M4V is a video format mostly used with iPod. A DVD must be converted to an M4V file in order to view it on your iPod.Step by Step Guide: Rip DVD to M4V for Mac
Step 1: Launch DVD Ripper for Mac and add DVD Movie
Drag & drop DVD disc icon 
on the desktop to the program. Or go to "File" menu, choose "Load DVD" to locate the DVD movies (support commercial DVD movies and homemade DVDs) you want to add.
Step 2: Choose a video output format
Choose Video Formats - M4V if you just want to rip DVD to M4V on Mac OS X.
Step 3 : Start DVD to M4V Ripping on Mac OS X
Click the "Start" button to start converting DVD to M4V for Mac with this powerful DVD to M4V Converter for Mac.
This smart DVD ripping software can shut down your Mac automatically when the ripping is done.
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Here just show you the process of DVD to M4V for Mac, it can also rip DVD to SWF for Mac, DVD to VOB for Mac, DVD to WAV for Mac.
