Displaying video with OpenCV

l1nuxn3wbie — Tue, 30 Jun 2009 18:11:11 GMT

Hi!
I am trying to play an AVI video using a short program.

// AVI Stream.cpp :
// This program displays an AVI video and performs processing on it
// and thus displays the processed video.
//

#include "stdafx.h"
#include "highgui.h"
#include "cv.h"
#include
#include

using namespace std;

int main(int argc, char** argv)
{
/*IplImage* frame;
int key;

//assert(argc == 2);

CvCapture* capture = cvCaptureFromAVI("music.avi");

if(!capture) return 1;

int framesPerSecond = (int)cvGetCaptureProperty(capture,CV_CAP_PROP_FPS);

cvNamedWindow("Video Example",0);

while(key != 'q'){
frame = cvQueryFrame(capture);

if(!frame) break;

cvShowImage("Video Example",frame);

key = cvWaitKey(1000/framesPerSecond);

}

//frame = cvGrabFrame(capture);
//frame1 = cvRetrieveFrame(capture);
//cvShowImage("Example",frame1);
//while(1)
//{
//frame = cvQueryFrame(capture);
//if(!frame) break;
//cvShowImage("Video Example",frame);
//char c = cvWaitKey(1000);
//if(c == 27) break;
//}

cvReleaseCapture(&capture);
cvDestroyWindow("Video Example");

return 0;*/

cvNamedWindow("Video", CV_WINDOW_AUTOSIZE);
CvCapture* capture = cvCreateFileCapture("music.avi");

IplImage* frame;
while(1)
{
frame = cvQueryFrame(capture);
if(!frame) break;
cvShowImage("Video",frame);
char c = cvWaitKey(10000000);
if(c == 27) break;

}

//frame = cvQueryFrame(capture);
//cout << "This is what is stored in capture: " << capture;
//cvShowImage("Video",capture);

cvReleaseCapture(&capture);
cvDestroyWindow("Video");
//cout << "This is what is stored in capture: " << capture;

}

Unfortunately, a window displays with the name of the window, but no video plays. HELP ME PLEASE!!
I don't know if there is a codec I need or what. The variable that holds my capture structure is 0.

Re: Displaying video with OpenCV

Vladimir_Dudnik — Mon, 06 Jul 2009 16:48:36 GMT

As far as I know, OpenCV uses ffmpeg for video decoding. You may need to ensure that compression format used in your AVI file is supported by ffmpeg.

Vladimir

topic Displaying video with OpenCV in Intel® Integrated Performance Primitives

Displaying video with OpenCV

Re: Displaying video with OpenCV