If you can't play a video file with a non-common codec on your usual media player, VLC Media Player may solve your problem. This multimedia player is compatible with a huge variety of audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, mp3, ogg, ...), or even DVDs and VCDs. It can also be used for streaming a video to your computer, or from it in server mode. This free software is available for Windows, Mac OS X, Solaris, FreeBSD and almost all the Linux distributions.