&scene=0by default has all videos in the room automatically added to the scene. They cannot be removed.
&scene=1by default has no videos added to the scene. Videos need to be added manually by the director. Videos not yet added to the scene are connected, and streaming at around 400-kbps, so when they become active they appear immediately. Bitrate will ramp up after a second to the target bitrate of, normally, 2500-kbps or whatever is set via the URL.
&scene=1, except the video streams that are not yet added to the scene yet are disable with 0-bitrate used. They are connected, but not actively streaming any video data, so it takes a moment longer for videos to appear once added.
Nis a string or integer - it's just like
&scene=2. There are buttons marked S3, S4, .. S8 in the director's room to control these scene types. If they are not already there, new buttons for them will be created automatically when used. See the video below.