Target video bitrate for outgoing video streams (sender-side default).
&outboundvideobitrate sets the default target for viewers that do not specify &videobitrate. If the viewer uses &videobitrate, their request overrides this default. A sender-side &maxvideobitrate still caps the maximum bitrate, regardless of viewer request.
In some cases, &outboundvideobitrate is applied via SDP munging, so it can also act as a maximum cap depending on browser/negotiation.
It won't override the room's total bitrate parameter, as that's a dynamically set bitrate, so to get higher bitrate in group rooms you still need to use&totalroombitrate.
