Detection of The Time Conflicts for Smil-Based Multimedia Presentations

Abstract

In this paper, the mechanism for detecting the time conflicts for SMIL-based multimedia presentations is proposed. The time conflict for SMIL, which is not the syntax error but the semantic error, is defined as the conflict of the attribute values in the SMIL synchronization elements. In addition to the examination of the syntax error, it will be helpful to provide the mechanism of detecting the time conflict in a SMIL presentation while authoring the multimedia presentation. In order to deal with the temporal relationship among the elements efficiently, the SMIL script is first converted to a synchronization model named RTSM (Real-time Synchronization Model). By traversing the RTSM, the firing time (active time) of each transition in the RTSM model could be determined. The case of inconsistency that the firing time of a transition is later than that of its following transition results in a time conflict. The corresponding elements for the pair of conflicting transitions that result in the time conflict are therefore identified.