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

FFmpeg trac at avcodec.org
Sun Feb 5 13:08:23 EET 2017


#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 Cigaes):

 The incorrect duration in the second case goes away with Matroska output;
 it seems an artifact of the MP4 format or muxer. It is unrelated to
 concat, as it produces the same result when converting from the correct
 Matroska file obtained earlier.

 To get things working, you need to have the duration of the last image be
 a single frame for your chosen frame rate. Since you did not specify
 anything, that means 25 FPS, so the last segment need to be {{{duration
 0.04}}}.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6128#comment:3>
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