OpenCV_讀視頻文件、保存視頻文件

 

OpenCV提供了讀視頻的類和函數，同樣也提供了將多張幀圖像或圖片生成一個視頻的類和函數。

詳細的介紹見：

http://opencv.willowgarage.com/wiki/documentation/cpp/highgui/VideoWriter

http://opencv.willowgarage.com/wiki/VideoCodecs

 

 

下面是一段讀視頻、處理視頻幀、寫/保存視頻的簡單示例代碼：

 

 

//  讀視頻文件、保存視頻文件
//  Author：www.icvpr.com
//  Blog：  http://blog.csdn.net/icvpr 

#include <iostream>
#include <string>

#include <opencv2/opencv.hpp>


int main(int argc, char** argv)
{
	std::string strInputName = "input.avi" ;
	std::string strOutputeName = "output.avi" ;


	// Input video
	cv::VideoCapture capture(strInputName) ;
	if( !capture.isOpened() )
	{
		std::cout<< "open video error happened" << std::endl ;
		return -1;
	}


	// Info of output video
	int codec = static_cast<int>(capture.get(CV_CAP_PROP_FOURCC)) ;
	int frameRate = capture.get(CV_CAP_PROP_FPS) ;
	cv::Size frameSize = cv::Size((int)capture.get(CV_CAP_PROP_FRAME_WIDTH),
								  (int)capture.get(CV_CAP_PROP_FRAME_HEIGHT)) ;

	cv::VideoWriter writer ;
	writer.open(strOutputeName, CV_FOURCC('D','I','V','X') , frameRate, frameSize, true) ;
	if ( !writer.isOpened())
	{
		std::cout<< "cannot open the output video file for write" << std::endl ;
		return -1 ;
	}


	// process frame
	cv::Mat frame ;
	while ( capture.read(frame) )
	{		
		// doSomething
                  
		// save frame
		writer.write(frame) ;

		// display 
		cv::imshow("video", frame) ;
		if ( cv::waitKey(frameRate) > 0)  // press any key to exit
		{
			break ;
		}
	}


	return 0 ;
}

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< 轉載請註明：http://blog.csdn.net/icvpr >