Python Program to Capture Video from Camera using OpenCV

Python OpenCV – Capture Video from Camera

You can record a video from Camera in Python using OpenCV Library.

In this tutorial, we shall learn how to record or capture a video

Steps to Record Video from Camera

To capture video from Camera using OpenCV cv2 library, follow these steps:

  1. Import cv2 library.
  2. Get Video Capture object for a camera using cv2.VideoCapture(). You can pass the camera index if there are multiple cameras connected to the computer.
  3. Set up a infinite while loop.
  4. In the while loop, read a frame from video capture object using its read() method.
  5. Show the frame in a window with cv2.imshow().
  6. You can setup to break the loop when user clicks in a specific key.
  7. At the end of your video capture, release the camera and destroy all the windows generated by cv2.imshow().

Example – Capture Video using Python OpenCV cv2 library from Webcam

In the following example, we have passed index as 0 to VideoCapture class. This will bring up the primary and only camera connected to this computer, i.e., webcam.

import cv2

# capture frames from a camera with device index=0
cap = cv2.VideoCapture(0)

# loop runs if capturing has been initialized 
while(1): 

	# reads frame from a camera 
	ret, frame = cap.read() 

	# Display the frame
	cv2.imshow('Camera',frame) 
	
	# Wait for 25ms
	if cv2.waitKey(1) & 0xFF == ord('q'):
		break
		
# release the camera from video capture
cap.release() 

# De-allocate any associated memory usage 
cv2.destroyAllWindows() 

I just captured my phone from the webcam.