Solution to run any media file type in fedora 12 ......
Install VLC on Fedora 12 Linux
Download and install
$ rpm -ivh http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm
$ yum install vlc
Now after installing vlc you can run all media file types on vlc and "totem movieplayer" (if missing codecs) click search and installs plug-ins from internet.
I didn't feel any problem to play video or audio files.