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

[compn]

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