| 引用本文: | 张拥军,张怡,彭宇行,等.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.[点击复制] |
| ZHANG Yongjun,ZHANG Yi,PENG Yuxing,et al.Error Control and Recovery Technology in Real-time Media Stream Transmission[J].Journal of National University of Defense Technology,2003,25(3):74-78[点击复制] |
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| 实时流媒体传输中的差错控制与恢复技术 |
| 张拥军1, 张怡1, 彭宇行1, 曾友春2 |
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(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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| 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。 |
| 关键词: Internet 实时媒体流 差错控制与恢复 MPEG-4 |
| DOI： |
| 投稿日期：2002-11-18 |
| 基金项目:国家863高技术资助项目(2001AA112072) |
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| Error Control and Recovery Technology in Real-time Media Stream Transmission |
| ZHANG Yongjun1, ZHANG Yi1, PENG Yuxing1, ZENG Youchun2 |
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(1.College of Computer, National Univ. of Defense Technology，Changsha 410073，China;2.The Auto-management Institute of PLA,Bengbu 233011,China)
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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. |
| Keywords: Internet real-time video error recovery and control MPEG-4 |
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