IEC International ISO Standard IS0/IEC23000-19 Information technology - Third edition 2024-02 Multimedia application format (MPEG-A) - Part 19: Common media application format (CMAF) for segmented media Technologies de I'information Format pour application multimeédia (MPEG-A) - Partie 19: Format CMAF (Common Media Application Format) pourmediassegmentés Referencenumber IS0/IEC 23000-19:2024(en) IS0/IEC 2024 IS0/IEC23000-19:2024(en) COPYRIGHT PROTECTED DOCUMENT IS0/IEC2024 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 orIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 401 · Ch.de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland @ IS0/IEC 2024 - All rights reserved ii IS0/IEC 23000-19:2024(en) Contents Page @ Foreword. Introduction ..viii 1 Scope. 2 Normative references .1 3 Terms and definitions. 3 3.1 Media objects. .3 3.2 Logical structure 3 3.3 Application model 5 4 Abbreviated terms. 6 5 Document organization 9 6 CMAF hypothetical application model, media object model and profiles .9 6.1 Overview of the hypothetical application model and media object model 9 6.2 CMAF content processing model .10 6.3 Late binding CMAF track synchronization. 11 6.4 Adaptive switching of CMAF tracks in CMAF switching sets 12 6.5 CMAF specified objects and profiles. 13 6.5.1 Object derivation and interoperability code points. 13 6.5.2 Encoded media objects. 13 6.5.3 Logical media object sets 13 6.5.4 Addressable media objects 13 6.5.5 CMAF profiles, brand and identifiers .14 6.6 CMAF media object model. 15 6.6.1 CMAF fragments. 15 6.6.2 CMAF tracks. .16 6.6.3 CMAF track files .16 6.6.4 CMAF segments .17 6.6.5 CMAF chunks... .17 6.6.6 CMAF switching sets and adaptive switching .18 6.6.7 CMAF selection sets and late binding 21 6.6.8 CMAF presentation timing model. 22 6.6.9 Manifest information. 24 6.6.10 CMAF addressable media objects, resources, and resource identifiers. 24 7 CMAF track format. 25 7.1 Overview. 25 7.2 CMAF brands 25 7.3 CMAF media objects 27 7.3.1 CMAFboxes. 27 7.3.2 CMAF track media objects 29 7.3.3 CMAF addressable media objects. 34 7.3.4 CMAF switching sets. 35 7.3.5 CMAF selection sets. 38 7.3.6 CMAF presentations. 38 7.4 Additional boxes, not defined in the Iso Base Media File Format 39 7.4.1 Track Encryption Box (‘tenc') 39 7.4.2 Sample Encryption Box ('senc') 39 7.4.3 Protection System Specific Header Box ('pssh') 39 7.4.4 Media profile specific boxes 40 7.4.5 Event Message Box ('emsg') 40 7.5 Constraints on Iso Base Media File Format boxes. 40 7.5.1 Movie Header Box ('mvhd') 40 7.5.2 Metadata Boxes. 40 7.5.3 Kind Box (kind') .41 @ IS0/IEC 2024 - All rights reserved iii IS0/IEC 23000-19:2024(en) 7.5.4 Track Header Box (tkhd') 41 7.5.5 Media Header Box (mdhd') 41 7.5.6 Video Media Header Box (vmhd) .42 7.5.7 Sound Media Header Box (' smhd') .42 7.5.8 Subtitle Media Header Box ('sthd') 42 7.5.9 DataReferenceBox(dref) 42 7.5.10 Sample Description Box ('stsd') 42 7.5.11 ProtectionSchemeInformation Box(sinf') 42 7.5.12 Track contained media sample information boxes 42 7.5.13 Edit List Box (elst') 43 7.5.14 Track Extends Box (trex' 43 7.5.15 Movie Fragment Header Box ('mfhd') 43 7.5.16 Track Fragment Header Box ('tfhd') 44 7.5.17 Track Run Box (‘trun') 44 7.5.18 Sample Group Description Box (' sgpd') 44 7.5.19 Media Data Box ('mdat') 45 7.5.20 Sub-sample Information Box ('subs') .45 7.6 The Structural CMAF Brand 'cmfc' 45 7.7 The structural CMAF Brand 'cmf2' 45 7.7.1 General 45 7.7.2 Edit List Box ('elst') .45 7.7.3 Track Run Box (‘trun') .45 8 Common encryption of CMAF tracks 46 8.1 Multiple