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

FFmpeg trac at avcodec.org
Sun Jul 24 23:19:23 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):

 I compiled x264 from git as today, and compiled ffmpeg against it. I then

 ffmpeg -hwaccel vaapi -ss 12:00 -vaapi_device :0 -i through-the-cracks.mp4
 -c:v libx264 -qp 20 -preset medium test2.mp4

 which hopefully should be comparable in quality.

 The file produced was actually _larger_ than the QSV one (1892 MB for QSV,
 2105 MB for x264). And x264 is of course much, much slower; on my dual-
 core Haswell i7 laptop, eating all the CPU, overall speed was 0.201x
 realtime (and there are some easy sections in the beginning). For
 comparison, QSV on the same machine was 2.16x realtime.

Ticket URL: <https://trac.ffmpeg.org/ticket/5732#comment:20>
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