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给usb 摄像头创建udev规则添加symlink后，使用symlink名字出现 inapproriate ioctl for device 错误

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xiaoqiang 最后由 xiaoqiang 编辑

可能是udev规则设置错了，需要在SUBSYSTEM=="video4linux"层链接，在上面一层相当于没有加载v4L驱动,会引发上面的错误
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