[FFmpeg-devel] [RFC/PATCH] matroska demuxer doesn't decode the zlib encoding on vobsubs

[Aurelien Jacobs]

M?ns Rullg?rd wrote:

> Aurelien Jacobs <aurel at gnuage.org> writes:
> 
> > elupus wrote:
> >
> >> Hi,
> >> 
> >> Currently the vobsub data coming out of lavf, is zlib encoded, and
> >> can't be fed directly into lavc's dvd demuxer, even thou the
> >> codec_id matches.
> >> 
> >> This "patch" decodes the zlib encoding. It's uggly and hackish, so
> >> not intended to be included in ffmpeg. It's mainly for discussion,
> >> and for anybody that needs vobsub support from lavf.
> >> 
> >> Apperently any track in matroska can be either zlib or lzo
> >> compressed. (i'd assume there might be others). mplayer's matroska
> >> demuxer handles this, but lavf doesn't currently.
> >> 
> >> Would be nice to see support for this in ffmpeg's demuxer too. I
> >> doubt i'll work on it much more, but maybe this could get some
> >> mplayer dev going adding support since they want to get away from
> >> their own demuxers and use lavf's instead :)
> >
> > That's something I wanted to add since quite some time.
> > But I was waiting for M?ns native zlib decoder to be commited.
> > I hope this will happen soon.
> > When native zlib is in, I will cleanup this patch to use it,
> > and commit.
> 
> Why can't you use system zlib in the meantime?  The dependency is
> already there anyway.

Sure, I could (maybe I will). I just wasn't very motivated to use
it when something more exciting was around the corner.

Aurel