hello-websocket

Webcam over websocket in Python using OpenCV and Tornado <http://www.tornadoweb.org>_.

How it works

A recorder process continuously reads images from a webcam. Upon every capture, it writes the image to a Redis key-value store.

A separate server process (running Tornado) handles websocket requests sent by a client (web browser). Upon receiving a request, it retrieves the latest image from the Redis database and sends it to the client over the established websocket connection.

.. image:: https://github.com/vmlaker/hello-websocket/blob/master/diagram.png?raw=true

The client web page is dead simple: It sends an initial request on a websocket. When image data arrives, it assigns it to src attribute of the <img> tag, then simply sends the next request. That's it!

Installation

Install Redis server::

apt install redis-server

Build the virtual environment with all needed modules::

make

Usage

Two separate programs need to be running: 1) the recorder which captures and writes to Redis database, and 2) the server which reads the current image from the database and serves to requesting WebSocket clients.

Run the recorder::

make recorder

Now (in a different shell) run the server::

make server

Go to http://localhost:9000 to view the webcam.