In a recent announcement also published on Lemmy Gabe Kangas told about Owncast's roadmap with regards to adding federation features. These include interoperability with PeerTube.

Both PeerTube and Owncast are are now both members of SocialHub, the community of technologists and fedizen that collaboratively evolve the fediverse foundation.

I encourage anyone willing to help envision how this interop may look like to become a member too and participate in forum discussions. Alternatively you can also use the SocialHub companion Fediverse Futures brainstorming space on Lemmy.