mplayer just type
<code>gmplayer</code>
or
You can Open from Applications—>Sound&Video—> Mplayer Movie Player
=== Install libdvdcss2 and w32 video cod... 4codecs libdvdcss2</code>
Using above download locations you can install most of the mutimedia codecs for ubuntu.
=== Mplayer Plugin for Firefox ===
If
