I remember having to execute more than a couple commands to get the codecs I wanted.
Post up your two commands to download the repository and install the codecs and I’ll give it a shot. I’ll install Fedora 15 in a VM right quick so we can start with a clean install.
su -c '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'
2. Install the codecs: yum install gstreamer-plugins-bad gstreamer-ffmpeg gstreamer-plugins-ugly xine xine-lib libdvdcss xine-lib-extras-freeworld -y
That should do the trick for plugins as well as xine and amarok. Note: I didn't actually type all this out. These commands are found on the net, and you can copy and paste them into a terminal.