用OpenCV将视频分解成单帧图片,图片合成视频示例

#include <iostream>
#include "cv.h"
#include "opencv2/opencv.hpp"
 
using namespace std;
using namespace cv;
 
// 描述：将视频帧转成图片输出
void main()
{
	// 获取视频文件
	VideoCapture cap("J:\\CQH\\DLFR\\lab_face\\video\\DSC_0023.MOV");
 
	// 获取视频总帧数
	long totalFrameNumber = cap.get(CV_CAP_PROP_FRAME_COUNT);
	cout << "total frames: " << totalFrameNumber << endl;
 
	Mat frame;
	bool flags = true;
	long currentFrame = 0;
 
	while (flags){
		// 读取视频每一帧
		cap.read(frame);
 
		stringstream str;
		str << "cqh" << currentFrame << ".jpg";
		cout << "正在处理第" << currentFrame << "帧" << endl;
		printf("\n");
 
		// 设置每30帧获取一次帧
		if (currentFrame % 30 == 0){
			// 将帧转成图片输出
			imwrite("J:\\CQH\\DLFR\\lab_face\\videoToImages\\DSC_0023\\" + str.str(), frame);
		}
		// 结束条件
		if (currentFrame >= totalFrameNumber){
			flags = false;
		}
		currentFrame++;
	}
	
	system("pause");
}

#include<opencv2/opencv.hpp>
 
using namespace cv;
 
void main()
{
  //批量读取图片（有序）
  char filename[50];
  char winName[50];
  Mat srcImg;
  for (int i = 1; i < 100; i++)
  {
    sprintf(filename,"%d.bmp",i);
    sprintf(winName,"NO--%d",i);
    srcImg=imread(filename);
    if (srcImg.empty())
      break;
    imshow(winName,srcImg);
  }
  waitKey(0);
  destroyAllWindows();
}

#include<opencv2/opencv.hpp>
 
using namespace cv;
 
void main()
{
  Mat frame;
  char outfile[50];
  VideoCapture cap("E:\\2.avi");
  if (!cap.isOpened())//打开失败
    return;
  int totalFrame=cap.get(CV_CAP_PROP_FRAME_COUNT);//获取视频总帧数
  for (int i = 1; i <=totalFrame; i++)
  {
    cap>>frame;
    if (frame.empty())
      break;
    sprintf(outfile,"E:\\pic\\%d.bmp",i);
    imwrite(outfile,frame);
    imshow("video",frame);
    waitKey(15);
  }
  cap.release();
  destroyAllWindows();
}

#include<opencv2/opencv.hpp>
#include<iostream>
using namespace cv;
using namespace std;
 
void main()
{
  VideoWriter writer("E:\\out.avi",CV_FOURCC('X','V','I','D'),20,Size(320,240),true);//Size要和图片尺寸保持一致
  char filename[50];
  Mat frame;
  for (int i = 1; i < 644; i++)
  {
    sprintf(filename,"E:\\pic\\%d.bmp",i);
    frame=imread(filename);
    if(frame.empty())  break;
    writer<<frame;
  }
  cout<<"write end!"<<endl;
  destroyAllWindows();
}