老师您好，我现在在用DM368 EVM的板子做视频编码，板子上有分量输入的接口，并且dvsdk的demo里面有选择分量输入的选项，但是我分量输入的时候demo运行报错：Error: Failed to create capture device. Is video input connected? 请问老师是什么原因，是需要配置什么东西吗？
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