[FFmpeg-trac] #11597(avfilter:new): FFmpeg output is stuck if using split with fps filter

[FFmpeg]

#11597: FFmpeg output is stuck if using split with fps filter
-------------------------------------+-------------------------------------
             Reporter:  TheTroll     |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:  avfilter     |                  Version:  git-
             Keywords:  split        |  master
  thumbnail                          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 How to reproduce:
 {{{
 % ffmpeg -re -y -i INPUT -filter_complex
 "[0:v]split=2[s0][sthumb];[s0]scale=320:184[o0];[sthumb]fps=1/60[othumb]"
 -an -c:v libx264 -map [o0] out.ts -map [othumb] -update 1 out.png
 }}}

 Built on master

 When trying to transcode an input live stream while extracting thumbnails
 (every minute in this example), using the split and fps filters, FFmpeg
 gets blocked and eventually generates the output after a while, by bursts.

 The following warning indicates that something is wrong:

 [out_#0:0 @ 0x7f1018013c00] 100 buffers queued in out_#0:0, something may
 be wrong.

 FFmpeg 5.1.2 works fine and as expected.

 Thanks
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11597>
FFmpeg <https://ffmpeg.org>
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