视频码流转换是支持在异质网络环境中进行视频通信的关键技术之一。
Video transcoding is a key technology to support video communications over heterogeneous networks.
在异构网络间进行视频通信时，需要通过媒体网关对视频流进行格式转换、协议处理、资源控制。
When video stream transmitted between different networks, Media Gateway must implement video stream format conversion, protocol process, and resource control.
每两个单元间具有视频交叉链路通信路径，将能够进行系统备份。
A video cross link communication path between both units will enable system redundancy.
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