Re: [FFmpeg-devel] Captions SCC

From: Marth64 <marth64@proxyid.net>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] Captions SCC
Date: Fri, 7 Feb 2025 10:18:22 -0600
Message-ID: <CAAhd_PWPT2tVoeqnODFBGfYbov1QV2xb-mmDQEb2MQ3Q7UpaKA@mail.gmail.com> (raw)
In-Reply-To: <CANJxsBkYuVh8exMSQ9_Yo40=ApHD4PoeOmxy8nof+ABFv-W5vA@mail.gmail.com>

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?
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