使用Raspberry Pi +网络摄像头以python录制视频，但有时相机无法像我预期的那样打开/关闭

Question

I am trying to using Raspberry Pi + webcam (logitech) to record video, but there is a problem at the first step... I would like to male the webcam turned on when needed, and turned off otherwise, however when I try

cap = cv2.VideoCapture(0)
if cap.isOpened() != True:
    cap.open(0)

the webcam still didn't turn on sometimes... so I would like to know if someone knows the solution, I will appreciate you! Thanks!

Answer 1

try releasing it first, before opening it:

cap = cv2.VideoCapture(0)
if cap.isOpened() != True:
    cap.release()
    cap.open(0)