
This is a MIME media type registration for the Material Exchange Format (MXF) standard of the Society of Motion Picture and Television Engineers (SMPTE - http://www.smpte.org) MXF is a standard wrapper format developed for the interchange of audiovisual material, including both audiovisual essence and rich metadata. MXF and the .mxf file extension are used by many broadcast and digital cinema vendors today. The standard definition can be found in SMPTE 377M. Thomas Edwards Senior Manager, Interconnection Engineering Interconnection Replacement Office PBS 1320 Braddock Place Alexandria, VA 22314 Phone:(703) 739-5270 Fax: (703) 739-5770 Email: tedwards@pbs.org --------------- MIME media type name: application MIME subtype name: mxf Required parameters: none Optional parameters: none Encoding considerations: binary Security considerations: Application/mxf objects are not signed but may be partially encrypted internally. External security mechanisms must be employed to ensure content confidentiality. MXF, through metadata extensions, may allow executable code to be transferred in the file. It is suggested that no unauthenticated executables decoded from an MXF file be executed. Some compressed essence types carried in MXF may carry a risk that certain pathological bitstreams could lead to potential denial-of-service attacks against these essence decoders. Interoperability considerations: MXF provides a standard wrapping for a number of audio and video essence types according to a number of different Operational Patterns (OP). Thus interoperability depends upon the MXF file decoder having the capability to match the features of the MXF file encoder. An Application Specification (AS) can ensure that MXF encoders and decoders can effectively interoperate. Published specification: SMPTE 377M Applications which use this media type: MXF is a wrapper for many types of audio and video essence types in use by many applications in the broadcast and digital cinema industries. Additional information: Magic number(s): none File extension(s): .mxf Macintosh File Type Code(s): MXFF Object Identifier(s) or OID(s): none Person & email address to contact for further information: Thomas Edwards email: tedwards@pbs.org Intended usage: COMMON Author/Change controller: Thomas Edwards e-mail: tedwards@pbs.org ___________________________________________________________________ Big Big Friends are coming your way for Big Big Friend Day on PBS KIDS! On November 25th, join pals from CLIFFORD and DRAGON TALES For fun, surprises, and a peek at some brand new friends! pbskids.org ___________________________________________________________________ This email may contain material that is confidential or proprietary to PBS and is intended solely for use by the intended recipient. Any review, reliance or distribution of such material by others, or forwarding of such material without express permission, is strictly prohibited. If you are not the intended recipient, please notify the sender and destroy all copies. __________________________________________________________________