I'm running DVDFab in order to obtain the dvdid files I need for my collection. I'm also aware it has a built in compression function that will shrink it down to either DVD5 or DVD9. I have two questions before I start using it on the rest of my DVD collection: 1) Is the DVD5 compression option in DVDFAB on the same level of quality that DVD Shrink would produce (which I've been using for years up till recently)? 2) I have ISO files that are already on my HDD. Can I use DVDFAB to shrink those to DVD5 size or will that only work for movies that DVDFAB rips originally?