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• l1nuxn3wbie June 30, 2009 12:11 PM PDT    Displaying video with OpenCV 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 <iostream> #include <stdio.h> 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. Vladimir Dudnik (Intel) July 6, 2009 10:48 AM PDT Rate   #1 Re: Displaying video with OpenCV 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

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