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Wireless narrowband network video transmission method

A narrowband network and video transmission technology, applied in the field of wireless narrowband network video transmission, can solve the problems of video image frame interval time difference, poor video image viewing continuity, no video image or blurry screen, etc., to achieve uniform and coherent video images, smooth jitter Phenomena, Effects of Minimal Latency

Inactive Publication Date: 2009-09-09
ZHEJIANG DAHUA TECH CO LTD
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Problems solved by technology

[0003] In order to solve the technical problems of larger cumulative delay in the transmission of MPEG4 video images through CDMA wireless networks, serious differences in video image frame interval time, poor video image viewing continuity, and even long-term no video images or blurred screens, the present invention Provide a wireless narrowband network video transmission method, the invention can effectively shorten the cumulative delay of the CDMA wireless network, basically keep the same as the inherent delay of the CDMA wireless network itself, and the video image frame interval time is uniform, and the data in the frame is complete

Method used

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Embodiment Construction

[0019] The wireless narrowband network video transmission method of the present invention is composed of three parts: stream analysis control, network detection state control and network transmission. Among them, the code flow analysis control mainly analyzes the encoded data, separates the I frame and P frame, and stops or starts the encoder encoding; the network detection status control is mainly responsible for the management of the network sending buffer, judging the network status, and controlling the written data; Network sending is mainly responsible for sending the data in the buffer to the network, and implementing part of the frame dropping strategy.

[0020] The video stream data of MPEG4 is composed of I frame and P frame. I frame is the complete image data, and P frame is the frame data after calculation with the previous frame. The data size of I frame is generally more than 10 times that of P frame. I-frame transmission occupies most of the network bandwidth. Th...

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Abstract

The invention discloses a wireless narrowband network video transmission method. The method comprises code stream analytical control, network detection state control and network transmission. The method utilizes the data separation of I frame and P frame, according to the characteristic property of MPEG4 video format, optimizes the transmission of video stream in a CDMA wireless network through data stream management, buffer management and reasonable frame-dropping strategy, so as to achieve the dithering phenomenon of smooth network, ensure least time delay of transmission and obtain uniform and continuous previewed video images.

Description

technical field [0001] The invention relates to a network video transmission method, in particular to a wireless narrowband network video transmission method for transmitting MPEG4 video data in a CDMA wireless network communication environment. Background technique [0002] At present, in some special industries in the field of security monitoring, it needs to be applied to transmit video stream data using CDMA network, and users need to preview remote video images locally in real time. CDMA wireless network has the characteristics of low network transmission bandwidth, large transmission rate jitter, long network delay, and high packet loss rate. It is mainly used for simple and small amount of data transmission, while MPEG4 video image data is large, and has The specific frame format requires that the front and back data are related to each other. Ordinary video network transmission methods are based on wired networks or wireless LANs with stable bandwidth and low networ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/24H04N7/26H04L1/00H04N19/159
Inventor 殷俊傅利泉张兴明
Owner ZHEJIANG DAHUA TECH CO LTD
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