[FFmpeg-trac] #6393(undetermined:new): First second of output video frozen when video stream copied and audio stream transcoded for Sony H.264 file

[FFmpeg]

#6393: First second of output video frozen when video stream copied and audio
stream transcoded for Sony H.264 file
-------------------------------------+-------------------------------------
             Reporter:  horshack     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  h.264 copy   |               Blocked By:
  sony freeze copyinkf               |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 When performing a video copy (-c:v copy) and any audio transcode (ex: -c:a
 aac) of a Sony H.264 file (Sony A7s/A6300/etc..), the first second of
 video in the output file is frozen while the audio plays normally. The
 problem doesn't occur if -copyinkf is specified, even though the first
 frame of the H.264 input video is a keyframe. When comparing the generated
 files of -copyinkf specified vs not specified, the file without -copyinkf
 has 0.45 seconds of audio frames (stream #1) before the first video frame
 (stream #0), whereas the file with -copyinkf has video as the first frame
 (stream #0).

 How to reproduce:
 ffmpeg -i C0002.MP4 -c:v copy -c:a aac output.MP4

 Sample C0002.MP4 source video (90MB) can be downloaded at:
 https://drive.google.com/open?id=0Bx7l38U9UxF8cGlScjZnYjBnMDA

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Ticket URL: <https://trac.ffmpeg.org/ticket/6393>
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