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1.引言实时的视频数据传输具有数据量大、网络带宽要求高、延时敏感的特点。现有的网络一般不能够提供对渚如最小带宽、最大延时和丢包率等实时视频传输的至关重要的参数支持;不提供带宽预留这一实现稳定、优质视频服务的重要机制。所有这些不利因素,使得在当前网络上实时视频传输系统的设计和实现总是面临着众多棘手的问题。这些问题主要包括:①服务提供方的负载能力极大地受限于传输方式;②数据流量的失控;③QoS控制的困难。
1. Introduction Real-time video data transmission with a large amount of data, high network bandwidth requirements, delay-sensitive features. Existing networks are generally not able to provide crucial parameter support for real-time video transmission such as minimum bandwidth, maximum latency and packet loss rates; no provision is made for bandwidth reservation, an important mechanism for achieving stable, high quality video services. All these unfavorable factors make the design and implementation of real-time video transmission system on the current network always face many thorny problems. These problems include: ① service provider’s load capacity is greatly limited by the transmission mode; ② out of control of data traffic; ③ QoS control difficulties.