Dvd codecs
This is how i installed the codec to play dvd's
The sed command disables the repo by default because there is no updates for libdvdcss so its not needed, also the livna repo isnt always reliable and could break yum.
su -
yum -y install --nogpgcheck http://rpm.livna.org/livna-release.rpm
sed -i 's/enabled=1/enabled=0/g' /etc/yum.repos.d/livna.repo
yum --enablerepo=livna -y install install libdvdcss