Capturing current frame using OpenCV

Question

I want to capture frame from my camera when the specific event occurs

my code

    import cv2
    cap = cv2.VideoCapture("http://192.168.43.1:8080/video") 
    if int(data) < 45:
        return_value, image = cap.read()
        cv2.imwrite('Images/'+str(count)+'.png', image)
        print("capture")

But its saving older frames when it capture please help i want current frame to be saved

Data is data coming from COM port from ultrasonic distance sensor and if distance is less then 45 I have to capture image — Aniket Thorat
– Aniket Thorat, Commented Sep 8, 2021 at 16:45

patthoyts · Accepted Answer · 2021-09-08 13:11:07Z

2

You need to read the frames as they arrive otherwise they just buffer up. You discard the frames you don't want. The following should demonstrate this:

import cv2
cap = cv2.VideoCapture("http://192.168.43.1:8080/video") 
while True:
    return_value, image = cap.read()
    k = cv2.waitKey(10) & 0xFF
    if int(data) < 45:
        cv2.imwrite('Images/'+str(count)+'.png', image)
        print("capture")
    if k == ord('q'):
        break

answered Sep 8, 2021 at 13:11

patthoyts

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1 Comment

Aniket Thorat Over a year ago

No its not working its capturing older frames

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