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| Name | M4V | MKV |
| Full name | M4V - Raw MPEG-4 | MKV - Matroska |
| File extension | .m4v | .mkv, .mk3d, .mka, .mks |
| MIME type | video/x-m4v | video/x-matroska, audio/x-matroska |
| Developed by | Apple Inc. | www.matroska.org |
| Type of format | Video container | Container format |
| Description | The M4V file format is a video container format developed by Apple and is very similar to the MP4 format. The primary difference is that M4V files may optionally be protected by DRM copy protection. Apple uses M4V to encode video files in its iTunes Store. | The Matroska Multimedia Container is an open standard free container format, a file format that can hold an unlimited number of video, audio, picture, or subtitle tracks in one file. It is intended to serve as a universal format for storing common multimedia content, like movies or TV shows. |
| Technical details | Unauthorized reproduction of M4V files may be prevented using Apple's FairPlay copy protection. A FairPlay-protected M4V file can only be played on a computer authorized (using iTunes) with the account that was used to purchase the video. | Matroska is similar in concept to other containers like AVI, MP4, or Advanced Systems Format (ASF), but is entirely open in specification, with implementations consisting mostly of open source software. |
| Associated programs | Apple iTunes, Apple QuickTime Player, Media Player Classic, K-Multimedia Player, RealPlayer, Zoom Player, VLC media player | VLC Media Player |
| Wiki | https://en.wikipedia.org/wiki/M4V | https://en.wikipedia.org/wiki/Matroska |