DirectShow + TKinter

DirectShow.py

# requires PyGrabber (https://github.com/andreaschiavinato/python_grabber)

from pygrabber.PyGrabber import PyGrabber
from pygrabber import dshow_graph
from tkinter import Tk, Message, ttk



def on_closing(event=0):
    print("stop")
    grabber.stop()
    try:
        root.destroy()
    except Exception as e:
        print(e)


def updateWinsize(event):
    # grabber.update_window(event.width, event.height)
    setPos_centered(event.width, event.height)

def grabbedFrame(*args):
    print(args)


def setPos_centered(width, height):
    img_w, img_h = grabber.graph.filters[dshow_graph.FilterType.video_input].get_current_format()
    scale_w = width / img_w
    scale_h = height / img_h
    scale = min(scale_w, scale_h, 1)
    w = int(img_w * scale)
    h = int(img_h * scale)
    dx = (width - w) / 2
    dy = (height - h) / 2
    grabber.graph.filters[dshow_graph.FilterType.render].set_window_position(int(dx), int(dy), w, h)


grabber = PyGrabber(grabbedFrame)
grabber.set_device(0)

root = Tk()
root.geometry("400x400")
root.grid_columnconfigure(0, weight=1)
root.grid_rowconfigure(1, weight=1)

top = ttk.Frame(root)
top.grid(row=0, column=0)
ttk.Button(top, text="Info", command=lambda: grabber.set_device_properties()).grid(row=0, column=0)
ttk.Button(top, text="Grab", command=lambda: grabber.grab_frame()).grid(row=0, column=1)

bottom = ttk.Frame(root)
bottom.grid(row=1, column=0, sticky='nsew')

id = bottom.winfo_id()
grabber.start_preview(id)

root.protocol("WM_DELETE_WINDOW", on_closing)
bottom.bind("<Configure>", updateWinsize)

if __name__ == '__main__':
    root.mainloop()