Video Bitrate Parameters

Changing the bitrate of the outgoing and incoming video and for rooms

They are separated in two groups: source side (push) options for the sender of the video and viewer side (view) options for the viewer of the video. Some of them are especially for rooms.

Viewer-side &videobitrate overrides the sender default from &outboundvideobitrate, while &maxvideobitrate remains a software-enforced cap. Room-level limits still apply where relevant.

Depending on browser/negotiation, &videobitrate and &outboundvideobitrate can also be enforced via SDP munging and may act as caps.

Source side options

You have to add them to the source side (&push).

Parameter	Explanation
&outboundvideobitrate	Default target video bitrate for outgoing streams
&maxvideobitrate	Hard max video bitrate out for this publisher, per stream
&limittotalbitrate	Limits the total outbound bitrate
&controlroombitrate	Allows a guest to control their total room video bitrate dynamically from the settings panel (under video settings)
&roombitrate	Limits any guest viewer in the group chat room from pulling the video stream at more than the specified bitrate value
&maxbandwidth	Judges the available bandwidth of a sender's connection

Viewer side options

You have to add them to the viewer side (&room or &view or &scene or &solo).

Parameter	Explanation
&videobitrate	Sets the "desired target" bitrate in kbps
&totalscenebitrate	Max. video bitrate a scene uses
&totalroombitrate	The total bitrate a guest in a room can view video streams with
&totalbitrate	Sets both &totalscenebitrate and &totalroombitrate flags
&zoomedbitrate	Lets you set the target bitrate for a guest when they 'zoom in' (fullscreen) on a video
&optimize	Video bitrate reduced when the video is not visible in OBS (not active in a scene)
&screensharebitrate	Lets you manually set the video bitrate for screen-shares

Room-only and mobile room options

These parameters are for guest room calls where mobile device safety and mesh-network load matter.

Parameter	Explanation
&roomtier1bitrate	Automatic room-only total bitrate tier for weaker mobile devices
&rt1b	Short alias for &roomtier1bitrate
&roomonlylowbitrate	Alias for &roomtier1bitrate
&rolb	Short alias for &roomtier1bitrate
&roomtier2bitrate	Automatic room-only total bitrate tier for normal or stronger devices
&rt2b	Short alias for &roomtier2bitrate
&roomonlybitrate	Alias for &roomtier2bitrate
&rob	Short alias for &roomtier2bitrate
&maxmobilebitrate	Normal mobile sender cap for guest room publishing
&lowmobilebitrate	Lower fallback mobile sender cap for older or overloaded mobile devices
&nomobilebitratecap	Disables only the mobile sender bitrate safety cap

Automatic room-only tiers are meant for guest-only conferencing rooms. If a director or scene viewer is connected, use explicit room or scene bitrate parameters instead.

Related

Room-only mobile bitrate tiersVideo ParametersVideo bitrate in roomsVideo bitrate for push/view links