your disk is probably dirty or scratched, clean it real well and try to rip again.
to test if your rip is going to work properly once burnt, open up dvdplayer and then select, File -> select VIDEO_TS folder and then open the folder of your movie, then fast forward through the movie. the player will stop fast forwarding if it hits a bad sector in the rip so you dont have to pay too much attention to it when it is fast forwarding.....
you can still compress and burn it if the rip has bad sectors, but it might just stop when playing it on a set top dvd player (at the point where the FF explanation i just gave above would show)