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最近实验室需要做个Demo，要把两个视频拼到一个窗口里面进行播放。于是写了个使用ROI来实现两个视频拼接到一起的代码，但是该代码的前提是两个视频的帧数、宽高都一样。

#include "stdafx.h"
#include <cv.h>   
#include <cvaux.h>   
#include <highgui.h>   #pragma comment(lib, "ml.lib")   
#pragma comment(lib, "cv.lib")   
#pragma comment(lib, "cvaux.lib")   
#pragma comment(lib, "cvcam.lib")   
#pragma comment(lib, "cxcore.lib")   
#pragma comment(lib, "cxts.lib")   
#pragma comment(lib, "highgui.lib")   
#pragma comment(lib, "cvhaartraining.lib") int _tmain(int argc, _TCHAR* argv[])
{IplImage *newFrame=NULL;IplImage *frame1=NULL;IplImage *frame2=NULL;CvCapture * pCapture1 = cvCaptureFromAVI(argv[1]);CvCapture * pCapture2 = cvCaptureFromAVI(argv[2]);CvRect rect;CvVideoWriter *pWriter=NULL;//get the frame number of two videosint frameNo1 = (int) cvGetCaptureProperty(pCapture1, CV_CAP_PROP_FRAME_COUNT);int frameNo2 = (int) cvGetCaptureProperty(pCapture2, CV_CAP_PROP_FRAME_COUNT);if(frameNo1!=frameNo2)printf("video length 1 != video length 2\n");elseprintf("Total frame numbers: %d\n",frameNo1);//get the frame width of two videosint frameWidth1 = (int) cvGetCaptureProperty(pCapture1, CV_CAP_PROP_FRAME_WIDTH);int frameWidth2 = (int) cvGetCaptureProperty(pCapture2, CV_CAP_PROP_FRAME_WIDTH);if(frameWidth1!=frameWidth2)printf("video width 1 != video width 2\n");elseprintf("frame width: %d\n",frameWidth1);//get the frame height of two videosint frameHeight1 = (int) cvGetCaptureProperty(pCapture1, CV_CAP_PROP_FRAME_HEIGHT );int frameHeight2 = (int) cvGetCaptureProperty(pCapture2, CV_CAP_PROP_FRAME_HEIGHT );if(frameHeight1!=frameHeight2)printf("video height 1 != video height 2\n");elseprintf("frame height: %d\n",frameHeight1);//get the video fpsint fps1 = (int) cvGetCaptureProperty(pCapture1, CV_CAP_PROP_FPS  );int fps2 = (int) cvGetCaptureProperty(pCapture2, CV_CAP_PROP_FPS  );if(fps1!=fps2)printf("video fps 1 != video fps 2\n");elseprintf("frame fps: %d\n",fps1);int initFlag=0;int counter=0;while((frame1=cvQueryFrame(pCapture1))!=NULL && (frame2=cvQueryFrame(pCapture2))!=NULL ){printf("%d\n",counter++);if(initFlag==0){newFrame = cvCreateImage(cvSize(frame1->width*2,frame1->height),frame1->depth,frame1->nChannels);pWriter = cvCreateVideoWriter("re.avi",CV_FOURCC('X','V','I','D'),fps1,cvSize(frame1->width*2,frame1->height),1);initFlag=1;}rect.x=0;rect.y=0;rect.height=frameHeight1;rect.width=frameWidth1;//use ROI to implement the video split jointcvSetImageROI(newFrame, rect);cvCopyImage(frame1, newFrame);cvResetImageROI(newFrame);rect.x = frameWidth1;rect.y=0;rect.height = frameHeight1;rect.width = frameWidth1;cvSetImageROI(newFrame, rect);cvCopyImage(frame2, newFrame);cvResetImageROI(newFrame);cvWriteFrame(pWriter, newFrame);}cvReleaseImage(&frame1);cvReleaseImage(&frame2);cvReleaseImage(&newFrame);cvReleaseVideoWriter(&pWriter)return 0;}