Re: [FFmpeg-devel] Captions SCC

[Soft Works <softworkz-at-hotmail.com@ffmpeg.org>]

> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
> Devlist Archive
> Sent: Friday, February 7, 2025 8:31 PM
> To: FFmpeg development discussions and patches <ffmpeg-
> devel@ffmpeg.org>
> Subject: Re: [FFmpeg-devel] Captions SCC
> 
> >
> > The cc_fifo mechanism is actually implemented within the various
> > filters which change the framerate (deinterlacing, framerate
> > conversion, interlacing), so no extra command line arguments are
> > required.  There are some edge cases though that don't properly
> handle
> > it, and those mainly relate to cases such as the captions crossing
> > back/forth between SEI and dedicated caption tracks (e.g. MP4 with
> a
> > caption track, the subcc output, etc).
> >
> 
> Ok, based on this information I am going to make a bug report ticket
> for
> the particular type of mp4 files I am using because while some
> caption data
> is passed, it is garbled and the transcoding process is producing
> errors.
> I was not aware that some work had been done to try to solve the
> frame rate
> conversion issue already as the behaviour of ffmpeg implies that it
> doesn't
> try to compensate for those changes for the file types I am working
> with.
> There are also bugs in the subcc function that seem to be affecting
> display
> time and other metadata.
> 
> I assume that it would be more efficient and better to fix the
> existing 608
> only data path before trying to expand things to include 708?
> 
> Zach
 

Unfortunately, there's no bug which could be "fixed". 
For a proper solution, a CEA-608 ENcoder is required. 
And more - like already said.

sw

 
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