[FFmpeg-trac] #8338(avformat:new): GoPro metadata not properly handled

[FFmpeg]

#8338: GoPro metadata not properly handled
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             Reporter:  importon     |                    Owner:  (none)
                 Type:  enhancement  |                   Status:  new
             Priority:  wish         |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  mov GPMF     |               Blocked By:
  TMCD                               |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Kamil Filipek):

 The workaround is tested and works without issues.
 Here is a release for anyone interested in playing with their GoPro
 footage (in my case re-encoding into more condensed H265)
 https://github.com/HighPriest/FFmpeg/releases/tag/Temp_GoPro_Workaround

 The workaround **IS NOT SAFE FOR PRODUCTION**, as it is essentially
 skipping `codec_validation` function present in remuxer code.
 The skip happens only for streams with **unknown** codec_tag, which
 shouldn't be mapped by ffmpeg anyway, if **copy_unknown** flag is not set.
 But I am only speculating based on my findings from one day.
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Ticket URL: <https://trac.ffmpeg.org/ticket/8338#comment:22>
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