Opencv保存視頻的方法.doc

Opencv保存avi等視頻的方法主要是cvWriteFrame時(shí)容易出現(xiàn)問(wèn)題，解決方法：（1）下載xvid解碼器 /Downloads.43.0.html（2）OpenCV一定要2.2以上的（我用2.2成功）下面是測(cè)試源碼（需要裝有攝像頭）#include cv.h #include cxcore.h #include highgui.h #include using namespace std; int main() CvCapture* capture=cvCaptureFromCAM(-1); CvVideoWriter* video=NULL; IplImage* frame=NULL; int n; if(!capture) /如果不能打開(kāi)攝像頭給出警告 coutCan not open the camera.width,frame-height); /創(chuàng)建CvVideoWriter對(duì)象并分配空間 /保存的文件名為camera.avi，編碼要在運(yùn)行程序時(shí)選擇，大小就是攝像頭視頻的大小，幀頻率是 if(video) /如果能創(chuàng)建CvVideoWriter對(duì)象則表明成功 coutVideoWriter has created.endl; cvNamedWindow(Camera Video,1); /新建一個(gè)窗口 int i = 0; while(i = 200) / 讓它循環(huán)次自動(dòng)停止錄取 frame=cvQueryFrame(capture); /從CvCapture中獲得一幀 if(!frame) coutCan not get frame from the capture.endl; break; n=cvWriteFrame(video,frame); /判斷是否寫(xiě)入成功，如果返回的是，表示寫(xiě)入成功 coutn0) break; /有其他鍵盤響應(yīng)，則退出 cvReleaseVideoWriter(&video); cvReleaseCapture(&capture); cvDestroyWindow(Camera Video); return 0; 網(wǎng)上還有個(gè)例子初始化: CvVideoWriter *writer = 0; int isColor = 1; int fps = 25; / or 30 int frameW = 640; / 744 for firewire cameras int frameH = 480; / 480 for firewire cameras writer=cvCreateVideoWriter(out.avi,CV_FOURCC(P,I,M,1), fps,cvSize(frameW,frameH),isColor); 其他代碼對(duì)應(yīng)的編碼器: CV_FOURCC(P,I,M,1) = MPEG-1 codec CV_FOURCC(M,J,P,G) = motion-jpeg codec (does not work well) CV_FOURCC(M, P, 4, 2) = MPEG-4.2 codec CV_FOURCC(D, I, V, 3) = MPEG-4.3 codec CV_FOURCC(D, I, V, X) = MPEG-4 codec CV_FOURCC(U, 2, 6, 3) = H263 codec CV_FOURCC(I, 2, 6, 3) = H263I codec CV_FOURCC(F, L, V, 1) = FLV1 codec 將上面的改成 -1 將會(huì)打開(kāi)一個(gè)編碼器的選擇窗口. 將每幀圖像寫(xiě)入視頻文件中: IplImage* img = 0; int nFrames = 50; for(i=0;inFrames;i+) cvGrabFrame(capture); / capture a frame img=cvRetrieveFrame(capture); / retrieve the captured frame cvWriteFrame(writer,img); / add the frame to the file 在循環(huán)里面加上下面語(yǔ)句將實(shí)時(shí)將視頻顯示在窗口mainwin中，cvWaitKey設(shè)置的是延遲時(shí)間: cvShowImage(mainWin, img