Video files in opencv

Question

I want to read video file(.avi or .mov) and detect motion and edges using Opencv.Can u help me with code?I want to create a GUI in which we can select the video file,then we can

Answer 1

This works for me, I'm using AVIfiles. Call video withe filename, in your main-loop get the next frame and shutdown before terminating or changing to another video.

IplImage  *videoframe;
int videoFps;    
CvCapture *videoCapture=NULL;

int video(char *videoFile) {
    int       key;
    /* load the AVI file */
    videoCapture = cvCaptureFromAVI( videoFile );
    /* always check */
    if( !videoCapture )
        return 0;    
    /* get fps, needed to set the delay */
    videoFps = ( int )cvGetCaptureProperty( videoCapture, CV_CAP_PROP_FPS );
    /* display video */
    cvNamedWindow( "video", 0 );
}

void videoNext() {
        if ( ! videoCapture ) return;
        videoframe = cvQueryFrame( videoCapture );
        if( !videoframe ) return;
        cvShowImage( "video", videoframe );
        /* quit if user press 'q' */
        int key = cvWaitKey( 1000 / videoFps );
}

void videoShutdown() {
    /* free memory */
    cvReleaseCapture( &videoCapture );
    cvDestroyWindow( "video" );
    return;
}

Note: Opencv doesn't support audio playback On how to use ffmmpeg with opencv see audio-output-with-video-processing-with-opencv