Re: [FFmpeg-devel] Captions SCC

[Devlist Archive <devlist@rlb.org>]

>
> You have never successfully "embedded" an scc file as CEA-608.
> I had told you that twice already. Marth64 has told you the same.
>
> That's not possible right now. Your commands are adding the scc
> captions as mov_text (TTXT) subtitle stream, not as 608 CC.


That is why this discussion of extraction/embedding is happening here on
the devlist instead of moving it to Trac like the transcoding issue.  The
question is what do we need to do to demux/extract 608CC or mux/embed it.
The 608 is already encoded and does not need to be reencoded or converted
as embed/extract does not change the frame rate.  Thus some sort of
bitstream filter will be required and it appears like subcc may or may not
support passing the required information.

On Fri, Feb 7, 2025 at 12:58 PM Soft Works <
softworkz-at-hotmail.com@ffmpeg.org> wrote:

>
>
> > -----Original Message-----
> > From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
> > Devlist Archive
> > Sent: Friday, February 7, 2025 9:50 PM
> > To: FFmpeg development discussions and patches <ffmpeg-
> > devel@ffmpeg.org>
> > Subject: Re: [FFmpeg-devel] Captions SCC
> >
> > At some point we will need to separate the embed/extract conversation
> > from
> > the transcode conversation.  I have made a ticket over on Trac that
> > covers
> > the information for the transcode issue.  Let's focus on what needs
> > to
> > happen to be able to generate a valid CEA-608 .scc file and embed
> > such a
> > file to mp4 on this thread.  The EP12 folder on that drive link
> > contains
> > captions files generated by the content producer using CaptionsMaker.
> > That
> > captions maker .scc file behaves differently and fails to embed
> > compared to
> > the premiere produced one.
>
> You have never successfully "embedded" an scc file as CEA-608.
> I had told you that twice already. Marth64 has told you the same.
>
> That's not possible right now. Your commands are adding the scc
> captions as mov_text (TTXT) subtitle stream, not as 608 CC.
>
> sw
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