is there a possibility for scaling the video to screen resolution or (if no other chance) to decrease the x server resolution to 320x240 during video?
I prefer starting mplayer from a terminal:
You could use fn+1 or fn+2 to scale the screen, and then start mplayer (not so easy, because the terminal window would be larger than screen size).
Otherwise, just do something like:
xrandr -s 1 ; mplayer -fstype fullscreen -fs <your_avi_file> ; xrandr -s 0
(first command set resolution to 320x200, second start mplayer, third bring resolution back to 640x480).
You can search other posts in this forum for more detailed discussion about watching divx on the zaurus (just to give the credits to who deserve it!).
Ciao,
Andrea
P.S. Sorry for my poor english!
P.P.S. For all the above I'm assuming you just want to watch divx, now watch divx with xmms at all costs If you want to use xmms, sorry for the wasted space in this thread