OpenCV视频读取、显示、保存

提前配置：

OpenCV:​​https://opencv.org/​​

代码：

（1）Iplimage类型

#include <iostream>
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"

using namespace std;
using namespace cv;

int main()
{
  string video_dir = "F:\\1.mp4";
  string saveDir = "./image/";
  CvCapture *capture = NULL;
  IplImage *frame = NULL;
  IplImage* temp = NULL;
  IplImage *dst = NULL;
  capture = cvCreateFileCapture(video_dir.c_str());//最后要cvReleaseCapture(&capture);

  int src_frame_width = (int)cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH);//获取视频的宽
  int src_frame_height = (int)cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT);//获取视频的高
  CvSize size;
  size.width = src_frame_width;
  size.height = src_frame_height;

  temp = cvCreateImage(size, IPL_DEPTH_8U, 1);//创建目标图像
  CvSize dstSize = cvSize(temp->width / 8, temp->height / 8);
  dst = cvCreateImage(dstSize, temp->depth, temp->nChannels);
  char savePath[100];
  int pictureNumbers = 0;
  cvNamedWindow("video");

  while (1)
  {
    frame = cvQueryFrame(capture);
    cvCvtColor(frame, temp, CV_BGR2GRAY);//cvCvtColor(src,des,CV_BGR2GRAY)  
    cvResize(temp, dst, CV_INTER_LINEAR);

    cvShowImage("video", dst);
    sprintf(savePath, "%s/%04d.jpg", saveDir, pictureNumbers);
    cvSaveImage(savePath, dst);
    cvWaitKey(1);
  }
  cvReleaseCapture(&capture);
  cvReleaseImage(&dst);
  cvDestroyAllWindows();
  return 0;
}

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#include <iostream>
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"

using namespace std;
using namespace cv;

int main(int argc, char **argv) 
{
      //视频路径
    string videoPath = "D:\\1.mp4";
      //图像保存路径
    string saveImagePath = "D:/image/1";
    char saveChar[200];
    // 创建了一个名为video的窗口用来显示帧
    cv::namedWindow("video", cv::WINDOW_AUTOSIZE);
    cv::VideoCapture cap;

    // 读取视频文件
    cap.open(videoPath);

    cv::Mat frame;
    int imageCount = 0;
    while (true) 
    {
        // 按帧读取
        cap >> frame;
        if (frame.empty())
            break;
        cv::imshow("video", frame);
        sprintf(saveChar, "%s/%04d.jpg", saveImagePath, imageCount);
        cout << saveChar << endl;
        imwrite(saveChar, frame);
        imageCount++;
        if (cv::waitKey(33) >= 0)
            break;
    }
    destroyAllWindows();
    return 0;
}