[FFmpeg-trac] #1670(FFmpeg:new): -filter_complex doesn't handle well finite video + infinite audio

[FFmpeg]

#1670: -filter_complex doesn't handle well finite video + infinite audio
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             Reporter:  ubitux       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  FFmpeg
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
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Comment (by Cigaes):

 Except for the time that no longer progress (I posted a patch about that
 yesterday), that is normal and expected, if not desirable.

 ffmpeg is still encoding audio silence, and since you privided an infinite
 quantity of it, it will never stop. The muxer wants to interleave audio
 and video, but no video is coming, so audio gets queued, thus the memory
 use growing and not the file. If you quit ffmpeg cleanly (hit q), all the
 data gets written to the file at once.

 There may be ways of enhancing things (maybe some way to signal a stream
 is finished so that the interleaving does not wait for it), but I do not
 think there is something fundamentally wrong in ffmpeg's reaction to this
 hostile situation.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1670#comment:1>
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