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Screen recording enables you to create demonstration videos, record gaming achievements, and create videos that can be shared online on social media. Many industrial software exists out there that can help you do that very easily though. In this tutorial, you will learn how to make your own simple screen recorder in Python that you can further extend to your own needs.
Let's get started, first, install the required dependencies for this tutorial:
pip3 install numpy opencv-python pyautogui
The process of this tutorial is as follows:
Importing necessary modules:
import cv2 import numpy as np import pyautogui
Let's initialize the format we gonna use to write our video file ( named "output.avi" ):
# display screen resolution, get it using pyautogui itself SCREEN_SIZE = tuple(pyautogui.size()) # define the codec fourcc = cv2.VideoWriter_fourcc(*"XVID") # frames per second fps = 12.0 # create the video write object out = cv2.VideoWriter("output.avi", fourcc, fps, (SCREEN_SIZE)) # the time you want to record in seconds record_seconds = 10
We're getting the screen resolution from the
pyautogui.size() function which returns the height and the width of the screen as a two-integer tuple.
fourcc is the video codec library that OpenCV will use to write the video file, we specified XVID here. We also set the FPS to
12.0 and pass these parameters to the
record_seconds is the number of seconds you want to record, if you want to record until pressing the "q" button, then simply set this to a large value.
Now we need to keep capturing screenshots and writing to the file in a loop until the seconds are passed or the user clicks the "q" button, here is the main loop for that:
for i in range(int(record_seconds * fps)): # make a screenshot img = pyautogui.screenshot() # convert these pixels to a proper numpy array to work with OpenCV frame = np.array(img) # convert colors from BGR to RGB frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB) # write the frame out.write(frame) # show the frame cv2.imshow("screenshot", frame) # if the user clicks q, it exits if cv2.waitKey(1) == ord("q"): break # make sure everything is closed when exited cv2.destroyAllWindows() out.release()
First, we use the screenshot() function which returns an image object, so we need to convert it to a proper numpy array. After that, we need to convert that frame into RGB, that's because OpenCV uses BGR by default.
The loop will finish once the seconds are passed or if you hit the "q" button. Note that if you increase the FPS, you may see the video is a bit sped up, that's because your CPU can't handle that speed.
If you don't want to see your record in real-time, simply comment out the
cv2.imshow() line and it won't show anything until the recording is finished.
As mentioned in the pyautogui's official documentation, you can also record only regions of your screen, by passing the
region keyword argument which is a four-integer tuple representing the top, left, width, and height of the region to capture, here is how it's done:
img = pyautogui.screenshot(region=(0, 0, 300, 400))
After you are done with recording, just click "q", it will destroy the window and finish writing to the file, try it out!
Alright, there are endless ideas you can use to extend this. For example, you can combine this with an audio recorder, and you'll come up with a Python tool that records your screen and voice simultaneously, you will need to use a thread that records audio and another for the screen recorder. Or you can add an audio file to your video recording.
Or you can create keyboard shortcuts that start, pause, and stop the recording, this tutorial can help you.
Finally, if you're a beginner and want to learn Python, I suggest you take the Python For Everybody Coursera course, in which you'll learn a lot about Python, good luck!
Happy Coding ♥
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