基于IP组播的船载无线视频监控系统

文章给出了基于IP组播的无线视频监控系统，此系统主要实现对内河船舶船载目标的监控。给出了系统模型，描述了系统的核心模块和组播网络的结构，并介绍了网络组播软件的设计。     

省级远程视频监控系统的设计方案

提出了一个安全生产监督管理远程视频监控系统的设计方案,是采用GIS、GPS、流媒体、IP组播等技术手段构架的网络远程视频监控系统,该设计方案的目标是要达到对一个省的安全生产进行方便高效的监督管理.     

因特网上数字视频的组播传输

讨论了数字视频业务在因特网中的组播传输，重点对因特网中视频服务系统基于应用层组播传输的技术和体系进行了深入分析。     

一种基于IP组播的视频切换软件设计及应用

针对广泛使用的数字视频监控系统,设计了一种基于IP组播技术的视频监控与切换软件,实现对H.264格式视频的监控和在视频源与监视器之间进行选择切换.为提高视频流数据包的转发性能,将过滤、拆包、重组等处理过程放在网络接口驱动层实现,并且可以以组播方式将同一视频信号转发到不同的视频接收设备.实践证明,基于该软件构建的视频切换系统,能够满足视频转发的实时性要求,并可以使系统结构更简化,有效降低硬件成本.     

IP组播技术在视频中的应用

随着流媒体、视频等业务在Intemet上的相继开展，IP组播技术和应用开始快速发展。本文主要分析IP组播技术的产生、概念和特点，以及相关技术，最后介绍了IP组播技术在视频业务中的应用。     

基于组播和嵌入式技术的远程监控系统

介绍了基于IP组播技术和嵌入式uClinux技术的嵌入式远程视频监控系统结构与实现,该系统重点实现了嵌入式技术和IP组播技术的整合应用以及对系统实时性的优化.系统的服务端由嵌入式系统实现,可完成多个地点对同一场景的监控及一点对多点的监控.     

一种基于MPEG-4和IP组播的远程视频监控系统

本文主要介绍基于MPEG-4和IP组播的远程视频监控系统,重点介绍视频编解码硬件结构和软件设计中的关键技术。该系统可通过IP网络实时传送监控现场图像、声音和监控数据。     

基于改进组播算法的360度CSCW视频子系统研究

文章研究了一个基于视频流进程调度算法的CSCW视频子系统。系统特点采用了Winsock2实现视频组播通信，应用了360度全景成像技术和H．263视频编解码方案等。     

基于IP网络的数字音视频监控系统的设计与实现

提出了一种采用实时传输协议(RTP／RTCP)封装监控音视频数据并通过IP网络组播的方案。该系统在分析了监控音视频信息的网络传输实际需求的条件下，吸取了实时传输协议的基本思想和IP组播的设计方法。     

远程网络视频监控系统的设计与实现

提出了一种使用组播技术 ,用MPEG 4进行编解码的网络视频监控系统的设计与实现方法。文中首先介绍了系统的总体结构 ,然后重点讨论了系统中软件部分各主要功能模块的具体实现。     

基于虚拟机和软件路由器的组播实验网络研究

通过互联网传输视频会占用大量的网络带宽,而采用组播技术可以减小视频播放对带宽的占用,降低视频服务器的负载。目前只有部分硬件路由器具备组播功能,使用这些路由器搭建组播网络,需要较高的成本。文中提出了一种解决方案,利用虚拟化、软件路由等新兴技术,在虚拟机上组建由多个软件路由器组成的组播网络,搭建组播视频服务器,并通过测试组播网络中视频播放的效果证明方案的可行性。     

基于DirectShow的网络多媒体系统设计

讨论了Windows平台上的网络多媒体应用，采用了基于DirectShow技术的解决方案，将多播等网络通信技术无缝的嵌入到了DirectShow技术体系中。给出了一个应用多播技术的视频监控系统的应用实例。     

Multicast deflector

Technological evolution is leading telecommunications toward all-IP scenarios, where multiple services are transported as IP packets. Among these services is the broadcast of video. A possible mechanism for broadcasting multiple video channels over IP is to use IP multicast, and let each client decide about the reception of a channel. The secure IP multicast specified by the IETF MSEC working group is a candidate solution for securing these broadcast services. In this paper we propose a new solution for supporting the broadcast of multiple video channels which can be accessed only by authorized users; besides, when a video channel is not visualized in the last mile its transmission is temporarily suspended, so that the cable can be used for other services such as standard Internet access.     

时延约束下采用SVC编码的D2D协作视频多播传输方案

为缓解基站的视频流量过载，本文针对时延敏感的实时视频业务，设计一种D2D协作视频多播传输方案。该方案采用可伸缩视频编码（Scalable Video Coding, SVC）对视频流进行编码处理，利用SVC流的分层结构特征来应对多播信道间的差异性。在SVC编码的基础上，为了改善用户观看体验及提升用户所接收的视频质量，所提出的协作式视频传输方案引入有效吞吐量这一概念，在一定时延约束下，根据信道反馈信息灵活地对不同信道上的不同SVC视频层进行码率调整。仿真结果表明，所提出的方案能够有效地减小端到端时延，有效丢失率，提高有效吞吐量。      

P2P流媒体模型的资源传输机制

针对流媒体的点播和直播服务,提出了基于P2P的流媒体应用层多播和点播的解决方案,构建了基于超级节点和普通节点的两层体系结构的视频流媒体模型.描述了模型的总体结构,分析了资源传输机制.基于校园网对模型进行了测试,测试结果表明,模型能够实现基于流媒体应用的多点数据快速互传.     

Adaptive tree-based P2P video streaming multicast system under high peer-churn rate

This paper presents an adaptive tree-based P2P video streaming multicast system under high peer-churn rate. Because peers typically display dynamic and unstable behavior during the session, a P2P video streaming multicast tree must take into account both the link delay and peer stability in order to provide a seamless video streaming multicast service with low delay. Hence, we need to adaptively update the multicast tree according to its time-varying environments in order to obtain an effective tradeoff between the delay of the tree and the relative peer stability over multicast tree. Finally, simulation results are provided to demonstrate the performance of the proposed system.     

New Approach to Inter‐domain Multicast Protocols

IPTV broadcast channels and video content distribution are increasingly saturating network paths. New solutions based on inter‐domain multicast protocols could contribute to the enhancement of multimedia content distribution over the Internet. The aim of this paper is to propose new capabilities for an existing inter‐domain multicast protocol, the Protocol Independent Multicast‐Sparse Mode. We describe the modified protocol and analyze its behavior using newly developed tools based on an open‐source software simulator. The resulting protocol does not require topology information, which is advantageous for easier deployment. In addition, the adopted solution avoids inherent problems with inter‐domain multicast routing, such as multiple paths and path asymmetries.     

基于POWERPC823的嵌入式视频网络接入系统的研究

嵌入式视频网络接入终端是针对监控、电信、交通、银行等领域的监控产品。视频网络接入终端可将经编码器压缩后的视频信号直接以多播的方式送上局域网(10M／100M以太网)。本文叙述了阐述了系统的工作原理、研究方法、研究成果。     

Fair Bandwidth Allocation Using Effective Multicast Traffic Share in TDM-PONs

In this paper, the effects of optical traffic-sharing on the performance of multicast video delivery in terms of the efficiency of bandwidth allocation and the fairness of link-sharing are discussed for the downstream direction of a time-division-multiplexed passive optical network (TDM-PON). We analyze the practical issues associated with multicast packet switching and transmission control in a TDM-PON and also propose a fair bandwidth allocation mechanism, called share-based proportional bandwidth allocation (S-PBA), to effectively support multicast services. In order to provide an optical network unit with a fair amount of link bandwidth and high throughput independent of traffic type, S-PBA arbitrates the amount of unicast timeslot by using effective multicast traffic share, which is determined based on multicast traffic load distribution and traffic-sharing density. Analytic and simulation results clearly validate the effectiveness of the proposed mechanism. This work is applicable to multicast video delivery or multicast traffic transmission in general, such as voice traffic, or a combination of both in the case of video conferencing, for example.     

Hybrid Multicast and Segment‐Based Caching for VoD Services in LTE Networks

This paper proposes a novel video delivery scheme that reduces the bandwidth consumption cost from a video server to terminals in Long‐Term Evolution networks. This proposed scheme combines optimized hybrid multicast with a segment‐based caching strategy for use in environments where the maximum number of multicast channels is limited. The optimized hybrid multicast, allocation of multicast channels, and cache allocation are determined on the basis of a video's request rate, the related video's length, and the variable cost per unit size of a segment belonging to the related video. Performance evaluation results show that the proposed scheme reduces a video's delivery costs. This work is applicable to on‐demand TV services that feature asynchronous video content requests.