MPlayer 0.90rc5-3.2.2 FreeBSD 5.1 buffer flicking on dual screen

[Marc Hufschmitt]

I've tested the dual output on Xfree86 4.3 with my laptop (ATI radeon M9) 
with dual screen.

while mplayer can run two instances of mplayer on the same screen in 
singlehead mode, the video is flicking when one running on screen0 
(display :0.0) and another on screen 1 (:0.1). 

One can think it's a radeon-driver problem?