[FFmpeg-trac] #9592(ffmpeg:new): using -filter-complex to concatenate .mp4 hangs

[FFmpeg]

#9592: using -filter-complex to concatenate .mp4 hangs
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             Reporter:  Jeffrey      |                     Type:  defect
  Wilson                             |
               Status:  new          |                 Priority:  important
            Component:  ffmpeg       |                  Version:  4.4.1
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Summary of the bug: using -filter-complex to concatenate .mp4 hangs and
 uses much CPU.
 How to reproduce: Using the files contained in the .zip file, run:

 ffmpeg.exe -i IntermediateTimelineRender_.mp4 -i
 IntermediateTimelineRender_0.mp4 -i IntermediateTimelineRender_1.mp4
 -filter_complex "[0:v:0][1:v:0][2:v:0]concat=n=3:v=1[v]" -map "[v]"  -q:v
 8  IntermediateTimelineRender.mp4
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Ticket URL: <https://trac.ffmpeg.org/ticket/9592>
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