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检索条件"任意字段=Conference on Multimedia Computing and Networking 1996"

共 135 条记录，以下是11-20 订阅

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Flash on disk for low-power multimedia computing

Flash on disk for low-power multimedia computing

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14th conference on multimedia computing and networking 2007

作者： Singleton, Leo Nathuji, Ripal Schwan, Karsten Georgia Inst Technol Coll Comp Atlanta GA 30332 USA

ISBN: (纸本)9780819466174

Mobile multimedia computers require large amounts of data storage, yet must consume low power in order to prolong battery life. Solid-state storage offers low power consumption, but its capacity is an order of magnitude smaller than the hard disks needed for high-resolution photos and digital video. In order to create a device with the space of a hard drive, yet the low power consumption of solid-state storage, hardware manufacturers have proposed using flash memory as a write buffer on mobile systems. This paper evaluates the power savings of such an approach and also considers other possible flash allocation algorithms, using both hardware- and software-level flash management. Its contributions also include a set of typical multimedia-rich workloads for mobile systems and power models based upon current disk and flash technology. Based on these workloads, we demonstrate an average power savings of 267 mW (53% of disk power) using hardware-only approaches. Next, we propose another algorithm. termed Energy-efficient Virtual Storage using Application-Level Framing (EVS-ALF), which uses both hardware and software for power management. By collecting information from the applications and using this metadata to perform intelligent flash allocation and prefetching, EVS-ALF achieves an average power savings of 307 mW (61%), another 8% improvement over hardware-only techniques.

关键词： multimedia Operating systems Video Algorithm development computing systems Systems modeling Solid state electronics Digital photography Data storage Manufacturing

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Video to go: The effects of mobility on streaming media in a CDMA2000 1xEV-DO network

Video to go: The effects of mobility on streaming media in a...

引用

14th conference on multimedia computing and networking 2007

作者： Sessini, Phillipa Leventer, Matel Mahanti, Anirban Univ Calgary Dept Comp Sci 2500 Univ Dr NW Calgary AB T2N 1N4 Canada

ISBN: (纸本)9780819466174

This paper experimentally examines the performance of streaming media applications over a CDMA2000 1xEV-DO network. The performance of streaming in a cellular network is tested across three different levels of mobility., two applications, and the two transport layer protocols, TCP and UDP. Findings of this study are that streaming applications are impacted more by sources of interference such as high-rise buildings than by increased velocity. Also, when the mobile client is stationary, high data rates and high video quality are consistently achieved. We also find that for the streaming applications considered, UDP streams outperform TCP streams, consistently achieving higher bandwidth.

关键词： wireless multimedia video streaming wireless WANs code division multiple access (CDMA) third generation (3G)

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Efficient MPEG-21-based adaptation decision-taking for scalable multimedia content

Efficient MPEG-21-based adaptation decision-taking for scala...

引用

14th conference on multimedia computing and networking 2007

作者： Kofler, Ingo Timmerer, Christian Hellwagner, Hermann Hutter, Andreas Sanahuja, Francesc Klagenfurt Univ Dept Informat Technol A-9020 Klagenfurt Austria Siemens AG Corp Technol D-81730 Munich Germany

ISBN: (纸本)9780819466174

The MPEG-21 standard defines a framework for the interoperable delivery and consumption of multimedia content. Within this framework the adaptation of content plays a vital role in order to support a variety of terminals and to overcome the limitations of the heterogeneous access networks. In most cases the multimedia content can be adapted by applying different adaptation operations that result in certain characteristics of the content. Therefore, an instance within the framework has to decide which adaptation operations have to be performed to achieve a satisfactory result. This process is known as adaptation decision-taking and makes extensive use of metadata describing the possible adaptation operations, the usage environment of the consumer, and constraints concerning the adaptation. Based on this metadata a mathematical optimization problem can be formulated and its solution yields the optimal parameters for the adaptation operations. However, the metadata is represented in XML resulting in a verbose and inefficient encoding. In this paper, an architecture for an Adaptation Decision-Taking Engine (ADTE) is introduced. The ADTE operates both on XML metadata and on metadata encoded with MPEG's Binary Format for Metadata (BiM) enabling an efficient metadata processing by separating the problem extraction from the actual optimization step. Furthermore, several optimization algorithms which are suitable for scalable multimedia formats are reviewed and extended where it was appropriate.

关键词： adaptation decision-taking MPEG-21 digital item adaptation binary format for metadata (BiM)

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iTVP: Large scale content distribution for live and on-demand video services

iTVP: Large scale content distribution for live and on-deman...

引用

14th conference on multimedia computing and networking 2007

作者： Kusmierek, Ewa Czyrnek, Miroslaw Mazurek, Cezary Stroinski, Maciej Poznan Supercomp & Networking Ctr Ul Noskowskiego 10 PL-61704 Poznan Poland

ISBN: (纸本)9780819466174

iTVP is a system built for IP-based delivery of live TV programming, video-on-demand and audio-on-demand with interactive access over IP networks. It has a country-wide range and is designed to provide service to a high number of concurrent users. iTVP prototype contains the backbone of a two-level hierarchical system designed for distribution of multimedia content from a content provider to end users. In this paper we present experience gained during a few months of the prototype operation. We analyze efficiency of iTVP content distribution system and resource usage at various levels of the hierarchy. We also characterize content access patterns and their influence on system performance, as well as quality experienced by users and user behavior. In our investigation, scalability is one of the most important aspects of the system performance evaluation. Although the range of the prototype operation is limited, as far as the number of users and the content repository is concerned, we believe that data collected from such a large scale operational system provides a valuable insight into efficiency of a CDN-type of solution to large scale streaming services. We find that the systems exhibits good performance and low resource usage.

关键词： content distribution network video streaming caching TV over IP

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Share with thy neighbors

Share with thy neighbors

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14th conference on multimedia computing and networking 2007

作者： Chandra, Surendar Yu, Xuwen Univ Notre Dame Dept Comp Sci & Engn Notre Dame IN 46556 USA

ISBN: (纸本)9780819466174

Peer to peer (P2P) systems are traditionally designed to scale to a large number of nodes. However, we focus on scenarios where the sharing is effected only among neighbors. Localized sharing is particularly attractive in scenarios where wide area network connectivity is undesirable, expensive or unavailable. On the other hand, local neighbors may not offer the wide variety of objects possible in a much larger system. The goal of this paper is to investigate a P2P system that shares contents with its neighbors. We analyze the sharing behavior of Apple iTunes users in an University setting. iTunes restricts the sharing of audio and video objects to peers within the same LAN sub-network. We show that users are already making a significant amount of content available for local sharing. We show that these systems are not appropriate for applications that require access to a specific object. We argue that mechanisms that allow the user to specify classes of interesting objects are better suited for these systems. Mechanisms such as bloom filters can allow each peer to summarize the contents available in the neighborhood, reducing network search overhead. This research can form the basis for future storage systems that utilize the shared storage available in neighbors and build a probabilistic storage for local consumption.

关键词： multimedia sharing localized sharing

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CompatPM: Enabling energy efficient multimedia workloads for distributed mobile platforms

CompatPM: Enabling energy efficient multimedia workloads for...

引用

14th conference on multimedia computing and networking 2007

作者： Nathuji, Ripal O'Hara, Keith J. Schwan, Karsten Balch, Tucker Georgia Inst Technol Coll Comp Atlanta GA 30332 USA

ISBN: (纸本)9780819466174

The computation and communication abilities of modern platforms are enabling increasingly capable cooperative distributed mobile systems. An example is distributed multimedia processing of sensor data in robots deployed for search and rescue, where a system manager can exploit the application's cooperative nature to optimize the distribution of roles and tasks in order to successfully accomplish the mission. Because of limited battery capacities, a critical task a manager must perform is online energy management. While support for power management has become common for the components that populate mobile platforms, what is lacking is integration and explicit coordination across the different management actions performed in a variety of system layers. This papers develops an integration approach for distributed multimedia applications, where a global manager specifies both a power operating point and a workload for a node to execute. Surprisingly, when jointly considering power and QoS, experimental evaluations show that using a simple deadline-driven approach to assigning frequencies can be non-optimal. These trends are further affected by certain characteristics of underlying power management mechanisms, which in our research, are identified as groupings that classify component power management as "compatible" (VFC) or "incompatible" (VFI) with voltage and frequency scaling. We build on these findings to develop CompatPM, a vertically integrated control strategy for power management in distributed mobile systems. Experimental evaluations of CompatPM indicate average energy improvements of 8% when platform resources are managed jointly rather than independently, demonstrating that previous attempts to maximize battery life by simply minimizing frequency are inappropriate from a platform-level perspective.

关键词： power management distributed mobile systems

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Resource estimation methodology for multimedia applications

Resource estimation methodology for multimedia applications

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14th conference on multimedia computing and networking 2007

作者： Kalva, Hari Shankar, Ravi Patel, Tuhina Cruz, Camilo Florida Atlantic Univ Dept Comp Sci & Engn Boca Raton FL 33431 USA

ISBN: (纸本)9780819466174

Reducing the product development cycle time is one of the most important and challenging problems faced by the industry today. As the functionality and complexity of devices increases, so does the time required to design, test, and develop the devices. Developing products rapidly in the face of this increasing complexity requires new methodologies and tools. This paper presents a methodology for estimating the resources consumed by a video decoder. The proposed methodology enables resource estimation based on high level user requirements. Component architecture for a H.264 video decoder is developed to enable design space exploration. The resources required to decode H.264 video are estimated based on a measure of the complexity of the H.264 bitstreams and the target architecture. The proposed approach is based on the hypothesis that the complexity of a H.264 video bitstream significantly influences resource consumption and the complexity of a bitstream can thus be used to determine resource estimation. The bitstream complexity is characterized to capture the data dependencies using a process called Bitstream Abstraction. The decoder is componentized and component level resource requirements determined in a process called Decoder Abstraction. The proposed methodology uses Bitstream Abstraction together with Decoder Abstraction to estimate resource requirements. A component model for the H.264 video decoder is developed. Resources consumed by each component are determined using the VTune performance analyzer. These resource estimates and video bitstream complexity are used in developing a parametric model for resource estimation based on bitstrearn complexity. The proposed methodology enables high level resource estimation for multimedia applications without a need for extensive and time consuming simulations.

关键词： resource estimation H.264 components multimedia architecture

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Resource management in a shared infrastructure video CDN

Resource management in a shared infrastructure video CDN

引用

14th conference on multimedia computing and networking 2007

作者： Cahill, Adrian J. Sreenan, Cormac J. Natl Univ Ireland Univ Coll Cork Dept Comp Sci Mobile & Internet Syst Lab Cork Ireland

ISBN: (纸本)9780819466174

In any large scale distribution architecture, considerable thought needs to be given to resource management, particularly in the case of high quality TV on-demand. This work presents a globally accessible network storage architecture operating over a shared infrastructure, termed Video Content Distribution Network (VCDN). The goal of which is to store all TV content broadcast over a period of time within the network and make it available to clients in an on-demand fashion. This paper evaluates a number of content placement approaches in terms of their ability to efficiently manage system resources. Due to the dynamic viewing patterns associated with TV viewing, the effectiveness of content placement is expected to chan(ye over time, therefore so too should the content placement. The placement of content within such a system is the single most influential factor in resource usage. Intuitively, the further content is placed from a requesting client, the higher the total bandwidth requirements are. Likewise, the more replicas of an object that are distributed throughout the network, the higher the storage costs will be. Ideally, the placement algorithm should consider both these resources when making placement decisions. Another desirable property of the placement algorithm, is that it should be able to converge on a placement solution quickly. A number of placement algorithms are examined, each with different properties, such as minimizing delivery path. There are a large number of variables in such a system, which are examined and their impact on the algorithms performance is shown.

关键词： Video Network architectures Computer simulations Internet Computer architecture Digital video recorders multimedia Reliability Computer science computing systems

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Efficient rate-distortion optimized media streaming for tree-reducible packet dependencies

Efficient rate-distortion optimized media streaming for tree...

引用

conference on multimedia computing and networking 2006

作者： Röder, M Cardinal, J Hamzaoui, R Univ Konstanz Dept Comp & Informat Sci D-7750 Constance Germany

ISBN: (纸本)0819461113

In packetized media streaming systems, packet dependencies are often modeled as a directed acyclic graph called the dependency graph. We consider the situation where the dependency graph is reducible to a tree. This occurs, for instance, in MPEG1 video streams that are packetized at the frame level. Other video coding standards such as H.264 also allow tree-reducible dependencies. We propose in this context efficient dynamic programming algorithms for finding rate-distortion optimal transmission policies. The proposed algorithms are much faster than previous exact algorithms developed for arbitrary dependency graphs.

关键词： Computer programming Distortion Video Algorithm development multimedia Systems modeling Video coding Receivers Reconstruction algorithms computing systems

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Correlation-aware multimedia content distribution in overlay networks

Correlation-aware multimedia content distribution in overlay...

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conference on multimedia computing and networking 2006

作者： Zhu, Y Li, BC Univ Toronto Dept Elect & Comp Engn Toronto ON M5S 3G4 Canada

ISBN: (纸本)0819461113

We address the question: What is the best way to construct a mesh overlay topology for mulfimedia content distribution, such that the highest streaming rate can be achieved? We model overlay capacity correlations as linear capacity constraints (LCC) and propose a distributed algorithm that constructs an overlay mesh which incorporates heuristically inferred linear capacity constraints. Our simulations results confirm the accuracy of representing overlays using our LCC model and show the LCC-overlay achieving substantial improvement in achievable flow rate.

关键词： overlay networks overlay construction peer-to-peer networks network protocol

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