Here's a poser for the very MPEG-technically astute. To create a 16:9 Enhanced DVD using non-commercial (aka less than $1,000) software like Sonic's DVDit and pre-generated MPEG-2 files, those files need to be "flagged" within the datastream as 16:9 files, even though a file of the same resolution can be used in a 4:3 project. I've been trying to convert non-16:9 files to 16:9 with TMPGenc, but I've not had a lot of luck. This whole concept that an MPEG-2 file must be "flagged" really bothers me because, whether it's flagged or not, the MPEG-2 file still uses the same resolution of 720x480. So, the concept that one 720x480 MPEG-2 is not flagged and is therefore unacceptable yet somehow a flagged 720x480 MPEG-2 *is* acceptable for 16:9 Enhanced projects really is more than a little strange to me. When all other things are equal (resolution, video bit rate, audio bit rate, etc), I cannot understand how a simple flag can so drastically change an MPEG-2 file as to allow it to be a part of a 16:9 project or conversely deny its ability to be in a 16:9 project. How exactly do 16:9 MPEG-2 files differentiate themselves from non-16:9 MPEG-2 files and why is it such a big deal? Anyone? Anyone? Beuller?