1 avwod concept and realization for internet-based media integration

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1、AVWoDConceptandRealizationforInternet-basedMediaIntegrationMarcAlexa,NorbertGerfelder,PaulGrimm,ChristianSeilerFraunhoferInstituteforComputerGraphicsDep.AnimationandHigh-DefinitionImageCommunication64283Darmstadt,GermanyIntroductionDuetotheheavyincreaseoftheuseofcompu

2、ternetworksforbothcommercialandacademicuse,network-basedapplicationsarenowadaysatopicofmajorinterest.Addingvideoandaudiotocomputerapplicationsandtheiruseincomputernetworkshasspecificrequirementsonthequalityissue.Intheareaofcomputer-basedanddistributedapplicationswearec

3、onfrontedwithalargevarietyofdistributionchannelsandoutputdeviceswithdifferentcharacteristicsregardingbandwidth,processingpower,displaysize,etc.Untilnow,distributedsystemsandapplicationsusingaudioandvideoareoftenseparated.Currentsystemsintegratingdifferentmediaaremostly

4、stand-alonesystemsusingharddiskorCD-ROM,withoutusingnetworkdistributionofmedia.Therefore,onegoalforthedevelopmentofdistributednetwork-basedserviceshastobetheintegrationofdifferentmediarepresentations,e.g.text,video,audio,graphicsandothertypesofrepresentationforvisual,a

5、cousticandtactilecommunicationprimitives.Theseserviceswouldenableorimprovenetwork-basedconferencing,teleteaching,newsdistribution,etc.,tomentionjustafewapplicationareas.ThegoaloftheAVWoDprojectAudio-Video-Web-on-DemandcarriedoutatFraunhoferIGDistodeveloptheconceptsan

6、dtobuildthebaseofsuchdistributedapplications.AVWoDisadistributed,network-basedsystemwhichenablestheintegratedandsynchronizedtransmissionandpresentationofaudio,video,andWWWhypertextdocuments.UserscanselectavailablesessionswhichareprovidedbyaAVWoDserver.AsessionintheAVWo

7、Dcontextconsistsofsynchronizedmediadatastreamssharingacommontopic.Thedevelopmentwasbasedondifferentprerequisites:•First,thesystemshouldintegrateexistingwidespreadcomponents,e.g.,tools,applications.Withthisitwouldbepossibletoconcentrateonthedevelopmentofintegrationalcom

8、ponents,•Second,existingprotocolsshouldbeusedifappropriate.Consequently,amajortaskwastoevaluatedifferentInternet-base