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Recently, HTTP streaming has become very popular for delivering video overthe Internet. For adaptivity, a provider should generate multiple versions of avideo as well as the related metadata. Various adaptation methods have beenproposed to support a streaming client in coping with strong bandwidthvariations. However, most of existing methods target at constant bitrate (CBR)videos only. In this paper, we present a new method for quality adaptation inon-demand streaming of variable bitrate (VBR) videos. To cope with strongvariations of VBR bitrate, we use a local average bitrate as the representativebitrate of a version. A buffer-based algorithm is then proposed toconservatively adapt video quality. Through experiments, we show that ourmethod can provide quality stability as well as buffer stability even undervery strong variations of bandwidth and video bitrates.

A Novel Adaptation Method for HTTP Streaming of VBR Videos over Mobile Networks