ISO/IEC 23009-2:2020

INTERNATIONAL ISO/IEC
STANDARD 23009-2
Third edition
2020-09
Information technology — Dynamic
adaptive streaming over HTTP
(DASH) —
Part 2:
Conformance and reference software
Technologies de l'information — Diffusion en flux adaptatif
dynamique sur HTTP (DASH) —
Partie 2: Conformité et logiciel de référence
Reference number
©
ISO/IEC 2020
© ISO/IEC 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii © ISO/IEC 2020 – All rights reserved

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms . 1
4 Media presentation conformance. 1
4.1 Overview . 1
4.2 Software tools . 2
5 MPD conformance . 2
5.1 General . 2
5.2 Static MPD conformance . 3
5.3 Dynamic MPD conformance . 4
5.3.1 General. 4
5.3.2 Background and requirements . 4
5.3.3 Dynamic conformance software design . 6
5.4 Conformance checks for spatial relationship description . 7
6 Segment conformance . 8
6.1 Overview . 8
6.2 Representation conformance . 9
6.2.1 ISO base media file format. 9
6.2.2 MPEG-2 transport stream .10
6.3 Adaptation set conformance .13
6.3.1 ISO base media file format.13
6.3.2 MPEG-2 transport stream .14
6.4 Dynamic media presentation conformance .16
7 Profile specific conformance .16
7.1 ISO base media file format on demand profile .16
7.2 ISO base media file format live profile .16
7.3 ISO base media file format main profile .16
7.4 MPEG-2 transport stream simple profile .17
8 Conforming test vectors .17
9 DASH access engine reference software .17
9.1 General .17
9.2 libdash overview .17
9.3 libdash-enabled example system .18
9.4 libdash availability .19
10 Conformance software for ISO/IEC 23009-4 .19
10.1 General .19
10.2 Design limitations and assumptions .19
10.3 Usage.19
11 Conformance for ISO/IEC 23009-5 server and network-assisted DASH (SAND) .20
11.1 Conformance rules .20
11.2 Software .23
11.2.1 Design and architecture .23
11.2.2 Usage .24
11.3 Test vectors .28
12 Conformance for ISO/IEC 23009-6 server push .28
12.1 Architecture .28
12.2 Status .29
© ISO/IEC 2020 – All rights reserved iii

12.3 Logistics .30
12.4 Usage.31
Annex A (normative) MPD conformance checking .32
Annex B (normative) Test vectors .74
Annex C (informative) Sample software .79
Annex D (informative) Dynamic media presentation emulator .82
Annex E (informative) Coverage of DASH features .83
Bibliography .87
iv © ISO/IEC 2020 – All rights reserved

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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for
the different types of document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
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. Details of any patent rights identified during the development of the document will be in the
Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see: www .iso
.org/ iso/ foreword .html.
This document was prepared by Joint Techncial Committee ISO/IEC JTC 1, Information technology, SC 29,
Coding of audio, picture, multimedia and hypermedia information.
This third edition cancels and replaces the second edition (ISO/IEC 23009-2:2017), which has been
technically revised.
The main changes compared to the previous edition are as follows:
a) Test vectors, conformance and reference software to cover all the features of ISO/IEC 23009-5,
including:
— SAND HTTP conformance client;
— SAND HTTP conformance server;
— SAND WebSocket conformance server.
b) Test vecors, conformance and reference software to cover all the features of ISO/IEC 23009-6,
including:
— Command line tool to validate of ABNF grammars.
A list of all parts in the ISO/IEC 23009 series can be found on the ISO website.
© ISO/IEC 2020 – All ri
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