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加强版十六章视频读写

article 2025/1/3 9:51:46

VideoCapture capture(0)用来打开系统摄像头

#include<opencv2/opencv.hpp>
#include<iostream>
using namespace std;
using namespace cv;
int main(int argv, char** argc) {
   VideoCapture capture(0);
   if (!capture.isOpened()) {
       printf("0");
   }
   namedWindow("frame", WINDOW_AUTOSIZE);

   Mat frame;
   while (true) {
       bool ret = capture.read(frame);
       if (!ret)break;
       imshow("ret", frame);
       char c = waitKey(50);
       if (c == 27) {
           break;
       }
   }
   waitKey(0);
       destroyAllWindows();
}
读取摄像头

读取视频文件

获取帧数等信息

#include<opencv2/opencv.hpp>
#include<iostream>
using namespace std;
using namespace cv;
int main(int argv, char** argc) {
   //VideoCapture capture(0);
   VideoCapture capture("C:/newword/image/20.avi");
   if (!capture.isOpened()) {
       printf("0");
   }
   namedWindow("frame", WINDOW_AUTOSIZE);
   int fps = capture.get(CAP_PROP_FPS);
   int width = capture.get(CAP_PROP_FRAME_WIDTH);
   int heigh = capture.get(CAP_PROP_FRAME_HEIGHT);
   int num_of_frame = capture.get(CAP_PROP_FRAME_COUNT);
   printf("frame size(f=%d,w=%d,h=%d,m=%d)", fps, width, heigh, num_of_frame);

读取视频文件或摄像头，将读取视频的保存

#include<opencv2/opencv.hpp>
#include<iostream>
using namespace std;
using namespace cv;
int main(int argv, char** argc) {
   VideoCapture capture(0);
   //VideoCapture capture("C:/newword/image/20.avi");
   if (!capture.isOpened()) {
       printf("0");
   }
   namedWindow("frame", WINDOW_AUTOSIZE);
   int fps = capture.get(CAP_PROP_FPS);
   int width = capture.get(CAP_PROP_FRAME_WIDTH);
   int heigh = capture.get(CAP_PROP_FRAME_HEIGHT);
   int num_of_frame = capture.get(CAP_PROP_FRAME_COUNT);
   int type = capture.get(CAP_PROP_FOURCC);
   printf("frame size(f=%d,w=%d,h=%d,m=%d)", fps, width, heigh, num_of_frame);

   Mat frame;
   VideoWriter writer("C:/newword/image/232320.mp4", type, fps, Size(width, heigh), true);
   while (true) {
       bool ret = capture.read(frame);
       if (!ret)break;
       imshow("ret", frame);
       writer.write(frame);
       char c = waitKey(50);
       if (c == 27) {
           break;
       }
   }
   waitKey(0);
       destroyAllWindows();
}