INTERNATIONAL ISO/IEC STANDARD 23009-1 Fifth edition 2022-08 Information technology Dynamic adaptive streaming over HTTP (DASH) - Part 1: Media presentation description and segment formats Technologies de I'information - Diffusion en flux adaptatif dynamique sur HTTP (DASH) Partie 1: Description de la présentation et formats de remise des medias Reference number EC IS0/IEC 23009-1:2022(E) ISO @ IS0/IEC 2022 IS0/IEC 23009-1:2022(E) COPYRIGHT PROTECTED DOCUMENT @IS0/IEC2022 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either Iso at the address below or Iso's memberbody inthe country of the requester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 0111 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0/IEC 2022 - All rights reserved IS0/IEC 23009-1:2022(E) Contents Foreword vii Introduction... .viii 2 Normativereferences Terms, definitions, symbols and abbreviated terms. 3.1 Terms and definitions.. 3.2 Symbols and abbreviated terms... 3.3 Conventions Overview 4.1 Systemdescription.. 10 4.2 DASH Client model... .11 4.4Protocols.... .15 4.5 Media stream and Representation properties ... .16 4.5.1 Switching and Random Access Support... 4.5.2 Media stream access points ... 4.5.3 Non-overlapping Segments and Subsegments .. 17 4.5.4 Conforming Segment track.... 4.6 Brands.... .18 4.7 Schemes. ..19 Media Presentation ... 22 5.1 General.... ..22 5.2.1 General ........ .22 5.2.2 Schema..... ..23 5.2.3 Elements and Attributes added in revisions and amendments.. 5.3 Hierarchical data model.... 26 5.3.1 General. .26 5.3.2 5.3.3 Adaptation Sets... 39 5.3.4 Media content component... 50 5.3.5 5.3.6 Sub-Representation .. 62 5.3.7 Common attributes and elements .. ..63 5.3.8 5.3.9 Segments and Segment information.... 71 5.3.10 Label and Group Label.. .93 5.3.11 Preselection... 5.3.12 Initialization Set, Group and Presentation.... ...99 5.3.13 Resynchronization.. .103 .4 Media Presentation Description updates..... 5.4.1 General.. 106 5.4.2 MPDReset. .108 5.5 MPD assembly. 5.5.1 General. 108 5.5.2 Syntax and semantics.. .108 5.5.3 5.6 Base URL Processing... 110 @ IS0 2022 - All rights reserved iii IS0/IEC 23009-1:2022(E) 5.6.1 Overview 110 5.6.2 Semantics 111 5.6.3 XML. syntax.... 5.6.4 Reference resolution.. 112 5.6.5 Alternative base URLs.... ..113 5.7.1 Overview ..... 113 5.7.2 Semantics ..113 5.7.3 5.8 Descriptors... .114 5.8.1 General.. ..114 5.8.2 5.8.3 XML syntax of generic descriptor.. .115 5.8.4 Specific descriptors... .116 5.8.5 5.9 DASH metrics descriptor ... 133 5.9.1 Overview... ..133 5.9.2 5.9.3 XML syntax... .134 5.9.4 Metric reporting .. ..135 5.10 5.10.1 Overview ... ..135 5.10.2 MPD Events. ..135 5.10.3 Inband Event Signalling 5.10.4 DASH-specific events.... ..142 5.11 MPD Chaining ... ..146 5.11.2 Regular Chaining ... ..146 5.11.3 Fallback Chaining... ..147 5.12 Producer Reference Time. 5.12.1 General .148 5.12.2 Semantics .148 5.13 Leap seconds.... ..150 5.13.1 0verview . .150 5.13.3 XML-Syntax.. ..151 5.13.4 Leap second information updates... ..152 5.14 5.14.1 General... .152 5.14.2 Semantics .153 5.14.3 XML syntax..... 5.15 MPD patch framework.... ..155 5.15.1 Overview.... ..155 5.15.3 MPD patch document... ..156 5.15.4 Processing Model ... ...158 6 Segment formats.... ..159 6.2 Segment types... .160 6.2.1 General.. .160 6.2.2 Initialization Segment 6.2.3 Media Segment.... iv @ IS0 2022 - All rights reserved IS0/IEC 23009-1:2022(E) 6.2.4 Index Segment 162 6.2.5 Bitstream Switching Segment . .162 6.2.6 .Missing Content Segment.... 6.3Segmentformatsforsobasemediafileformat.. 162 6.3.1 General ... 162 6.3.2 Preliminaries.. Refinements of generic