Network Working Group T. Edwards
Internet-Draft PBS
Expires: July 10, 2006 January 6, 2006
Media Type Registration for SMPTE Material Exchange Format (MXF)
draft-edwards-mime-mxf-01
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Copyright (C) The Internet Society (2006).
Abstract
This document serves to register a media type for the SMPTE Material
Exchange Format (MXF). MXF, defined by SMPTE 377M, is a standard
wrapper format developed for the interchange of audiovisual material,
including both audiovisual essence and rich metadata.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Security Considerations . . . . . . . . . . . . . . . . . . . . 3
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 3
3.1. Media Type for SMPTE Material Exchange Format (MXF) . . . . 3
4. RFC Editor Considerations . . . . . . . . . . . . . . . . . . . 5
5. References . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5.1. Normative References . . . . . . . . . . . . . . . . . . . 5
5.2. Informative References . . . . . . . . . . . . . . . . . . 5
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 5
Intellectual Property and Copyright Statements . . . . . . . . . . 5
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1. Introduction
The present document registers a media type for SMPTE Material
Exchange Format (MXF). MXF, defined by SMPTE 377M [SMPTE377M], is a
standard wrapper format developed for the interchange of audiovisual
material, including both audiovisual essence and rich metadata. MXF
is an important tool in providing interoperation between different
video systems as well as digital cinema systems. MXF also aids in
the development of video production and distribution workflows that
are more efficient, multi-vendor, file-based, and IT-oriented.
The media type defined here is needed to correctly identify MXF files
when they are served over HTTP or other network connections, included
in multi-part documents, indexed by operating systems and digital
asset management systems, or when used in other places where media
types are used.
2. Security Considerations
Security requirements for the application/mxf media type are
discussed in the IANA media type registration (Section 3.1).
3. IANA Considerations
The present document requests that IANA registers the media type
application/mxf as specified in Section 3.1. The registration uses
the template present in [RFC4288].
3.1. Media Type for SMPTE Material Exchange Format (MXF)
To: ietf-types@iana.org
Subject: Registration of media type application/mxf
Type name: application
Subtype name: mxf
Required parameters: none
Optional parameters: none
Encoding considerations: binary
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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: RFC XXXX, SMPTE 377M [SMPTE377M]
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. These include
non-linear editing systems, video servers, video camera systems,
digital asset management systems, and digital video distribution
systems.
Additional information:
Magic number(s): none
File extension(s): .mxf
Macintosh File Type Code(s): "mxf "
Person & email address to contact for further information:
Thomas Edwards
email: tedwards@pbs.org
Intended usage: COMMON
Restrictions on usage: none
Author/Change controller:
Thomas Edwards
email: tedwards@pbs.org
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4. RFC Editor Considerations
The reference to RFC XXXX in the media type registration
(Section 3.1) should be replaced with the actual RFC number of this
document when it is issued.
Please remove this section before publication as RFC.
5. References
5.1. Normative References
[SMPTE377M] Society of Motion Picture and Television Engineers,
"Material Exchange Format (MXF) File Format
Specification", SMPTE 377M-2004, <http://www.smpte.org>.
5.2. Informative References
[RFC4288] Freed, N. and J. Klensin, "Media Type Specifications and
Registration Procedures", BCP 13, RFC 4288, December 2005.
Author's Address
Thomas G. Edwards
PBS
1320 Braddock Place
Alexandria, VA 22314
US
Phone: +1 703 739 5000
Email: tedwards@pbs.org
URI: http://www.pbs.org
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