[FFmpeg-trac] #5461(avformat:new): concatdec with "-auto_convert 0" fails on mp4

[FFmpeg]

#5461: concatdec with "-auto_convert 0" fails on mp4
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             Reporter:  andrey.utkin  |                    Owner:
                 Type:  defect        |                   Status:  new
             Priority:  normal        |                Component:  avformat
              Version:  git-master    |               Resolution:
             Keywords:  concat        |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
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Comment (by andrey.utkin):

 > Then I suggest you try using it.

 Your suggestion is irrelevant. This is a testcase with _single_ file.
 Stitchable flag is about concatenating several encoding sessions.

 > Maybe different, but that would be the most relevant one.

 I believe it is not technically required to transform entire video to
 Annex B format just to transform it back to AVCC format in MP4 muxer
 immediately afterwards. If you could explain in which way this is
 necessary or beneficial, I'd be grateful to hear.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5461#comment:5>
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