1、Information technology Dynamic adaptive streaming over HTTP(DASH)Part 1:Media presentation description and segment formatsTechnologies de linformation Diffusion en flux adaptatif dynamique sur HTTP(DASH)Partie 1:Description de la prsentation et formats de remise des mdiasINTERNATIONAL STANDARDISO/IE
2、C 23009-1Fifth edition 2022-08Reference number ISO/IEC 23009-1:2022(E)ISO/IEC 2022iiISO/IEC 23009-1:2022(E)COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2022All rights reserved.Unless otherwise specified,or required in the context of its implementation,no part of this publication may be reproduced or utilize
3、d 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 ISOs member body in the country of the requester.ISO copyright office
4、CP 401 Ch.de Blandonnet 8CH-1214 Vernier,GenevaPhone:+41 22 749 01 11Email:copyrightiso.orgWebsite:www.iso.orgPublished in Switzerland ISO/IEC 2022 All rights reserved ISO/IEC 23009-1:2022(E)ISO 2022 All rights reserved iii Contents Foreword.vii Introduction.viii 1 Scope.1 2 Normative references.1 3
5、 Terms,definitions,symbols and abbreviated terms.2 3.1 Terms and definitions.2 3.2 Symbols and abbreviated terms.7 3.3 Conventions.9 4 Overview.10 4.1 System description.10 4.2 DASH Client model.11 4.3 DASH data model overview.12 4.4 Protocols.15 4.5 Media stream and Representation properties.16 4.5
6、.1 Switching and Random Access Support.16 4.5.2 Media stream access points.16 4.5.3 Non-overlapping Segments and Subsegments.17 4.5.4 Conforming Segment track.18 4.6 Brands.18 4.7 Schemes.19 5 Media Presentation.22 5.1 General.22 5.2 Media Presentation Description.22 5.2.1 General.22 5.2.2 Schema.23
7、 5.2.3 Elements and Attributes added in revisions and amendments.24 5.3 Hierarchical data model.26 5.3.1 General.26 5.3.2 Period.33 5.3.3 Adaptation Sets.39 5.3.4 Media content component.50 5.3.5 Representation.51 5.3.6 Sub-Representation.62 5.3.7 Common attributes and elements.63 5.3.8 Subsets.70 5
8、.3.9 Segments and Segment information.71 5.3.10 Label and Group Label.93 5.3.11 Preselection.95 5.3.12 Initialization Set,Group and Presentation.99 5.3.13 Resynchronization.103 5.4 Media Presentation Description updates.106 5.4.1 General.106 5.4.2 MPD Reset.108 5.5 MPD assembly.108 5.5.1 General.108
9、 5.5.2 Syntax and semantics.108 5.5.3 Processing.109 5.6 Base URL Processing.110 ISO/IEC 23009-1:2022(E)iv ISO 2022 All rights reserved 5.6.1 Overview.110 5.6.2 Semantics.111 5.6.3 XML syntax.112 5.6.4 Reference resolution.112 5.6.5 Alternative base URLs.113 5.7 Program information.113 5.7.1 Overvie
10、w.113 5.7.2 Semantics.113 5.7.3 XML syntax.114 5.8 Descriptors.114 5.8.1 General.114 5.8.2 Semantics of generic descriptor.115 5.8.3 XML syntax of generic descriptor.115 5.8.4 Specific descriptors.116 5.8.5 Specific scheme definitions.122 5.9 DASH metrics descriptor.133 5.9.1 Overview.133 5.9.2 Sema
11、ntics.133 5.9.3 XML syntax.134 5.9.4 Metric reporting.135 5.10 Events.135 5.10.1 Overview.135 5.10.2 MPD Events.135 5.10.3 Inband Event Signalling.139 5.10.4 DASH-specific events.142 5.11 MPD Chaining.146 5.11.1 General.146 5.11.2 Regular Chaining.146 5.11.3 Fallback Chaining.147 5.12 Producer Refer
12、ence Time.148 5.12.1 General.148 5.12.2 Semantics.148 5.12.3 XML Syntax.150 5.13 Leap seconds.150 5.13.1 Overview.150 5.13.2 Semantics.151 5.13.3 XML-Syntax.151 5.13.4 Leap second information updates.152 5.14 Content Popularity Rate.152 5.14.1 General.152 5.14.2 Semantics.153 5.14.3 XML syntax.154 5
13、.15 MPD patch framework.155 5.15.1 Overview.155 5.15.2 MPD Patch Location.155 5.15.3 MPD patch document.156 5.15.4 Processing Model.158 5.15.5 Recommended Client Operation.159 6 Segment formats.159 6.1 General.159 6.2 Segment types.160 6.2.1 General.160 6.2.2 Initialization Segment.160 6.2.3 Media S
14、egment.160 ISO/IEC 23009-1:2022(E)ISO 2022 All rights reserved v 6.2.4 Index Segment.162 6.2.5 Bitstream Switching Segment.162 6.2.6 Missing Content Segment.162 6.3 Segment formats for ISO base media file format.162 6.3.1 General.162 6.3.2 Preliminaries:Refinements of generic concepts.163 6.3.2.5 Re
15、synchronization Point.163 6.3.3 Initialization Segment format.164 6.3.4 Media Segment types.164 6.3.5 Self-Initializing Media Segment formats.166 6.4 Segment formats for MPEG-2 transport streams.166 6.4.1 General.166 6.4.2 Preliminaries:Refinements of generic concepts.167 6.4.3 Initialization Segmen
16、t types and formats.168 6.4.4 Media Segment types and formats.169 6.4.5 Bitstream Switching Segment.169 6.4.6 Index Segment.170 6.4.7 Boxes used with MPEG-2 TS Index Segments.172 7 Combined semantics of MPD and Segment formats.172 7.1 Overview.172 7.2 General.173 7.2.1 Media Presentation timeline.173 7.2.2 Segment Index.174 7.2.3 Segment alignment.174 7.2.4 Subsegment alignment.174 7.3 Media Presentation based on the ISO base media file format.174 7.3.1 General.174 7.3.2 Media presentation timel
