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That happened to me in a previous Python version with some videos, my partial solution was reading video with

i=1 
while(i< NUMBER_FRAMES)
     ret, frame = cap.read()
     i=i+1

if you realize, this code read frames to discard them. According the size of your video, NUMBER_FRAMES could vary between 10 and 400, you can set your own number. Hope this hint works for you.