As far as I can remember, someone was saying how when he tried to start MPLAYER in the Sash X11 ROM it would give the error that libvorbisidec.so was missing and either segfault or just close itself.
He further went on to reply that he fixed this by removing that version of MPLAYER and installing an older version for the 5x00 series OZ rom from the OZ feed.
However, in light of this I went to fix it myself and found the missing files and am now hosting them on my website, you should be able to just extract them into the /home/root/usr/lib/ folder and it'll work from there on. The file is here: http://foxdie.timduru.org/zaurus/libvorbisidec.tar.gz
Please bear in mind that this is my FIRST time making a tarball / gzipped file so if there's problems please tell me.