[FFmpeg-trac] #10374(avcodec:new): Problems to decode certain h264 keyframes with D3D11VA and DXVA2 hw acceleration

[FFmpeg]

#10374: Problems to decode certain h264 keyframes with D3D11VA and DXVA2 hw
acceleration
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             Reporter:  Florian      |                    Owner:  (none)
  Grill                              |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avcodec
              Version:  6.0          |               Resolution:
             Keywords:  H264 dxva2   |               Blocked By:
  d3d11va                            |
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  1            |
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Comment (by Florian Grill):

 Okay I see thanks for the explanation, not sure how much overhead this
 produces actually but could not be that much but I see why it's that low
 then. As long as dxva2_h264.c overrides that value it's fine anyway.
 Which then brings me to the second bug, the small buffer problem with
 DXVA2 on Nvidea GPUs (if the slices are set to 256 already). This is
 something I have no explanation for, might be a driver issue but not sure.
 For now I could only reproduce the small buffer problem on devices with an
 NVIDEA GPU
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Ticket URL: <https://trac.ffmpeg.org/ticket/10374#comment:4>
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