ISO/IEC 23009-8:2022

Information technology — Dynamic adaptive streaming over HTTP (DASH) — Part 8: Session-based DASH operations

This document specifies the format of the Session-Based Description document and the MPD's extension to be used in session-based operations with MPEG DASH (ISO/IEC 23009-1).

Technologies de l'information — Diffusion adaptative dynamique sur HTTP (DASH) — Partie 8: Opérations de DASH basées sur la session

General Information

• Status: Published
• Publication Date: 14-Feb-2022
• ICS: 35.040.40 - Coding of audio, video, multimedia and hypermedia information
• Technical Committee: ISO/IEC JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information
• Drafting Committee: ISO/IEC JTC 1/SC 29/WG 3 - MPEG Systems
• Current Stage: 9599 - Withdrawal of International Standard
• Start Date: 04-Aug-2025
• Completion Date: 09-Aug-2025

Relations

• Revised: ISO/IEC 23009-8:2025 - Information technology — Dynamic adaptive streaming over HTTP (DASH) — Part 8: Session-based DASH operations
• Effective Date: 13-Aug-2022

Standards Content (Sample)

INTERNATIONAL ISO/IEC
STANDARD 23009-8
First edition
2022-02
Information technology — Dynamic
adaptive streaming over HTTP
(DASH) —
Part 8:
Session-based DASH operations
Technologies de l'information — Diffusion adaptative dynamique sur
HTTP (DASH) —
Partie 8: Opérations de DASH basées sur la session
Reference number
© ISO/IEC 2022
© ISO/IEC 2022
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 member body in the country of the requester.
ISO copyright office
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Website: www.iso.org
Published in Switzerland
ii
© ISO/IEC 2022 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, abbreviated terms and notations . 1
3.1 Terms and definitions . 1
3.2 Abbreviated terms . 2
3.3 Notation . 2
4 General overview .3
4.1 Sessions and session parameters. 3
4.2 General architecture . 3
4.3 Timeline and orderline addressing . 4
5 MPD signalling for SBD . .4
5.1 General . 4
5.2 SBD descriptor . 5
5.2.1 General . 5
5.2.2 Semantics . 5
5.2.3 XML schema . 5
6 SBD document format . 6
6.1 Overview . 6
6.2 KeyValue Object . 6
6.2.1 Semantics . 6
6.2.2 JSON schema . 9
7 Client operation .13
7.1 Normative requirements .13
7.2 Processing model (informative) . 13
7.2.1 Building SBD timeline/orderline table . 13
7.2.2 Parameter value derivation . 14
7.2.3 Segment request . 14
8 Examples .14
8.1 General . 14
8.2 MPD . . 14
8.3 Session-based description document . 15
8.3.1 Example 1: Timeline .15
8.3.2 Example 2: Orderline .15
8.4 Operation . 16
9 Example applications – Forensic watermarking .16
Annex A SBD MIME type .18
Bibliography .19
iii
© ISO/IEC 2022 – 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 or
www.iec.ch/members_experts/refdocs).
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) or the IEC
list of patent declarations received (see https://patents.iec.ch).
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. In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information.
A list of all parts in the ISO/IEC 23009 series can be found on the ISO and IEC websites.
Any feedback or questions on this document should be directed to the user’s national standards
body. A complete listing of these bodies can be found at www.iso.org/members.html and
www.iec.ch/national-committees.
iv
© ISO/IEC 2022 – All rights reserved

Introduction
Dynamic adaptive streaming over HTTP (DASH) enables media-streaming model for delivery of
media content in which control lies exclusively with the client. Clients may request data using the
HTTP protocol from standard web servers that have no DASH-specific capabilities. Consequently, the
ISO/IEC 23009 series focuses not on client or server procedures but on the data formats used to provide
a DASH Media Presentation.
This document provides methods, interfaces and data for session-based operations to be used with the
DASH standard. Session-based operations allows customization of requested segment URLs based on
the information provided for a specific streaming session.
v
© ISO/IEC 2022 – All rights reserved

INTERNATIONAL STANDARD ISO/IEC 23009-8:2022(E)
Information technology — Dynamic adaptive streaming
over HTTP (DASH) —
Part 8:
Session-based DASH operations
1 Scope
This document specifies the format of the Session-Based Description document and the MPD's extension
to be used in session-based operations with MPEG DASH (ISO/IEC 23009-1).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO/IEC 23009-1:2019, Information technology — Dynamic adaptive streaming over HTTP (DASH) —
Part 1: Media presentation description and segment formats
IETF RFC 7230, Hypertext Transfer Protocol — HTTP/1.1, June 2014
IETF RFC 3986, Uniform Resource Identifier (URI): Generic Syntax, January 2005
IETF RFC 8259, The JavaScript Object Notation (JSON) Data Interchange Format, December 2017
3 Terms, definitions, abbreviated terms and notations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1.1
SBDStart
starting time of the session-based description
3.1.2
session
sequence of DASH client actions resulting in a unique playback of a media asset
3.1.3
session-based description
collection of timed key-value pairs providing a value given a time range within the session
3.1.4
session-based client
client capable of parsing SBD and adding queries to the DASH segment requests accordingly
© ISO/IEC 2022 – All rights reserved

3.1.5
sidecar document
document that stores data which is not supported by the format of the main document
3.2 Abbreviated terms
DASH dynamic adaptive streaming over HTTP, as specified in ISO/IEC 23009-1
HTTP hypertext transfer protocol, as specified in RFC 7230 (HTTP/1.1).
HTTPS secure version of the hypertext transfer protocol
ISO-BMFF ISO Base Media File Format, as specified in ISO/IEC 14496-12
MIME multipurpose internet mail extensions, as specified in RFC
...