[FFmpeg-trac] #6798(undetermined:new): crossfade goes into infinite loop in new versions of ffmpeg

FFmpeg trac at avcodec.org
Thu Nov 2 06:55:56 EET 2017


#6798: crossfade goes into infinite loop in new versions of ffmpeg
-------------------------------------+-------------------------------------
             Reporter:  mpegnovice   |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:  cross fade   |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug: Newer version of ffmpeg go into an infinite loop
 trying to cross-fade two videos.  Version
 ffmpeg-20161122-d316b21-win64-static is the last version I have which
 works ok.  New versions such as ffmpeg-20171031-88c7aa1-win64-static or
 ffmpeg-3.4-win64-static fail.
 The input video can be pretty much anything. I extracted 3 seconds which
 demos the problem with the ffmpeg command. The result fade.m2g should look
 the same as either head.m2t or tail.m2t.
 How to reproduce:
 copy tail.m2t head.m2t
 ffmpeg -y -i tail.m2t -i head.m2t -an -filter_complex
 "[0:v]trim=start=0:end=1,setpts=PTS-
 STARTPTS[firstclip];[1:v]trim=start=2:end=3,setpts=PTS-
 STARTPTS[secondclip];[0:v]trim=start=1:end=2,setpts=PTS-
 STARTPTS[fadeoutsrc];[1:v]trim=start=1:end=2,setpts=PTS-
 STARTPTS[fadeinsrc];[fadeinsrc]format=pix_fmts=yuva420p,fade=t=in:st=0:d=1:alpha=1[fadein];[fadeoutsrc]format=pix_fmts=yuva420p,fade=t=out:st=0:d=1:alpha=1[fadeout];[fadein]fifo[fadeinfifo];[fadeout]fifo[fadeoutfifo];[fadeoutfifo][fadeinfifo]overlay[crossfade];[firstclip][crossfade][secondclip]concat=n=3[output];[0:a][1:a]
 acrossfade=d=3 [audio]" -map "[output]" -map "[audio]" fade.m2t -report

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Ticket URL: <https://trac.ffmpeg.org/ticket/6798>
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