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OpenCV program to capture 30 frames from a video
source link: https://gist.github.com/rakesh-gopal/f960721b105aaaee18fb
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OpenCV program to capture 30 frames from a video · GitHub
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OpenCV program to capture 30 frames from a video
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Full program to save frames in a video
You can use cvQueryFrame to get frames from the video, like this:
CvCapture *capture = cvCaptureFromAVI(argv[1]);
frame = cvQueryFrame(capture);
Also get the frames_per_second using:
int fps = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);
Once you know the FPS, you can calculate the number of frames in 30 seconds:
int num_frames = NUM_SECONDS * fps;
Now repeatedly call cvQueryFrame in a loop, num_frames times, to get all the frames in 30 seconds. Then save each of the frame in the same loop:
cvSaveImage(filename, frame);
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