Sustainability of Digital Formats
Planning for Library of Congress Collections
Sustainability of Digital Formats
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| Introduction | Sustainability Factors | Content Categories | Format Descriptions | Contact | |
| Full name |
ISO/IEC FCD 14496-11, Information technology -- Coding of audio-visual objects -- Part 11: Scene description and application engine; ISO/IEC 14496-11/Amd 4, XMT & MPEG-J extensions. (formal name) eXtensible MPEG-4 Textual format, XMT (common name) |
| Description | Framework for representing MPEG-4 scene description using an XML textual syntax, to facilitate the creation and maintenance of MPEG-4 multimedia content, whether by human authors or by automated machine programs. The textual representation of MPEG-4 content has high-level abstractions, XMT-O (or XMT-Ω [omega]), that allow authors to exchange their content easily with other authors or authoring tools, while at the same time preserving semantic intent. XMT also has low level textual representations, XMT-A (or XMT-Α [alpha]), covering the full scope and function of MPEG-4. The high-level XMT-O is designed to facilitate interoperability with the Synchronized Multimedia Integration Language (SMIL) 2.0, and also with Extensible 3D specification, X3D, developed as the next generation of Virtual Reality Modeling Language (VRML). At this writing, the compiler of this document does not have a copy of Part 11 and its Amendment 4 in hand--it is at the not-yet-officially-published "enquiry stage"--and this description is based information in other Parts of ISO/IEC 14496 and Fernando Pereira and Touradj Ebrahimi's book cited in Useful references below. |
| Production phase | Initial- or middle-state format. |
| Relationship to other formats | |
| Based on | XML_SCHEMA |
| LC experience or existing holdings | |
| LC preference |
| Disclosure | Open standard. Developed by ISO technical program JTC 1/SC 29 (WG11), aka the Motion Picture Experts Group (MPEG). See http://www.iso.org/iso/en/stdsdevelopment/techprog/workprog/ TechnicalProgrammeSCDetailPage.TechnicalProgrammeSCDetail?COMMID=148. |
| Documentation | ISO/IEC FCD 14496-11, Information technology -- Coding of audio-visual objects -- Part 11: Scene description and application engine; ISO/IEC 14496-11/Amd 4, XMT & MPEG-J extensions. |
| Adoption | Unknown, but the ISO/IEC documentation status is in the pre-published 40 range: "enquiry stage." |
| Licensing and patent claims | Unknown. |
| Transparency | Unknown; textual representation likely to be transparent |
| Self-documentation | See MP4_FF_2 |
| External dependencies | Unknown or n/a |
| Technical protection considerations | See MP4_FF_2 |
| Video elements | |
| Normal rendering for video | n/a |
| Clarity (support for high image resolution) | n/a |
| Functionality beyond normal video rendering | n/a |
| Sound elements | |
| Fidelity (support for high audio resolution) | n/a |
| Support for multiple sound channels | n/a |
| Functionality beyond normal rendering for sound | n/a |
| Tag type | Value | Note |
| Filename Extension | xmt | |
| Internet Media Type | application/mpeg4-iod-xmt | From MIME Type Registration for MPEG-4 |
| Magic numbers | None, according to MIME Type Registration for MPEG-4 | |
| File type brand | unknown or n/a |
| General | The four file formats associated with the ISO/IEC 14496 family of specifications are: • MP4_FF_1, "version 1" from the 2001 edition of Part 1 • MP4_FF_2, "version 2," from Part 14 • MP4_FF_AVCE, for Advanced Video Coding extensions, from Part 15 • MP4_XMT, this document, "textual format" from Part 11 XMT is described in Chapter 6 of Fernando Pereira and Touradj Ebrahimi's The MPEG-4 Book (Upper Saddle River, NJ: IMSC Press, 2002), pp. 187-225. |
| History |
URLs
Print
• ISO/IEC FCD 14496-11, Information technology -- Coding of audio-visual objects -- Part 11: Scene description and application engine; ISO/IEC 14496-11/Amd 4, XMT & MPEG-J extensions.
URLs
• MIME Type Registration for MPEG-4 by Y Lim (net&tv) and D. Singer (Apple Computer), July 2004 (http://community.roxen.com/developers/idocs/drafts/draft-lim-mpeg4-mime-02.html)
Print
• Pereira, Fernando and Touradj Ebrahimi. The MPEG-4 Book. Upper Saddle River, NJ: IMSC Press, 2002.
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