An Adaptive Live Broadcasting Scheme for Time-Shifting Playback
| Autor: | Hung-Chang Yang, 楊宏昌 |
|---|---|
| Rok vydání: | 2001 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 89 In the recent year, the developments in computer and communication technologies have made it possible to provide interactive multimedia services. More and more households are connecting to the Internet to get popular information and hot news in addition to newspaper, magazine, radio and TV. However, real-time information is the hottest one that people want to access. People could connect to Internet to watch the live video immediately. But it is impractical in the near future due to the video server has to prepare or reserve a huge bandwidth. Therefore, how to use the limited bandwidth to accommodate as many users’ requests as possible is vital. Since many people want to watch the same hot live video, the required bandwidth of live video is possible to be shared. If we increase the probability of sharing the bandwidth for the same video and using local disk to buffer posterior video data, we can reduce the require bandwidth of the video server. However, the characteristics of live video are playing/recording in real-time and its production rate is equal to playback rate. We cannot pre-fetch the video and store them in the disk of video server beforehand. Furthermore, the clients cannot fast-download the posterior portion of video. Many schemes are proposed to reduce the bandwidth requirements for stored popular videos, but they cannot be used to support live video broadcast perfectly. Herein, we propose a new broadcasting scheme, called Adaptive Live Broadcasting (ALB) scheme, which supports time-shifting playback and perform well over a wide range of request arrival rates. Time-shifting playback can be classified into two playback types: the first one is it allows the late user to watch an on-going live video from the beginning while recording is still in progress. Another one is its timeliness is very important. The broadcast contents per hour of the live video are different. The older news would be abandoned, and the recent news would be added. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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