[FFmpeg-trac] #4384(undetermined:new): H.264 dxva2 hardware decoding fails as of 22 Mar 2015

FFmpeg trac at avcodec.org
Mon Mar 23 15:55:34 CET 2015

#4384: H.264 dxva2 hardware decoding fails as of 22 Mar 2015
             Reporter:               |                    Owner:
  JohnWarburton                      |                   Status:  new
                 Type:  defect       |                Component:
             Priority:  normal       |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  H264 DXVA2   |               Blocked By:
  hwaccel                            |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |

Comment (by JohnWarburton):

 Using mpv linked to the FFmpeg libraries built using your patch and using
 hardware decoding (I have checked for this in mpv's stdout report), the
 problem is fixed on my test system.

 But there is still a major problem using FFmpeg alone with hardware
 decoding. Instead of a constantly green window, I am now seeing two or
 three flashes per second of the correct picture, but much of the decoding
 is still shown as a picture with randomly-changing blocks exhibiting
 shades of green. The error message is still "hardware accelerator failed
 to decode picture". So this is odd: mpv with the patched library works;
 FFmpeg (opengl and SDL output, I tested both) is slightly better, but
 still broken.

Ticket URL: <https://trac.ffmpeg.org/ticket/4384#comment:3>
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