视频编码器作为一个实体，通过不同的控制块映射不同的编码通道，通过消息传递机制与其他实体进行通信协作。
As an independent entity, video coder USES different control blocks for different coding channels, and communicates with other entities through a 'message delivery' mechanism.
xml负载存在于消息正文中，当它遇到编码器时，只会发出此负载信息。
The XML payload lives in the body of a message and is the only thing emitted when it hits the encoder.
xml负载存在于消息正文中，当它遇到编码器时，只会发出此负载信息。
The XML payload lives in the body of a message and is the only thing emitted when it hits the encoder.
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