flickering tv-out with gf4
 

hello, i finally got my tv-out running with setting up an extra x-server for my tv.
now when i watch movies on the tv with xine i see some flickering horizontal lines that kinda distort the picture. this is especially when there is some fast action in the movie.
it looks similar to playing an opengl game without vertical synchronisation turned on what makes me think that it might have something to do with vsync...

i tested it on windoze where it works all fine so it shouldn't be a hardware problem.
my graphics card is a geforce4 ti4400 and i'm running rh9. xf86 is up to date.

thanks for any help, i'm really clueless..