使用opencv统计视频库的总时长

/*
* =====================================================================================
*
*       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;
}