| 实时流媒体传输中的差错控制与恢复技术 |
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| 引用本文： | 张拥军,张怡,彭宇行,曾友春. 实时流媒体传输中的差错控制与恢复技术[J]. 国防科技大学学报, 2003, 25(3): 74-78 |
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| 作者姓名： | 张拥军 张怡 彭宇行 曾友春 |
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| 作者单位： | 1. 国防科技大学计算机学院,湖南,长沙,410073
2. 安徽蚌埠汽车管理学院,安徽,蚌埠,233011 |
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| 基金项目： | 国家863高技术资助项目(2001AA112072) |
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| 摘 要： | 在Internet传送有一定的QoS保证的实时流媒体是多媒体应用的一个主要发展方向。但Internet上的数据传输时常出现丢包现象,不采取恢复措施,这必然导致视频质量的下降。如何提高视频传输质量,且保证它的实时性,是目前研究热点。以MPEG-4文件为视频流,研究了网络传输丢包对视频质量的影响,在此基础上提出了有选择地重传重要数据的恢复方法,来提高实时视频的图像质量;并根据RTP协议,提出CR-RTP协议,以对视频数据恢复重传的支持。
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| 关 键 词： | Internet 实时媒体流 差错控制与恢复 MPEG-4 |
| 文章编号： | 1001-2486(2003)03-0074-05 |
| 收稿时间： | 2002-11-18 |
| 修稿时间： | 2002-11-18 |
Error Control and Recovery Technology in Real-time Media Stream Transmission |
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| ZHANG Yongjun,ZHANG Yi,PENG Yuxing and ZENG Youchun. Error Control and Recovery Technology in Real-time Media Stream Transmission[J]. Journal of National University of Defense Technology, 2003, 25(3): 74-78 |
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| Authors: | ZHANG Yongjun ZHANG Yi PENG Yuxing ZENG Youchun |
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| Abstract: | To provide quality guaranteed real-time video stream in Internet is one of the main contents of multimedia application. But packet loss often occurs in data transmission across Internet, if no recovery measure is adopted, a drop in video quality will occur. Current research focuses on how to improve the quality of video stream and guarantee its real-time character. This paper studied the influence of packet loss on video quality based on MPEG-4 stream, presents a retransmit-important-data-based error recovery method, in order to improve the quality of real-time video stream. And according to RTP protocol, proposes a new CR-RTP protocol to support the retransmission of video data. |
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| Keywords: | Internet real-time video error recovery and control MPEG-4 |
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