ISO/IEC INTERNATIONAL STANDARD 14496-14 Third edition 2020-01 Information technology Coding of audio-visual objects - Part 14: MP4 file format Technologies de I'information - Codage des objets audiovisuels - Partie14:FormatdefichierMP4 Reference number IS0/IEC 14496-14:2020(E) IEC ISO @IS0/IEC2020 IS0/IEC14496-14:2020(E) COPYRIGHTPROTECTEDDOCUMENT @IS0/IEC2020 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 beloworIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 40i : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone:+41227490111 Fax: +4122 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii IS0/IEC2020-Allrightsreserved IS0/IEC14496-14:2020(E) Contents Page Foreword iv Introduction V Scope 1 1 2 Normative references .1 3 Terms and definitions 1 4 Storage of MPEG-4 1 4.1 Elementary stream tracks 4.1.1 Elementary stream data Elementary stream descriptors 4.1.2 2 Object descriptors.. 4.1.3 2 4.2 Track identifiers. 3 4.3 Synchronization of streams 4.4 Composition 5 4.5 Handling of M4Mux 5 5 File identification 6 6 Additions to the Base Media Format 6 6.1 General. 6 6.2 Object Descriptor Box 7 6.2.1 Description. 7 6.2.2 Syntax 7 6.2.3 Semantics 7 6.3 Track reference types 7 6.4 Track header box. 8 6.5 Handler reference types. 8 6.6 MPEG-4 media header boxes 8 6.6.1 General. 8 6.6.2 Syntax 8 Semantics. 6.6.3 8 6.7 Sample description boxes 9 6.7.1 Description. 9 6.7.2 Syntax 10 6.7.3 Semantics 10 6.8 Degradation priority values 10 7 Template fields used .11 .12 Annex A (informative) Handling of audio timestamps and profile/level indication Bibliography .13 IS0/IEC 2020-Allrights reserved iii