我正在尝试使用 opencv 从我的网络摄像头输出创建一个 avi 视频。没有抛出异常,但是它创建的 avi 文件大小为 414 字节并且不会增长。
它也不会与任何媒体播放器一起播放。我怀疑写入文件部分有问题。
代码如下:
CvCapture *capture = cvCaptureFromCAM( 0 );
int width = ( int )cvGetCaptureProperty( capture,
CV_CAP_PROP_FRAME_WIDTH );
int height = ( int )cvGetCaptureProperty( capture,
CV_CAP_PROP_FRAME_HEIGHT );
CvVideoWriter *writer = cvCreateVideoWriter("CamCapture.avi",
-1,30, cvSize( width, height ) );
cvNamedWindow("capWindow", CV_WINDOW_AUTOSIZE);
IplImage *frame = 0;
// this returns 0 not sure why ??
//double fps = cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);
double fps = 30;
while( 1 )
{
frame = cvQueryFrame( capture );
cvShowImage("capWindow",frame);
cvWriteFrame( writer, frame );
char c = cvWaitKey(1000/fps);
if( c == 27 ) break;
}
cvReleaseCapture( &capture );
cvReleaseVideoWriter( &writer );
cvDestroyWindow( "capWindow" );
我引用并尝试了以下示例,但没有成功:
最佳答案
不要用过时的C,用C++的api,简单易用,比如上面的代码可以用C++改写,
#include "opencv2/opencv.hpp"
#include <iostream>
using namespace std;
using namespace cv;
int main(){
VideoCapture vcap(0);
if(!vcap.isOpened()){
cout << "Error opening video stream or file" << endl;
return -1;
}
int frame_width= vcap.get(CV_CAP_PROP_FRAME_WIDTH);
int frame_height= vcap.get(CV_CAP_PROP_FRAME_HEIGHT);
VideoWriter video("out.avi",CV_FOURCC('M','J','P','G'),10, Size(frame_width,frame_height),true);
for(;;){
Mat frame;
vcap >> frame;
video.write(frame);
imshow( "Frame", frame );
char c = (char)waitKey(33);
if( c == 27 ) break;
}
return 0;
}
关于c++ - opencv 将网络摄像头输出写入 avi 文件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24195926/