opencv--打开摄像头

#include <opencv2/opencv.hpp>
#include <iostream>

using namespace cv;
using namespace std;

int main(int argc, char** argv)
{
	//VideoCapture capture;
	//capture.open("./bike.avi");
	VideoCapture capture(0);
	//capture.set(CV_CAP_PROP_FRAME_WIDTH , 640);
	//capture.set(CV_CAP_PROP_FRAME_HEIGHT ,480);
	if(!capture.isOpened())
	{
		printf("[%s][%d]could not load video data...\n",__FUNCTION__,__LINE__);
		return -1;
	}

	Mat frame;
	while(capture.read(frame))
	{
		imshow("video-demo",frame);
		char c = waitKey(66);
		if(c == 27)
		{
			break;
		}
	}
	waitKey(0);
	return 0;
}

编译方法见：

https://blog.youkuaiyun.com/StruggleToLife/article/details/98480725

注意事项：

select timeout
VIDIOC_DQBUF: Resource temporarily unavailable

虚拟机自动重启，重新插拔（我这里刚开始重启后不行，后面重新插拔一下就行了）