[FFmpeg-trac] #9079(avformat:new): No head frame in new MXF Muxer

[FFmpeg]

#9079: No head frame in new MXF Muxer
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             Reporter:  FranceBB    |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:  MXF         |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by FranceBB):

 As to the commit, we've been testing several different builds to try to
 find out what went wrong between August and now and we tracked that
 individual commit, in fact the August 2020 builds before that commit are
 fine and the subsequent ones are not. If we analyse that commit, what is
 doing is writing information about the color primaries, the transfer
 characteristics and the color space to the .mxf header, thus changing the
 header. By doing so, decoders find data that don't expect instead of the
 one that usually is supposed to be there and they fail. As a double check,
 if we encode the very same file with the very same parameters muxed in MXF
 with the latest FFMpeg master, but removing color_primaries, color_trc and
 color_space, the file is recognised again 'cause the header is exactly the
 same of how it used to be. I'm not saying that writing those things in the
 header is wrong and I don't know whether other muxers like BBC BMX
 Transwrap are doing it or not, but I definitely think that they're not
 written in the right place inside the header as they're causing many
 broadcast decoders to misbehave.

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Ticket URL: <https://trac.ffmpeg.org/ticket/9079#comment:9>
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