A Dvd Compression Tool

Hello again…
im back with my next question…
i have a Dvd movie(*.VOB) which is a movie of 4.2 GB size…I dont want to waste a whole Blank DVD for that movie…So im trying to compress it into a size some where between 2- 2.5 Gb(With acceptable compromise in video quality)…Can anyone suggest a dvd compression software…

my computers details…

Open suse 11.1
Gnome…
Thanks…

Get the video out in one stream .mpg
To rip a DVD to a mpeg2 single file:

mplayer dvd://1 -dumpstream -dumpfile movie.mpg

then use devede (from Packman repo) to create a new dvd
Default bit rate will be 5001 - change it to about 2500

Check also dvd95 and dvdshrink