A Instantaneous Channel Switching Method for Digital TV Live Streaming
A technology for digital TV and platform switching, which is applied in the fields of electrical components, image communication, selective content distribution, etc., and can solve the problems that users cannot quickly switch channels, etc.
Active Publication Date: 2019-06-28
浙江华数广电网络股份有限公司 +1
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Problems solved by technology
[0003] With the improvement of users' requirements for digital TV viewing experience, the 3-second channel switching time can no longer meet the user's needs for fast channel switching
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[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0019] Such as figure 1 As shown in Fig. 1, a method for instant channel switching of digital TV live broadcast, the multicast stream of the live program is input into the stream switching device, modulated by IPQAM and then transmitted in the cable network. The set-top box terminal only needs to lock the frequency and lock the current channel when it is turned on, and notify the stream switching device to change the target multicast stream address every time it switches channels, and the set-top box terminal only needs to decode the new video stream of the current channel.
[0020] Such as figure 2 As shown, the live signal source converts various stream formats into the same format through a transcoder, preferably all into H.264 format, and performs unified PID setting (normalization) and PMT (program mapping table) description character a...
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The invention discloses an instantaneous channel switching method for digital television live broadcast. The method comprises the following steps: a live broadcast source multicast stream enters a transcoder for transcoding into a unified audio and video format and a PID, a PMT descriptor is added, and the stream is then outputted to a stream switcher; stream switching equipment outputs an IP video stream to IPQAM equipment, the IPQAM equipment modulates the IP video stream to a TS stream to an HFC network, and at the same time, the IPQAM needs to map and download ctrl_pid to a set-top box terminal, and a PMT table is changed; when the set-top box terminal is started up, frequency locking, channel locking and PMT PID search are carried out, and when the channel has no change, the ctrl_pid value is not changed; when the user of the set-top box terminal presses a channel switching button, a video stream of a new channel is switched by the stream switching equipment; and the set-top box terminal decodes frames of the new video stream in the HFC network, and as the stream switching equipment is arranged and frequency locking is carried out when the set-top box terminal is started up, the stream switching equipment is announced to change a target multicast stream address each time when the channel is switched, and the problem of direct channel switching is solved.
Description
technical field [0001] The invention relates to the field of broadcasting and television, in particular to an instantaneous channel switching method for digital television live broadcast. Background technique [0002] At present, every channel switching of digital TV live broadcast channels requires a set-top box to perform data query, tuner frequency locking, player setting, CA decryption, descrambler descrambling, and decoding output. The whole process takes about 3 seconds before channel switching is completed. [0003] With the improvement of users' requirements for digital TV viewing experience, the switching time of 3 seconds cannot meet the needs of users for fast channel switching. More and more users hope to quickly switch channels successfully after pressing the channel switch button, without black screen and static frame phenomenon caused by the frequency locking process. Contents of the invention [0004] Aiming at the above-mentioned technical defects, the pr...
Claims
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IPC IPC(8): H04N21/262H04N21/2668H04N21/2343H04N21/6405H04N21/236H04N21/472
CPCH04N21/234309H04N21/234336H04N21/23617H04N21/26208H04N21/2668H04N21/47202H04N21/6405
Inventor 赵志峰吕明杰张卫吴艳林周明峰杜申利王微波何瑛
Owner 浙江华数广电网络股份有限公司