[FFmpeg-trac] #11231(avfilter:new): "-filter_complex" instrumented error: unexpected video delay

[FFmpeg]

#11231: "-filter_complex" instrumented error: unexpected video delay
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             Reporter:  degradox     |                    Owner:  (none)
                 Type:  task         |                   Status:  new
             Priority:  normal       |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
  filter_complex                     |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by degradox):

 Without `setpts=PTS-STARTPTS` the issue does not happen. In the ffmpeg
 conversion log the number of duplicated and dropped frames also is very
 different:

 - With `setpts=PTS-STARTPTS`: dup=115 drop=837
 - Without `,setpts=PTS-STARTPTS`: dup=120 drop=0

 Adding `setpts=PTS-STARTPTS` to filter_complex introduces this weird bug.
 The question is, should this happen, is this expected?
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11231#comment:7>
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