MPEG-21 bitstream syntax descriptions for scalable video codecs

In order to obtain a useful multichannel publication environment, a content producer has to respect the different terminal and network characteristics of the multimedia devices of its target audience. Embedded scalable video bitstreams, together with a complementary content adaptation framework, give the possibility to respond to heterogeneous usage environments. In this paper, temporally scalable H.264/MPEG-4 AVC encoded bitstreams and bitstreams encoded by relying on the fully-embedded MC-EZBC wavelet-based codec are used. The MPEG-21 Bitstream Syntax Description Language (BSDL) specification is used to generate high-level XML descriptions of the structure of a bitstream. As such, the adaptation of a scalable video stream can be realized in the XML domain, rather than on the bitstream itself. Different transformation technologies are compared to each other as well. Finally, a practical setup of a video streaming use case is discussed by relying on the MPEG-21 BSDL framework.

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