[FFmpeg-trac] #726(undetermined:open): support for copying SMPTE 436M caption tracks

[FFmpeg]

#726: support for copying SMPTE 436M caption tracks
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             Reporter:  dericed      |                    Owner:
                 Type:  enhancement  |                   Status:  open
             Priority:  wish         |                Component:
              Version:  git-master   |  undetermined
             Keywords:  cc mxf       |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  1
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Comment (by helmboy):

 To support any VBI data in MXF the UUID for ancillary essences would have
 to be added (060E2B34-04010109-0D010301-020E0000).  Each of these essence
 packets begins with a 16 byte header that specifies the SDI VANC field,
 line, packet wrapping, YUV sample coding and data counts.

 Then the 8-bit DID, SDID and DC follow.

 The DID for EIA608 and EIA-708 is 97 with the SDID of 1 for 708 and  2 for
 608

 Then for a EIA-708 payload, this is encapsulated in a Caption Distribution
 Packet, which always has EIA-608 captions as well.

 The Caption Distribution Packet id is 0x9669

 Fully structure details are on Wikipedia:

 http://en.wikipedia.org/wiki/CEA-708

 and

 https://en.wikipedia.org/wiki/EIA-608

 I hope this is useful to any one.

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Ticket URL: <https://trac.ffmpeg.org/ticket/726#comment:8>
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