> Publishing: ;create channel <id> turns a Matrix room into a real, federating PeerTube-compatible video channel -- a Group-typed ActivityPub actor with its own keypair, owned by an already-linked Profile. Reply to an uploaded video with ;publish (key: value metadata lines -- name/category/license/language/tags/sensitive/commentsEnabled -- then a blank line and description) to federate it as a real PeerTube Video, delivered as Create to the owner's own followers and Announce to the channel's, matching PeerTube's own publish choreography.

https://github.com/Haven-Organization/matrix-appservice-activitypub/blob/main/FEATURES.md

this is the only other fediverse project outside Plamenu I have seen that also supports Peertube