Getting individual frames using CV_CAP_PROP_POS_FRAMES in cvSetCaptureProperty

Question

I am trying to jump to a specific frame by setting the CV_CAP_PROP_POS_FRAMES property and then reading the frame like this:

cvSetCapturePropert         


        

Answer 1

I don't know whether or not this would be precise enough for your purpose, but I've had success getting to a particular point in an MPEG video by grabbing the frame rate, converting the frame number to a time, then advancing to the time. Like so:

cv::VideoCapture sourceVideo("/some/file/name.mpg");
double frameRate = sourceVideo.get(CV_CAP_PROP_FPS);
double frameTime = 1000.0 * frameNumber / frameRate;
sourceVideo.set(CV_CAP_PROP_POS_MSEC, frameTime);