[FFmpeg-devel] DVD subtitles

Erik Slagter erik
Thu Feb 28 19:27:27 CET 2008

Vitor Sessak wrote:
> Yes, that's what I have in mind. A nice way to test the inclusion of 
> subtitle pads would be writing a subtitle capitalization filter (yes, I 
> know, it's a bit useless, but it should be easier to debug than the 
> hardsub one).

Ehmmm, afaik subtitles are pixel-format internally in libav*. If not, 
there would really be a problem using DVD subtitles.

>> Anyway, for the moment I am using a some q&d tricks to achieve my goal, 
>> but if libav* is up for it and you're available to point me in the right 
>> direction, I'd take on the challenge.

> Nice! More developers in libavfilter are really welcome!

Yeah, I know, I have been following ffmpeg-devel since 2001 or so ;-) 
It's a too big hump of code to grok in one piece, especially if you also 
have daytime job...

> Maybe the first step would be looking what new functions pointers to add 
>   to the AVFilterPad struct. I'd say a (*request_subtitle) method and 
> maybe renaming poll_frame to just poll...

If you don't mind I'll await the complete inclusion of libavfilter 
first. I'd rather not have another svn repository to keep up with.
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