Synchronization Control and System Development for Multicast Multiple-Stream Multimedia Presentations
| Autor: | Hsu-Yang Kung, 龔旭陽 |
|---|---|
| Rok vydání: | 2000 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 88 The Internet explosion is driving the need for multiple-stream multimedia presentation systems, which provide multiple users with smooth multimedia services such as movie distribution and tele-medicine. These kinds of visual systems are composed of multiple media streams, such as video, audio, text, and image streams, which medium volume is large. Therefore, it is a real challenge to have smooth multiple-stream multimedia presentations over Internet, which usually provides insufficient network bandwidth. The essential problems and research topics in designing multiple-stream multimedia presentation systems are as follows. 1. The definition and construction of presentation schedule for multiple-stream multimedia presentations. An author can concisely define the temporal relation between/among media streams and conveniently construct the desired presentation schedule. Based on the presentation schedule, the server transmits media units to clients and the clients present these media units accordingly. 2. The synchronization and presentation control for multiple-stream multimedia presentations. Multiple streams mean that media streams are retrieved from a number of media bases and are transmitted via different communication channels with diverse QoS (Quality-of-Service) requirements. Furthermore, the transmission delay in Internet is always unpredictable. Therefore, different network devices and links that have diverse communication capabilities and network traffic situations always disturb the pre-defined temporal relation of media streams. In order to compensate for temporal anomalies, multimedia synchronization is the essential requirement to achieve smooth coordination and cooperation among various media. For some multimedia presentations, if characteristic of these presentations is to keep the actual presentation time length equal to the nominal presentation time length as much as possible, a time-oriented presentation control is needed. On the other hand, if characteristic of these presentations is to keep the completeness of a medium presentation as much as possible, a content-oriented presentation control is needed. Therefore, suitable presentation schemes for different presentation purposes are required. 3. Reliable multiple-stream multimedia transmission and presentation. In the past, people always thought that audio and video transmission can tolerate loss and thus UDP is adopted in order to achieve the real-time requirement. However, some applications do need lossless transmission of audio and video, e.g., the transmission of I-frames in an MPEG stream and a supersonic diagnosis over Internet in remote diagnoses. For the remote diagnoses, the corresponding audio and video information is very critical. The main reason is that if some important information is contained in the lost audio or video packets, some fault diagnoses occur. Therefore, a practical way to achieve the reliability over Internet is to adopt TCP. However, in order to avoid the overhead of duplicate slow-start flow control for the TCP-based applications, a suitable flow adaptation and presentation control can improve the presentation distortion is required. 4. Multicast communication software and network architecture. A multi-party multiple-stream multimedia presentation is based on the multicast communications. Therefore, it is necessary to design a feasible multicast multimedia software and network architecture, which is based on the Internet MBone. The main contribution of this dissertation is that we have the comprehensive study of synchronization/presentation control and develop the Multicast Visual System for multicast multiple-stream multimedia presentations. Furthermore, we propose the PARK (Pause-And-Run approach for K-stream) approach, which achieves flow and presentation adaptation control, for reliable TCP-based multiple-stream multimedia presentations. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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