M4V files are iTunes Video Files. The M4V file format is a standard file format for videos for iPods developed by Apple. Nowadays, Apple's products like the iPod, iPhone, and iTunes Store, are becoming more and more popular so M4V files are becoming more commonly used[citation needed]. The M4V file format is based on the MPEG-4 AVC video compression, which is a global media standard with the aim to provide optimized video podcasts for the iPod.
M4V files are used for TV episodes, movies, and music videos in the iTunes Store. .M4V files are similar to .MP4 files, both of which are MP4 files. The difference is that M4V files are opened with iTunes player by default. MP4 files are opened with Quicktime player by default. The copyright of M4V files may be protected by using Apple's FairPlay DRM copyright protection. To play a protected M4V file, the computer needs to be authorized (using iTunes) with the account that was used to purchase the video. However, unprotected M4V files may be recognized and played by other video players by changing the file extension from '.m4v' to '.mp4'.
Besides Apple iTunes and Apple QuickTime Player, M4V files can also be opened and played with the version of Windows Media Player included with Windows 7, Media Player Classic, RealNetworks RealPlayer, VideoLAN VLC media player and Nero Showtime. The format, with DRM removed, can also be played in the webOS Video Player for use on the Palm Pre and Palm Pixi smartphones.
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