[FFmpeg-devel] Captions SCC

[Marth64]

Hey Zach,

Thanks for the additional context.
Embedding in the traditional sense is not available now.
If archival is also a primary goal, have you checked out the RCWT muxer?

This muxer can collect the original EIA608/CEA708 bytes with all
fields, in A53 Part 4 format,
to a preservable file. The RCWT format is ccextractor's native format
for archival and is publically documented.

You can do something like,
ffmpeg -f lavfi -i "movie=MyMovie.mkv[out+subcc]" -map 0:s -c:s copy
-f rcwt MyMoviePreservedCC.bin

Then postprocess with either ccextractor or FFmpeg, eg
ffmpeg -i MyMoviePreservedCC.bin output.ass
or
ccextractor -trim MyMoviePreservedCC.bin

FFmpeg's EIA608 decoder does an OK job of preserving some formatting
when converting to ASS.
RCWT gives you archival and post processing flexibility.


Does this help?