Periodic broadcasting with VBR-encoded video

Martin Reisslein, Despina Saparilla, Keith W. Ross

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

We consider designing near video on demand (NVOD) systems that minimize startup latency while maintaining high image quality. Recently nonuniform segmentation has been used to develop periodic broadcasting techniques for NVOD. These techniques give significant reductions in startup latency as compared with more conventional uniform segmentation. Essentially all of these schemes assume, however, that the videos are CBR-encoded. Since a CBR-encoded video has a larger average rate than an open-loop VBR encoding with the same image quality, there is potential to obtain further performance improvements by using VBR video. In this paper we develop a series of multiplexing schemes for the periodic broadcasting of VBR-encoded video that are based on smoothing, server buffering, and client prefetching. Two key but conflicting performance measures exist when using VBR video: latency and packet loss. By introducing small additional delays in our multiplexing schemes, our trace-based numerical work shows that the schemes can achieve nearly 100% link utilization with negligible packet loss. When the ratio of the CBR rate to the VBR average rate is a modest 1.8, startup latency can be reduced by a factor of four or more for common scenarios.

Original languageEnglish (US)
Pages (from-to)503-516
Number of pages14
JournalMultimedia Systems
Volume9
Issue number6
DOIs
StatePublished - Jun 1 2004

Keywords

  • Near video on demand
  • Prefetching
  • Statistical multiplexing
  • Variable bit rate video

ASJC Scopus subject areas

  • Software
  • Information Systems
  • Media Technology
  • Hardware and Architecture
  • Computer Networks and Communications

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