OpenCV frame capture from AVI

avi, c++, frames, opencv

Solution

Why don't you try this way using OpenCV 2.3? I think it is more direct and efficient, and more clear to your eyes:

VideoCapture _videoSource;

if(!_videoSource.open("test1.avi")) 
{
   exit(1);         // Exit if fail
}
_videoSource.set(CV_CAP_PROP_CONVERT_RGB, 1);

Mat frame;
namedWindow("Image");
int posFrame;

while(1) 
{
  _videoSource >> frame;
  posFrame=_videoSource.get(CV_CAP_PROP_POS_FRAMES);
  imshow("output", frame);
  return 0;
}

Something like this should work.

Problem

I am working on a project with openCV 2.2. I need to do processing on each frame of an AVI file but when I run my code it only grabs the first frame of the file. The CV_CAP_PROP_POS_FRAMES does not seem to be working. Any ideas why not? ``` CvCapture* capture = cvCaptureFromAVI("test1.avi"); IplImage *img = 0; if (!cvGrabFrame(capture)) { printf("Error: Couldn't open the image file.\n"); return 1; } int numFrames = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_COUNT); int posFrame = 1; for(int i =0; i <= numFrames; i++){ cvSetCaptureProperty(capture, CV_CAP_PROP_POS_FRAMES, i); posFrame = cvGetCaptureProperty(capture, CV_CAP_PROP_POS_FRAMES); img = cvGrabFrame(capture); cvNamedWindow("Image:", CV_WINDOW_AUTOSIZE); cvShowImage("Image:", img); printf("%i\n",posFrame); cvWaitKey(0); cvDestroyWindow("Image:"); } ```

Original source