[FFmpeg-trac] #1663(undetermined:new): Multiple named pipes don't work

[FFmpeg]

#1663: Multiple named pipes don't work
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             Reporter:  burek        |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by reimar):

 I don't think FFmpeg really uses to different threads.
 But regardless of that, both FFmpeg instances will try to keep A-V sync
 and as soon as one makes a different decision on whether audio or video
 must come next to keep sync it will hang.
 It can at best work when at least one has A-V sync handling disabled
 (which is basically what the second approach does).
 It would still be very brittle, the only approach I can recommend is to
 just mux the two streams together if you want to process them together.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1663#comment:7>
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