Twilio Video Demo

This is the code written during the live Twilio Video demo during Twilio's Signal 2021 Superclass.

It creates a simple Video application that displays a virtual knitting circle and populates each yarn ball with an HTML video element when a participant enters the Room.

The main branch contains the base code where we began our live demo. Check out the superclass-demo branch to see the completed code that we wrote during the session.

Running the application

You'll need Python3 to get this running. To install the required dependencies:

python3 -m venv venv  # create a virtual environment
source venv/bin/activate
pip install -r requirements.txt

Next, create a .env file. You'll put your account credentials in that file, so that the Flask server can connect to Twilio.

touch .env

In the .env file, you'll want these credentials:

TWILIO_ACCOUNT_SID=<your account SID>
TWILIO_API_KEY=<your api key>
TWILIO_API_SECRET=<your api key secret>

You can find your account SID in the Twilio Console Dashboard.

You can create a new API key and get the secret through the Twilio Console.

To run the Flask server:

source venv/bin/activate
python server.py

This will start a server that you can access on your local machine at port 5000 (localhost:5000). You can view the application at http://localhost:5000.

Can't wait to see what you build with Twilio Video!

Other branches

• superclass-demo: The code we wrote in this class (to be committed after the demo is over)
• blurred-backgrounds: Uses Twilio's Video Processors to blur a participant's background
• livestream: Uses Twilio Live to livestream the video room
• full-commented-code: A full version of the application we're building during the Superclass, with comments on each aspect

Other Resources

• Full-featured Twilio Video React app

Troubleshooting and Diagnostics

• Video Insights
• Preflight check API
• Video Diagnostics App
• Video Monitor
• Network Quality API

Virtual Backgrounds and Custom Video Filters

• Demo
• General information
• Custom filters
• Virtual background

Twilio Live

• Twilio Live overview
• Live video demo application
• Build a video livestreaming application with Twilio Live and Express
• Live stream your screen
• Billing and resource management best practices

Other

• Ad-hoc room creation: Create a Room from the browser, without a server
• Dominant Speaker Detection: Detect the currently active speaker in a Room
• Track Subscription API: Fine-tune which tracks participants will subscribe to in a Room
• Recordings and compositions: Record group rooms and lay them out in a specific format with compositions.
• Simulcast: Use simulcast to enhance the quality of group rooms for participants with different connectivity options
• Network Bandwidth Profile API: Specify how tracks will be prioritized based on participant bandwidth