Quality-adaptive scheduling for live streaming over multiple access networks

  • Authors:

  • Kristian Evensen;Tomas Kupka;Dominik Kaspar;Pål Halvorsen;Carsten Griwodz

  • Affiliations:

  • Simula Research Laboratory, Oslo, Norway;University of Oslo, Oslo, Norway;Simula Research Laboratory, Oslo, Norway;University of Oslo, Simula Research Laboratory, Oslo, Norway;University of Oslo, Simula Research Laboratory, Oslo, Norway

  • Venue:
  • Proceedings of the 20th international workshop on Network and operating systems support for digital audio and video
  • Year:
  • 2010

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Abstract

Video streaming ranks among the most popular services offered through the Internet today. At the same time, accessing the Internet over public WiFi and 3G networks has become part of our everyday lives. However, streaming video in wireless environments is often subject to frequent periods of rebuffering and characterized by low picture quality. In particular, achieving smooth and quality-adaptive streaming of live video poses a big challenge in mobile scenarios. Building on the observation that the subjective video experience on mobile devices decreases when quality changes are more frequent than every 1 to 2 seconds, we present a client-side scheduler that retrieves segments of several video encodings over heterogeneous network interfaces simultaneously. By extending the DAVVI streaming platform with support for multiple interfaces, the proposed scheduler's performance is experimentally evaluated. The results show that our scheduler reduces the video interruptions and achieves a higher and more stable average quality over multiple, truly heterogeneous wireless interfaces.