[FFmpeg-trac] #6128(undetermined:new): Using the concat demuxer with images and specified duration directives produces wrong duration

[FFmpeg]

#6128: Using the concat demuxer with images and specified duration directives
produces wrong duration
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             Reporter:  mulvya       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by mulvya):

 Does not work with MP4. Works without duration for MKV. Remuxing MKV to
 MP4 collapses video to n frames where n is number of entries. Producing
 MKV with -vsync cfr produces same result as MP4. Producing MP4 with -vsync
 vfr produces same result as MKV with no vsync option applied.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6128#comment:4>
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