[FFmpeg-devel] Question on line 21 data in wtv

Peter Ross pross at xvid.org
Sat Oct 20 12:17:25 CEST 2012

On Fri, Oct 19, 2012 at 07:16:07PM +0200, Carlos Fernandez wrote:
> Hi,
> I'm one of the authors of CCExtractor, a small program to extract
> closed caption data and convert to srt. I'm currently working on
> adding support for wtv format, and I see you guys have figured it out
> - so maybe someone here is able to reply a quick question on line 21
> data in wtv, even if this isn't really a ffmpeg development question.
> It would save me some time of analysis.

see the discussion here: https://ffmpeg.org/trac/ffmpeg/ticket/1482

> >From what I seen, line 21 data is more or less saved as in DVDs (for
> which I haven't been able to find any official specs, by the way -
> "only" McPoodle's reverse engineered description). However, there's
> some differences that make parsing a bit difficult. I'm working with
> very few samples (I don't have a TV capture card myself, so I rely on
> what other people send me) which also doesn't help much. Anyway,

i have a couple of other Line21 samples. they're kinda big, if you want
them, tell me where to upload.

-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)
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