MPlayer
From MediaCoderWiki
MPlayer is a free and open source media player distributed under the GNU General Public License. The program is available for all major operating systems, including Linux and other Unix-like systems, Microsoft Windows and Mac OS X. Versions for AmigaOS and MorphOS are also available.
MPlayer is known to support a wide variety of media formats. In addition to its wide range of supported formats MPlayer can also save all streamed content to a file.
A companion program, MEncoder, can take an input stream or file and transcode it into several different output formats, optionally applying various transforms along the way.
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