(per RFC3745) MIME media type name: video MIME subtype name: mj2 Required parameters: none Optional parameters: none Encoding considerations: files are binary and should be transmitted in a suitable encoding without CR/LF conversion, 7-bit stripping etc.; base64 is a suitable encoding; Security considerations: see above Interoperability considerations: A number of interoperating implementations exist within the MPEG-4 community with the formats derived from the ISO Base Media File Format; and that community has reference software for reading and writing the file format. Reference software for MJP2 is also available. Published specification: ISO/IEC 15444-3, Motion JPEG 2000 Applications: Multimedia Additional information: Magic number(s): 12 byte string: X'0000 000C 6A50 2020 0D0A 870A' (for all JPEG-2000 family files) File extension(s): mj2 and mjp2 are both declared at http://www.nist.gov/nics/; mj2 is preferred Macintosh File Type Code(s): mjp2 is registered with Apple Person to contact for info: David Singer, singer&apple.com Intended usage: Common Author/Change controller: David Singer, MJP2 file format editor