[FFmpeg-trac] #7379(avformat:open): Matroska regression after ff_isom_write_avcc() changes

[FFmpeg]

#7379: Matroska regression after ff_isom_write_avcc() changes
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             Reporter:  gontandre    |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  h264         |               Blocked By:
  regression                         |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by jamrial):

 You can't write avcC data to CodecPrivate without at least an sps in
 AVStream->extradata. And without it you get invalid output.

 Either the flv source is broken, or the flv demuxer broken. I see this
 file reports an extradata of size 0. It should instead not try to set
 extradata at all in that case and let libavformat generic code handle it.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7379#comment:2>
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