#7352: After extraction video AVC/H264 stream from DASH mp4-segment SEI messages
are put prior SPS/PPSges
-------------------------------------+-------------------------------------
             Reporter:  Shevach      |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  h264,dash    |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 mp4-dash segment containing AVC/H264 video is not self-decoded since
 SPS/PPS are present in mp4 init-file (within stsd-box).
 '''To make a mp4-dash segment decodable''' i concatenate the init-file
 with the segment and then apply ffmpeg to extract the elementary video
 stream, e.g.

 ffmpeg -i test.mp4 -vcodec copy -vbsf h264_mp4toannexb -f h264 test.h264

 i receive AVC/H.264 stream with the start SEI messages (e.g. timing SEI)
 transmitted prior to SPS/PPS.

 To reproduce this issue i attach test.mp4 (which is a concatenation of
 init.mp4 and a mp4 dash segment.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7352>
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