It a combine collection of software, program(media player classic/vplayer), filter(Haili Splitter / VSFilter) & codec (FFDSHOW) all role into one
Supports
* Containers:
o AVI (multiple audio streams and softsubs works too)
o Matroska
o OGM
o MP4
* Video codecs:
o XviD
o DivX (all versions)
o Generic/other MPEG4 ASP (3ivx, lavc etc.)
o H.264 (aka. AVC or MPEG4 Part 10)
o Theora
o WMV9
o MPEG2
o MPEG1 is supported by Windows
* Audio codecs:
o MP3 and relatives
o AC3
o DTS
o AAC
o Vorbis
o ADPCM
o LPCM
o FLAC (Free Lossless Audio Codec)
o TTA (True Audio)
http://www.cccp-project.net/