import time
import cv2
#
def get_image(video):
    cap = cv2.VideoCapture(video)
    while True:
        success, img = cap.read()
        if not success:
            break
        else:
            yield img
#
def convert_img(img):
    img[img < 80] = 0
#
def get_color_area(img):
    return img[450:550, 250:251]
#
def count_objects(video, show_enabled=True):
    waiting_for_end_object = False
    count = 0
    for img in get_image(video):
        convert_img(img)
        color = get_color_area(img)
        area_is_black = True if color.all() == 0 else False
        if area_is_black:
            if waiting_for_end_object:
                count += 1
                waiting_for_end_object = False
        else:
            waiting_for_end_object = True
    #=======показывает видео================
        if show_enabled:
            cv2.imshow('img', img)
            cv2.imshow('color', color)
            cv2.waitKey(1)
            time.sleep(0.01)
    cv2.destroyAllWindows()
    #======================================
    return count
#
def main():
    count = count_objects('/home/xam/PycharmProjects/my_project/video_rolls_1.mp4')
    print(count)
#
if __name__ == '__main__':
    main()