Layer-encoded video in scalable adaptive streaming
Zink, M.
Schmitt, J.
Steinmetz, R.
Fac. of Electr. Eng. & Inf. Technol., Darmstadt Univ. of Technol., Germany;
This paper appears in: Multimedia, IEEE Transactions on
Publication Date: Feb. 2005
Volume: 7,
Issue: 1
On page(s): 75- 84
ISSN: 1520-9210
INSPEC Accession Number: 8276415
Digital Object Identifier: 10.1109/TMM.2004.840595
Current Version Published: 2005-01-24
Abstract
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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