Topic_5_PT - CS3283 Distributed System Assignment Two...

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CS3283 Distributed System Assignment Two Distributed Multimedia Services and Real Time System Kong Pui Wing (SID:51014587) Chung Tin Chi (SID:51005112) Shek Wing Fung (SID: 51031690) Kwok Ho Yin (SID:50871108) Date : 29th Nov, 2010
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Topic 5 – Distributed Multimedia Services and Real Time System SID:51014587 1 1. Introduction Nowadays, information is explosion and technology is developing mature. People want to get the information or media from internet in an easy and fast method. Distributed Multimedia Services provide services which is helping people to get and share their media to other one on internet. Distributed Multimedia Services provide a network channel for people to get the media which is including large capacity data, such as audio, video and other time-based data elements. We will study on the Distributed Multimedia Services transmission how to provide a reliability, quality and interactive services to user. Distributed Multimedia Services also can provide a lot of advantages and benefits on the usage. We also find out distributed Multimedia Services has limitation on the management. In addition, we will find out what Real Time System is, how Real Time System work and what is the difficult on the using. We will find out what is the relationship and influence between Distributed Multimedia Services and Real Time System. At last, we will show some example of Distributed Multimedia Services and Real Time System what kind of services and which level is providing on the current internet.
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SID:51031690 2 2. Distributed Multimedia Service In this chapter, we will talk about the operation of distributed multimedia service. Nowadays, distributed multimedia service provides continuous media such as video, audio or animation. The introduction of such continuous media data to distributed systems demands the need for continuous data transfers over relatively long periods of time. For example, playing a video from a remote website implies that the timeliness of such media transmission must be maintained in the course of the continuous media presentation. On the above figure, the service component model mainly contains input and output ports which are responsible for sending message and receiving message, respectively. Moreover, the input port is associated with the message queue for asynchronous communication between service components. Generally, the service component model consists of four items: c Function name: The description of the service function provided by the service component. c Service code: The code of representing the service implementation. c The static meta-data: It contains the location of the service component, the input quality requirements of the service component such as media format, frame rate and the output quality properties of the service component. c
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Topic_5_PT - CS3283 Distributed System Assignment Two...

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