video_out.py

import sys
import cv2


cap = cv2.VideoCapture(0)

if not cap.isOpened():
    print("Camera open failed!")
    sys.exit()

w = round(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
h = round(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
fps = cap.get(cv2.CAP_PROP_FPS)

fourcc = cv2.VideoWriter_fourcc(*'DIVX') # *'DIVX' == 'D', 'I', 'V', 'X'
delay = round(1000 / fps)

out = cv2.VideoWriter('output3.avi', fourcc, fps, (w, h))

if not out.isOpened():
    print('File open failed!')
    cap.release()
    sys.exit()

while True:
    ret, frame = cap.read()

    if not ret:
        break

    # inversed = ~frame
    out.write(frame)
    # out.write(inversed)

    cv2.imshow('frame', frame)
    # cv2.imshow('inversed', inversed)

    if cv2.waitKey(delay) == 27:
        break

cap.release()
out.release()
cv2.destroyAllWindows()