you can also try VLC - http://www.videolan.org/vlc/ - which is some kind of media player, knows audio and video formats. You can also try MPlayer which is a Hungarian project and I'm proud of it :) - being a Hungarian - but I prefer the VLC nowdays because it's multiplatform and lots of friends still using OSX or Windows so I need something I can recommend them which is OSS.
bye, Ago