Depends on what files your DVD player can read. If you're looking for something that can be played on any DVD player, the movie files need to be in the .vob format. These are located in the VTS containers.
If you open the files on a standard DVD, you'll see two folders, an Audio TS and a Video TS folder. Inside the Video TS folder are the .vob files that make up the movie.
The M4V file format is a video file format developed by Apple. Apple uses M4V files to encode TV episodes, movies, and music videos in the iTunes Store. To play a protected M4V file, the computer needs to be authorized (using iTunes) with the account that was used to purchase the video.
Unprotected M4V files without AC3 audio MAY be recognized and played by other video players by changing the file extension from ‘.m4v’ to ‘.mp4’.
.m4v files can also be opened and played by some versions of Windows Media Player and RealPlayer.