Script to test connected webcams

run.sh

#!/usr/bin/env bash

set -e

# Remove annoyingly verbose logging from OpenCV
export OPENCV_LOG_LEVEL=FATAL

python3 ./webcam_test.py

webcam_test.py

import cv2

def get_cameras():
    cameras = []
    for i in range(8):
        capture = cv2.VideoCapture(i)
        if capture.isOpened():
            cameras.append(i)
        capture.release()
    return cameras


def main():
    initial_cameras = set(get_cameras())

    while True:
        print("Insert a camera")

        while not (new_cameras := set(get_cameras()) - initial_cameras):
            cv2.waitKey(100)

        for camera_id in new_cameras:
            camera = cv2.VideoCapture(camera_id)
            ret, frame = camera.read()

            cv2.imshow("frame", frame)

            cv2.waitKey(200)
            success = (input("Is the image clear? [Y/n]") or "y").lower() == "y"
            camera.release()

        cv2.destroyAllWindows()

        print("Success. Disconnect cameras")
        while set(get_cameras()) != initial_cameras:
            cv2.waitKey(100)


if __name__ == "__main__":
    main()