[FFmpeg-trac] #5732(avcodec:open): Display corruption on very high-bitrate H.264 files

FFmpeg trac at avcodec.org
Sun Jul 24 22:18:22 EEST 2016

#5732: Display corruption on very high-bitrate H.264 files
             Reporter:  Sesse       |                    Owner:
                 Type:  defect      |                   Status:  open
             Priority:  minor       |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:  h264        |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  0           |

Comment (by Sesse):

 Yes indeed, this reproduces it on my laptop (also Haswell):

 ffmpeg -hwaccel vaapi -ss 12:00 -vaapi_device :0 -i through-the-cracks.mp4
 -vf 'format=nv12,hwupload' -c:v h264_vaapi test.mp4

 It creates a stream (default quantizer 20, I believe) that works perfectly
 if I view it in VLC with vaapi on, but if I set LIBVA_DRIVER_NAME=none
 (effectively sabotaging vaapi, as it looks for a “none” driver), it gets
 completely broken.

 This is with va-i965-driver 0.7.1.

Ticket URL: <https://trac.ffmpeg.org/ticket/5732#comment:16>
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