[FFmpeg-devel] [PATCH 1/4] lavc: correctly set AVSubtitle format for text based subtitles.

Clément Bœsch ubitux at gmail.com
Wed Jan 2 10:06:22 CET 2013

On Mon, Dec 31, 2012 at 06:24:31PM +0100, Wolfram Gloger wrote:
> Clément Bœsch <ubitux at gmail.com> writes:
> > I believe this whole thing is pretty fragile anyway.
> >
> > Alternative: transform this format thing into flags:
> >     0: undefined/loop yourself/fix the decoder
> >  1<<0: i haz text
> >  1<<1: i haz bitmap
> >
> > Whatever you prefer, but that might break later anyway. Feel free to send
> > any patch.
> I'll send a patch for ffplay first.
> > You're working on teletext support? Can you tell us more?
> Sure, it is based on libzvbi and can generate bitmap and text subtitles
> (controlled by -teletext_bitmap).
> Note!  Most of these patches are teletext related but some are not and
> definitely not ready for merging.
> http://www.malloc.de/ffmpeg-patches/ffmpeg-72ff8ee-wg.diff

Interesting. Feel free to discuss your work regularly on the mailing-list
or IRC. AFAIU your patch is all about extracting as bitmap or text from
the "VBI lines" of a video, right? Do you plan to work on
decoding/encoding teletext from a muxed version?

Clément B.
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