Simulcast is a technique where a video stream is encoded twice, each time with different parameters (such as bitrate, resolution, etc). A user will then be forwarded one of these streams, depending on the quality of their connection.
SVC is a similar technique where a video stream is encoded as a collection of "layers", where each layer progressively adds more detail and quality to the outbound video. A user will be forwarded one or more of these layers, depending on the quality of their connection.
These techniques will allow the SFU to simultaneously forward a high quality stream to clients that can handle the bandwidth while also forwarding a lower quality stream to lower end clients.
Please sign in to leave a comment.