[FFmpeg-trac] #10455(ffmpeg:new): ffmpeg fail to merge two video of different orientation only in metadata.

[FFmpeg]

#10455: ffmpeg fail to merge two video of different orientation only in metadata.
-------------------------------------+-------------------------------------
             Reporter:  elias        |                     Type:  defect
  tsolis                             |
               Status:  new          |                 Priority:  critical
            Component:  ffmpeg       |                  Version:  5.1.3
             Keywords:  rotate,      |               Blocked By:
  transpose, freeze frames           |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 Having two videos one horizontally and other vertically oriented.

 a) trying to merge two videos of different orientation, ffmpeg fails to
 autorotate one of the videos and produce a lot of errors with freezed
 frames like "No start code is found." or "Error splitting the input into
 NAL units." or "Error while decoding stream #0:0: Invalid data found when
 processing input".

 b) by rotating in metadata only video, ffmpeg fails too. ```ffmpeg -i
 v1_t.mp4     -c copy -metadata:s:v:0 "rotate=1"     v1_tno.mp4```

 Try to encode two videos - one horizontally and another vertically
 oriented. Same errors - freeze frames produced by ffmpeg.
 So, there is a proper way to merge two videos of different orientation
 without re-encoding two times with ffmpeg?

 Also, there is the problem how can you know if one of these videos is
 "rotated" only in metadata beforehand then?

 best will be ffmpeg to "autdetect" video dimensions and autorotate in
 accordance.

 note that opened this new ticket cause i found the problem of "freezed
 frames ffmpeg behavior"

 ```ffmpeg version 5.1.3-1 Copyright (c) 2000-2022 the FFmpeg developers
 built with gcc 12 (Debian 12.2.0-14)```
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Ticket URL: <https://trac.ffmpeg.org/ticket/10455>
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