VLC is one of the best media player under linux.

VLC is the VideoLAN project's media player. It plays MPEG, MPEG2, MPEG4,
DivX, MOV, WMV, QuickTime, mp3, Ogg/Vorbis files, DVDs, VCDs, and multimedia
streams from various network sources.

VLC can also be used as a streaming server that duplicates the stream it
reads and multicasts them through the network to other clients, or serves
them through HTTP.

VLC has support for on-the-fly transcoding of audio and video formats, either
for broadcasting purposes or for movie format transformations. Support for
most output methods is provided by this package, but features can be added
by installing additional audio plugins (vlc-plugin-pulse, vlc-plugin-sdl)
or video plugins (vlc-plugin-sdl, vlc-plugin-ggi, vlc-plugin-svgalib). There
is also a web browser plugin in the mozilla-plugin-vlc package.