注意我们的return返回值必须是以下之一，否则会报错

from flask import Flask, render_template, Response
import cv2app = Flask(__name__)@app.route('/')
def index():return render_template('index.html')def gen(camera):while True:success, image = camera.read()if not success:breakret, jpeg = cv2.imencode('.jpg', image)frame = jpeg.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():camera = cv2.VideoCapture(0)return Response(gen(camera), mimetype='multipart/x-mixed-replace; boundary=frame')if __name__ == '__main__':app.run()

运行后输入路由