Hmm... version 0.29-1 is for Gregale, which isn't really OS2006, is it? That version would be 1.14-1 I think. Looks like the mplayer isn't really build for OS2006 proper (?). In any case you could try to either download and install hildon-fm1 from http://repository.maemo.org/pool/gre...29-1_armel.deb
or possibly add
http://repository.maemo.org
gregale
free
to your repository list. Or maybe there's another mplayer for OS2006 as well. But as the date of that hildon-fm1 in the link is actually 2006 it just might work..