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Motion JPEG 2000

Motion JPEG 2000
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
Type of format moving image
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 15444-3:2007, ITU-T T.802
Website "Part 3 - Motion JPEG 2000". jpeg.org. Retrieved 22 June 2014. [dead link]

Motion JPEG 2000 (MJ2 or MJP2) is a file format for motion sequences of JPEG 2000 images and associated audio, based on the MP4/QuickTime format. Filename extensions for Motion JPEG 2000 video files are .mj2 and .mjp2 according to RFC 3745.

ISO Standards

MJ2, first defined by Part 3 of the ISO Standard for JPEG 2000 ISO/IEC 15444 in November 2001[1] (ISO/IEC 15444-3:2002) as a standalone document, has later been defined by ISO/IEC 15444-3:2007, ISO/IEC 15444-3:2007/Amd 1:2010, additional profiles for archiving applications, and by ISO/IEC 15444-12 which defines the JPEG 2000 base media format, which contains the timing, structure, and media information for timed sequences of media data.

The standard is available for download from ITU-T as their Recommendation T.802.[2]

MPEG vs MJ2

Motion JPEG2000 and MPEG were expected to coexist for the foreseeable future. Unlike MPEG, MJ2 did not involve inter-frame coding: each frame was coded independently using JPEG 2000. This made MJ2 more error-resilient and scalable - better suited to networked and point-to-point environments with additional advantages over MPEG with respect to random frame access.[3]

In cinematography, movies were recorded on film. To add digital special effects, the films had to be scanned, the special effects added, and then everything was recorded back to film. MJ2 was a packetized code stream that naturally has built-in error-protection, and markers could be added to further improve it. As a digital format, MJ2 was better suited than MPEG for cinematography that is fully digital, and almost all new films are filmed and released in digital format now.

See also

References

  1. "Motion JPEG 2000 Part 3". Joint Photographic Experts Group, JPEG, and Joint Bi-level Image experts Group, JBIG. Retrieved 21 June 2014. 
  2. "T.802 : Information technology - JPEG 2000 image coding system: Motion JPEG 2000". January 2005. Retrieved 21 June 2014. 
  3. Hunter, Jill. "Digital cinema reels from motion JPEG2000 advances". EETimes. EETimes. Retrieved 21 June 2014. 

External links