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Bandwidth control of video conferencing systems

Issuing time:2019-11-15 16:14Author:zonda

Bandwidth control of video conferencing systems

The data of the video conference system is digitally processed and transmitted through the network to realize remote video communication. However, since the video data is relatively large after being encoded, in the case of limited bandwidth, the video conference quality is affected by the network bandwidth, and the card is stuck. Or delay, it will seriously affect the quality of video conferencing.


Video conference screen


In general, in the debugging of the video conference system, the engineers will set the bandwidth to reduce the bandwidth occupied by the video conference system, and ensure that the video conference can effectively cope with the poor network environment. The bandwidth of video conferencing is mainly divided into terminal bandwidth and MCU server bandwidth. The processing methods are as follows:


Terminal bandwidth control:


The control core of the terminal bandwidth is controlled by the chairman of the video conferencing system, and the chairman control function reduces the data forwarding and saves the terminal bandwidth. The terminal mainly accepts audio and video data forwarded by the MCU server, and the received data may be one-to-one or one-to-many, mainly depending on how many parties participate in the conference. General engineers save bandwidth by reducing the amount of data being forwarded. For example, in a multi-party participation scenario, the participants mainly watch the main venue (speaker), and through the control of the rostrum, the conference terminal mainly receives the audio, video and data of the speaker, and switches in real time to ensure the most important audio and video. Information transmission, effectively reducing and controlling unnecessary information, thereby reducing the amount of data received by the terminal to save bandwidth.


MCU server bandwidth control:


In the operation of reducing the bandwidth control of the terminal, the bandwidth of the MCU server is also indirectly reduced, which is related to the function of the MCU (mainly responsible for the distribution and processing of the terminal data), and the bandwidth control of the MCU server is related to its architecture, and is distributed. In the architecture, bandwidth is controlled by reducing data forwarding between servers.


In a specific scenario, the video conferencing system has many points to be connected. The distributed architecture requires some data forwarding between the MCU and the MCU in the data transmission. Since the MCU and the MCU data are also forwarded, a large amount of bandwidth is required for data transmission. Therefore, in the distributed MCU architecture, engineers generally set up a terminal connection scheme internally to minimize the amount of transmission between MCU servers and thus control bandwidth.


Bandwidth control is a key step in the debugging of video conferencing systems, which is related to the quality of video conferencing. At present, in addition to building a higher bandwidth, a certain bandwidth transmission optimization can be performed on the terminal and the MCU server, thereby reducing unnecessary data transmission and controlling the video conference bandwidth.


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