[FFmpeg-trac] #7963(ffmpeg:closed): Concat demuxer adds time to video duration

FFmpeg trac at avcodec.org
Sat Jul 13 16:50:23 EEST 2019

#7963: Concat demuxer adds time to video duration
             Reporter:  bgx90   |                    Owner:
                 Type:  defect  |                   Status:  closed
             Priority:  normal  |                Component:  ffmpeg
              Version:  4.1     |               Resolution:  invalid
             Keywords:  concat  |               Blocked By:
             Blocking:          |  Reproduced by developer:  0
Analyzed by developer:  0       |
Changes (by mkver):

 * keywords:  concat demuxer protocol concatenate duration mkv => concat
 * status:  new => closed
 * resolution:   => invalid


 1. For lots of transport streams (e.g. those originating from a TV
 broadcast) it is perfectly normal for there not to exist any point where
 you can split the files cleanly on keyframes (because when you split
 everything before the start of a keyframe for PID x, you cut in the middle
 of a packet of PID y; not to mention the PMT/PAT etc.). So the only
 splitting of a transport stream I'd call "bad" is when you split right
 through a transport stream packet.
 2. The concat protocol really does just what cat does (ok, it also
 provides seekability, but that's it).

Ticket URL: <https://trac.ffmpeg.org/ticket/7963#comment:2>
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