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In this paper, we studied a set of language extensions and a runtime environment suitable for creating and playing distributed multimedia information systems with QoS requirements. At the language level a new set of language extensions for SMIL was presented suitable for the definition of the required QoS and the real-time dimension of the media that participate in a multimedia presentation. The runtime part is mainly focused on the maintenance of real-time constraints accross continuous media streams. It is based on a task oriented model that employs a periodic-based service discipline which provides the required service rate to a continuous media presentation independent of traffic characteristics of other presentations.

Costas Mourlas