Just whan people whatch for this ;
In my case, in fc2 using yum install mplayer with livna repository will result dependency issue and can't get the package installed. Switch to freshrpms repository had enabled me installing the mplayer sucessful - but unfortunately no mplayerplug-in in this place so I had to download the rpm package from some other place.
Make sure you have the fedora.us repo included in your yum.conf! The livna repo shouldn't be used by itself. There is a big red box on the livna page that states:
"Important
RPM.Livna.org is not a standalone repository. You must use rpm.livna.org with the Fedora.us repository"
Further down the page, there is:
"Do not ask for help about missing libaa/libFLAC/liblzo/libdv/... dependencies. Configure your apt/yum/up2date to use the corresponding stable/testing/unstable repositories from fedora.us which you use from rpm.livna.org and it'll work."
I'm not intending to flame -- but just be sure you have the required fedora.us repo also in your yum.conf.
Hope this helps, Clint