&maxtotalscenebitrateapplies to scenes and faux-room scenes instead. That is, it splits the total bitrate available for playback by the number of videos in the scene. It's a way to keep the inbound bitrate below a certain threshold. If
&videobitrateis also used,
&videobitratebecomes a max limit on any individual video, so you can set
&videobitrate=2000, to keep all videos below 2-mbps each, but potentially go lower if more than 3 videos are present.