you need the codecs pack...if u have SSH access type the following

Code:
cd /usr/local/src
wget http://www3.mplayerhq.hu/MPlayer/rel...061022.tar.bz2
tar jxvf essential-20061022.tar.bz2
mkdir /usr/local/lib/codecs/
mv /usr/local/src/essential-20061022/* /usr/local/lib/codecs/
chmod -R 755 /usr/local/lib/codecs/