I thought i would share this with you guys here (since i think most of you guys haven't seen this in the howto forum), i have seen previous posts here , on howto install/run 32bit applications on a 64bit install , with this method you can install and run 32bit mplayer/xine/totem-xine so it will be able to use all the 32bit codecs, as well as install the mplayerplug-in so you can view streaming media straight through firefox/mozilla. You can also install just about any other 32bit package that intrests you via this method . Just make sure x86_64 xmms is uninstalled. Now if a app requires(dependency) a 32bit package but you have a 64bit package installed, uninstall it, and install their 32bit versions. Here is the link to the howto:
http://forums.fedoraforum.org/showthread.php?t=83681