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The main task of HTTP Adaptive Streaming is to adapt video qualitydynamically under variable network conditions. This is a key feature formultimedia delivery especially when quality of service cannot be grantednetwork-wide and, e.g., throughput may suffer short term fluctuations.  Hence, robust bitrate adaptation schemes become crucial in order to improvevideo quality. The objective, in this context, is to control the filling levelof the playback buffer and maximize the quality of the video, while avoidingunnecessary video quality variations.  In this paper we study bitrate adaptation algorithms based onBackward-Shifted Coding (BSC), a scalable video coding scheme able to greatlyimprove video quality. We design bitrate adaptation algorithms that balancevideo rate smoothness and high network capacity utilization, leveraging both onthroughput-based and buffer-based adaptation mechanisms.  Extensive simulations using synthetic and real-world video traffic tracesshow that the proposed scheme performs remarkably well even under challengingnetwork conditions.

Backward-Shifted Coding (BSC) based on Scalable Video Coding for HAS