Method for monitoring service quality of H.264 multimedia communication

Abstract

A method for monitoring QoS in H.264 multimedia communication, which can realize the monitor of H.264 multimedia communication in band and reduce the extra expend of QoS monitor. The method uses the extension information mechanism of high layer media protocol H.264 itself to carry QoS report directly, and avoids using extra bandwidth, and realizes a "in band" QoS report mechanism; using extension information mechanism of H.264 such as SEI information and user self-defined data to transmit QoS report and monitoring transmission quality of H.264 multimedia communication can reduce extra bandwidth expend without affecting the communication of the existing H.264 protocol device; the method provides multiple protection measures to improve the reliability of RTCP / UDP based on the H.264 in band report.

Description

technical field [0001] The invention relates to the service quality monitoring of multimedia communication, in particular to the service quality monitoring of H.264 multimedia communication. Background technique [0002] With the rapid development of computer Internet (Internet) and mobile communication network, the application of streaming media technology is becoming more and more extensive, from online broadcasting, movie playing to distance teaching and online news websites, etc., all use streaming media technology. Currently, there are mainly two ways to transmit video and audio on the Internet: Download and Streaming. Streaming transmission is the continuous transmission of video / audio signals, and when the streaming media is played on the client computer, the rest continues to download in the background. There are two ways of streaming transmission (Progressive Streaming) and real-time streaming (Realtime Streaming). Live streaming is real-time delivery and is espec...

AI Technical Summary

Problems solved by technology

[0051] In practical application, the above-mentioned scheme has the following problems: adopting the QoS reporting mechanism of the auxiliary control protocol RTCP to realize the QoS monitoring to H.264 multimedia communication does not fully utilize the advantages of H.264 multimedia, RTCP is a kind of general QoS reporting mechanism, However, it is not suitable for specific media types such as H.264 with its own particularity and specific functions, because it does not take full advantage of the advantages of H.264 itself

[0052] Secondly, RTCP is another channel compared to RTP. It is implemented under the specific protocol framework such as H.323. It needs to open an additional logical channel and adopt the so-called "out-of-band" monitoring method, which brings additional overhead to the network transmission bandwidth. , leading to conflicts, which violates part of the purpose of the QoS mechanism to solve the problem of network congestion and make up for the defect of insufficient bandwidth, but further aggravates the problem in some poor network conditions

[0053] At the same time, the RTCP periodic reporting mechanism also brings bandwidth overhead, and as the number of communicating parties increases, the overhead will increase sharply. Similarly, when the network is congested, RTCP traffic will cause the problem to worsen

[0054] In addition, RTCP data packets are generally not protected by any protection mechanism, and RTCP is based on the UDP protocol, which is a connection-less transmission protocol, so the correct arrival of the report data packet cannot be guaranteed, resulting in the QoS mechanism itself not reliable enough

[0055] The main reason for this situation is that the multimedia communication framework of H.264 / RTP uses a common cooperation control protocol RTCP to transmit QoS reports to realize QoS monitoring. The transmission of QoS reports affects the network conditions and leads to conflicts

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