Opencv3.4.0实现视频中的帧保存为图片功能

import timeimport cv2if __name__ == '__main__':  # 填写视频的绝对路径  vidcap = cv2.VideoCapture('/home/shushi/video/猎场.mp4')  success, image = vidcap.read()  start_time = time.time()  print(start_time)  while success:    end_time = time.time()    file_name = str(end_time).replace('.', '')    # 每隔三秒截屏    if 3 == int(end_time - start_time):      start_time = end_time      # 保存JGP 的绝对路径      cv2.imwrite('/home/shushi/video/' + file_name + ".jpg", image) # save frame as JPEG file    success, image = vidcap.read()    if cv2.waitKey(10) == 27: # exit if Escape is hit      break

#include <opencv2/highgui/highgui.hpp>#include<opencv2/imgproc/imgproc.hpp>#include <iostream>  int main(int argc, char **argv) {  //打开视频文件  cv::VideoCapture cap("E://New folder//DSC_3543.MOV");  if (!cap.isOpened()) { std::cout << "不能打开视频文件" << std::endl; return -1; }  //从3000ms开始播放视频  //cap.set(CV_CAP_PROP_POS_MSEC, 3000); //获取视频的帧速率  double fps = cap.get(cv::CAP_PROP_FPS); double width = cap.get(cv::CAP_PROP_FRAME_WIDTH); double height = cap.get(cv::CAP_PROP_FRAME_HEIGHT);  //std::cout << fps << std::endl; //std::cout << width << std::endl; //std::cout << height << std::endl;   cv::VideoWriter wrt("C://Users//Administrator//Desktop//1.avi", CV_FOURCC('M', 'J', 'P', 'G'), fps, cv::Size(width, height)); int cout = 0; while (true)  {  cv::Mat frame;  //从视频中读取一个帧  bool bSuccess = cap.read(frame); ++cout; if (!bSuccess)  {   std::cout << "不能从视频文件读取帧" << std::endl;   break;  }  //在MyVideo窗口上显示当前帧 if (cout>=fps*1 && cout<=fps*56)//取视频1-56秒内容 {  std::cout << "正在截取..."<<(int)(((cout-fps)/(fps*(56-1)))*100)<<"%" << std::endl;  wrt << frame; }   if (cout>fps*57) {  std::cout << "ENd!!!" << std::endl;  break; }  } system("pause"); return 0; }