As a general comment on how you can do this sort of thing super minimally:

You can use ffmpeg on the command line to transcode anything it can read (including streams) to an HLS playlist + segments, and serve those HLS playlist + segments statically using any HTTP server. Then you can write a simple HTML page that uses a video player to play it back in a browser.

I used this to create a simple dashboard page for my home security cams (they provide an RTMP stream I can feed right into ffmpeg) after I got sick of the software I had eating too much CPU (I use '-v:copy -a:copy', so no actually re-encoding happens).

Obviously, this owncast is cool for probably being easier to setup, definitely better looking, and having more features, like chat. I just wanted convey there's nothing magic to doing your own streaming video. More people should do it instead of feeding into the YouTube/Twitch behemoths and untrustworthy cloud IoT stuff.

If you use nginx as your http server then you don't need ffmpeg to cut up your RTMP streams, the nginx rtmp module will read RTMP streams and serve RTMP, HLS, and DASH. Throw the stream module in front of it and you can do RTMPS.

Was this plugin recently re-licensed from paid to open source?

I don't know the paid/OS history of the module but all I had to do to get it was check a checkbox on FreeBSD since it was configured as an option in the port.