Opencv C ++ Raspberry Pi崩溃

Question

我已经坚持这个问题几天了，我以为我会求助。 我写了这个测试代码来显示我的问题

这是我的拍照功能

cv::Mat takePicture(){
    cv::Mat pic;
    VideoCapture cam(0);
    if(!cam.isOpened()){
        std::cout << "Failed to make connection to Cam" << std::endl;
        exit(1);
    }
    cam.set(CV_CAP_PROP_FRAME_WIDTH, 320);
    cam.set(CV_CAP_PROP_FRAME_HEIGHT, 240);
    cam >> pic;
    cvWaitKey(100);
    return pic.clone();
}

这是我的main函数中的一个循环，会导致崩溃

if(test_mode == true){
    while(true){
        Mat testImg;
        char fileName[50];
        sprintf(fileName, "testFile%d", threadNo);
        testImg = takePicture();
        cout << "current pic is " << threadNo << endl;
        threadNo++;
        testImg.release();
    }
} 

程序运行正常，直到图像27它会变慢，而图像30我会得到各种各样的错误

mmap: Cannot allocate memory
munmap: Invalid argument
Unable to stop the stream.: Bad file descriptor
libv4l1: error allocating v4l1 buffers: Cannot allocate memory
HIGHGUI ERROR: V4L: Mapping Memmory from video source error: Invalid argument
HIGHGUI ERROR: V4L: Initial Capture Error: Unable to load initial memory buffers
*** glibc detected *** ./Cam: free(): invalid pointer: 0x0076ab88 *** 
Aborted

我一直认为这必须是由泄漏造成的。在此先感谢您的帮助。