Current approaches for continuous media (CM) file systems focus on scheduling requirements for sessions consisting of single video or audio streams. This paper examines the multimedia delivery problem from the perspective of hypermedia document servers. Such hypermedia documents can be characterized as a web of nodes, each node containing a set of time-dependent CM and discrete media objects. We first look at a hypothetical user's view of a hypermedia session. We then present two service models, the CM service model and the hypermedia service model, and compare them.We propose a new view of session, a hypermedia session, suitable for scheduling the delivery of hypermedia documents, and present sample scheduling algorithms. This notion of hypermedia session is examined from the standpoint of resource management at the orchestration layer of distributed MM system.
We analyze the delivery of an object-oriented multimedia content model, namely MHFG-5 (Multimedia Hypermedia Expert Group), for interactive multimedia applications in a DAVIC-compliant ADSL access network using low-cost memory-constrained set top units. We present detailed latency budgets for MPEG-2 DSM-CC-based transactions including STU configuration, engine download, and application and scene activation. We use simulation and analysis to assess the tradeoffs in memory management and application response time.We discuss our implementation of a subset of DSM-CC and MHEGJ, and latency measurements for presenting MHEG objects. The results are formulated as graphs which can be used by an application designer when encoding an MHEG application.
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