Extending an open media-streaming platform to support differentiated services

Zoi, S; Loukatos, D; Papageorgiou, P; Stathopoulos, P; Mitrou, N

dc.contributor.author	Zoi, S	en
dc.contributor.author	Loukatos, D	en
dc.contributor.author	Papageorgiou, P	en
dc.contributor.author	Stathopoulos, P	en
dc.contributor.author	Mitrou, N	en
dc.date.accessioned	2014-03-01T01:53:40Z
dc.date.available	2014-03-01T01:53:40Z
dc.date.issued	2004	en
dc.identifier.issn	16079264	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/27098
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-9744265620&partnerID=40&md5=bf26e2c6a25a0449ded0a33b26495deb	en
dc.subject	Differentiated services	en
dc.subject	DiffServ testbed	en
dc.subject	MPEG4IP	en
dc.subject	QoS specifications	en
dc.subject	Quality metric	en
dc.subject	Streaming platform	en
dc.subject	ToS marking	en
dc.subject.other	Diplex transmission	en
dc.subject.other	Image processing	en
dc.subject.other	Metadata	en
dc.subject.other	Multimedia systems	en
dc.subject.other	Packet networks	en
dc.subject.other	Parameter estimation	en
dc.subject.other	Semantics	en
dc.subject.other	Synchronization	en
dc.subject.other	Differentiated services	en
dc.subject.other	DiffServ testbed	en
dc.subject.other	MPEG4IP	en
dc.subject.other	QoS specifications	en
dc.subject.other	Quality metric	en
dc.subject.other	Streaming platform	en
dc.subject.other	ToS marking	en
dc.subject.other	Quality of service	en
dc.title	Extending an open media-streaming platform to support differentiated services	en
heal.type	journalArticle	en
heal.publicationDate	2004	en
heal.abstract	In this paper, architectural extensions for enhancing an open media-streaming platform with Differentiated Services (DiffServ) mechanisms are studied, implemented, and experimentally evaluated. Towards this end, an appropriate layering is adopted in order to enable the definition of Quality of Service (QoS) specifications and their mapping to network parameters during transmission. Furthermore, a component dedicated to the off-line study of quality requirements is specified and integrated into the QoS aware platform. This component enables to preview the effects of quality violations on media streams, before they are transmitted to the network, by simulating packet losses/delays during the packetization process. Based on this component, a suitable quality metric is introduced for video streams, which is sensitive both to spatial and temporal distortion effects and can be easily applied to other types of streams, or to groups of related streams (e.g. synchronized audio-video). The aforementioned extensions are implemented on the open source MPEG4IP platform. The applicability of certain QoS policies is experimentally evaluated over a laboratory-based DiffServ testbed. In this case, QoS specifications are mapped to DiffServ compliant Type of Service (ToS) values during transmission. Experiments are conducted with an MPEG-4 encoded video stream under different network configurations, QoS policies, and error resilience mechanisms. The performance of the stream is evaluated based on the proposed quality metric.	en
heal.journalName	Journal of Internet Technology	en
dc.identifier.volume	5	en
dc.identifier.issue	4	en
dc.identifier.spage	311	en
dc.identifier.epage	321	en