Multi-bitrate support

The Streaming APIs (Millicast) use client-side ABR (referred to as “Simulcast” in the WebRTC world). This is currently supported in our browser-based broadcaster and in our OBS-WebRTC fork.

You may refer to this blog post if you want to learn more:

https://medium.com/millicast/millicast-2-0-and-simulcast-why-you-want-it-why-nobody-else-has-it-945644a596e1

Millicast also enables users to stream RTMP MBR (Multi-Bitrate) for delivery via WebRTC Simulcast. This gives the streamer the ability to use their RTMP encoder to control their RTMP multi-bitrate renditions, and provide "adaptive bitrate" delivery in the Millicast web player using WebRTC Simulcast:

https://docs.dolby.io/streaming-api/docs/stream-rtmp-mbr-to-webrtc-simulcast