Capturing first frame takes up to 1 second

I am running a simple python program using OpenCV on a Raspberry Pi 4. The problem is that when taking the first frame it takes up to 1 second, which seems very strange to me. The forms that I used were the following and in both, I had the same result.

camera = cv2.VideoCapture(0)
_, img = camera.read()

The other option is:

camera = cv2.VideoCapture(0, cv2.CAP_V4L2)
_, img = camera.read()

I am using a USB camera.

source https://stackoverflow.com/questions/70535763/capturing-first-frame-takes-up-to-1-second

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