我现在是使用 OpenCV 的初学者。我正在尝试使用 OpenCV 库从网络摄像头(眼睛玩具网络摄像头)流式传输视频。我知道网络摄像头工作正常,因为我使用 VLC 流式传输视频并且工作正常。我有以下程序:
int main(){
VideoCapture cap(0); // open the video camera no. 0
if (!cap.isOpened()) // if not success, exit program
{
cout << "Cannot open the video file" << endl;
return -1;
}
double dWidth = cap.get(CV_CAP_PROP_FRAME_WIDTH); //get the width of frames of the video
double dHeight = cap.get(CV_CAP_PROP_FRAME_HEIGHT); //get the height of frames of the video
cout << "Frame size : " << dWidth << " x " << dHeight << endl;
namedWindow("MyVideo",CV_WINDOW_AUTOSIZE); //create a window called "MyVideo"
while (1)
{
Mat frame;
bool bSuccess = cap.read(frame); // read a new frame from video
if (!bSuccess) //if not success, break loop
{
cout << "Cannot read a frame from video file" << endl;
break;
}
imshow("MyVideo", frame); //show the frame in "MyVideo" window
if (waitKey(30) == 27) //wait for 'esc' key press for 30ms. If 'esc' key is pressed, break loop
{
cout << "esc key is pressed by user" << endl;
break;
}
}
return 0;
}
当我运行它时,我得到以下输出:
HIGHGUI ERROR: V4L/V4L2: VIDIOC_CROPCAP
Frame size: 640x480
select timeout
我确信在使用 VideoCapture 连接设备时会引发错误。我在网上搜索了很多,但找不到这个特定错误的解释。
任何帮助将不胜感激。