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Quality-Adaptive Media Streaming by Priority Drop
NOSSDAV '03 Proceedings of the 13th international workshop on Network and operating systems support for digital audio and video (2003)
  • Jonathan Walpole, Oregon Graduate Institute of Science and Technology
  • Charles Krasic, Oregon Graduate Institute of Science and Technology
  • Wu-chi Feng, Oregon Graduate Institute of Science and Technology
Abstract

This paper presents a general design strategy for streaming media applications in best effort computing and networking environments. Our target application is video on demand using personal computers and the Internet. In this scenario, where resource reservations and admission control mechanisms are not generally available, effective streaming must be able to adapt in a responsive and graceful manner. The design strategy we propose is based on a single simple idea, priority data dropping, or priority drop for short. We evaluate the efficacy of priority drop as an adaptation tool in the video and networking domains. Our technical contribution with respect to video is to show how to express adaptation policies and how to do priority-mapping, an automatic translation from adaptation policies to priority assignments on the basic units of video. For the networking domain, we present priority-progress streaming, a real-time best-effort streaming protocol. We have implemented and released a prototype video streaming system that incorporates priority-drop video, priority mapping, and priority-progress streaming. Our system demonstrates a simple encode once, stream anywhere model where a single video source can be streamed across a wide range of network bandwidths, on networks saturated with competing traffic, all the while maintaining real-time performance and gracefully adapting quality.

Keywords
  • Adaptive computing systems,
  • Streaming technology (Telecommunications),
  • Computer network protocols
Publication Date
June, 2003
Citation Information
Jonathan Walpole, Charles Krasic and Wu-chi Feng. "Quality-Adaptive Media Streaming by Priority Drop" NOSSDAV '03 Proceedings of the 13th international workshop on Network and operating systems support for digital audio and video (2003)
Available at: http://works.bepress.com/jonathan_walpole/92/