1.利用OpenCv读取视频注意：下面的cvCreateFileCapture()和cvCreateImage()函数需要释放！且不要出现在while()循环里面
int main(){string video_dir = "F:\\监控视频\\1.mp4";CvCapture *capture = NULL;IplImage *frame = NULL;IplImage* temp = NULL;IplImage *dst = NULL;capture = cvCreateFileCapture(video_dir.c_str());//最后要cvReleaseCapture(&capture);int src_frame_width = (int)cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH);//获取视频的宽int src_frame_height = (int)cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT);//获取视频的高CvSize size;size.width = src_frame_width; size.height = src_frame_height;temp = cvCreateImage(size, IPL_DEPTH_8U, 1);//创建目标图像CvSize dstSize = cvSize(temp->width / 8, temp->height / 8);dst = cvCreateImage(dstSize, temp->depth, temp->nChannels); while (1){frame = cvQueryFrame(capture);cvCvtColor(frame, temp, CV_BGR2GRAY);//cvCvtColor(src,des,CV_BGR2GRAY) cvResize(temp, dst, CV_INTER_LINEAR);cvNamedWindow("video");cvShowImage("video", dst);cvWaitKey(1);}cvReleaseCapture(&capture);cvReleaseImage(&dst);cvDestroyAllWindows();return 0;}
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