mplayer vsync / frame rate matching

Hi there,

I'm using mplayer (via freevo) to watch TV from a dvb-T stream, and it's fine, 
apart from the fact that the frame rate isn't syncronised, so I get sheering 
and ghosting on things such as scrolling text, etc. which makes it difficult 
to read.

The card is plugged directly into a TV, via TV out, so the frame rates should 
match perfectly, if only mplayer could vsync!

I've tried using "-vo gl2", since I've configured my nvidia fx5700 to vsync in 
the opengl settings, but this doesn't have an effect.  The "-vsync" option 
apparently only works when using SVGA mode.

Anyone got any ideas?

Thanks,

Giles