[FFmpeg-trac] #10897(undetermined:new): Assertion best_input >= 0 failed at fftools/ffmpeg_filter.c:1909

[FFmpeg]

#10897: Assertion best_input >= 0 failed at fftools/ffmpeg_filter.c:1909
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             Reporter:  Andreas      |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Summary of the bug:

 I use a quite complicated filter expression to extract parts of a video
 and time-stretch these parts. It works fine with ffmpeg 4.0.2, but no
 longer in 6: 6.1 release loops forever and a recent build from master
 throws the above assertion error.

 How to reproduce:

 Run the commandline found in the log files - it is always the same
 command. I provide log files for 4.0.2 where it works, for 6.1 where I
 terminate the infinite loop via Ctrl+C after 10 minutes or so, and master
 with the assertion error.

 The problem is not related to the input video, I tried the same
 commandline with different videos, the result is always the same. For
 completeness you find one of the videos here: https://a-voss.de/ffmpeg/

 It is also not platform dependent, I tried in Windows and Linux.
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Ticket URL: <https://trac.ffmpeg.org/ticket/10897>
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