[FFmpeg-trac] #6424(avfilter:new): endless loop in avfilter.c

[FFmpeg]

#6424: endless loop in avfilter.c
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             Reporter:  tinybug   |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avfilter  |                  Version:  unspecified
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 There is an endless loop in forward_status_change(AVFilterContext *filter,
 AVFilterLink *in) of avfilter.c, cause ffmpeg dosen't quit normal.

 ffmpeg version: n3.3.1

 you can reproduce by follow command:
 ffmpeg -ss 9 -t 3 -i 7bed448f-b835-44d0-8838-70bd5a98f116.mp4 -ss 0 -t 3
 -i fbb7460b-233a-48a9-8e19-beb37a5297fe.mp4 -y -filter_complex
 "[0:v]fps=fps=25[fps0];[1:v]fps=fps=25[fps1];[fps1][fps0]overlay=x=50:y=50[overlay];[0:a]afade=type=out:ss=0:d=3[afade100];[1:a]afade=type=in:ss=0:d=3[afade101];[afade100][afade101]amix=inputs=2:duration=shortest[amix10];[overlay][amix10]concat=n=1:a=1:v=1:unsafe=1[v][a]"
 -map [v] -map [a] -vcodec libx264 -pix_fmt yuv420p -r 25 -profile:v main
 -level 3.1 -acodec aac tmp.mp4

 I don't kown how to fix it, so anybody can help? Thanks!

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Ticket URL: <https://trac.ffmpeg.org/ticket/6424>
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