Why not try "apt", if you have this install or "yum":
Do this in the command line argument:
apt-update #<-----------update your archieves
apt-cache search mplayer. #<-----------check if mplayer exists
if it has, do:
apt-get install mplayer. #finally, install it
It will check for dependencies as well.. So easy and efficient but takes some bandwith.
for yum not to sure:
check available options and do what you want with it.