[FFmpeg-trac] #9487(ffmpeg:open): FFmpeg -shortest not working when using -filter_complex with audio and video filters

[FFmpeg]

#9487: FFmpeg -shortest not working when using -filter_complex with audio and
video filters
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:  (none)
  pigeonburger                       |
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  ffmpeg
              Version:  git-master   |               Resolution:
             Keywords:  shortest     |               Blocked By:
  filter_complex audio video         |
  audio/video filters                |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Comment (by Michael Koch):

 The amix filter has a "duration" option. It works if you set this option
 to "shortest".
 But this doesn't explain why the -shortest option doesn't work.

 {{{
 ffmpeg -i input.mp4 -i song.m4a -lavfi
 [0:a][1:a]amix=duration=shortest[s0];[0:v]null[s1] -map [s0] -map [s1] -y
 output.mp4
 }}}
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Ticket URL: <https://trac.ffmpeg.org/ticket/9487#comment:5>
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