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   源码介绍

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实现三个功能：Video2Img：视频转图片序列；Img2Video：序列图片转视频；Img2VideoRect：图片转视频，并指定区域。

#include <iostream>
#include <io.h>
#include <string>
#include <fstream>
#include <stdio.h>
#include <direct.h>
#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/contrib/contrib.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/video/video.hpp>

using namespace std;

vector<string> split(const string& str, const string& delim);
int Video2Img(const std::string videoName, const std::string imgPath, int stepFrameNum);
int Img2Video(const std::string imgPath, const std::string videoName);
int Img2VideoRect(const std::string imgPath, const std::string filePath, const std::string videoName);

int main(int argc, char *argv[])
{
	/*int model = stoi(argv[1]);

	if(model == 0)
	{			
		string videoName = argv[2];
				
		string imgPath = argv[3];
				
		int stepFrameNum = stoi(argv[4]);
		
		Video2Img(videoName, imgPath, stepFrameNum);
	}
	if(model == 1)
	{		
		string imgPath = argv[2];
		string filePath = argv[3];
		string videoName = argv[4];

		Img2Video(imgPath, filePath, videoName);
	}	*/

	string videoName = "E:/Data/VID_20190111.avi";

	string imgPath = "E:/Data/image";

	int stepFrameNum = 1;

	Img2Video(imgPath, videoName);

	system("pause");
	return 0;
}

int Video2Img(const std::string videoName, const std::string imgPath, int stepFrameNum)
{
	cv::VideoCapture video(videoName);
	if (!video.isOpened())
	{
		std::cout << "Read video Failed !" << std::endl;
		return 0;
	}

	double frame_num = video.get(CV_CAP_PROP_FRAME_COUNT);
	std::cout << "total frame number is: " << frame_num << std::endl;

	if (_access(imgPath.c_str(), 0) == -1)
	{
		std::cout << imgPath <<" not existence!" << std::endl;
		std::cout << "Create folder" << imgPath << " !" << std::endl;
		if (_mkdir(imgPath.c_str()) == -1)
		{
			return 0;
		}
	}

	cv::Mat img;
	int index = 0;
	int count = 0;
	int step = stepFrameNum * video.get(CV_CAP_PROP_FPS);
	char buffer[50];
	while (1)
	{
		video >> img;
		if (count > frame_num && img.empty())
		{
			return 0;
		}

		cv::Mat cutImg(img, cv::Range(120,720), cv::Range(90,730));
		cv::transpose(cutImg, cutImg);
		cv::flip(cutImg, cutImg, 1);

		//if (count % step == 0)
		{
			sprintf(buffer, "%05d", index);
			cv::imwrite(imgPath   "/0"   buffer   ".jpg", cutImg);
			std::cout << "*****************" << index   << std::endl;
		}
		std::cout << frame_num << "/" << count   << std::endl;
	}

	video.release();
	return 0;
}

int Img2Video(const std::string imgPath, const std::string videoName)
{
	cv::Directory dir;
	std::vector< std::string > imgs = dir.GetListFiles(imgPath, "*.jpg", true);

	cv::Mat img;
	img = cv::imread(imgs[0]);
	if (img.empty())
	{
		return 0;
	}

	cv::VideoWriter outputVideo(videoName, CV_FOURCC('M', 'J', 'P', 'G'), 30, cv::Size(img.cols, img.rows));

	for (int i = 0; i < imgs.size(); i  )
	{
		img = cv::imread(imgs[i]);
		if (img.empty())
		{
			return 0;
		}
		
		outputVideo << img;
		std::cout << "******" << i << std::endl;
	}
	std::cout << "****** End！ " << std::endl;
	outputVideo.release();
	return 0;
}

int Img2VideoRect(const std::string imgPath, const std::string filePath, const std::string videoName)
{
	cv::Directory dir;
	std::vector< std::string > imgs = dir.GetListFiles(imgPath,"*.jpg",true);

	cv::Mat img;
	img = cv::imread(imgs[0]);
	if (img.empty())
	{
		return 0;
	}

	cv::VideoWriter outputVideo(videoName, CV_FOURCC('M', 'J', 'P', 'G'), 2, cv::Size(img.cols, img.rows));

	for (int i = 0; i < imgs.size(); i  )
	{
		img = cv::imread(imgs[i]);
		if (img.empty())
		{
			return 0;
		}

		string txtPath = filePath   "/"   split(split(imgs[i], "/")[split(imgs[i], "/").size() - 1], ".")[0]   ".txt";
		fstream txt(txtPath);
		std::cout << txtPath << std::endl;

		if (txt.is_open())
		{
			char line[256];
			while (txt.getline(line, 256))
			{			
				string iclass = split(line, " ")[0];
				float center_x = stof(split(line, " ")[1])*img.cols;
				float center_y = stof(split(line, " ")[2])*img.rows;
				float w = stof(split(line, " ")[3])*img.cols;
				float h = stof(split(line, " ")[4])*img.rows;
				float x = center_x - w / 2.0;
				float y = center_y - h / 2.0;

				if (iclass == "0")
					cv::rectangle(img, cv::Point(int(x), int(y)), cv::Point(int(x   w), int(y   h)), cv::Scalar(0, 0, 255), 2);
				if (iclass == "1")
					cv::rectangle(img, cv::Point(int(x), int(y)), cv::Point(int(x   w), int(y   h)), cv::Scalar(0, 255, 0), 2);
				if (iclass == "2")
					cv::rectangle(img, cv::Point(int(x), int(y)), cv::Point(int(x   w), int(y   h)), cv::Scalar(255, 0, 255), 2);
				if (iclass == "3")
					cv::rectangle(img, cv::Point(int(x), int(y)), cv::Point(int(x   w), int(y   h)), cv::Scalar(255, 0, 0), 2);
				if (iclass == "4")
					cv::rectangle(img, cv::Point(int(x), int(y)), cv::Point(int(x   w), int(y   h)), cv::Scalar(100, 0, 50), 2);
			}
		}
		outputVideo << img;
		std::cout << "******" << i<< std::endl;
	}
	std::cout << "****** End！ " << std::endl;
	outputVideo.release();
	return 0;
}


vector<string> split(const string& str, const string& delim) 
{
	vector<string> res;
	if ("" == str) return res;
	//先将要切割的字符串从string类型转换为char*类型
	char * strs = new char[str.length()   1]; //不要忘了
	strcpy(strs, str.c_str());

	char * d = new char[delim.length()   1];
	strcpy(d, delim.c_str());

	char *p = strtok(strs, d);
	while (p) {
		string s = p; //分割得到的字符串转换为string类型
		res.push_back(s); //存入结果数组
		p = strtok(NULL, d);
	}

	return res;
}