Previewing and then capturing HD video frames from webcam with Python

captureVid.py

import cv2
import time
from pathlib import Path
import os

cam = cv2.VideoCapture(1)
cam.set(3, 1920)
cam.set(4, 1080)

cv2.namedWindow("test")

img_counter = 0
frame_counter = 0

Path("output").mkdir(parents=True, exist_ok=True)

while True:
    ret, frame = cam.read()
    if not ret:
        print("failed to grab frame")
        break
    cv2.imshow("Choose aperture, ISO etc.", frame)

    k = cv2.waitKey(1)
    if k%256 == 27:
        # ESC pressed
        print("Escape hit, closing...")
        break
    elif k%256 == 32:
        # SPACE pressed
        img_name = "opencv_frame_{}.png".format(img_counter)
        cv2.imwrite(img_name, frame)
        print("{} written!".format(img_name))
        img_counter += 1

cv2.destroyAllWindows()

while True:
    time.sleep(5)
    ret, frame = cam.read() 
    if not ret:
        print("failed to grab frame")
        break
    img_name = os.path.join("output",f'MovieFrame{frame_counter:05}.jpg')
    cv2.imwrite(img_name, frame,[cv2.IMWRITE_JPEG_QUALITY, 80])
    print("{} written!".format(img_name))
    frame_counter += 1

cam.release()

#ffmpeg -framerate 15 -pattern_type glob -i '*.jpg' -c:v libx264 -pix_fmt yuv420p out.mp4