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An Optimization Technique of Scene Description for Effective Transmission of Interactive T-DMB Contents  

Li Song-Lu (Department of Computer Science, Kyungpook National University)
Cheong Won-Sik (Broadcasting Media Research Group. Radio and Broadcasting Research Division, Electronics and Telecommunications Research Institute)
Jae Yoo-Young (Broadcasting Media Research Group. Radio and Broadcasting Research Division, Electronics and Telecommunications Research Institute)
Cha Kyung-Ae (School of Computer and Communication Engineering, Daegu University)
Publication Information
Journal of Broadcast Engineering / v.11, no.3, 2006 , pp. 363-378 More about this Journal
Abstract
The Digital Multimedia Broadcasting(DMB) system is developed to offer high quality audio-visual multimedia contents to the mobile environment. The system adopts MPEG-4 standard for the main video, audio and other media format. It also adopts the MPEG-4 scene description for interactive multimedia contents. The animated and interactive contents can be actualized by BIFS(Binary Format for Scene), the binary format for scene description that refers to the spatio-temporal specifications and behaviors of the individual objects. As more interactive contents are, the scene description is also needed more high bitrate. However, the bandwidth for allocating meta data such as scene description is restrictive in mobile environment. On one hand, the DMB terminal starts demultiplexing content and decodes individual media by its own decoder. After decoding each media, rendering module presents each media stream according to the scene description. Thus the BIFS stream corresponding to the scene description should be decoded and parsed in advance of presenting media data. With these reason, the transmission delay of BIFS stream causes the delay of whole audio-visual scene presentation although the audio or video streams are encoded in very low bitrate. This paper presents the effective optimization technique for adapting BIFS stream into expected MPEG-2 TS bitrate without any bandwidth waste and avoiding the transmission delay of the initial scene description for interactive DMB contents.
Keywords
T-DMB; BIFS; MPEG-4; Interactive multimedia; Scene description Optimization;
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