Evaluation of HTTP-based request-response streams for internet video streaming

  • Authors:
  • Robert Kuschnig;Ingo Kofler;Hermann Hellwagner

  • Affiliations:
  • Klagenfurt University, Klagenfurt, Austria;Klagenfurt University, Klagenfurt, Austria;Klagenfurt University, Klagenfurt, Austria

  • Venue:
  • MMSys '11 Proceedings of the second annual ACM conference on Multimedia systems
  • Year:
  • 2011

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Abstract

Adaptive video streaming based on TCP/HTTP is becoming popular because of its ability to adapt to changing network conditions. We present an in-depth experimental analysis of the use of HTTP-based request-response streams for video streaming. In this scheme, video fragments are fetched by a client from the server, in smaller units called chunks, potentially via multiple parallel HTT P requests (TCP connections). A model for the achievable throughput is formulated.The model is validated by a broad range of streaming experiments, including an evaluation of TCP-friendliness. Our findings include that request-response streams are able to scale with the available bandwidth by increasing the chunk size or the number of concurrent streams. Several combinations of system parameters exhibiting TCP-friendliness are presented. We also evaluate the video streaming performance in terms of video quality in the presence of packet loss. Multiple request-response streams are able to maintain satisfactory performance, while a single TCP connection deteriorates rapidly with increasing packet loss. The results provide experimental evidence that HTTP-based request-response streams are a good alternative to classical TCP streaming