[MPlayer-dev-eng] [PATCH] add support of compression algorithm 3 in mkv demuxer

[compn]

On Wed, 7 May 2008 11:05:42 +0400
"Alexander Beregalov" <a.beregalov at gmail.com> wrote:

> 2008/5/7 compn <tempn at twmi.rr.com>:
> >
> > On Wed, 7 May 2008 02:24:48 +0400
> >  "Alexander Beregalov" <a.beregalov at gmail.com> wrote:
> >
> >  > Specs from http://www.matroska.org/technical/specs/ :
> >  > ContentCompAlgo         The compression algorithm used. Algorithms that have
> >  > been specified so far are: 0 - zlib, 1 - bzlib, 2 - lzo1x, 3 - Header
> >  > Stripping.
> >  > ContentCompSettings    Settings that might be needed by the
> >  > decompressor. For Header Stripping (ContentCompAlgo=3), the bytes that
> >  > were removed from the beggining of each frames of the track.
> >  >
> >  > I have such file, it works for me.
> >  >
> >  > | + A track
> >  > |  + Track number: 2
> >  > |  + Track UID: 2
> >  > |  + Track type: audio
> >  > |  + Lacing flag: 1
> >  > |  + Default flag: 1
> >  > |  + Codec ID: A_AC3
> >  > |  + Content encodings
> >  > |   + Content encoding
> >  > |    + Content compression
> >  > |     + Algorithm: 3 (header removal)
> >  > |     + Settings: length 2, data: 0x0b 0x77
> >  >
> >  > See an attachment.
> >  > Please comment.
> >  >
> >
> >  mplayer is slowly moving towards libavformat demuxers
> >  can you check if mplayer -demuxer lavf file.mkv works for you
> >  and if not, send a patch to ffmpeg to add support? :)
> >
> >  also uploading a small sample would be nice.
> >
> >  -compn

> No, it doesnot work.
> I uploaded a file named atlantis405-test.mkv.

thank you for testing and uploading a sample. sample moved to:
http://samples.mplayerhq.hu/Matroska/compressed/atlantis405-test.mkv

please wait for demuxer maintainer to review your patch

-compn