[FFmpeg-trac] #5677(undetermined:open): Videotoolbox encoder does not preserve A53_CC side data

[FFmpeg]

#5677: Videotoolbox encoder does not preserve A53_CC side data
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             Reporter:  tmm1         |                    Owner:  kernrj
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by tmm1):

 libavcodec/libx264.c and libavcodec/qsvenc_h264.c both support a `-a53cc
 1` option where the caption data is copied to the encoded output. I'm
 trying to figure out how to pass extra SEI payloads to videotoolbox in a
 similar fashion so we can implement the equivalent option.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5677#comment:2>
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