[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  |                    Owner:
                 Type:  defect  |                   Status:  new
             Priority:  normal  |                Component:  undetermined
              Version:  3.4     |               Resolution:
             Keywords:          |               Blocked By:
             Blocking:          |  Reproduced by developer:  0
Analyzed by developer:  0       |
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Comment (by hadmut):

 Seems to be the video copy compression.

 replacing the -c copy with -c:a copy or removing all -c options keeps the
 video in sync.

 Using just -c:v copy shows videos out of sync.


 Two of the videos I have trouble with:


   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2avc1mp41
     encoder         : Lavf57.83.100
   Duration: 00:31:52.62, start: 0.000000, bitrate: 3179 kb/s
     Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
 1280x720 [SAR 1:1 DAR 16:9], 2981 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
 (default)
     Metadata:
       handler_name    : VideoHandler
     Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
 stereo, fltp, 192 kb/s (default)
     Metadata:
       handler_name    : SoundHandler



  Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2avc1mp41
     encoder         : Lavf58.3.100
   Duration: 00:31:52.60, start: 0.000000, bitrate: 318 kb/s
     Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 /
 0x31637661), yuv420p, 480x270 [SAR 1:1 DAR 16:9], 249 kb/s, 25 fps, 25
 tbr, 12800 tbn, 50 tbc (default)
     Metadata:
       handler_name    : VideoHandler
       timecode        : 23:02:06:23
     Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
 stereo, fltp, 64 kb/s (default)
     Metadata:
       handler_name    : SoundHandler
     Stream #0:2(eng): Data: none (tmcd / 0x64636D74)
     Metadata:
       handler_name    : TimeCodeHandler
       timecode        : 23:02:06:23

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Ticket URL: <https://trac.ffmpeg.org/ticket/7299#comment:1>
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