is this for "backing up" your movies?
if so use dvdbackup (dvdbackup -M /dev/dvd /mnt/storage) to get the disc to your hard drive w/o the messy encryption the movie companies bother us with.
then run dvd shrink in wine (wine dvdshrink.exe "d:/mnt/storgage/MOVIE_TITLE/VIDEO_TS/VIDEO_TS.IFO") to shrink movie to fit a dvd-5, also you can rip out extras/menus/languages, split dvd into multiple discs (with start/end points on multiple passes), and finally build iso...
then use k3b to burn dvd iso
fastest and most efficient way to "backup" dvd's that i've found so far. works awesome!