You may want to do a search on the Apple TV and Home Theater Forum. A lot of good information there.
https://forums.macrumors.com/forums/100/
https://forums.macrumors.com/forums/100/
DVDShrink to strip off everything from the DVD (menus, foreign audio tracks, ect) and rip to computer.
Handbrake to encode to iPhone format at appropriate resolution/framerate ect.
I use handbrake, but if I have a video file in an avi format, I use isquint.
Converting using handbrake is taking FOOOORRRREEEEVVVVEEERRRR somewhere around 4 hours minimum.