ISO/IEC 23000-19:2018

INTERNATIONAL ISO/IEC
STANDARD 23000-19
First edition
2018-01
Information technology — Multimedia
application format (MPEG-A) —
Part 19:
Common media application format
(CMAF) for segmented media
Technologies de l'information — Format pour application multimédia
(MPEG-A) —
Partie 19: Format CMAF (Common Media Application Format) pour
médias segmentés
Reference number
©
ISO/IEC 2018
© ISO/IEC 2018
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Published in Switzerland
ii © ISO/IEC 2018 – All rights reserved

Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviated terms . 6
5 Document organization . 6
6 CMAF hypothetical application model, media object model, and profiles .7
6.1 Overview of the hypothetical application model and media object model . 7
6.2 CMAF content processing model . 9
6.3 Late binding CMAF track synchronization .10
6.4 Adaptive switching of CMAF tracks in CMAF switching sets .11
6.5 CMAF specified objects and profiles.12
6.5.1 Object derivation and interoperability code points .12
6.5.2 Encoded media objects . .12
6.5.3 Logical media object sets .12
6.5.4 Addressable media objects .12
6.5.5 CMAF profiles, brand, and identifiers .13
6.6 CMAF media object model .14
6.6.1 CMAF fragments .14
6.6.2 CMAF tracks .15
6.6.3 CMAF track files .15
6.6.4 CMAF segments . .16
6.6.5 CMAF chunks . .16
6.6.6 CMAF switching sets and adaptive switching .17
6.6.7 CMAF selection sets and late binding .20
6.6.8 CMAF presentation timing model .21
6.6.9 Manifest information.23
6.6.10 CMAF addressable media objects, resources, and resource identifiers .24
7 CMAF track format .24
7.1 Overview .24
7.2 CMAF brands.24
7.3 CMAF media objects .25
7.3.1 CMAF boxes .25
7.3.2 CMAF track media objects .28
7.3.3 CMAF addressable media objects .32
7.3.4 CMAF switching sets .34
7.3.5 CMAF selection sets . .37
7.3.6 CMAF presentations .38
7.4 Additional boxes, not defined in the ISO Base Media File Format .38
7.4.1 Track Encryption Box ('tenc') .38
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 .39
7.4.5 Event Message Box ('emsg').39
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') .40
7.5.4 Track Header Box ('tkhd') .40
7.5.5 Media Header Box ('mdhd') .41
7.5.6 Video Media Header Box ('vmhd') .41
© ISO/IEC 2018 – All rights reserved iii

7.5.7 Sound Media Header Box ('smhd') .41
7.5.8 Subtitle Media Header Box ('sthd') .41
7.5.9 Data Reference Box ('dref') .42
7.5.10 Sample Description Box ('stsd') .42
7.5.11 Protection Scheme Information 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') .44
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') .45
7.5.19 Media Data Box ('mdat') .45
7.5.20 Sub-sample Information Box ('subs') .45
8 Common Encryption of CMAF tracks .45
8.1 Multiple DRM system support .45
8.2 Track encryption .46
8.2.1 General requirements .46
8.2.2 CMAF track constraints .47
8.2.3 Encryption constraints .48
8.2.4 CMAF presentation encryption .49
9 Video CMAF tracks .49
9.1 Overview .49
9.2 General video CMAF track format .50
9.2.1 General video CMAF track structure and constraints .50
9.2.2 Video Media Header ('vmhd') .50
9.2.3 Track Header Box ('tkhd') .51
9.2.4 Sample Description Box ('stsd') .51
9.2.5 Video CMAF fragment presentation time .
...