It takes 30 seconds to "imshow" a "VideoCapture" from USB cam. Why?

asked 2019-10-07 11:10:38 -0500

updated 2019-10-07 11:26:29 -0500

berak gravatar image

I just installed Python 3.7.4 and OpenCV-Python (using pip) on a reasonably fast desktop PC (I5, 16GB RAM). Using a UbiSoft WebCam that was meant for a Wii but appears in Device Manager as "USB camera" and works in Skype. Trying tutorial (tabs-spacing is messed up in this window; assume correct as it eventually works):

import numpy as np
import cv2
cap = cv2.VideoCapture(0)
    ret, frame =
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    cv2.imshow('video', gray)
    if cv2.waitKey(1) & 0xFF == ord('q'):

It eventually works but takes about 30 seconds to get the output video displayed.

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Are you Nintendo camera?

supra56 gravatar imagesupra56 ( 2019-10-08 21:39:33 -0500 )edit