Record video with Python 3 + OpenCV 3 on OSX

This simple example will demonstrate how to use python + OpenCV 3 to capture frames from the webcam and save them as a video file of mp4 format on your Mac.

import numpy as np
import cv2

cap = cv2.VideoCapture(0) # Capture video from camera

# Get the width and height of frame
width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH) + 0.5)
height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT) + 0.5)

# Define the codec and create VideoWriter object
fourcc = cv2.VideoWriter_fourcc(*'mp4v') # Be sure to use the lower case
out = cv2.VideoWriter('output.mp4', fourcc, 20.0, (width, height))

while(cap.isOpened()):
    ret, frame = cap.read()
    if ret == True:
        frame = cv2.flip(frame,0)

        # write the flipped frame
        out.write(frame)

        cv2.imshow('frame',frame)
        if (cv2.waitKey(1) & 0xFF) == ord('q'): # Hit `q` to exit
            break
    else:
        break

# Release everything if job is finished
out.release()
cap.release()
cv2.destroyAllWindows()

After running the code, you should see a pop-up window displaying the flipped video captured by your webcam. Just hit the key q to terminate the execution.

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Record video with Python 3 + OpenCV 3 on OSX

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