M4V files on Mac
iTunes is set as the default application for m4v files, to sync them with the iPod video.
M4V, MPEG-4 file extension used for videos downloaded from the Apple iTunes store; includes TV episodes, full-length movies, and music videos; similar to an .MP4 file, but may be copy-protected using Apple's FairPlay DRM copyright protection.
To play a protected M4V file, your computer must be authorized (using iTunes) with the account that was used to purchase the video.
Unprotected M4V files may be recognized and played by other video players by changing the file extension from ".m4v" to "mp4".
Play M4V files on Mac
To play a protected M4V file, your computer must be authorized (using iTunes) with the account that was used to purchase the video. Unprotected M4V files may be recognized and played by other video players by changing the file extension from ".m4v" to ".mp4." After the file extension rename, you can play the new files with iTunes. Moreover, QuickTime player is a good platform for all Mac users to play M4V video files.