[FFmpeg-trac] #10472(avfilter:new): concat filter: new fault between FFmpeg branches 5.1 and 6

[FFmpeg]

#10472: concat filter: new fault between FFmpeg branches 5.1 and 6
-------------------------------------+-------------------------------------
             Reporter:  John         |                     Type:  defect
  Warburton                          |
               Status:  new          |                 Priority:  normal
            Component:  avfilter     |                  Version:  git-
                                     |  master
             Keywords:  concat       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 How to reproduce:
 In FFmpeg latest git as of 13 June 2023, this concat of two pieces of
 audio, produced from the same input, hangs after the first ends. But in
 FFmpeg branch 5.1, it works as expected.

 The point of this code is to copy the first 163 seconds of a news
 broadcast. Then, beyond 163 seconds, search for a brief pause in the
 audio, and end the copy of the audio at exactly that point.

 {{{
 % ffmpeg -v debug -y -i cbsnews-temp.mka -filter_complex
 "[0:0]asplit=2[st][fi];[fi]atrim=start=163,silenceremove=stop_periods=1:stop_threshold=-30dB:stop_duration=0.4,asetpts=N/SR/TB[cl];[st]atrim=end=163,asetpts=N/SR/TB[stc];[stc][cl]concat=n=2:a=1:v=0,asetpts=N/SR/TB,dynaudnorm=b=1:g=7,volume=-11dB"
 -acodec libfdk_aac -ar 48000 -ac 2 -vbr 5 cbsnews.mka

 In latest FFmpeg git, the debug output stops here, showing only one of the
 two segments passed to the concat filter is read properly:

 [Parsed_concat_4 @ 0x55feb835d580] EOF on in0:a0, 0 streams left in
 segment.
 [Parsed_concat_4 @ 0x55feb835d580] Segment finished at pts=163000000

 But in FFmpeg branch 5.1, we have this, in a successful encoding:

 [Parsed_concat_6 @ 0x55dff39e4c80] EOF on in0:a0, 0 streams left in
 segment.
 [Parsed_concat_6 @ 0x55dff39e4c80] Segment finished at pts=162999334
 [Parsed_concat_6 @ 0x55dff39e4c80] EOF on in1:a0, 0 streams left in
 segment.
 [Parsed_concat_6 @ 0x55dff39e4c80] Segment finished at pts=169547293

 ...showing both segments passed to the concat filter are used properly.

 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10472>
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