How to Stream Video From Raspberry Pi to Local - USB Camera

Discover how to stream video from a USB-based camera to your local computer via the local network using Python 3 and Flask with the Picamera2 library. This tutorial builds upon Part 1, where we demonstrated the same process using a Raspberry Pi camera module. Here, we leverage PiCamera2, supported by the Raspberry Pi community, to achieve seamless streaming with your USB-based camera.

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We need to install flask, opencv, and picamera2 using the apt installer on our raspberry pi. Go into a terminal and run the following commands

sudo apt update
sudo apt install python3-opencv python3-flask python3-picamera2

If you are still having issues with packages later down the line, try using pip to install these packages.

Now that you have the packages installed you can go ahead and create a python script on your device, name it however you like. Also be sure to have your USB camera plugged in at this point.

The code is as follows:

from flask import Flask, Response
from picamera2 import Picamera2
import cv2

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app = Flask(__name__)

camera = Picamera2()
camera.configure(camera.create_preview_configuration(main={"format": 'XRGB8888', "size": (640, 480)}))
camera.start()

def generate_frames():
    while True:
        frame = camera.capture_array()
        ret, buffer = cv2.imencode('.jpg', frame)
        frame = buffer.tobytes()
        yield (b'--frame\r\n'
               b'Content-Type: image/jpeg\r\n\r\n' + frame + b'\r\n')

@app.route('/video_feed')
def video_feed():
    return Response(generate_frames(), mimetype='multipart/x-mixed-replace; boundary=frame')

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5000)

This code is a Flask web application that streams video frames from a Raspberry Pi camera module (Picamera2) to a web page. Here's a concise explanation of what the code does:

• It imports the necessary libraries: Flask for creating the web application, Picamera2 for interacting with the camera module, and cv2 (OpenCV) for image processing.
• It creates a Flask application instance and initializes the Picamera2 object.
• It configures the camera settings, specifying the format and size of the preview frames.
• The generate_frames() function continuously captures frames from the camera, encodes them as JPEG images, and yields them as byte strings with appropriate headers for streaming.
• The /video_feed route is defined, which calls the generate_frames() function and returns a Response object with the appropriate MIME type for streaming the video frames.
• Finally, the Flask application is run on the host '0.0.0.0' (accessible from any IP address) and port 5000.

When this code is run on a Raspberry Pi with a camera module, it starts a web server that streams the live video feed from the camera. The video feed can be accessed by visiting the /video_feed endpoint in a web browser.

You can access the webstream from your local computer if you go to a browser and type in the following:

http://<Your Raspberry Pi IP>:5000/video_feed

You can get your IP address of your Raspberry Pi by entering a terminal on the Raspberry Pi and typing the command ifconfig. You can then find the IP address in the inet section.

Once this is done you will see a video stream in your chrome browser!

In this tutorial, we've explored how to stream video from a USB-based camera to your local computer using Python 3, Flask, and the Picamera2 library on a Raspberry Pi. By leveraging the power of these tools, you can easily set up a seamless video streaming solution for your projects.

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