Multimedia Systems

, Volume 5, Issue 1, pp 39–52 | Cite as

Spatio-temporal effects of multimedia objects storage and delivery for video-on-demand systems

  • Cyril U. Orji
  • Patrick O. Bobbie
  • Kingsley C. Nwosu


As the number of video streams to be supported by a digital video delivery system (DVDS) increases, an improved understanding of the necessity for reliable and cost-efficient support for a considerable number of video streams (in the magnitude of tens of thousands), and the dependency largely on software capabilities emerges. Even in the presence of an optimal hardware configuration, or model, and associated costs, using software to exploit the underlying hardware capabilities is of paramount importance. Although a number of DVDSs have become operational, their ability to deliver the required services mainly depends on the small number of streams supported and the hardware trade-offs. It is imperative that current software developments account for the eventual scalability of the number of video streams without commensurate increase in hardware. In this paper, we present strategies for the management of video streams in order to maintain and satisfy their space and time requirements. We use a DVDS architectural model with functionally dichotomized nodes: a single-node partition is responsible for data retrieval, while the remaining partition of nodes accepts user requests, determines object locations, and routes requests through the network that connects both partitions. We present a detailed analysis of the issues related to queuing I/O requests and data buffering. The discussion includes the requirements for arranging and scheduling I/O requests and data buffers, with the objective of guaranteeing the required data availability rates for continuous media display.

Key words:Buffer queues – Buffer scheduling – Data allocation – Data striping – Stream management – Video delivery 

Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • Cyril U. Orji
    • 1
  • Patrick O. Bobbie
    • 2
  • Kingsley C. Nwosu
    • 3
  1. 1.School of Computer Science, Florida International University, Miami, FL 33199, USAUS
  2. 2.Department of CIS, Florida A&M University, Tallahassee, FL 32307, USAUS
  3. 3.Lucent Technologies (AT&T Bell Labs), 67 Whippany Rd., Whippany, NJ 07981-0903, USAUS

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