Live video on Substack via RTMP

With the live video RTMP feature on Substack, this allows you to stream to the Substack app via a stream key that you can specify in a third party streaming app.

As long as you can stream to MUX and insert a stream key, this feature will work by following the steps below.

Setting the video dimensions:

1. Open OBS and go to Preferences.
2. Select Video.
3. Adjust the base and output resolution to 1080x1920. Do not set it to 1920x1080.
4. Save these changes.

Setting up the stream:

1. Contact the Substack Support team at https://substack.com/support and request the RTMP streaming feature be enabled for your Substack account.
2. On your publication's dashboard, select "New post" and then "New live video". Enter a title, select your audience, and click "Generate stream key".
3. Copy the stream key and head to OBS. Click on Stream found in your settings.
4. Click on Service. From the drown-down menu, select "Show all" and then "MUX".
5. Enter the stream key you generated from your live video post on your Substack publication.
6. Click OK.
7. Start the stream.