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| Filename extension | .mj2,.mjp2 |
|---|---|
| Internet media type | video/mj2 |
| Magic number | 12 byte string: X'0000 000C 6A50 2020 0D0A 870A' |
| Developed by | Joint Photographic Experts Group |
| Initial release | December 2003; 21 years ago (2003-12) |
| Latest release | ISO/IEC 15444-3:2007/AMD 1:2010 October 2010; 14 years ago (2010-10) |
| Type of format | Video coding format |
| Container for | video, sound |
| Extended from | ISO base media file format |
| Extended to | Motion JPEG 2000 Simple Profile, Motion JPEG 2000 Motion Picture Archive Preservation Format Profile, Motion JPEG 2000 Motion Picture Archive Access Format Profile |
| Standard | ISO/IEC 15444-3, ITU-T T.802 |
| Open format? | Yes |
| Free format? | No[1] |
| Website | http://www.jpeg.org/jpeg2000/j2kpart3.html |
Motion JPEG 2000 (MJ2 or MJP2) is a file format for motion sequences ofJPEG 2000images and associatedaudio, based on theMP4 andQuickTime format. Filename extensions for Motion JPEG 2000 video files are.mj2 and.mjp2, as defined in RFC 3745.
MJ2, first defined by Part 3 of the ISO Standard for JPEG 2000 ISO/IEC 15444 in November 2001[2](ISO/IEC 15444-3:2002) as a standalone document, has later been defined byISO/IEC 15444-3:2007,ISO/IEC 15444-3:2007/Amd 1:2010, additional profiles for archiving applications, and byISO/IEC 15444-12 which defines the JPEG 2000base media format, which contains the timing, structure, and media information for timed sequences of media data.
The standard is available for download fromITU-T as theirRecommendation T.802.[3]
Motion JPEG2000 was always intended to coexist withMPEG. Unlike MPEG, MJ2 does not implementinter-frame coding; eachframe is coded independently using JPEG 2000. This makes MJ2 more resilient to propagation of errors over time, more scalable, and better suited to networked and point-to-point environments, with additional advantages over MPEG with respect to random frame access,[4] but at the expense of increased storage and bandwidth requirements.
From 1997 to 2000, theJPEG 2000image compression standard was developed by aJoint Photographic Experts Group (JPEG) committee chaired by Swiss-Iranian engineer Touradj Ebrahimi (later the JPEG president).[5] In contrast to the original 1992JPEG standard, which is adiscrete cosine transform (DCT) basedlossy compression format for staticdigital images, JPEG 2000 is adiscrete wavelet transform (DWT) based compression standard that could be adapted for motion imagingvideo compression with the Motion JPEG 2000 extension. JPEG 2000 technology was later selected as thevideo coding standard fordigital cinema in 2004.[6]
