Layer-encoded video in scalable adaptive streaming
Zink, M.; Schmitt, J.; Steinmetz, R.
Multimedia, IEEE Transactions on
Volume 7, Issue 1, Feb. 2005 Page(s): 75 - 84
Digital Object Identifier   10.1109/TMM.2004.840595
Summary: Combining the concepts of caching and transmission control protocol (TCP)-friendly streaming of layer-encoded video bears the problem that those videos might not be cached in full quality. Therefore, we focus in this work on the scheduling of retransmissions of missing segments of a cached video in a manner that allows clients to receive the content in an improved quality. In a first step, we conducted subjective assessments of variations in layer-encoded video with the goal to validate existing quality metrics, including our own, which are based on certain assumptions. A statistical analysis of the subjective assessment validates these assumptions. We also show that the frequently used peak signal-to-noise ratio (PSNR) is not an appropriate metric for variations in layer-encoded video. With the insight from the subjective assessment we develop heuristics for retransmission scheduling and prove their applicability by conducting a series of simulations.

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