M4V
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| Filename extension | .m4v |
|---|---|
| Internet media type | video/m4v |
| Developed by | Apple Inc |
| Container for | Audio, Video |
| Contained by | H.264, AAC and Dolby Digital |
| Extended from | iTunes video format |
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M4V files are iTunes Video Files. The M4V file format is a standard file format for videos for iPods and PlayStation Portables developed by Apple. Nowadays, Apple’s product like iPod, iPhone, and iTunes Store, are becoming more and more popular which enables M4V files are commonly used. M4V files format is based on the MPEG-4 AVC video codec, which is a global media standard with the aim to provide optimized video podcasts for the video 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’.
One incomparable merit of M4V format is that it can maintain image quality with small space size. Besides Apple iTunes and Apple QuickTime Player, M4V files can also be opened and played with Media Player Classic, RealNetworks RealPlayer, and VideoLAN VLC media player.
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