IEC International ISO Standard IS0/IEC23009-9 Information technology - Dynamic First edition adaptive streaming over HTTP 2025-05 (DASH) 一 Part 9: Redundant encoding and packaging for segmented live media (REaP) TechnologiesdeI'information-Diffusionadaptativedynamique surHTTP (DASH) Partie9:Encodageetempaquetageredondantdes segments médiasendirect (REaP) Referencenumber ISO/IEC23009-9:2025(en) ?ISO/IEC2025 IS0/IEC23009-9:2025(en) COPYRIGHTPROTECTEDDOCUMENT IS0/IEC2025 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 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 copyrightoffice CP401.Ch.deBlandonnet8 CH-1214Vernier,Geneva Phone:+4122 749 0111 Email:[email protected] Website:www.iso.org Published in Switzerland IS0/IEC2025-All rightsreserved i IS0/IEC23009-9:2025(en) Contents Page Foreword. .iv Introduction v 1 Scope 2 Normativereferences .1 3 Terms,definitionsandabbreviatedterms 2 3.1 .2 Terms. 3.2 Abbreviatedterms .3 4 Overview .4 5 Reference workflow for redundant encoding and packaging (REaP) .4 5.1 ReferenceworkflowforREaP. .4 5.2 REaPassumptions .5 5.3 Generalworkflowand operation ..6 FormatsforRedundant distribution Encoding .7 6 1 6.1 ConstraintsontheIngestMediaPresentationDescription(I-MPD) 6.2 Constraints ontheredundantencodertrackand segmentformat ..8 6.2.1Mixedfileandliveinputstotheencoder. .10 7 Constraintsonencoderrequeststopackager .10 8 Formatsforredundantmediapresentationpackaging .12 8.1 Generalrequirementsonredundantpackagerinput 12 8.2 General requirements ontheredundantpackageroutputformat(s) 12 8.3 SpecificrequirementsontheredundantpackagerD-MPDoutputformat 12 8.4 SpecificrequirementsontheredundantpackagerHLSoutputformat 13 8.5 Generalrequirementsontheoriginoutputformat 13 Asset storageand recordingformat .13 9 9.1 General. 13 9.2 Track format for storage of live archives .14 9.2.1Storagetrackfile 14 9.2.2Storagetrackidentifiers. 14 9.3 Storagemediapresentationdescription (S-MPD) 15 9.3.1 Overview 15 9.3.2 Constraints on the S-MPD for 24x7live archiving and recording 16 9.3.3 ConstraintontheS-MPDforrecording24x7livecontent. .16 AnnexA(informative)Examplemediapresentationdescription 17 AnnexB(informative)Recommendedsegmentdurationsforencodersynchronization .24 AnnexC(informative)Exampleapplications .25 AnnexD(informative)Examplemethods of carriage of sourcetiming .26 AnnexE(informative)SynchronizationTimeStamp(STS)usage .27 AnnexF(Informative)Examplemethodforredundantencodertracksgeneration .28 AnnexG(informative)ExamplemethodforgeneratingarecordingS-MPDfromanIMPD 30 AnnexH(informative)Exchangingsynchronizationinformationbetweendistributionencoders.. ..31. Bibliography .32 IS0/IEC2025-All rightsreserved ili IS0/IEC23009-9:2025(en) Foreword Iso(theInternationalOrganizationforStandardization)andIEC(theInternationalElectrotechnical Commission) form the specialized system for worldwide standardization.National bodies that are membersof ISO orIEC participate inthe development of International Standards throughtechnical IsOand IECtechnical committees collaborate infields ofmutual interest.Otherinternationalorganizations, governmental and non-governmental,inliaisonwithIsOandIEC,alsotakepartinthework. Theproceduresusedtodevelopthisdocumentandthoseintendedforitsfurthermaintenancearedescribed intheIso/IEcDirectives,Part1.Inparticular,thedifferentapproval criterianeededforthedifferenttypes of documentshould benoted.This document was drafted in accordance withthe editorial rules of the Iso/ IEcDirectives,Part2(seewww.iso.org/directivesorwww.iec.ch/members_experts/refdocs). Isoand IECdrawattentiontothepossibilitythatthe implementationof thisdocumentmayinvolvethe useof (a)patent(s