StreamMulticast

A free OBS Studio plugin for streaming to several platforms at once, each with its own bitrate, encoder and orientation.

v1.1.0 Windows x64 Free & open source

Download free (ZIP, 3.4 MB) View on GitHub

What it does

Stream to multiple RTMP endpoints at the same time: Twitch, YouTube, Facebook, Kick, Trovo or any custom server
Set the encoder and bitrate per endpoint (x264, NVENC, QSV, AMF)
Run horizontal and vertical streams in parallel, with an editable vertical canvas for TikTok and Shorts
Record the vertical canvas and save vertical clips from a replay buffer
Watch bitrate, dropped frames and reconnects live, with health alerts inside OBS

Install

Download the ZIP and close OBS.
Extract the ZIP into your OBS folder, usually C:\Program Files\obs-studio\.
Start OBS and open View → Docks → Multistream.

Built against OBS Studio 31.1. Windows only for now.

Privacy and license

No account, no cloud, no telemetry. The plugin only connects to the endpoints you configure. Stream keys are stored locally in plain text, the same way OBS stores its own key.

Licensed under GPL-2.0-or-later. The full source code and all releases are on GitHub.