OpenCV获取视频文件时长

#include "opencv2/opencv.hpp"
using namespace cv;

VideoCapture capture(“d:/test.mp4”);
if (!capture.isOpened())
{
    return;
}

// 时长计算
int iVideoTime = capture.get(CV_CAP_PROP_FRAME_COUNT) / capture.get(CV_CAP_PROP_FPS);