基于流媒体技术的非实时教学VOD系统关键技术研究与系统开发
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摘要
流媒体VOD教学能够满足连续媒体实时性和高吞吐量的要求,解决了以视频、音频信息为代表的多媒体信息资源在中低带宽网上的传输问题,增强了学习者的主动性和视频、音频资源的可控制性,更好地满足了学习者的学习需求。VOD网络教学已经成为现代教育流行的教学模式。
本论文主要研究流媒体关键技术及其在非实时教学系统中的应用。论文首先从流媒体的基本原理入手,介绍了流媒体的相关格式,如常见的媒体压缩格式(JPEG系列标准)、微软的流式媒体格式(ASF)等。然后,结合流媒体的网络传输特征,详细介绍了实时传输协议(RTP)和实时流化协议(RTSP),并从bprobe改进算法和追尾算法中得到启发,重点研究了一种基于RTP/RTCP的带宽自适应传输策略的校园网VOD应用。
本论文的核心是研究流媒体教学系统音视频服务器技术。通过对服务器进行数学建模分析得出结论:采用大容量点播服务器协同工作是提高点播系统服务质量的关键,并由此设计了视频服务器模型。论文还研究流了媒体教学系统中音视频同步问题。使得音视频的同步也通过时间戳、缓冲区等方法的使用得以较好的解决。
最后在调度算法方面,通过对比分析知道补丁流调度算法性能优于其他基于成批调度的流合并算法的原因,这种算法利用了补丁策略的特点,从而可以获得更好的性能,并把经过改进的补丁流调度算法移植到校园VOD教学系统中。
Stream medium VOD teaching is able to satisfy continuation medium real time nature and height handling capacity request, transmission problem catch with a net going ahead in low bandwidth of middle having resolved the multi-media information resources taking video frequency, VF information as representative, the initiative having strengthened a learner composes in reply video frequency, VF resource's but under the control of, studying having satisfied a learner much better needs. VOD network teaching already becomes the popular teaching of modern education pattern.
The thesis studies the stream medium key technology and applies to being not that real time teaching system hits the target mainly. The thesis complies with stream medium basal principle first starting, medium compression form (JPEG series standard), Microsoft stream style medium form (ASF) having introduced the stream medium relevance form, if common etc. Comply with bprobe improving an algorithm and going after the tail algorithm drawing inspiration from together the union stream medium network transmission characteristic and then, the agreement (RTSP) having introduced the real time transmission agreement (RTP) and the real time fluidization detailedly, concentrate on having studied one kind of RTP/RTCP-based bandwidth self fit in with transfers tactics in school VOD net.
The thesis core is the technology studying the stream medium teaching system tone video frequency server. Come to a conclusion by the fact that the mathematics being in progress to the server builds model analysis: Adopt the high-capacity dibble seeding server associate to be the key improving dibble seeding system service quality,and Designed the model of the VOD server. The thesis returns the synchro problem back to the medium teaching system alto voice and video frequency having studied a stream. Feasible tone video frequency synchronism also passes method sigmatism such as time stamp, buffer area so that can fairly good solving.
In the field of controller algorithm finally, flow to combine algorithmic cause by the fact that comparative analysis knows the patch stream controller algorithm function is better than managing other owing to bulk, this algorithm has made use of patch tactics characteristic, can gain the much better function thereby. And the improved flow scheduling algorithm patch transplanted to the campus VOD Teaching System.
本论文主要研究流媒体关键技术及其在非实时教学系统中的应用。论文首先从流媒体的基本原理入手,介绍了流媒体的相关格式,如常见的媒体压缩格式(JPEG系列标准)、微软的流式媒体格式(ASF)等。然后,结合流媒体的网络传输特征,详细介绍了实时传输协议(RTP)和实时流化协议(RTSP),并从bprobe改进算法和追尾算法中得到启发,重点研究了一种基于RTP/RTCP的带宽自适应传输策略的校园网VOD应用。
本论文的核心是研究流媒体教学系统音视频服务器技术。通过对服务器进行数学建模分析得出结论:采用大容量点播服务器协同工作是提高点播系统服务质量的关键,并由此设计了视频服务器模型。论文还研究流了媒体教学系统中音视频同步问题。使得音视频的同步也通过时间戳、缓冲区等方法的使用得以较好的解决。
最后在调度算法方面,通过对比分析知道补丁流调度算法性能优于其他基于成批调度的流合并算法的原因,这种算法利用了补丁策略的特点,从而可以获得更好的性能,并把经过改进的补丁流调度算法移植到校园VOD教学系统中。
Stream medium VOD teaching is able to satisfy continuation medium real time nature and height handling capacity request, transmission problem catch with a net going ahead in low bandwidth of middle having resolved the multi-media information resources taking video frequency, VF information as representative, the initiative having strengthened a learner composes in reply video frequency, VF resource's but under the control of, studying having satisfied a learner much better needs. VOD network teaching already becomes the popular teaching of modern education pattern.
The thesis studies the stream medium key technology and applies to being not that real time teaching system hits the target mainly. The thesis complies with stream medium basal principle first starting, medium compression form (JPEG series standard), Microsoft stream style medium form (ASF) having introduced the stream medium relevance form, if common etc. Comply with bprobe improving an algorithm and going after the tail algorithm drawing inspiration from together the union stream medium network transmission characteristic and then, the agreement (RTSP) having introduced the real time transmission agreement (RTP) and the real time fluidization detailedly, concentrate on having studied one kind of RTP/RTCP-based bandwidth self fit in with transfers tactics in school VOD net.
The thesis core is the technology studying the stream medium teaching system tone video frequency server. Come to a conclusion by the fact that the mathematics being in progress to the server builds model analysis: Adopt the high-capacity dibble seeding server associate to be the key improving dibble seeding system service quality,and Designed the model of the VOD server. The thesis returns the synchro problem back to the medium teaching system alto voice and video frequency having studied a stream. Feasible tone video frequency synchronism also passes method sigmatism such as time stamp, buffer area so that can fairly good solving.
In the field of controller algorithm finally, flow to combine algorithmic cause by the fact that comparative analysis knows the patch stream controller algorithm function is better than managing other owing to bulk, this algorithm has made use of patch tactics characteristic, can gain the much better function thereby. And the improved flow scheduling algorithm patch transplanted to the campus VOD Teaching System.
引文
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2 钟玉琢.视频和图像编码技术进展探讨.中国计算机报.2002.37
3 钟玉琢,向哲,沈洪.流媒体和视频服务器[M].清华大学出版社,2003.183-306
4 兰少华,杨余旺,吕建勇,TCP/IP网络与协议,清华大学出版社,2006
5 钟玉琢,向哲,沈洪.流媒体和视频服务器[M].清华大学出版社,2003.8-23
6 范作栋,戴青,张睿琳.基于流媒体技术的远程教育平台的设计与实现.微计算机信息,2006.1-6,432-435
7 黄伟红,孙正兴,张福炎.Internet视频流中的自适应拥塞控制技术研究[J].计算机学报,2001,08.23-25
8 谢高岗,汤艳霞,张大方,李忠诚.带宽测量实验研究及其算法改进[J],电子学报,2002,S1,18-21
9 李栋,贾惠波.多种网络带宽测量算法及其比较,计算机工程与应用,2003,4,23-25
10 张占军,韩承德,杨学良.多媒体实时传输协议RTP[J].计算机工程与应用,2001.4.6-9
11 白木,周洁.视频服务器的结构、关键技术及应用,有线电视技术.2002.15.63-70
12 宋军,顾冠群.多媒体通信媒体间同步技术综述[J].电信科学,2006,12(9).14-19
13 张丽.流媒体技术大全[M].中国青年出版社,2001
14 覃少华,李子木,蔡青松,等.基于代理缓存的流媒体动态调度算法研究[J].计算机学报,2005,28(2).185-194.
15 Peng wu,Wenwu zhu,streaming video over the internet,approaches and directions[j].IEEE transactions on circuits and systems for video technology,2001,11(3).282-300
16 Stoica Ion,Zhang Hui,Eugene N T S,A hierarchical fair service curve algorithms for link-sharing,real-time and priority services.IEEE/ACM Trans on Networking.2000,8(2).185-199
17 Peterson L L,Davie B S.Computer Networks:A System Approach,2ed,Morgan Kaufman.2000,456-457
18 D.C.Stephens,J.C.R.Bennett,H.Zhang.Implementing scheduling algorithm in high-speed networks.IEEE Journal on Selected Areas in Communications,17(6).June,1997,1145-1159
19 Wu D,Hou YT.Streaming Video over the Internet,Approaches and Directions.IEEE Transactions on Circuits and Systems for Video Technology,2001,11(3)
20 Perez-luguc M J.Little T D C.A Temporal Reference Frame Work for Multi-Media Synchronization[J].IEEE J.SAC,2003,14(1).25-27.
21 Shockmanner W.A Transport Protocol for Real-time Applications[J].Mini-micro System,1999,18(3).14-22
22 MILOJICIC D S,KALOGERAKI V,et al;Peer-to-Peer computer[M];HP Laboratories Palo Alto HPL.2002-57
23 Shockmanner W.A Transport Protocol for Real-time Applications[J].Mini-micro System,2004,18(3).14-22
24 Gu Guanqun,Pan Jianping.Communication Services and Protocols to support Cooperative Work over High-Speed Packet Networks[C].In Proceedings of International Workshop on CSCW in Design,Beijing,1996
25 Hua Chen,Yaoxue Zhang,Chen Kangfu.Multimedia Quality of Service (QoS)Classification and Negotiation Management[J].Chinese Journal of Electronics,1998.7.1.44-48
26 Huang H,Tsang F H K.Hierarchical Scheduling with Adaptive Weights for W-ATM.IEICE Trans.Comm.2000,E83-B(2).313-320.
27 Crawley E,Nair R,Rajagopalan B,Sandick H.A framework for QoS-based routing in the internet.IETF RFC 2386,August,1998
28 陈启美、李嘉编著:现代数据通信教程,南京大学出版社,2000.3,P280,P282.
29 钟玉琢,王琪,贺玉文.基于对象的多媒体数据压缩编码国际标准MPEG-4及其校验模[M],科学出版社,2000
30 许延.存储媒体的媒体内同步反馈控制算法[J].电子学报,2002,14(1-2).228.
31 任延珍.基于RTP/RTCP协议的实时数据传输与同步控制策略[J].计算机工程与应用,2003(11).44-46.
32 汤光明.多媒体复合同步模型[J].计算机工程与设计,2001,22(5):32-36
33 陈桦,张尧学,马洪军.多媒体服务质量(QoS)协商控制系统[J].清华大学学报,1998.38(1):36-39
34 刘杰平,余英林.一种基于多描述编码的视频传输方案[J].计算机工程与应用.2004.35.122-124
35 程国华,周源华,赵谊虹.一种对信道差错鲁棒的多描述编码算法[J].上海交通大学学报.2004,11.5-8
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