import cv2
import imageio

cap = cv2.VideoCapture('stillalive.mov')
cap.set(1 ,62)
length = int(cap.get(cv2.CAP_PROP_FRAME_COUNT)) - 62
print('length=%d' % length)
frames = []
for i in range(1668):
    ret, frame = cap.read()
    frames.append(cv2.cvtColor(frame, cv2.COLOR_BGR2RGB))
    imageio.mimsave("stillalive.gif", frames, fps=60)