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[edit]

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[edit]

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[edit]

• Motion JPEG

References[edit]

• digitalpreservation.gov Motion JPEG 2000 File Format Sustainability of Digital Formats - Planning for Library of Congress Collections

External links[edit]

• JPEG 2000 Official website, part 3 Motion JPEG 2000.
• Digital cinema reels from motion JPEG2000 advances
• OpenJPEG homepage open-source JPEG 2000 codec written in C language, developed to promote the use of JPEG 2000.
• Google Code page for OpenJPEG
• Documentation for the Openjpeg Motion JPEG 2000 utilities.

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