Capture Video from Camera ¶

import cv2
import time
import shutil


cap = cv2.VideoCapture(0)
snapshot = "/tmp/snapshot.jpg"
snapshot_tmp = "/tmp/snapshot.tmp.jpg"

print('Press "q" to quit ...')

while(True):

    # Capture frame-by-frame
    ret, frame = cap.read()

    # Our operations on the frame come here
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

    # Display the resulting frame
    #cv2.imshow('frame',gray)
    cv2.imshow('frame', frame)

    # Update snapshot
    cv2.imwrite(snapshot_tmp, frame)
    shutil.move(snapshot_tmp, snapshot)
    print('%s "%s" updated' % (
        time.asctime(),
        snapshot
    ))

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

    time.sleep(0.1)

# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()

References:

• https://docs.opencv.org/3.0-beta/doc/py_tutorials/py_gui/py_video_display/py_video_display.html