[FFmpeg-trac] #8517(avformat:new): segment output first flv file video corrupted

[FFmpeg]

#8517: segment output first flv file video corrupted
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             Reporter:  Vonger      |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  important   |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:  segment     |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  1           |
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Changes (by mkver):

 * analyzed:  0 => 1
 * priority:  normal => important
 * reproduced:  0 => 1


Comment:

 This is a regression since 053d33b46b169f35e644ddbf2a2e482515d3a8fe. The
 segment muxer resets the codec_tag before writing the header since this
 commit due to faulty logic in seg_write_header().

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Ticket URL: <https://trac.ffmpeg.org/ticket/8517#comment:7>
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