OPENcv

how to read video file?

import cv2

cap = cv2.VideoCapture(0)
print(cap.isOpened())
while(cap.isOpened()):
    ret, frame = cap.read()
    if ret == True:
        
       gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
       cv2.imshow('frame', gray)

       if cv2.waitKey(1) & 0xFF == ord('q'):
         break
    else:
        break

cap.release()
cv2.destroyAllWindows()

how to read webcam source?

import cv2
cap = cv2.VideoCapture(0)
cap.set(cv2.CAP_PROP_FRAME_WIDTH, 640)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 480)

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

    if not ret:
        break

    cv2.imshow("Webcam Feed", frame)

    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()

how to change video color to black and white?

import cv2

cap = cv2.VideoCapture(0)

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

    if not ret:
        break
    gray_frame = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    cv2.imshow("Grayscale Video", gray_frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()