Solving method for packet loss of IPTV

Abstract

The invention provides a resolving method for network television live broadcast packet loss, wherein, a live broadcast server buffers a segment of recently broadcasted streaming media data in the form of packet during the multicast process at first; when a client is accessed into a certain live broadcast channel, multicast groups are added and a reliable transmission control protocol link is established; if the client detects of multicast packet loss, the live broadcast server is requested to retransmit lost packets through the transmission control protocol link, and packet-loss data is restored. By adoption of the method of the invention, the problem of live broadcast packet loss in a broadband access network can be solved by small overhead and user experience quality is improved, and simultaneously broadband access requirements of live broadcast services to broadband access networks can be lowered and network construction cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of Internet Protocol Television (hereinafter referred to as IPTV), and in particular relates to a solution to IPTV live broadcast packet loss. Background technique [0002] With the development of broadband access technology, data communication technology and multimedia technology, the IPTV service as a broadband value-added service has developed vigorously. In the IPTV business, the live broadcast service occupies a very important position and is one of the basic services. The live broadcast service on the IP network generally adopts IP multicast mode to replicate and transmit the video stream, and its transport layer protocol is a user datagram protocol (UDP for short). The UDP protocol does not guarantee the reliability of communication, even if a packet is lost during transmission, it cannot be recovered. In this way, if there is no certain recovery mechanism, decoding will inevitably fail on the user ...

AI Technical Summary

Problems solved by technology

The UDP protocol does not guarantee the reliability of communication, even if a packet is lost during transmission, it cannot be recovered

In this way, if there is no certain recovery mechanism, decoding will inevitably fail on the user side, and abnormal phenomena such as mosaics and pauses will appear on the screen, which will seriously affect the viewing effect

At the same time, the IPTV service and the original Internet service are carried by the same broadband access network, and instantaneous packet loss caused by sudden conflicts is inevitable

In addition, the typical Motion Picture Experts Group (hereinafter referred to as MPEG) code stream is variable-rate, and the key frame has the largest amount of information, that is, the key frame information is most likely to cause packet loss. According to the MPEG codec rules, The loss of a key frame not only affects its own decoding failure, but also causes the decoding failure of other associated frames, which will cause more serious video abnormalities

In actual engineering applications, the above phenomenon does occur, and the solution is generally to increase the line bandwidth, which undoubtedly increases the cost of network construction

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