Screaming Penguin - Source Does Matter

Xine is a media player for Unix-Linux. Xine plays all kinds of formats, including mpeg, avi, ogg, mp3, etc. It is very easy to install, and has a killer easy to use interface.

Xine is by far the best \'media player\' I have seen on Linux.

Here are the specific details from the project site:

xine is a free GPL-licensed video player for unix-like systems. It
supports mpeg-2 and mpeg-1 system (audio + video multiplexed) streams,
mpeg elementary streams (audio/video only, e.g. mp3 files), AVI files
with various video formats (some of them by using win32 dlls) and Vorbis
OGG streams. There is some support for quicktime streams (but most
quicktime video and audio codecs are highly proprietary and thus not
supported).

For more info see the site.   http://xine.sourceforge.net/