[FFmpeg-trac] #6902(undetermined:closed): concat outputs only the first file

FFmpeg trac at avcodec.org
Sat Dec 9 00:14:21 EET 2017

#6902: concat outputs only the first file
             Reporter:  xamarin      |                    Owner:
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:  invalid
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0

Comment (by llogan):

 It is not possible to simply physically concat MP4 on a file level such as
 by using the concat protocol and expect it to work.

 From the [https://ffmpeg.org/faq.html#How-can-I-join-video-files_003f FAQ]
 regarding the concat protocol:

 > A few multimedia containers (MPEG-1, MPEG-2 PS, DV) allow one to
 concatenate video by merely concatenating the files containing them.

 As Carl said, use the concat demuxer or concat filter instead for your MP4

Ticket URL: <https://trac.ffmpeg.org/ticket/6902#comment:3>
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