[FFmpeg-trac] #10990(undetermined:new): "Assertion best_input >= 0 failed" IFF upsampling AND complex filtergraph

[FFmpeg]

#10990: "Assertion best_input >= 0 failed" IFF upsampling AND complex filtergraph
-------------------------------------+-------------------------------------
             Reporter:  Hunter       |                    Owner:  (none)
  Hogan                              |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Changes (by Hunter Hogan):

 * Attachment "ffmpeg_reports.zip" added.

 reports, loglevel=56, showing error, and reports without error if one
 variable is changed
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Ticket URL: <https://trac.ffmpeg.org/ticket/10990>
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