https://obsproject.com/forum/resources/how-to-set-up-your-own-private-rtmp-server-using-nginx.50/
if you want 1 to many stream
It might be helpful to know what your use case is. This isn't a normal use of OBS, and it may be that what you want can be achieved another way, but hard to tell without knowing exactly what you are trying to do.
You can do excactly that with the provided link if you add ffmpeg in the mix. https://trac.ffmpeg.org/wiki/StreamingGuideThe thing is, there no specific goal. Just curious if there is an option to use one OBS window stream to one place with a 4k resolution and the second OBS window duplicates the first stream to broadcast to another place with a lower resolution.
You can do excactly that with the provided link if you add ffmpeg in the mix. https://trac.ffmpeg.org/wiki/StreamingGuide