i know this has probably been covered countless time, but it's not in the sticky so here goes. why is it, that when i combine seven video clips, all about 3megs in size, i get a final product of 100megs?? converting to mpeg, btw, using vegas 5. vegas wants to by default, double the width and height of the vid, but even when i change the settings to match the original vids, my file is freakin huge. why is that? and what can i do about it. i thought mpeg was a compressed file type.