[FFmpeg-trac] #726(undetermined:open): support for copying SMPTE 436M caption tracks
FFmpeg
trac at avcodec.org
Tue Feb 25 05:41:18 CET 2014
#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.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/726#comment:8>
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