OBS Studio is a powerful software for video recording and live streaming, and it is well known among streamers. Despite it has many features, it is unable to stream to multiple platforms simultaneously. Please read the manual on how to combine OBS Studio and Streamster to split your OBS stream into multiple platforms.
5. Open Streamster software, choose the “OBS-Camera” as a video device, and "OBS-Audio" as an audio device.
Besides the OBS Studio, Streamster is compatible with many other live video editors, splitters, and virtual cameras.