaccel d3d11va performance issue
-------------------------------------+-------------------------------------
             Reporter:  Evgeny       |                     Type:
                                     |  enhancement
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:  av1          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 When I try to use av1 hardware decoder with -hwaccel d3d11va, then
 hardware AV1 decoder is working in one thread only, because FPS for video
 decoding is the same with and without `-threads 1` option, VCN utilization
 is about 53% for both commands.

 If I use the same command on hevc / h264 video, then I got 98% of VCN
 utilization without passing option `-threads 1` and 55% of VCN
 utilization.
 I tested on AMD GPU 6800XT & on notebook with Intel/NVidia GPU and it
 seems that this issue is general for av1 hardware decoders.
 I found that av1_decoder doesn't setup AV_CODEC_CAP_FRAME_THREADS option
 in .p.capabilities while hevc&h264 does, does AV1 decoder support
 multithreading?
 How to reproduce:
 {{{
 % ffmpeg.exe -hwaccel d3d11va -i av1_source.mp4 -f null -
 % ffmpeg.exe -threads 1 -hwaccel d3d11va -i av1_source.mp4 -f null -
 ffmpeg version: git-master
 built on Windows
 }}}
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Ticket URL: <https://trac.ffmpeg.org/ticket/10566>
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