Flickering video in opencv-tkinter integration

Question

I am trying to build a GUI using tkinter in python 3.6.4 64-bit on Windows 8 by integrating opencv components into the program. I can get the video to play, but there is sig

Answer 1

In tkinter in order to display images, the image needs to have a global reference reference that doesn't go out of scope and then gets garbage-collected, perhaps flickering is caused by lack of such reference. See below code that has such reference to the image, and also ditched the if/else with better structuring:

from tkinter import *
from PIL import Image, ImageTk
import cv2
import threading

cap = cv2.VideoCapture(0)

root = Tk()
def videoLoop():
    global root
    global cap
    vidLabel = Label(root, anchor=NW)
    vidLabel.pack(expand=YES, fill=BOTH)
    while True:
        ret, frame = cap.read()
        frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
        frame = Image.fromarray(frame)
        vidLabel.image = ImageTk.PhotoImage(frame)
        vidLabel.configure(image=vidLabel.image)

videoThread = threading.Thread(target=videoLoop, args=())
videoThread.start()
root.mainloop()