To play mp3 and DivX format movies on Fedora you need to install addtional plugins. To install this plugin you need to add rpmfusion-free-release repo, to do so run
rpm -ivh http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm
Now install plugins by yum,
yum install -y ffmpeg gstreamer-ffmpeg gstreamer-plugins-bad gstreamer-plugins-ugly
Now you can play avi movies without any hassle.
Totem plugins for mp3 & avi on Fedora