[FFmpeg-trac] #9771(avcodec:open): Small MAX_SLICES makes d3d11va (AVC) not bitperfect and causes artifacts (but not CUDA/NVDEC)

[FFmpeg]

#9771: Small MAX_SLICES makes d3d11va (AVC) not bitperfect and causes artifacts
(but not CUDA/NVDEC)
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             Reporter:  Balling      |                    Owner:  (none)
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  d3d11va,     |               Blocked By:
  h264, hwaccel, dxva2               |
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  1            |
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Comment (by Balling):

 There is a limit in dxva2 decoder in nvidia driver, it cannot do
 https://code.videolan.org/-/project/435/uploads/e52babf681e96f453a151d98a65942c8/coow1212l.mp4
  sample, but d3d11 can do it.

 There is no strict limit in sw decoder, MAX_SLICES 32 means nothing, as
 there are 41 slices in  https://github.com/wang-
 bin/QtAV/files/1132086/example.zip and yet it works just fine with
 software decoder and does not warn about anything.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9771#comment:9>
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