DVB-based MPEG-21 digital items for adaptive multimedia streaming

In this paper, we present a prototype application that receives digital video broadcast (DVB) TV streams on a PC, extracts semantic and syntactic metadata from the MPEG-2 transport stream (TS), maps them to MPEG-7 compliant descriptors, and packs these metadata and the associated multimedia content into standard compliant MPEG-21 digital items (DIs). In this form, i.e., as DIs, the DVB content can be searched and accessed by clients such as PCs and PDAs, and can be transported over IP networks. The DVB server can be used as a live source of multimedia content to demonstrate multimedia streaming (e.g., via RTP) and adaptation to diverse devices