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Solving method for packet loss of IPTV

A network TV and packet loss technology, which is applied in the field of IPTV live broadcast packet loss, can solve problems that affect the viewing effect, packet loss, video abnormality, etc., reduce access bandwidth requirements, improve user experience quality, and reduce network construction costs Effect

Inactive Publication Date: 2008-06-11
ZTE CORP
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  • Abstract
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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

Method used

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  • Solving method for packet loss of IPTV

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Embodiment Construction

[0009] The solution to the IPTV live broadcast packet loss described in the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0010] Such as figure 1 As shown, the video signal is first input into the encoder 101 for encoding, and then the streamed IP code stream is transmitted to the streaming media server 102, and then converted into a multicast stream by the streaming media server 102 and broadcast to the set-top box 103. Both the encoder 101 and the streaming server 102 are connected to the metropolitan area network. Since the current metropolitan area network is generally light in load and the quality of the network line is relatively good, there is usually no packet loss. UDP transmission is fine. However, if the network conditions are not good, TCP transmission must be used. Generally, one-way UDP multicast can be used between the streaming media server 102 and the set-top box 103 . F...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/08H04L29/06H04L12/56
Inventor 田洪亮
Owner ZTE CORP
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