使用opencv统计视频库的总时长

统计视频库里的视频文件的总时长

废话不多说，直接上代码：

/*
 * =====================================================================================
 *
 *       Filename:  count_the_vedeo_time.cpp
 *      Environment:    
 *    Description:  用于计算视频文件列表里的视频文件各个时长及其总和，用于统计视频数据库的时长
 *
 *
 *        Version:  1.0
 *        Created:  2013/10/21 8:50:09
 *         Author:  yuliyang
I*
 *             Mail:  wzyuliyang911@gmail.com
 *             Blog:  http://www.cnblogs.com/yuliyang
 *
 * =====================================================================================
 */

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <iostream>
#include "fstream"


using namespace std;
using namespace cv;

int main(int args,char* argv[])
{
    string buf;    
    ifstream svm_data(argv[1]);                 /*读入视频文件列表  */
    ofstream result(argv[2]);                   /* 保存结果文件 */
    double sum=0;
    while (svm_data)
    {
        if (getline(svm_data,buf))
        {
            result<<"计算视频"<<buf.c_str()<<"的时长"<<endl;
            //打开视频文件：其实就是建立一个VideoCapture结构
            VideoCapture capture(buf.c_str());
            //检测是否正常打开:成功打开时，isOpened返回ture
            if(!capture.isOpened())
                result<<"fail to open!"<<endl;
            //获取整个帧数
            double totalFrameNumber = capture.get(CV_CAP_PROP_FRAME_COUNT);
            //获取帧率
            double rate = capture.get(CV_CAP_PROP_FPS);
            
            double vedio_time= totalFrameNumber/rate;
            result<<"该个视频共"<<totalFrameNumber<<"帧,"<<"帧率为:"<<rate<<"该视频时长为："<<vedio_time<<" s"<<endl;
            capture.release();
            sum +=vedio_time;
            
        }
    }

    result<<"视频时长总和为："<<sum/60<<"mins"<<endl;
    result.close();
    return 0;
}