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• W2158245206 abstract "We present a new approach to variable bit rate (VBR) video traffic modeling designed to capture the multi- scale characteristics that are critical in determining buffering requirements. Much of the previous work in video traffic model- ing has focused on real-time multimedia systems that of necessity involve queuing models with small buffers. Today there is growing interest in understanding systems in which high quality video is downloaded in non-real-time from a source such as the Internet, and then distributed at a later time in a local environment to a very low-cost and thus resource-constrained device. Smooth play- back and avoidance of data loss are of paramount importance. The work here analyzes the tradeoffs between buffering resources and the video quality in such environments, and provides a framework that is directly relevant to a large class of emerging applications and systems. I. INTRODUCTION designed to receive video from a nearby wireless server, and must utilize a minimum of memory and processing power. While minimization of memory and processing power is also a limitation on devices such as DVD players, in a DVD player the tasks of reading and then decoding the compressed data are performed inside a single device. By contrast, in the environment under consideration here, the compressed data is delivered to the resource-constrained client over a bandwidth- limited and potentially lossy link. Furthermore, in contrast with DVD content, low-cost video display devices are called upon to receive and decode content covering a large range of video parameters, most of which was encoded without regard for the limitations imposed by these systems. Although the emerging remote clients are resource constrained, and buffers should be kept as small as possible, they can still be large enough to enable storage of several seconds or more of data. This contrasts with real-time two-way systems such as video- conferencing which targets delays, and therefore maximum buffer sizes. Delays are typically kept to tens or hundreds of milliseconds. In the present work we present a framework for charac- terizing buffering requirements in light of the wide variety of content and distribution systems. We then describe a new VBR traffic model that specifically aims to capture the multi-scale characteristics that impact design of resource-limited display devices. The model and associated framework are validated using a set of several hundred video sequences each with a duration of about 45 minutes, and reflecting a wide variety of content. The rest of this paper is organized as follows: Section II discusses previous work on VBR video models and places the new model in context. The buffering metric and VBR traffic model are described in sections III and IV respectively. Experimental results are contained in Section V and conclusions in Section VI." @default.
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• W2158245206 title "Video Traffic Modeling for Resource-Constrained Clients" @default.
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