[FFmpeg-devel] DVD subtitles

Vitor Sessak vitor1001
Thu Feb 28 20:01:33 CET 2008


Erik Slagter wrote:
> 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.

Are you sure? I'd say it is more as a codec as any other, but not a 
pixel format... Anyway, I have never touched the subtitle code, so maybe 
you know better...

>>> 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.

Sounds logical. Let's hope it'll be pretty soon :-)


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