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Caching video objects: layers vs versions?

delete2006-09-23
delete7
PRE
AI
F
Felix Hartanto
J
Jussi Kangasharju
M
Martin Reisslein *
K
Keith W. Ross
DOI：10.1007/s11042-006-0037-zdelete
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Abstract

Abstract

En 中文
Because Internet access rates are highly heterogeneous, many video content providers today make available different versions of the videos, with each version encoded at a different rate. Multiple video versions, however, require more server storage and may also dramatically impact cache performance in a traditional cache or in a CDN server. An alternative to versions is layered encoding, which can also provide multiple quality levels. Layered encoding requires less server storage capacity and may be more suitable for caching; but it typically increases transmission bandwidth due to encoding overhead. In this paper we compare video streaming of multiple versions with that of multiple layers in a caching environment. We examine caching and distribution strategies that use both versions and layers. We consider two cases: the request distribution for the videos is known a priori; and adaptive caching, for which the request distribution is unknown. Our analytical and simulation results indicate that mixed distribution/caching strategies provide the best overall performance.
Keywords:
proxy caching
streaming video
layered video
multi-version video

Journal

Multimedia Tools and Applications cover
Multimedia Tools and Applications
IF:
3
Papers:
1.9W
Citations:
3.2W

Organization

No organization information available