INTERNATIONAL ISO/IEC STANDARD 23001-18 Firstedition 2022-06 Information technology MPEG systems technologies Part 18: Event message track format for the Iso base media file format Technologies de I'information-Technologies des systemes MPEG- Partie18:Format dela piste dumessaged'évenementpourleformat Isodebasepourlesfichiersmédias Referencenumber IS0/IEC 23001-18:2022(E) ISO @IS0/IEC2022 IS0/IEC23001-18:2022(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 anyform or by anymeans, electronic or mechanical, including photocopying, orposting on theinternetoran intranet,withoutpriorwrittenpermission.Permissioncanberequestedfrom eitherIsoattheaddressbelow or ISO's member body in the country of the requester. ISO copyright office CP401 : Ch.de Blandonnet 8 CH-1214 Vernier,Geneva Phone: +4122 749 0111 Email: [email protected] Website:www.iso.org Published in Switzerland ii @IS0/IEC 2022-All rights reserved