[FFmpeg-trac] #4804(undetermined:new): "Buffer queue overflow, dropping." when splitting input into thumbnail and overlay filters.

[FFmpeg]

#4804: "Buffer queue overflow, dropping." when splitting input into thumbnail and
overlay filters.
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             Reporter:  starfires    |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  important    |                Component:
              Version:  git-master   |  undetermined
             Keywords:  regression   |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by starfires):

 Yes!  Running the overlay input through fifo fixes it.
 Breaks: ..."[ovl1][1:v]overlay[out1]"...
 Works:  ..."[ovl1]fifo[ovl2];[ovl2][1:v]overlay[out1]"...

 Thanks, I will use this as a workaround!  Unless... is there a downside?
 If I use this for long videos (and optionally tell thumbnail filter to
 stop processing after its first or second thumbnail), will frames
 accumulate in the fifo and fill up my RAM?

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Ticket URL: <https://trac.ffmpeg.org/ticket/4804#comment:6>
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