Python、Opencv、Imutils:ValueError:要解压缩的值太多（预期为2个）

我正在尝试向Tkinter窗口提供实时视频。我正在为视频流使用imutils.video。当我试图运行代码时，我遇到了下面提到的错误。 runfile（'C:/Users/Ravi/Face\u Detector/opencv\u tkinter.py'，wdir='C:/Users/Ravi/Face\u Detector'）

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我用frame=cap.read（）试过了，效果很好

制作

cap

global help？@paradoxlover使用global cap，效果不好。我尝试了frame=cap.read（）并成功了。

Traceback (most recent call last):

  File "C:\Users\Ravi\opencv_tkinter.py", line 37, in <module>
show_frame() #Displayq

  File "C:\Users\Ravi\opencv_tkinter.py", line 23, in show_frame
_, frame = cap.read()

ValueError: too many values to unpack (expected 2)

import numpy as np
import cv2
import tkinter as tk
from PIL import Image, ImageTk
from imutils.video import VideoStream
import time

#Set up GUI
window = tk.Tk()  #Makes main window
window.title("Test_1")
window.config(background="#FFFFFF")

#Graphics window
imageFrame = tk.Frame(window, width=600, height=600)
imageFrame.grid(row=2, column=0, padx=2, pady=2)

#Capture video frames

cap = VideoStream(src=0).start()
time.sleep(2.0)

def show_frame():
    _, frame = cap.read()
    frame = cv2.flip(frame, 1)
    frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGBA)
    frame = Image.fromarray(frame)
    frame = ImageTk.PhotoImage(image=frame)
    display.img = frame #Shows frame for display 1
    display.configure(image=frame)
    window.after(10, show_frame) 

myLable1 = tk.Label(imageFrame, text = "Title_1", bg='blue', fg="white", font=("Helvetica", 16))
myLable1.grid(row= 1, column= 0)
display = tk.Label(imageFrame)
display.grid(row=2, column=0, padx=10, pady=2)  #Display 1

show_frame() #Displayq
window.mainloop()  #Starts GUI