You need install and activate RpFusion and Livna
from terminal:
su (here you need write you root pasword)
Copy & Paste
yum localinstall --nogpgcheck http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpm
rpm -ivh http://rpm.livna.org/livna-release.rpm
After install all codecs
yum -y install gstreamer-plugins-bad gstreamer-plugins-bad-free-extras gstreamer-plugins-bad-nonfree gstreamer-plugins-ugly gstreamer-ffmpeg ffmpeg mencoder ffmpeg2theora mplayer libdvdcss
Or you can install easly with PostInstallerF