ISO/IEC INTERNATIONAL STANDARD 14496-12 Seventh edition 2022-01 Information technology Coding of audio-visual objects - Part 12: Iso base media file format Technologies de I'informationCodage des objetsaudiovisuels- Partie 12: Format IsO de base pour les fichiers medias Reference number IEC IS0/IEC 14496-12:2022(E) (s 4 @IS0/IEC2022 IS0/IEC14496-12:2022(E) COPYRIGHTPROTECTEDDOCUMENT @IS0/IEC2022 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 CP401·Ch.deBlandonnet8 CH-1214 Vernier,Geneva Phone: +41 22 749 01 11 Email:copyright@iso.org Website:www.iso.org Published in Switzerland ii IS0/IEC2022-All rights reserved IS0/IEC14496-12:2022(E) Contents Page Foreword X Introduction .xi 1 Scope. .1 2 Normativereferences .1 3 Terms, definitions and abbreviated terms .2 ２７ 3.1 Terms and definitions 3.2 Abbreviatedterms. Object-structuredfile organization 7 4.1 File structure. 7 4.2 Object structure. 7 4.2.1 Objectsyntaxconventions 7 4.2.2Objectdefinitions. 8 4.2.3Extensibilityofobjectdefinitions 9 4.3 File-type box. 10 4.3.1Definition 10 4.3.2 Syntax 10 4.3.3 Semantics 11 .11 4.4 Extended type box 4.4.1 Definition 11 4.4.2 Syntax. 11 4.4.3 Semantics 11 5 Structure ofthis document. .12 6 Isobasemediafileorganization .12 6.1 Files, segments,and streams. 12 6.2 Presentation structure 13 6.2.1Objectstructure ofa presentation 13 6.2.2Metadataandmediadata 13 6.3 Structure-data (objects) .13 .13 6.3.1Box... 6.3.2 Data types and fields 13 6.3.3 URIs as type indicators 14 6.3.4Box 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 spacebox 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 21 Moviebox Movie header box 21 8.2.2 2323 8.3 Track structure 8.3.1 Track box 23 8.3.2 Track header box 8.3.3 Track reference box. .26 8.3.4 Track group box. 28 iii ISO/IEC2022-Allrightsreserved