cam-demo/app.py

from flask import render_template, Flask, send_from_directory, Response
import cv2

app = Flask(__name__)


@app.after_request
def add_header(response):
    response.headers['X-UA-Compatible'] = 'IE=Edge,chrome=1'
    response.headers['Cache-Control'] = 'no-cache, no-store, must-revalidate'
    response.headers['Pragma'] = 'no-cache'
    response.headers['Expires'] = '0'
    return response


def find_camera(id):
    '''
    cameras = ['rtsp://username:password@ip_address:554/user=username_password='password'_channel=channel_number_stream=0.sdp',
    'rtsp://username:password@ip_address:554/user=username_password='password'_channel=channel_number_stream=0.sdp']
    '''
    cameras = ['rtsp://admin:@Unv123456@192.168.10.252:554/unicast/c1/s1/live']
    return cameras[int(id)]
#  for cctv camera use rtsp://username:password@ip_address:554/user=username_password='password'_channel=channel_number_stream=0.sdp' instead of camera
#  for webcam use zero(0)


def gen_frames(camera_id):

    cam = find_camera(camera_id)
    cap=  cv2.VideoCapture(cam)

    while True:
        # for cap in caps:
        # # Capture frame-by-frame
        success, frame = cap.read()  # read the camera frame
        if not success:
            break
        else:
            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')  # concat frame one by one and show result



@app.route('/video_feed/<string:id>/', methods=["GET"])
def video_feed(id):

    """Video streaming route. Put this in the src attribute of an img tag."""
    return Response(gen_frames(id),
                    mimetype='multipart/x-mixed-replace; boundary=frame')


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


@app.route('/video/<string:file_name>')
def stream(file_name):
    video_dir = './video'
    return send_from_directory(video_dir, file_name)


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