Springer Verlag, Lecture Notes in Computer Science, p. 131-140
DOI: 10.1007/11922162_16
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MPEG-21 BSDL offers a solution for exposing the structure of a binary media resource as an XML description, and for the genera- tion of a tailored media resource using a transformed XML description. The main contribution of this paper is the introduction of a real-time work flow for the XML-driven adaptation of H.264/AVC bitstreams in the temporal domain. This real-time approach, which is in line with the vision of MPEG-21 BSDL, is made possible by two key technologies: BFlavor (BSDL + XFlavor) for the efficient generation of XML descrip- tions and Streaming Transformations for XML (STX) for the efficient transformation of these descriptions. Our work flow is validated in seve- ral applications, all using H.264/AVC bitstreams: the exploitation and emulation of temporal scalability, as well as the creation of video skims using key frame selection. Special attention is paid to the deployment of hierarchical B pictures and to the use of placeholder slices for synchro- nization purposes. Extensive performance data are also provided.