You're using RTMP to stream your videos, and are looking to use it for your talks. Currently, there is no way to integrate an RTMP stream directly. Use a platform like Vimeo or YouTube to display the RTMP stream, and then embed that into HeySummit.
Create your Stream under Vimeo or YouTube.
In your encoder stream settings, select the option to stream to YouTube or Vimeo.
Copy the provider’s Stream URL into the encoder’s Server or RTMP server field, and copy the Stream Key into its separate Stream Key field. A provider preset may choose the server for you. Keep the stream key private.
Now you can start your live stream from YouTube or Vimeo.
In your HeySummit event dashboard, go to Content & Schedule > Sessions. Find the session, open Actions, and choose Manage Session.
Open the Broadcast tab. Set Broadcast Type to Live broadcast, then choose YouTube Live or Vimeo Live as the provider to match your stream destination.
Paste the provider’s public viewer URL or video ID into the HeySummit field. This is different from the RTMP ingestion server URL and private stream key used in your encoder. Review the optional playback controls, then choose Save and Close.
Learn more about which encoders work with YouTube or how to connect your encoder or other hardware. Use organiser Preview to check the player and layout, then check the normal session page separately with an existing authorised attendee. Organiser preview can bypass HeySummit ticket checks and scheduled seeking. Provider access settings still apply. Choose content and privacy settings safe for your test; starting an encoder can publish a stream or notify followers.