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Channel switching method and terminal

A channel switching and channel technology, applied in the IPTV field, can solve problems such as the impact on the quality of IPTV service playback pictures, and achieve the effects of eliminating delay, improving quality, and improving service experience quality

Inactive Publication Date: 2011-09-14
南通耀通家纺城投资有限公司
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Problems solved by technology

[0009] Therefore, during the channel switching process of IPTV, due to many delays, such as the above three delays, it has a great impact on the playback picture quality of IPTV services

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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific implementation methods and accompanying drawings.

[0025] Among the various aspects of time delay in the channel switching process of IPTV, the I frame time delay is the main and key time delay.

[0026] MPEG encoding divides pictures (ie frames) into three types: I frame, P frame, and B frame, wherein, I is an intra-coded frame, P is a forward prediction frame, and B is a bidirectional interpolation frame. Simply put, an I frame is a complete picture, and an I frame contains the most comprehensive information in a static picture, which can be independently decoded by a decoder to generate a picture, and its codec is completely determined by itself without relying on other frames; P The frame and B frame record changes relative to the I frame, and the P frame depends on the previous...

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Abstract

The invention provides a channel switching method in an IPTV, in which a terminal is switched behind a target channel. The method comprises the steps that a first multicast RTP packet received is inspected; if the current frame is found not to be an I-frame, a request message for transmitting the I-frame is sent to a media server; the terminal receives a media stream that takes the I-frame as an initial frame and is sent by the media server. In addition, the invention also provides the terminal and the media server. The method caches a GOP sequence sent latest in a live broadcasting video stream on the media server; after the terminal is switched behind the target channel, if a first message received is found not to be the I-frame, the request message for transmitting the I-frame is sent for requesting to transmit the media stream that takes the I-frame as the initial frame; after receiving the media stream that takes the I-frame as the initial frame, the terminal can decode and output, thereby effectively improving the quality of pictures, effectively eliminating the reflection of time delay and improving the service experience quality of users.

Description

technical field [0001] The present invention relates to the technical field of IPTV (Internet Protocol Television, interactive network television), in particular to a technology of channel switching in IPTV. Background technique [0002] IPTV, also known as Internet TV or broadband TV, is based on IP network and uses broadband network to provide users with interactive services. Through streaming media, digitally processed audio and video programs are provided in the form of IP multicast. to the user. [0003] The channel switching time is one of the important indicators of the service quality of the IPTV service, and fast channel switching can significantly improve the user experience of the IPTV service. [0004] In traditional TV technology, all channel content is generally sent to the media receiving device at the same time by frequency division multiplexing, such as the commonly used cable TV (Cable TV), if the media receiving device wants to switch channels, it only ne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/647H04L29/06
Inventor 欧雄兵曾思南胡加伦方新
Owner 南通耀通家纺城投资有限公司
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