Hi Corona688,
Thanks for your reply.
My system is Debian Squeeze.
I'm trying to display firefox through an X window.
Avisynth looks like what I need.
On the other hand, what I'm trying to achieve is far too complicated and we're hiring another company to do it : At the very end, we have one video projector and a weird screen that is made of three parts with different inclines. So I wanted to create 3 X windows and distort each one so that it matches the corresponding part of the screen. That's also why your very smart last advice wouldn't work for me
.
Regards
Santiago