For a complete MPlayer installation you will need sources, a set of binary codecs, and a skin if you want a graphical user interface. Quick compilation and installation instructions are contained in the README, the installation section of the documentatio
Mplayer is available in all major Linux distribution including Ubuntu, Debian, Fedora etc. You can install it from the software center of your distribution or use the package manager of your distribution.
Softpedia distributes the main source archive for MPlayer application, which needs to be extracted, configured, compiled and installed on your Linux operating system.