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Again, assuming you are using VideoCapture in HighGUI, you can do set the CAP_PROP_POS_FRAMES property before grabbing/reading the frames. That way the next frame to be read will be from that frame onwards.

Using this method you can set the CV_CAP_PROP_POS_FRAMES property to the frame number you want to quickly bypass however many frames you want. For example, in python 3 you would do it as:

import cv2
cap = cv2.VideoCapture('path/to/video/file')
start_frame_number = 50
cap.set(cv2.CAP_PROP_POS_FRAMES, start_frame_number)

# Now when you read the frame, you will be reading the 50th frame
success, frame =