Per-GOP Bitrate Adaptation for H.264 Compressed Video Sequences

Vito, Fabio De; Özçelebi, Tanır; Civanlar, M.R.; Tekalp, A. Murat; Martin, Juan Carlos De

doi:10.1007/11738695_26

Cited by 2 publications

(2 citation statements)

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“…Therefore, in multimedia service quality adaptation, adaptation speed should not be higher than that of the multimedia codec. In [19], it is argued that the video adaptation algorithms in the literature need up to 3 groups of pictures (GOP) in order to converge to a target bit rate every time the video is adapted. Here a GOP is defined as a frame sequence of a given structure in a video stream, whose first frame is an intra-coded (I) frame.…”

Section: Resultsmentioning

confidence: 99%

“…Here a GOP is defined as a frame sequence of a given structure in a video stream, whose first frame is an intra-coded (I) frame. Furthermore, it is also denoted in [19] that the size of a GOP has to be kept large in an encoded video bit stream in order to attain reasonable compression efficiency and 1 GOP per second is taken as a rule of thumb, which would allow 1 adaptation in every 3 seconds for the other rate controllers in the literature and 1 adaptation per second for the advanced rate controller of [19]. Therefore, we assume that the maximum video adaptation frequency is 1 adaptation per second for typical videos.…”

Section: Resultsmentioning

confidence: 99%

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Real-Time Resource Availability Signaling in IP Multimedia Subsystem Networks

Özçelebi¹,

Radovanović²,

Sengupta³

2008

JSSM

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IP Multimedia Subsystem (IMS) allows the use of unlicensed, non-dedicated and nondeterministic access networks for delivering IP multimedia services. Providing end-to-end Quality-of-Service (QoS) for resource demanding real-time services (e.g. real-time multimedia) over such networks is a challenging task due to varying resource availability of the network and the end-device during a single session . A common solution to this problem is adapting service quality and type according to availability of system resources, which requires end-to-end monitoring and signaling of resource availability during a single session. This paper presents an extension of the IMS architecture for real-time resource availability monitoring and signaling. The novelty of the proposed extension is twofold. It takes into account uncon-trolled access networks with no resource reservation on the one hand, and end devices on the other. Two system archi-tecture components are introduced for monitoring and signaling of the real-time resource availability in both networks (e.g. bandwidth, buffer space), and end-devices (e.g. battery, CPU, memory, storage), namely a Resource Manager (RM) and a Resource Availability Server (RAS). Our solution does not require any modifications of the IMS architec-ture and can be implemented as a plug-in

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%