Multicast video streaming has several important characteristics:
* A. Multicast can help to save bandwidth in a network because it allows the same video stream to be delivered to multiple users simultaneously, reducing the need for multiple unicast streams.
* B. Multicast can typically not be used to provide video over the internet because many routers and firewalls do not support multicast traffic across the internet, which is more suited for local network environments.
* D. Multicast extends the viewer capacity of a camera or an encoder from 10-20 to an unlimited number, as it does not rely on multiple individual connections to distribute the video stream.
Reference: Axis Communications - Multicast Streaming