Replacement strategies for quality based video caching

Podlipnig, Stefan; Böszörményi, László

doi:10.1109/icme.2002.1035395

Cited by 28 publications

(23 citation statements)

References 9 publications

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“…Even if the grain was refined, none of these techniques would be efficient. Podlipnig et al [11] proposed a policy which treats the case of layered sequences. Our technique is a refinement, based on matrices of values for temporal and quality data.…”

Section: The Cachesmentioning

confidence: 99%

Hand-Over Video Cache Policy for Mobile Users

Charlet

Chatonnay

Spies

2003

Distributed Applications and Interoperable Systems

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Abstract. Nowadays, wireless links are shared between clients and the available bandwidth fluctuates, so the video stream must be adaptive in order to optimize the transmitted quality. In this article, we present a tool called MoVie to distribute multimedia streaming on large wireless networks. The two main aspects of MoVie deal with network access and managing systems. The management of video streams is realized using video caches linked to a physical area. This article describes the policy used to take into account the mobility of the clients and the hierarchical aspect of the streams by preparing the neighboring caches to receive roaming clients.

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Section: The Cachesmentioning

confidence: 99%

Hand-Over Video Cache Policy for Mobile Users

Charlet

Chatonnay

Spies

2003

Distributed Applications and Interoperable Systems

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“…Related work in this area mostly relies on layered coded videos, which reduces adaptation to the simple case of deleting the highest available enhancement layer. Examples are periodic caching of layered coded videos [3], combination of replacement strategies and layered coded videos [6], quality adjusted caching of GoPs (group of pictures) [9], adaptive caching of layered coded videos in combination with congestion control [8] or simple replacement strategies (patterns) for videos consisting of different quality steps [7]. Most of these proposals rely on simulation to evaluate the performance of the caching techniques.…”

Section: Adaptation and Cache Replacementmentioning

confidence: 99%

QBIX-G: a transcoding multimedia proxy

2006

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Due to the increasing availability of audio/visual data on the Internet, proxy caching is gaining on importance as a performance factor. This increase is accompanied by a diversification in the end terminals, which calls for media gateways and filters.An adaptive proxy is presented which performs (1) caching, (2) filtering and (3) media gateway functionality in one. The proxy can perform media adaptation -using transcodingon its own. A cost model is presented which incorporates user requirements, terminal capabilities and video variations in one formula. Based on this model, the proxy acts as a general broker of different user requirements and of different video variations. This is a first step towards What You Need is What You Get (WYNIWYG) video services, which deliver videos to users in exactly that quality what they need and what they want to pay for. The MPEG-7 and MPEG-21 standards enables this in an interoperable way. A detailed evaluation based on a series of measurements is provided.

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“…Other authors propose to cache the whole video but adapt the quality of the videos according to some criteria. Examples are periodic caching of layered coded videos [13], combination of replacement strategies and layered coded videos [21], quality adjusted caching of GoPs (group of pictures) [25], adaptive caching of layered coded videos in combination with congestion control [24] or simple replacement strategies (patterns) for videos consisting of different quality steps [23]. Most of these proposals rely on simulation to evaluate the performance of the caching techniques.…”

Section: Related Workmentioning

confidence: 99%

“…We introduce the architecture, implementation and evaluation of such a proxy in this paper. A detailed discussion of quality-aware replacement strategies can be found in [23].…”

Section: Introductionmentioning

confidence: 99%

Architecture of a quality based intelligent proxy (QBIX) for MPEG-4 videos

Schojer

Böszörményi

Hellwagner

et al. 2003

Proceedings of the Twelfth International Conference on World Wide Web - WWW '03

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Due to the increasing availability and use of digital video data on the Web, video caching will be an important performance factor in the future WWW. We propose an architecture of a video proxy cache that integrates modern multimedia and communication standards. Especially we describe features of the MPEG-4 and MPEG-7 multimedia standards that can be helpful for a video proxy cache. QBIX 1 supports real-time adaptation in the compressed and in the decompressed domain. It uses adaptation to improve the cache replacement strategies in the proxy, but also to realize media gateway functionality driven by the clients' terminal capabilities.

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Replacement strategies for quality based video caching

Cited by 28 publications

References 9 publications

Hand-Over Video Cache Policy for Mobile Users

Hand-Over Video Cache Policy for Mobile Users

QBIX-G: a transcoding multimedia proxy

Architecture of a quality based intelligent proxy (QBIX) for MPEG-4 videos

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