well as far as the video goes, you seriously have to stop using framebuffer, no wonder you can't even use xv
i woudl guess from here http://xfree86.org/4.2.0/Status28.html#28
that you want the "savage" driver. go install.
and the sound in mplayer, try using the SDL output, (-ao sdl) should have a much better chance of working. i know "-ao sdl:esd" works great.
xine... wouldn't know.. i only use decent software!