[FFmpeg-trac] #5969(undetermined:new): Closed Captions broken with h264_qsv encoder

FFmpeg trac at avcodec.org
Mon Nov 21 13:13:21 EET 2016

#5969: Closed Captions broken with h264_qsv encoder
             Reporter:  Sawgr        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:  Captions,    |               Blocked By:
  QSV                                |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
 Summary of the bug:

 Ffmpeg 3.2 has -a53cc turned on by default. It works perfectly well when
 encoding with libx264. Closed Captions from mpeg files are inserted into
 the resulting mp4, and they can be turned on or off when playing the file
 in VLC, any other media player or even Apple TV.

 3.2 is supposed to include the same functionality when encoding with
 h264_qsv (Intel QSV hardware acceleration), but it seems to be somehow
 broken. Captions are included but they are all messed up. Some words show
 up, some are just gibberish.

 How to reproduce:
 % ffmpeg.exe -i "Test.ts" -f mpegts -c:v h264_qsv -c:a:0 libmp3lame -b:a:0
 128k Out2.mp4
 ffmpeg version N-82579-g28d8789
 built on 20161120

Ticket URL: <https://trac.ffmpeg.org/ticket/5969>
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