[FFmpeg-trac] #8338(avformat:new): can't copy GoPro metadata

[FFmpeg]

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

 I have not found any workarounds for this problem.
 `copy_unknown`, forcing a tag with `tag:d:0`, disabling `write_tmcd`
 (because this is the stream with which we are having issues with), none
 helps.
 There is a mention of this issue (https://superuser.com/a/1488253) not
 existing in an old version of ffmpeg tagged `4.0.2`. But with my goal
 being re-encoding of the video stream into high quality HEVC, I see no
 reason in messing around with compilation of incompatible software.

 I see a solution in adding a handler for this timecode stream into ffmpeg,
 or making it possible to copy data without known type (?codec?) tag, with
 `copy_unknown`.

 I am looking into the code to find interesting diffs that caused the
 missing type tag fail the copy, but as someone not well acquainted with
 coding software like ffmpeg, I wouldn't hold my hopes up.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/8338#comment:15>
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