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就是我有一个节点是识别东西的，识别到就打开视频录制的节点
@hudie ros2你可以使用声明周期节点，这样可以通过相关的服务进行控制节点的启动关闭等声明周期。
具体使用请参考：https://github.com/ros2/demos/blob/humble/lifecycle/README.rst
