-Sets for Optimized Reactive Adaptive Playout Management in Distributed Multimedia Database Systems

A novel database system service called playout management service which performs multimedia presentations was proposed recently. In distributed multimedia database systems without end-to-end guarantees, such a playout management service faces the potential problem that system performance can become insufficient when realizing a stored presentation. This problem can be overcome by making the playout management service reactive such that it balances the data amount to be fetched from a remote multimedia database with the system performance available. For the users this means that, a running presentation is adapted by the playout management service. In this paper, we propose the concept of -set to adapt the execution of arbitrary multimedia presentations in an optimized way. We show a heuristic scheme to identify the most adequate -set with respect to (1) the actual system state, (2) the user preferences, and (3) the specific properties of multimedia presentations.