Bitstream Scaling and Encoding Methods for MPEG Video Dedicated to Media Synchronization in a Network

Akio ICHIKAWA  Takashi TSUSHIMA  Toshiyuki YOSHIDA  Yoshinori SAKAI  

IEICE TRANSACTIONS on Communications   Vol.E81-B   No.8   pp.1637-1646
Publication Date: 1998/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Multimedia Communications in Heterogeneous Network Environments)
Category: Media Synchronization and Video Coding
MPEG video,  distributed multimedia system,  media synchronization,  bitstream scaling,  

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This paper proposes a bitstream scaling technique for MPEG video for the purpose of media synchronizations. The proposed scaling technique can reduce the frame rate as well as the bit rate of an MPEG data sequence to fit them to the values specified by a synchronization system. The advantage of the proposed technique over existing scaling methods is that it is considering not only the performance of synchronization but also the picture quality of the resulting sequences. To further improve the quality of sequences scaled by the proposed method, this paper also proposes an MPEG encoding technique which sets some of the parameters suitable for the scaling. An experiment using these techniques in an actual media synchronization system has illustrated the usefulness of the proposed approach.