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by Wu-chi Feng, Jennifer Rexford
IEEE Transactions on Multimedia
http://www.research.att.com/~jrex/papers/smooth_ext.ps.Z
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Abstract:
The transfer of prerecorded, compressed variable-bit-rate video requires multimedia services to support large fluctuations in bandwidth requirements on multiple time scales. Bandwidth smoothing techniques can reduce the burstiness of a variable-bit-rate stream by transmitting data at a series of fixed rates, simplifying the allocation of resources in video servers and the communication network. Given a fixed client-side playback buffer, several bandwidth smoothing algorithms have been introduced that are provably optimal under certain constraints. This paper compares the transmission schedules generated by the various smoothing algorithms, based on a collection of metrics that relate directly to the server, network, and client resources necessary for the transmission, transport, and playback of prerecorded video. Due to the scarcity of available trace data, we have constructed a video capture testbed and generated a collection of twenty full-length, motionJPEG encoded video clips. For the sake of comparison, the experiments also evaluate a collection of MPEG-1 clips. Using these video traces and a range of client buffer sizes, we investigate the interplay between the performance metrics and the smoothing algorithms. The results highlight the unique strengths and weaknesses of each bandwidth smoothing algorithm, as well as the characteristics of a diverse set of motion-JPEG and MPEG video clips.
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