Zoom and Deepgram

Zoom is a widely-used cloud-based video communications tool that lets you host virtual one-on-one or team meetings, webinars, and live chats and provides audio, video, screen-sharing, and other collaboration features. Zoom offers enhanced Real-Time Messaging Protocol (RTMP) support, which allows you to extract the audio from your content and stream it to Deepgram to get real-time automatic speech recognition for all of your Zoom calls.

In this guide, the audio from a Zoom conference call will be streamed to a local server. We will fork the stream to our Python script, which will send the audio to Deepgram, then receive and print transcriptions to the screen.

In a real implementation, you will likely want to modify the script to provide a callback URL to which transcriptions can be sent.

Before you Begin

Create a Zoom Pro Account

Before you can use Zoom’s live streaming, you’ll need to create a Zoom Pro account. Then:

• enable livestreaming for meetings and webinars
• allow livestreaming on a custom service

Install Development Dependencies

In order to run the services required for this integration, you will need:

• npm
• FFmpeg
• ngrok
• rtmpdump

If you’re using macOS, we recommend using Homebrew to install the above dependencies with brew install <dependency name>. On Linux, your OS package manager can be substituted instead.

You will also need a working Python environment with Python >= 3.6. We will install the required Python packages in the section “Download and Configure the Streaming Script”.

Start the RTMP Server

Because Zoom supports Real-Time Messaging Protocol streaming, we will use a GitHub project called Node Media Server to create a simple RTMP server to receive and view the stream data.

To install and start the Node Media Server, run the following command:

npm i node-media-server -g && node-media-server

That should result in output like:

To visit your new server and verify everything is working, navigate to http://localhost:8000/admin and log in with the username admin and the password admin. You should see the following interface if everything is set up correctly:

Make the Server Publicly Available

Now that we have confirmed the server is running, we’ll need to make it available over the internet so Zoom can send data to it. To do this, we’ll use Ngrok.

We’ll tell Ngrok to forward TCP traffic for port 1935 (the default port Node Media Server uses for RTMP) through a public tunnel. Open a new terminal window and run:

ngrok tcp 1935

The output should look like this:

Make sure to save the forwarding URL which in this case is tcp://2.tcp.ngrok.io:12024. We’ll need to enter this URL in the next step.

Download and Configure the Streaming Script

Next, clone our Deepgram + Zoom repo.

Install Python Dependencies

Navigate to the location where you cloned the Deepgram + Zoom repo. Then run:

pip install -r requirements.txt

There are a few dependencies required for this code. The websockets library is used to send and receive messages from Deepgram. We also need scipy (a scientific library we will use to handle WAV files), streamlink (a command-line utility that extracts streams from various services and pipes them into a chosen video player), and requests (a simple HTTP library).

Configure Deepgram Authentication

Prior to running the script, you must replace the authentication with your Deepgram username and password.

On line 17 of stream.py, replace YOUR_DEEPGRAM_API_KEY with the API Key you created earlier in this tutorial:

1
17        'Authorization': 'Token YOUR_DEEPGRAM_API_KEY'

Set Up Your Zoom Conference Call

Next, you will need to start your Zoom meeting and configure your Zoom live-streaming service:

1. Start your Zoom meeting and join the meeting with computer audio.

   

2. Select More… and then Live on Custom Live Streaming Service.

   

3. Configure streaming, and select Go Live!.

Send Streaming Results to Deepgram

We’re ready to start sending Zoom audio to Deepgram and receiving transcriptions!

Configure the Zoom Streaming Key

Because you could be streaming multiple instances of Zoom at the same time, the script needs to know from which Zoom instance it should get results.

We’ll use RTMPDump to fork Zoom’s audio to Deepgram via our stream.py script .

To do this, run stream_rtmp.sh, found in our Deepgram + Zoom repo. The shell script contains the following:

$
rtmpdump -r $1/$2 --live -o - | python3 stream.py

Here, rtmpdump makes a connection to a specific stream on the specified RTMP server and directs the media content of the stream to our example streaming script (stream.py) for display in your terminal. Parameters include:

Run the Script

To run the script, from the command line, open a new terminal window. Navigate to the location where you cloned the Deepgram + Zoom repo.

Then, run the following command:

$
source stream_rtmp.sh url keyname

Replace url with the the Streaming URL you entered in Zoom. This will be the ngrok URL created in the previous step, plus /live. Remember to modify the URL to start with rtmp:// instead of tcp://.

Replace keyname with the Streaming key you entered in Zoom.

See Results

Start speaking into your microphone. After a brief delay, you should see results of the audio transcription of your livestreaming Zoom call start to appear on your screen.

By default, this script does not return interim results, only finalized transcripts. If you require the fastest possible transcripts (with the potential for less accurate transcriptions), modify line 20 in stream.py to add the parameter interim_results=true.

When interim results are turned on, red output represents interim transcripts, while green text represents final transcripts. To learn more about interim and final transcripts, see Interim Results.