ITU-T J.124 (03 2004) (英) Multiplexing format for

INTERNATIONALTELECOMMUNICATIONUNIONITU-TJ.124TELECOMMUNICATIONSTANDARDIZATIONSECTOROFITU(03/2004)SERIESJ:CABLENETWORKSANDTRANSMISSIONOFTELEVISION,SOUNDPROGRAMMEANDOTHERMULTIMEDIASIGNALSInteractivesystemsfordigitaltelevisiondistributionMultiplexingformatformultimediawebcastingoverTCP/IPnetworksITU-TRecommendationJ.124ITU-TRec.J.124(03/2004)iITU-TRecommendationJ.124MultiplexingformatformultimediawebcastingoverTCP/IPnetworksSummaryThisRecommendationprovidesanextendedmultiplexingformatbasedonITU-TRec.J.123,whichisappropriateforaudioandvideotransmissionbydownload-basedprotocoloverTCP/IPwithoutanysessioncontrolprotocolsbetweenserverandclient,a.k.a.ProgressiveDownload.FragmentedstructureisnewlyintroducedintothisRecommendation.Inthefragmentstructure,mediadataisdividedintomediafragments,andamovieheaderisalsodividedintomoviefragmentheadersaccordingtothefragmentedmediadata.Eachmoviefragmentheadercorrespondstoeachmediafragment,andtheseelementsconstituteamoviefragment.Byadaptingthefragmentstructuretolongdurationcontent,ahugeheader,whichcausesinitialdelayoftheprogressivestreaming,canbeavoided.Inaddition,formattedtextinformationisstoredinthemediadatasothatthesecanbeinterleavedwithoneanotherinafile.Thisformatalsocarriesmetadata,digitalrightsmanagement(DRM)informationaswellasaudio,videoandtextbitstreams.ExamplesofuseofthisRecommendationaregiveninAppendicesI,IIandIII.SourceITU-TRecommendationJ.124wasapprovedon15March2004byITU-TStudyGroup9(2001-2004)undertheITU-TRecommendationA.8procedure.iiITU-TRec.J.124(03/2004)FOREWORDTheInternationalTelecommunicationUnion(ITU)istheUnitedNationsspecializedagencyinthefieldoftelecommunications.TheITUTelecommunicationStandardizationSector(ITU-T)isapermanentorganofITU.ITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommendationsonthemwithaviewtostandardizingtelecommunicationsonaworldwidebasis.TheWorldTelecommunicationStandardizationAssembly(WTSA),whichmeetseveryfouryears,establishesthetopicsforstudybytheITU-Tstudygroupswhich,inturn,produceRecommendationsonthesetopics.TheapprovalofITU-TRecommendationsiscoveredbytheprocedurelaiddowninWTSAResolution1.InsomeareasofinformationtechnologywhichfallwithinITU-T'spurview,thenecessarystandardsarepreparedonacollaborativebasiswithISOandIEC.NOTEInthisRecommendation,theexpressionAdministrationisusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedoperatingagency.CompliancewiththisRecommendationisvoluntary.However,theRecommendationmaycontaincertainmandatoryprovisions(toensuree.g.interoperabilityorapplicability)andcompliancewiththeRecommendationisachievedwhenallofthesemandatoryprovisionsaremet.Thewordsshallorsomeotherobligatorylanguagesuchasmustandthenegativeequivalentsareusedtoexpressrequirements.TheuseofsuchwordsdoesnotsuggestthatcompliancewiththeRecommendationisrequiredofanyparty.INTELLECTUALPROPERTYRIGHTSITUdrawsattentiontothepossibilitythatthepracticeorimplementationofthisRecommendationmayinvolvetheuseofaclaimedIntellectualPropertyRight.ITUtakesnopositionconcerningtheevidence,validityorapplicabilityofclaimedIntellectualPropertyRights,whetherassertedbyITUmembersorothersoutsideoftheRecommendationdevelopmentprocess.AsofthedateofapprovalofthisRecommendation,ITUhadnotreceivednoticeofintellectualproperty,protectedbypatents,whichmayberequiredtoimplementthisRecommendation.However,implementorsarecautionedthatthismaynotrepresentthelatestinformationandarethereforestronglyurgedtoconsulttheTSBpatentdatabase.ITU2004Allrightsreserved.Nopartofthispublicationmaybereproduced,byanymeanswhatsoever,withoutthepriorwrittenpermissionofITU.ITU-TRec.J.124(03/2004)iiiCONTENTSPage1Scope............................................................................................................................12References.....................................................................................................................12.1Normativereferences......................................................................................12.2Informativereferences....................................................................................12.3Bibliography...................................................................................................13Termsanddefinitions...................................................................................................24Abbreviations................................................................................................................25Referencearchitecture..................................................................................................26Multiplexingformat......................................................................................................36.1Basicstructure................................................................................................36.2Objectstructure..............................................................................................36.3Boxorder......................................................