Canopus does not put out vob's. It outputs dvd compliant mpegs, which can then be authored into .vob's for burning.
The above advice about splitting etc., does not apply.
Use a bitrate calculator to encode your files to fit on one dvdr.
I have no idea what you're on about DivX Pro. It has nothing to do with encoding to mpeg in Canopus. Canopus doesn't care if it's DivX, Xvid, or any other type of .avi, as long as you have the codec on your system.
In order to preserve as much quality as possible, you should NOT be saving an avi on your hard drive. Either capture directly to mpeg-2 in a dvd compliant aspect, or capture into an encoder that WILL output compliant mpegs.
I suggested virtualdub, because it will capture, it will edit/filter, and it will frameserve to Canopus, with no intermediate loss of quality, however, your ADVC-100 should work in conjunction with Canopus Procoder to produce the required mpeg-2 streams.
Load the mpegs into DVDLab, author, and burn.
Guides on this are in my sig below.