Scalable multimedia delivery for pervasive computing
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Editor's Note: The drive for innovation in multimedia technology often results in a diversityof ideas and approaches. However, this diversity is introducing new challengesfor accessing multimedia content anytime, anywhere, any way.The richness in multimedia content and increasing heterogeneity of networksand user devices is making interoperable multimedia communicationsdifficult. Intelligent solutions are needed to enable multimedia contentaccess under a wide range of delivery conditions and usage environments.The MPEG-21 standard promises to fill this need by standardizing descriptorsfor multimedia content access and allowing standards-compatible technologiesto be used for adapting multimedia content.In this article, Christian Timmerer and Hermann Hellwagner tell us howMPEG-21 seeks to achieve interoperable multimedia communication acrossnetworks and devices. They describe how MPEG-21 addresses device andformat coding independence by standardizing descriptors of usage environmentand bit-stream syntax. Through detailed examples involvingstreaming of audioývideo resources and adapting of images according toterminal capabilities, the article illustrates how MPEG-21 solves the challengingand important problem of universal multimedia access.驴John R. Smith