[FFmpeg-trac] #4590(undetermined:new): concat filter does not work to loop audio

[FFmpeg]

#4590: concat filter does not work to loop audio
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             Reporter:  cehoyos      |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  concat       |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by Cigaes):

 This is more or less unavoidable: the decoded frames need to be stored for
 the second and third segment while they are encoded for the first segment.
 Storing unlimited amounts of decoded data can almost-crash users' hosts,
 and since it is usually sign that something is wrong in the graph, lavfi
 has fairly low limits.
 I have started reworking lavfi's scheduling, the final result would give
 more fine grained on the size of the buffers, but it is far from done yet
 and I have other more urgent projects.
 In the meantime, you can use the fifo filter to add an unlimited buffer,
 but only do so if it is really necessary.
 For now, unless there is a genuinely useful use case for this, I suggest
 to close this ticket as WONTFIX.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4590#comment:1>
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