but I only want the 4:3 resolution to be cropped (not to be squeezed to 16:9) with no aspect ratio change in 16:9 display .
It works exactly this way using the option Rel has described above.
Are you using DVI output, or HDMI? Perhaps this is a problem...
also make an availability for fullscreen display in startup like progdvb , I use my pc as a reciever and everytime It starts up I should switch manually to fullscreen , Thanks alot.
This is possible already, it's in the Help:
Command line switches