I'll post here, because I'm not sure where a better place would be.

MPlayer doesn't scale correctly when the screen is rotated 90 degrees.

Here's a test video with the correct aspect ratio (400 high, 240 wide). Can anyone get it to fill the screen when the screen is rotated? Or is it just impossible due to limitations of maemo mplayer?

(EDIT: Here's what it should look like)

I think a much better idea is to report this problem to the maintainer(s) of the screen rotation patches. They need to verify if Xv extension works correctly (this can be done with some simple test programs), I remember that lcuk observed some problems with liqbase too.