ISO/IEC 14496-12:2022

INTERNATIONAL ISO/IEC
STANDARD 14496-12
Seventh edition
2022-01
Information technology — Coding of
audio-visual objects —
Part 12:
ISO base media file format
Technologies de l'information — Codage des objets audiovisuels —
Partie 12: Format ISO de base pour les fichiers médias
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
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Published in Switzerland
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© ISO/IEC 2022 – All rights reserved

Contents Page
Foreword .x
Introduction .xi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviated terms . 2
3.1 Terms and definitions . 2
3.2 Abbreviated terms . 7
4 Object-structured file organization .7
4.1 File structure . 7
4.2 Object structure . 7
4.2.1 Object syntax conventions . 7
4.2.2 Object definitions . . 8
4.2.3 Extensibility of object definitions . 9
4.3 File-type box . 10
4.3.1 Definition . 10
4.3.2 Syntax . . 10
4.3.3 Semantics . 11
4.4 Extended type box . . . 11
4.4.1 Definition . 11
4.4.2 Syntax . . 11
4.4.3 Semantics . 11
5 Structure of this document .12
6 ISO base media file organization .12
6.1 Files, segments, and streams .12
6.2 Presentation structure . 13
6.2.1 Object structure of a presentation . 13
6.2.2 Meta data and media data . 13
6.3 Structure-data (objects) . 13
6.3.1 Box . .13
6.3.2 Data types and fields .13
6.3.3 URIs as type indicators . . 14
6.3.4 Box order .15
6.4 Time structure overview . 18
6.5 Identifiers . 19
6.6 Brand identification . 19
6.7 Uniform resource locators (URLs) . 19
7 Streaming support .19
8 Box structures .19
8.1 File structure and general boxes . 19
8.1.1 Media data box . 19
8.1.2 Free space box . 20
8.1.3 Progressive download information box . 20
8.1.4 Identified media data box . 21
8.2 Movie structure . 21
8.2.1 Movie box . 21
8.2.2 Movie header box . 21
8.3 Track structure . 23
8.3.1 Track box . 23
8.3.2 Track header box . 23
8.3.3 Track reference box. 26
8.3.4 Track group box . .28
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© ISO/IEC 2022 – All rights reserved

8.3.5 Track type box .29
8.4 Track media structure . 30
8.4.1 Media box .30
8.4.2 Media header box .30
8.4.3 Handler reference box . 31
8.4.4 Media information box . 32
8.4.5 Media information header boxes . 32
8.4.6 Extended language tag . 32
8.5 Sample tables . 33
8.5.1 Sample table box .33
8.5.2 Sample description box .34
8.5.3 Degradation priority box . 36
8.5.4 Sample scale box .36
8.6 Track time structures .36
8.6.1 Time to sample boxes .36
8.6.2 Sync sample box . 41
8.6.3 Shadow sync . 42
8.6.4 Independent and disposable samples box . 43
8.6.5 Edit box . 45
8.6.6 Edit list box . 45
8.7 Track data layout structures .
...