Fixing “No video with supported format and MIME type found” error when streaming screen in Flask

What will you learn?

In this tutorial, you will learn how to troubleshoot and fix the common error message “No video with supported format and MIME type found” that often occurs when attempting to capture your screen and stream it using Flask.

Introduction to the Problem and Solution

Encountering the “No video with supported format and MIME type found” error while trying to stream your screen via a Flask web application can be frustrating. This issue typically arises due to incorrect handling of media types by Flask. To overcome this problem, it is crucial to ensure that the appropriate content type is set for the streamed video data.


from flask import Flask, Response

app = Flask(__name__)

def stream_video():
    def generate_frames():
        # Your code here to generate individual frames of the screen recording
        yield b'--frame\r\nContent-Type: image/jpeg\r\n\r\n' + frame_data + b'\r\n'  # Ensure correct content-type

    return Response(generate_frames(), mimetype='multipart/x-mixed-replace; boundary=frame')

if __name__ == '__main__':

# Copyright PHD


To address the issue: – Create a route / in your Flask application. – Define generate_frames() as a generator function inside stream_video(), yielding individual screen recording frames. – Ensure each yielded frame includes proper content-type information for compatibility. – Return a Response object with the generator function passed and specify mimetype as multipart/x-mixed-replace.

    How do I install necessary libraries for capturing my screen?

    To capture your screen, install libraries like OpenCV or Pyautogui using pip:

    pip install opencv-python pyautogui
    # Copyright PHD

    Can I stream audio along with my screen using this method?

    This solution focuses on video streaming only. Additional configurations are required for audio streaming.

    Is there a limit on the number of frames I can stream per second?

    The frame rate depends on factors like processing power and network capabilities.

    Can I apply filters or effects before streaming my screen?

    Yes, modify each frame before yielding it in generate_frames() for real-time effects.

    Will this solution work for live streaming from external cameras too?

    Adapt this approach for live streaming from external cameras by adjusting how frames are captured.


    Efficiently handling multimedia data types is essential when streaming screens in web applications. By setting appropriate content types in responses, you can effectively resolve errors related to unsupported formats. For more Python-related guidance, visit our website at

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