(RFC 4337 published March 2006, subtype last updated March 2006) MIME media type name: application MIME subtype name: mpeg4-iod-xmt Required parameters: none Optional parameters: none Encoding considerations: none Security considerations: See section 5 of RFC 4337. Interoperability considerations: A number of interoperating implementations exist within the ISO/IEC 14496 community, and that community has reference software for reading and writing the file format. Published specification: ISO/IEC 14496-1:2001 AMD2. Applications: Multimedia Additional information: Magic number(s): none File extension(s): mp4 and mpg4 are both declared at . Macintosh File Type Code(s): mpg4 is registered with Apple. Person to contact for info: David Singer, singer&apple.com Intended usage: Common Author/Change controller: David Singer, ISO/IEC 14496 file format chair