When I letterbox a regular VCD (352x240) I have no problems.

But when I do it with XVCD (352x480) I get a slight "bend" on the top side borders... I mean... the bottom black bar is perfectly straight, but the top bar has this slight deformation on the sides... it's not perfectly straight. It's totally "ignorable", but I was wondering if this is a normal problem and if it has a simple solution.

Thanks,
Christian