Use opencv combined with ffmpeg to cut video automatically

1

I want to cut the video automatically, by comparing the video frame with the picture, when scrolling through the video frames until the video frame is 90% similar to the picture, then cut at that time, I combine opencv and ffmpeg, I have the code below and when it comes to comparing the video frame with the image, it gives an error. Please help me edit and add it so that the program works.
Thank you

`import cv2
import subprocess as sp
import numpy as np
import  imutils
from skimage.metrics import structural_similarity as compare_ssim

img1 = cv2.imread("F:\\d.png")
img1 = cv2.resize(img1, (480,700))
gray1 = cv2.cvtColor(img1, cv2.COLOR_BGR2GRAY)
########################################################
ffmpeg = "ffmpeg"
input_file='f:\\tt.mp4'
height, width = 480, 700
command = [ffmpeg,
            '-i', input_file,
            '-pix_fmt', 'bgr24',
            '-codec', 'rawvideo',
            '-an',
            '-sn',
            '-f', 'image2pipe', '-']

#pipe = sp.Popen(command, stdout = sp.PIPE, bufsize=65536)
pipe = sp.Popen(command, stdout = sp.PIPE)
frameCount=0
while True:
    nbytes =height*width
    #print(f"Frame: {frameCount} - Trying to read {nbytes} bytes")
    print(f"Frame: {frameCount} ")
    #print(f" {frameCount} ")
    frame =  pipe.stdout.read(nbytes)
    bytesRead = len(frame)
    #print(f"Read {bytesRead} bytes")
    if bytesRead==0:
        break

    image =  np.frombuffer(frame, dtype='uint8')        # convert read bytes to np
    img = image.reshape((480,700))
##########################################################
    (similar, diff) = compare_ssim(frame , gray1, full=True)
    diff = (diff * 255).astype("uint8")


    
########################################################
    cv2.imshow('Video', img)

    if cv2.waitKey(100) & 0xFF == ord('q'):
        break
    frameCount += 1
``
3 
* 3 # bgr24 !

compare_ssim

both args must be numpy arrays of same size/type/format

also, this is very expensive.
maybe add a cheaper test before that like

sum(absdiff(a,b)) > some_threshold