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

Måns Rullgård mans
Wed Nov 28 01:18:55 CET 2007

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.

M?ns Rullg?rd
mans at mansr.com

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