Mplayer is a really good media program but the ony catch is it requires a good bunch of LIBs and extra RPMs, and sometimes the extra RPMs need LIBs of their own, lol, but if you get fed up with that try Totem Movie player. I installed that the other day and i was able to find all the extra LIBs and RPMs needed on google.com/linux in under an hour.. GL m8.
also, if you decide to do that contact me on AIM 'VidFromDiaspora' and since i have pretty much all the extras on my computer ill U/L them to my website and give you links to save ya the time searching..