读视频时，帧率的设置

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;