Research On Real-time Transmission Mechanism Of Streaming Media Network Based On H.265

With the continuous development of Internet technology,streaming media has greatly improved people's experience of network applications.The traditional Internet transmission has a single form of expression,and the real-time streaming technology integrates a variety of information such as audio,video,and text,and has become the main solution for real-time video transmission.At present,most data services are transmitted based on the TCP protocol,and the transmission quality is guaranteed through the congestion control mechanism of TCP protocol itself.However,due to the retransmission mechanism of the TCP protocol in practical applications,the UDP protocol is often used for video data transmission,the UDP protocol itself does not have a congestion control mechanism,and it will preempt bandwidth with the TCP stream when the network is congested.Therefore,it is of practical significance to study congestion control mechanisms suitable for video data transmission and friendly to TCP streams.This subject takes H.265 encoded video data as the research object,introduces and analyzes RTP protocol,RTCP protocol and RTSP protocol,studies the causes of network congestion and the classification of congestion control strategies,and designs the overall transmission mechanism verification platform,and introduces the coding module,streaming media server module and client module respectively.Since the transmission of video data has requirements for both delay jitter and stability,the model-based TFRC algorithm is used for the congestion control mechanism,and an improved TFRC algorithm is proposed based on the TFRC algorithm.In view of the deficiencies of the TFRC algorithm in the congestion avoidance phase,the throughput formula was revised from two aspects,considering the change of the adjacent round-trip time delay and the adjustment factor to adjust the loss event rate.Then use NS-2 to perform performance test on the improved TFRC algorithm,and verify from four aspects of TCP friendly performance,throughput change,delay jitter change and packet loss rate change.Experimental results show that the improved TFRC algorithm has improved in these aspects compared with the traditional TFRC algorithm,and is more suitable for H.265 encoded video streaming.