Actually it was Bashar that suggested him to Read ErMaC & AbsoluteDestiny's Friendly AMV Guides Lovingly Overhauled Largely by Zarxrax
this time. XD
But! As far as resizing calculations from DVD go, use THIS calculator instead:http://ps-auxw.de/cgi-bin/ar-calc.pl
If you're doubtful on its usage do ask here. The calculator on org doesn't account for active area I believe, and in fact I think it was removed from more recent versions of the guide (that link Miya posted is from an old and unsupported version of the guide). The current guide just tells to use the AR calculator in avspmod, which I am not sure if it accounts for active area or not, but is a different calculator all the same.