在此，我介绍一下如何读取视频，设置起始帧、结束帧及如何获取帧率。

//读取视频
VideoCapture  capture(“1.avi”);
if (!capture.isOpened())
{
	return 0;
}
long totalFrameNumber=capture.get(CV_CAP_PROP_FRAME_COUNT);//获取视频的总帧数
cout << "整个视频共" << totalFrameNumber << "帧" << endl;
//设置开始帧
long frameToStart = 300;
capture.set(CV_CAP_PROP_POS_FRAMES, frameToStart);
cout << "从第" << frameToStart << "帧开始读" << endl;
//设置结束帧  
int frameToStop = 400;
if (frameToStop < frameToStart)
{
	cout << "结束帧小于开始帧，程序错误，即将退出！" << endl;
	return -1;
}
else
{
	cout << "结束帧为：第" << frameToStop << "帧" << endl;
}
//获取帧率  
double rate = capture.get(CV_CAP_PROP_FPS);
cout << "帧率为:" << rate << endl;