ISO/IEC 14496-4:2004/Amd 2:2005

INTERNATIONAL ISO/IEC
STANDARD 14496-4
Second edition
2004-12-15
AMENDMENT 2
2005-04-15
Information technology — Coding of
audio-visual objects —
Part 4:
Conformance testing
AMENDMENT 2: MPEG-4 conformance
extensions for XMT and media nodes
Technologies de l'information — Codage des objets audiovisuels —
Partie 4: Essai de conformité
AMENDEMENT 2: Extensions de conformité pour XMT et nœuds
médias
Reference number
ISO/IEC 14496-4:2004/Amd.2:2005(E)
©
ISO/IEC 2005
ISO/IEC 14496-4:2004/Amd.2:2005(E)
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ii © ISO/IEC 2005 — All rights reserved

ISO/IEC 14496-4:2004/Amd.2:2005(E)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are members of
ISO or IEC participate in the development of International Standards through technical committees
established by the respective organization to deal with particular fields of technical activity. ISO and IEC
technical committees collaborate in fields of mutual interest. Other international organizations, governmental
and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information
technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of the joint technical committee is to prepare International Standards. Draft International
Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as
an International Standard requires approval by at least 75 % of the national bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
Amendment 2 to ISO/IEC 14496-4:2004 was prepared by Joint Technical Committee ISO/IEC JTC 1,
Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia
information.
© ISO/IEC 2005 — All rights reserved iii

ISO/IEC 14496-4:2004/Amd.2:2005(E)

Information technology — Coding of audio-visual objects —
Part 4:
Conformance testing
AMENDMENT 2: MPEG-4 conformance extensions for XMT and
media nodes
Add the following text at the end of Clause 4.
4.9 Extensible MPEG-4 Textual Format (XMT)
4.9.1 Conformance Points
XMT-A conformance points are:
• The XMT language: XMT-A ,
• SDSM and ODSM in mp4 produced from the XMT-A to mp4.
XMT-O conformance points are:
• The XMT language : XMT-O,
• SDSM and ODSM in mp4 produced from the XMT-O to mp4,
• Consumer behavior.
4.9.2 Measurement Procedure
XMT-A conformance can be measured by the following procedure:
1. Conformance on the format :
� Validate the syntax by the XML Schema parser against the XMT-A Schema
� Encode the format with a conforming encoder to mp4 and check its conformance.
2. Conformance on encoders: (A conforming encoder, respecting encoding hints, can produce a
deterministically coded binary stream for streams defined in MPEG-4 systems).
� Maintain a set of test cases and their corresponding bit streams (mp4 files) generated by the
conforming encoder.
� Test encoder generates mp4 files from the test cases.
� Run smart diff tool in mp4 space against mp4 files pair-wise. SDSM and ODSM in mp4 are
conformance points. Note: it's not necessarily the same mp4 file.
© ISO/IEC 2005 — All rights reserved 1

ISO/IEC 14496-4:2004/Amd.2:2005(E)
XMT-O conformance can be verified by the following procedure:
1. Conformance on the format:
� Validate the syntax by the XML Schema parser against the XMT-A Schema
� Encode the format with a conforming encoder to mp4 and check its conformance.
2. Conformance on encoders: (consumer behavior is verified).
� Maintain a set of test cases and their corresponding bit streams (mp4 files) generated by the
conform
...