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Distributed Multimedia Systems(DMMS)
This document discusses distributed multimedia systems (DMMS). It defines DMMS as consisting of multimedia databases, proxy servers, and clients intended to distribute multimedia content over networks. Key requirements of DMMS include supporting continuous media like audio and video, quality of service management to ensure requests are met, and multiparty communications. The document outlines the basic DMMS architecture and discusses factors like server bandwidth that affect the system. It also covers approaches like proxy-based and clustered servers, as well as quality of service management through techniques such as buffering, bandwidth reservation and traffic shaping. Examples of DMMS applications include digital libraries, distance learning, and audio/video streaming.
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Introduction to DMMS, its structure and outline of key topics.
Defines distributed systems and DMMS including components like databases, servers, and clients.
Key features such as multimedia stream delivery, QoS, flexibility, availability, and scalability.
Discusses critical needs such as high bandwidth, QoS management, and support for multiparty communication.
Outlines the basic components of DMMS including databases, servers, and networks.
Factors like server bandwidth, cache space, copies of content, and client load impacting performance.
Different strategies for managing multimedia delivery, including proxy-based and caching methods.
Importance of QoS, its real-time requirements, and key metrics like bandwidth and latency.
Describes resource management in QoS, including CPU, bandwidth, and buffer requirements.
Reasons for QoS necessity such as content accuracy, quality variation, timing, and performance.
Functions of QoS management software in resource negotiation and admission control.
Techniques like buffering, compression, bandwidth reservation, and traffic shaping for QoS.
Various uses of DMMS including digital libraries, distance learning, and multimedia streaming.
Summarizes findings on DMMS and emphasizes ongoing challenges and the importance of QoS.
List of references used for compiling the DMMS presentation content.
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Distributed Multimedia Systems(DMMS)
- 1. DISTRIBUTED MULTIMEDIA SYSTEM(DMMS) Presented by: NidhiBaranwal MCA 4th sem
- 2. TABLE OF CONTENTS 1.INTRODUCTION 2.CHARACTERISTICS 3.REQUIREMENTSOF DMMS 4.ARCHITECTURE OF DMMS 5.QoS(QUALITY OF SERVICE) 6.APPLICATIONS OF DMMS 7.CONCLUSION
- 3. INTRODUCTION A distributedsystem is designed to support the development of applications and services which have a physical architecture consisting of multiple autonomous processing elements that do not share primary memory but cooperate by sending messages over a communication network.
- 4. INTRODUCTION Distributed multimedia systemsconsist of multimedia databases, proxy and information servers, and clients, and are intended to for the distribution of multimedia content over the networks.
- 5. CHARACTERISTICS Delivering thestreams of multimedia data Audio samples, Video frames To meet the timing requirements QoS (Quality of Service) Flexibility (adapting to user needs) Availability Scalability
- 6. REQUIREMENTS OF DMMS Providing support for continuous media types, such as audio, video and animation. The introduction of such continuous media data to distributed systems demands the need for continuous data transfers over relatively long periods of time. High bandwidth is required. The second requirement of distributed multimedia applications is the need for sophisticated quality of service (QoS) management. Ensuring that the service requests should be met. Supporting multiparty communications. Many distributed multimedia applications are concerned with interactions between dispersed groups of users. E.g. remote conference application.
- 7. BASIC ARTCHITECTURE Database Proxy/information servers Clients Wired or wireless networks
- 8. FACTORS THAT AFFECTTHE SYSTEM Server bandwidth-Adequate bandwidth of the network to support media streams Cache space- Sufficient cache space needed for the fast delivery Number of copies-Adequate number of copies of movies at the multimedia databases (MMDs) The number of clients- Increasing number of clients increase the server work load
- 9. APPROACHES Proxy-based approach Parallel or clustered servers approach Varies depending on clip duration, number of clients, bandwidth available, etc Caching- Caching allows nodes to quickly fetch the required documents without incurring the need to contact the original host.
- 10. QUALITY OF SERVICE(QoS) DMMS are real-time systems as data must be delivered on time “Acceptable” service is measured by: Bandwidth (Throughput) Latency (Access time) Data Loss Rate (Acceptable loss ratio)
- 11. QoS MANAGEMENT “QoSManagement” Process of managing resources to meet the Acceptable service criteria. Resources include: CPU / processing power Network bandwidth Buffer memory(on both ends) Other factors affecting communication
- 12. WHY WE NEEDQos 1. We may get the wrong video – Bad search facilities 2. We may get the wrong quality-variation – E.g too high quality level for a PDA 3. We may get the proper variation in bad quality – E.g jitter is too high 4. We may get the video at the wrong time
- 13. QoS MANAGERS Softwarethat runs on network nodes which have two main functions: QoS negotiation: get requirements from apps and checks feasibility versus available resources. Admission control: If negotiation succeeds, provides a "resource contract" that guarantees reservation of resources for a certain time.
- 14. WAYS TO ACHIEVEQoS Buffering (on both ends) Compression More load on the nodes, but that is fine Bandwidth Reservation Resource Scheduling Traffic Shaping Flow Specifications Stream Adaptation
- 15. APPLICATIONS OF DMMS DIGITALLIBRARIES DISTANCE LEARNING CONFERENC E AUDIO STREAMING VIDEO STREAMING E- COMMERCEAND MORE…..!!!!
- 16. CONCLUSION Let us realizethe fact that there is still a long way to go in DMS (Distributed Multimedia Systems). I presented an overview of DMS, discussed the major requirement of QoS Management. Thus summarized all the primary issues leading to the basics of DMS.
- 17. REFERENCES 1. http://encyclopedia.jrank.org/articles/pages/6729/Distributed 2. http://citeseerx.ist.psu.edu/viewdoc/summary 3.http://www.uio.no/studier/emner/matnat/ifi/INF5040/h09/l ectures/2009_11_09_dmms.pdf 4. http://www.mamcet.com/it/e-learning/7sem/gm/unit %20v/DISTRIBUTED%20MULTIMEDIA %20SYSTEMS.pdf 5. http://www-itec.uni- klu.ac.at/~laszlo/courses/DistSys_BP/network.pdf 6. http://ieeexplore.ieee.org/xpl/login.jsp? tp=&arnumber=611116&url=http%3A%2F %2Fieeexplore.ieee.org %2Fiel1%2F5%2F13353%2F00611116.pdf %3Farnumber%3D611116