Not entirely sure how that would work, but it would be a cool idea anyhow
Maybe a hook into Peertube or Owncast? although hooking into those might be out of scope for a Lemmy client idk
Edit: RPAN was Reddit's short-lived livestreaming experiment, which ended up being killed due to the cost of running a service like that.
How i envision it working within Mlem is that it would display an in-app embed (or native support) for videos hosted via PeerTube or Owncast in the feed (possibly taking up the native resolution / aspect ratio)
To improve discoverability, mlem would (theoretically) recommend communities that are tagged (probably via a #tag in the description) or something like that
We're focusing on building the best Lemmy client possible right now, and aren't considering branching out to cover multiple platforms. If we do ever consider that, it'll be in the far future once the client is properly polished. Lemmy themselves are discussing potential video support - if that's implemented into Lemmy, we would of course try to support it.