Synchronization models for multimedia presentation with user participation

This paper addresses the key issue of providing flexible multimedia presentation with user participation and suggests synchronization models which can specify the user participation during the presentation. One approach that has been suggested by [4] is the Object Composition Petri Nets (OCPN). OCPN is an augmented model of Petri nets with logic of time intervals for Petri net execution (Timed Petri nets) as durations and resource utilization on the places. This model is incomplete in the sense that the user inputs during the presentation cannot be specified. We suggest a Dynamic Timed Petri Nets model which can be adopted by the OCPN to facilitate modeling of multimedia synchronization characteristics with dynamic user participation. We show that the suggested enhancements for the Dynamic Timed Petri Nets satisfy all the properties of the Petri nets theory and we use the suggested enhancements to model typical scenarios in a multimedia presentation with user inputs.