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Method for synchronizing audio/video data in real-time video monitoring system

A monitoring system, real-time video technology, applied in closed-circuit television systems, electrical components, selective content distribution, etc., can solve the problem that the audience cannot receive, and achieve the effect of reducing the complexity of the algorithm

Inactive Publication Date: 2013-01-09
HANGZHOU DIANZI UNIV
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AI Technical Summary

Problems solved by technology

But if it is high-definition video or ultra-high-definition video, the deviation between audio data and video data must be within 80ms, otherwise the audience cannot receive it

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  • Method for synchronizing audio/video data in real-time video monitoring system
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  • Method for synchronizing audio/video data in real-time video monitoring system

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with accompanying drawing.

[0028] The specific embodiments of the present invention are only used to explain the present invention, and are not intended to limit the present invention.

[0029] In the present invention, the monitoring terminal collects 20 ms audio data and one frame of video data each time, and simultaneously records the system time v_stime at the time of video data collection, and records the system time a_stime at the time of first byte collection of audio data. Use the function gettimeofday() provided by the C library to obtain the collection time and save it in struct timeval tv. According to the research results of foreign institutions, when the deviation between audio data and video data is between -80ms and 80ms, people think that audio and video are synchronized. Therefore, we only need data with millisecond-level precision, and the data obtained by gettimeofday() reaches mi...

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Abstract

The invention discloses a method for synchronizing audio / video data in a real-time video monitoring system. The method comprises the following steps of: acquiring acquisition time of audio data and video data by a monitoring end, encoding the audio data and the video data, and packaging the acquisition time of the audio data and the video data in respective data packets to be sent out; and acquiring the data packets and analyzing and decompressing the data packets by a client, and decoding and playing the data packet of the audio data and the data packet of the video data according to a synchronization mechanism. According to the invention, after the client acquires data transmitted by the monitoring end, the data packet of the video data and the data packet of the audio data are respectively put in a video cache queue and an audio cache queue according to a time sequence, and the data are decompressed and played according to a synchronization precision requirement. The method disclosed by the invention has the advantages of greatly reducing the algorithm complexity of audio / video synchronization without reducing performances to much and completely meeting requirements for video monitoring.

Description

technical field [0001] The invention belongs to the technical field of video monitoring, in particular to a method for synchronizing audio and video data in a real-time video monitoring system. Background technique [0002] With the continuous development and improvement of computer technology, network technology, voice and video codec technology and streaming media technology, video surveillance business has achieved vigorous development in today's network era. Today, the importance of video surveillance services is self-evident, and its application fields include urban security, inspection and quarantine, environmental protection, weather detection, bank security, shop monitoring, etc., and even penetrates into the home field. In the video monitoring system, some application places hope to add audio in the real-time video monitoring system, and the problem of synchronizing audio data and video data will follow. [0003] In a video surveillance system, audio data and video...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/8547H04N7/18
Inventor 章坚武徐强吴超
Owner HANGZHOU DIANZI UNIV
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