[FFmpeg-trac] #7299(undetermined:new): Seeking mp4 makes audio/video out of sync

[FFmpeg]

#7299: Seeking mp4 makes audio/video out of sync
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             Reporter:  hadmut        |                     Type:  defect
               Status:  new           |                 Priority:  normal
            Component:  undetermined  |                  Version:  3.4
             Keywords:                |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
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 Hi,

 I'm trying to cut parts from a video with ffmpeg 2.4.2 (ubuntu 18.04) and
 get videos where audio and video are in most cases out of sync, although
 there are cases, where they are still in sync.

 E.g. the video

 taken from
 https://download.media.tagesschau.de/video/2018/0701/TV-20180701-2348-2001.websm.h264.mp4

 ffmpeg -loglevel warning -ss "00:22:39.000" -i
 TV-20180701-2348-2001.websm.h264.mp4 -t "00:00:06.010" -map 0 -c copy
 g1.mp4
 ffmpeg -loglevel warning -ss "00:22:40.000" -i
 TV-20180701-2348-2001.websm.h264.mp4 -t "00:00:05.010" -map 0 -c copy
 g2.mp4
 ffmpeg -loglevel warning -ss "00:22:39.500" -i
 TV-20180701-2348-2001.websm.h264.mp4 -t "00:00:05.710" -map 0 -c copy
 g3.mp4

 only g1.mp4 is in sync. Seems as if this accidently hit the beginning of a
 frame group.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7299>
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