here is the easy way to install mplayer for fedora linux.

step 1:
goto http://rpm.livna.org/rlowiki/
choose and install Fedora 8 repository RPM

step 2:
run the command in terminal
yum -y install mplayer

done.
please wait for a while for it to be installed. show below:
livna 100% |=========================| 2.1 kB 00:00
fedora 100% |=========================| 2.1 kB 00:00
development 100% |=========================| 2.1 kB 00:00
Setting up Install Process
Parsing package install arguments
Resolving Dependencies
..............
Transaction Test Succeeded
Running Transaction
Installing: lirc ####################### [ 1/11]
Installing: fribidi ####################### [ 2/11]
Installing: aalib ####################### [ 3/11]
Installing: xvidcore ####################### [ 4/11]
Installing: libdca ####################### [ 5/11]
Installing: libcaca ####################### [ 6/11]
Installing: libdvdread ####################### [ 7/11]
Installing: libdvdnav ####################### [ 8/11]
Installing: enca ####################### [ 9/11]
Installing: libmpcdec ####################### [10/11]
Installing: mplayer ####################### [11/11]

Installed: mplayer.i386 0:1.0-0.88.rc2.lvn8
Dependency Installed: aalib.i386 0:1.4.0-0.13.rc5.fc8 enca.i386 0:1.9-3.fc6 fribidi.i386 0:0.10.9-2.fc8 libcaca.i386 0:0.99-0.3.beta11.fc8 libdca.i386 0:0.0.5-2.lvn8 libdvdnav.i386 0:4.1.1-3.fc9 libdvdread.i386 0:4.1.1-3.fc9 libmpcdec.i386 0:1.2.6-3.fc8 lirc.i386 0:0.8.2-2.fc8 xvidcore.i386 0:1.1.3-1.lvn8
Complete!

alternative installation.
if you don't like easy install.
go to the mplayer official website http://www.mplayerhq.hu/
you will need download and install 3 component: sources, a set of binary codecs, and a skin if you want a graphical user interface