29 January 2007 Efficient MPEG-21-based adaptation decision-taking for scalable multimedia content
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The MPEG-21 standard defines a framework for the interoperable delivery and consumption of multimedia content. Within this framework the adaptation of content plays a vital role in order to support a variety of terminals and to overcome the limitations of the heterogeneous access networks. In most cases the multimedia content can be adapted by applying different adaptation operations that result in certain characteristics of the content. Therefore, an instance within the framework has to decide which adaptation operations have to be performed to achieve a satisfactory result. This process is known as adaptation decision-taking and makes extensive use of metadata describing the possible adaptation operations, the usage environment of the consumer, and constraints concerning the adaptation. Based on this metadata a mathematical optimization problem can be formulated and its solution yields the optimal parameters for the adaptation operations. However, the metadata is represented in XML resulting in a verbose and inefficient encoding. In this paper, an architecture for an Adaptation Decision-Taking Engine (ADTE) is introduced. The ADTE operates both on XML metadata and on metadata encoded with MPEG's Binary Format for Metadata (BiM) enabling an efficient metadata processing by separating the problem extraction from the actual optimization step. Furthermore, several optimization algorithms which are suitable for scalable multimedia formats are reviewed and extended where it was appropriate.,
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Ingo Kofler, Christian Timmerer, Hermann Hellwagner, Andreas Hutter, Francesc Sanahuja, "Efficient MPEG-21-based adaptation decision-taking for scalable multimedia content", Proc. SPIE 6504, Multimedia Computing and Networking 2007, 65040J (29 January 2007); doi: 10.1117/12.705847; https://doi.org/10.1117/12.705847


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