[FFmpeg-trac] #5216(avformat:open): "could not find corresponding track id 1" for DASH video from Kaltura.com

[FFmpeg]

#5216: "could not find corresponding track id 1" for DASH video from Kaltura.com
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             Reporter:  yan12125     |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  mov          |               Blocked By:
  regression                         |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by 11rcombs):

 This file looks invalid to me. It declares a stream with id=2, but all of
 its sidx indexes reference a nonexistent stream with id=1.

 We could probably degrade gracefully for this case; I'm not sure if we
 should fallback on assuming the index is for the first stream that exists,
 or just ignore indexes for nonexistent streams.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5216#comment:4>
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