Post #5 answers your question
If you have 90 min of footage, it should fit onto a 4.7 GB single layer DVD just fine. You need to take the VOB files from the Video TS folder and dump those into Streamclip and then "demux" to M2V and AC3 files, which can be brought into DVD Studio Pro. If I ever have more than 4.7 GB of material in DVDSP, let's say it's 5.0, then I make my DVD in DVDSP and "build" - make a Video TS folder. Then take that Video TS folder and burn it in Toast in the area where it burns those kinds of folders (not as "DVD-Video"). Toast will crunch it down to fit onto the 4.7 GB disc and does a good job of it. There's a checkbox setting in that VTS Folder Burn command area that tells Toast that the folder is too big and Toast needs to crunch it down. If you want to use Final Cut Pro, you could get the footage into that (DV-QuickTime), and eventually into Compressor, however you are talking about some reencoding. Sometimes I would do that however as a tradeoff for being able to do some fine editing that is very hard to do while keeping it MPEG2.