Example of Flask server video streaming

flask_video_streaming.py

import os
import sys
import re
import mimetypes
from flask import Flask, render_template, request, send_file, Response

app = Flask(__name__)

filename = '/Users/agutoli/Downloads/test1.mp4'

def send_file_partial(file, filename):
    """
    Simple wrapper around send_file which handles HTTP 206 Partial Content
    :param file - io.BytesIO object
    :param filename
    :return - flask response object
    """
    size = os.path.getsize(file.name)

    range_header = request.headers.get('Range', None)
    if not range_header:
        return send_file(file, attachment_filename=filename, conditional=True)

    byte1, byte2 = 0, None

    m = re.search('(\d+)-(\d*)', range_header)
    g = m.groups()

    if g[0]:
        byte1 = int(g[0])
    if g[1]:
        byte2 = int(g[1])

    length = size - byte1
    if byte2 is not None:
        length = byte2 - byte1 + 1

    file.seek(byte1)
    data = file.read(length)

    response = Response(data,
                  206,
                  mimetype=mimetypes.guess_type(filename)[0],
                  direct_passthrough=True)
    response.headers.add('Content-Range', 'bytes {0}-{1}/{2}'.format(byte1, byte1 + length - 1, size))
    response.headers.add('Accept-Ranges', 'bytes')
    return response

@app.route('/')
def index():
    return render_template('index.html')

@app.route('/myvideo.mp4')
def video():
    size = os.path.getsize(filename)
    with open(filename, 'rb') as file:
        return send_file_partial(file, file.name)

if __name__ == '__main__':
	app.run(debug=True)