#11462: Cannot embed .scc file into .mp4 using -c:s copy
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Reporter: Zach | Owner: (none)
Type: enhancement | Status: new
Priority: important | Component:
| undetermined
Version: git-master | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by Devin Heitmueller):
Replying to [comment:25 softworkz]:
> Sure, but that doesn't help Zach for broadcasting, where the CCs need to
be in the video stream.
We don't have definitive requirements about how the file should be
formatted. Some playout systems are fine with the captions being in a
separate stream (in particular if the MP4 will go through a playout system
that outputs as SDI). Hence hearing "for broadcast" doesn't really mean
much, since you would never broadcast an MP4 container without some form
of processing.
That said, if Zach really does need it in the SEI stream, then agreed we
would probably have to make some code changes. The subcc lavfi feature
lets you go from SEI to an AVPacket stream, but we don't really have a
solution today to go in the other direction.
And yes, the "one in, one out" limitation of the BSF framework really does
make this harder, since you can't write a BSF to mix data from two
separate streams.
Also, I'm assuming that he wants to do this entirely in the compressed
domain without re-encoding the video. I would probably suggest two
different approaches depending on whether it needs to be done entirely in
the compressed domain versus if we just have to be able to get the 608
stream recombined with the video AVFrames prior to encoding.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11462#comment:26>
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