Audio and video synchronizing method in network monitoring system

A technology for audio and video synchronization and network monitoring, which is applied in closed-circuit television systems, components of TV systems, and televisions. Video synchronization algorithm, low complexity effect

Inactive Publication Date: 2014-01-29
ZHEJIANG UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of complex audio and video synchronization and low synchronization accuracy in the existing network monitoring system, the present invention provides an audio and video synchronization method in a network monitoring system that is simple to implement and has high synchronization accuracy

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  • Audio and video synchronizing method in network monitoring system
  • Audio and video synchronizing method in network monitoring system
  • Audio and video synchronizing method in network monitoring system

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] refer to Figure 1 to Figure 5 , a method for synchronizing audio and video in a network monitoring system, said synchronizing method comprising the following steps:

[0028] (1) The video is compressed by the hardware compression built into the TW2835 chip to generate H.264 data, and the audio is compressed by software to generate the G.729 data format; then it is sent to the RTP library for packaging and sending;

[0029] Described RTP header comprises sequence number and time stamp, and in the sending process of data, the sequence number in the RTP data packet of each sending out all increases one by one, and time stamp marks the acquisition moment of audio-video data;

[0030] (2) After removing the IP header and UDP header from the data packet received from the network, first decide to put the RTP packet into the audio or video buffer according to the load...

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Abstract

An audio and video synchronizing method in a network monitoring system includes that (1) videos are compressed through self hardware compression of a chip TW2835 to generate H.264 data, audios are compressed through software compression to generate a G.729 data format, and the H.264 data and the G.729 data are transmitted to an RTP (real time protocol) database to be packaged and transmitted; (2)after IP (internet protocol) packet headers and UDP (user datagram protocol) packet headers of data packets received from the network are removed, an RTP packet is decided to place into an audio or video buffer area according to load type in an RTP packet header, and load data in the RTP packet are inserted into the correct position of the buffer area according to sequence of serial number fields in the RTP packet; proper data packets are pre-stored in the audio or video buffer area after network data are started to be received; after data of audio and video streams are full of a prestorage area, playing is started; the audio stream is used as time dominant in synchronization, and audio and video synchronization is realized by adjusting video targets. The audio and video synchronizing method is simple to implement and high in synchronization accuracy.

Description

technical field [0001] The invention relates to the field of network monitoring, in particular to an audio and video synchronization method of a network monitoring system. Background technique [0002] Along with the improvement of video surveillance technology and the wide application of surveillance in various fields, in many occasions, people begin to pay attention to audio surveillance. Whether it is public security agencies, airports, railways, banks and other key units, more and more high-quality security projects urgently need clear and realistic audio and video synchronization monitoring systems. The field of audio monitoring has become a new bright spot in the security industry. With the addition of audio monitoring, we can bid farewell to the "silent movie" era of pure video monitoring, which is conducive to the overall control of emergencies, accurate assessment and disposal. The application of audio in monitoring has filled a large gap in the field of security a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/04H04N7/18
Inventor 孟利民蒋维周凯司徒涨勇
Owner ZHEJIANG UNIV OF TECH
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