Alternative course of actions:
1) Uninstall and reinstall, make sure all dependencies are satisfied, it KPackage there is an option to test before install, if output is other than 0, do not install
2) Download KPlayer from freshmeat.net and try to install the rpm
3) There is a separate mplayer-gui program, download and install the rpm, test before install
4) Do not rely on mplayer, cause it is a large program, download the binary from
www.mplayerhq.hu along with skins, fonts, win32 codecs, read the instructions in the site, and install