Issues of quality and multiplexing when smoothing rate adaptive video

Abstract

Abstract-We have proposed a smoothing and rate adaptation algorithm-SAVE (Smoothed Adaptive Video over Explicit rate networks)-for transport of compressed video over rate-controlled networks. SAVE attempts to preserve quality as much as possible, and exercises control over the source rate only when essential to prevent unacceptable delay. In order to understand the impact on quality of rate adaptation, we have evolved the quality metrics typically used to evaluate the efficacy of mechanisms to transport video. In this paper, we investigate the dynamic nature of rate reduction: any prolonged impairment is likely to be noticeable. We study the sensitivity of SAVE to its parameters and network characteristics. Finally, the utility of the proposed scheme is measured by its ability to multiplex a large number of streams effectively. Our evaluations are based on experiments with 20 traces of entertainment videos using different compression algorithms.

A Framework for Advanced Video Traces: Evaluating Visual Quality for Video Transmission Over Lossy Networks

“…We also note that in [14], video traces have been used for studying rate adaptation schemes that consider the quality of the rate-regulated videos. The quality of the regulated videos is assigned a discrete perceptual value, according to the amount of the rate regulation.…”