The Core Pocket Media Player is an open-source media player for Palm OS-based and Windows CE / Windows Mobile-based devices.

Supported file containers
- AVI (*.avi)
- Matroska (*.mkv, *.mka)
- MP4 (*.mp4, *.m4a)
- Ogg Media (*.ogg, *.ogm)
- ASF (*.asf)

Supported audio codecs
- Mpeg 1 Layer III
- Ogg Vorbis
- Musepack
- Windows Media Audio (on Windows Mobile devices)
- AC-3
- AMR
- Adpcm, uLaw

Supported video codecs
- DivX
- XviD
- MPEG4-SP (plus B-frame support)
- MPEG1
- M-JPEG
- Windows Media Video (on Windows Mobile devices)

Link

Download