无法打开网络摄像头，GStreamer给出错误消息（openCV）

Question

topLead.getUId.toString()

当我通过默认摄像头（0）时出现错误。如果我尝试视频字符串，例如“ test.mp4”，则不会。我正在使用Linux Mint和 我的cmake就是这样 /

#include <sstream>
#include <string>
#include <iostream>
#include <opencv2/highgui.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/opencv.hpp>
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <opencv2/core/core.hpp>
#include <opencv2/opencv.hpp>
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
//#include <opencv2/cv.hpp>

//#include <opencv\highgui.h>
//#include <opencv\cv.h>



using namespace std;
using namespace cv;

int main(int argc, char* argv[])

    Mat image;
cv::VideoCapture capture(0);      // open the default camera
if(!capture.isOpened())           // check if it succeeded
{
  //...
    cout << "error  error is may ";
} 
    return 0;
}

错误消息

opt/opencv/release$ cmake -D BUILD_TIFF=ON -D WITH_CUDA=OFF -D ENABLE_AVX=OFF -D WITH_OPENGL=OFF -D WITH_OPENCL=OFF -D WITH_IPP=OFF -D WITH_TBB=ON -D BUILD_TBB=ON -D WITH_EIGEN=OFF -D WITH_V4L=OFF -D WITH_VTK=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=OFF -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D OPENCV_EXTRA_MODULES_PATH=/opt/opencv_contrib/modules /opt/opencv/