Serve current JPG frame via HTTP get from an MJPG stream

mjpg2jpg.py

#!/usr/bin/env python3

import cv2
import time
from threading import Thread

from flask import Flask, Response
app = Flask(__name__)

out = None

class CaptureThread:
	def __init__(self):
		thread = Thread(target=self.run, args=())
		thread.daemon = True
		thread.start()

	def run(self):
		global out
		cap = cv2.VideoCapture('http://192.168.178.20/video.mjpg')
		while True:
			ret, frame = cap.read()
			if ret:
				out = bytearray(cv2.imencode('.jpg', frame)[1])
			else:
				time.sleep(0.01)

t = CaptureThread()

@app.route('/snapshot.jpg')
def snapshot():
	resp = Response(response=out, status=200, mimetype='image/jpg')
	return resp