AppRTC URL parameter guide

This page contains URL parameters that control certain features in WebRTC and AppRTC.

How to

Use a query string to apply the parameters.
Example: https://apprtc.appspot.com/?r=123133&hd=true

Parameters

General

• r=roomName specify room name.
• hd=true||false toggles HD (1280x720||640x480). Enabled by default on Chrome.
• tt=time sets channel timeout. Default is 30 and max is 1440 minutes.

Audio

• stereo=true||false toggles stereo audio input. (currently only sets the SDP, see issue x).
• opusfec=true||false toggles forward error correction for the OPUS codec.
• opusmaxpbr=bitrate sets the max send bitrate for audio.
• asc=codecname/samplerate sets the specified codec and sample rate as send audio codec. (e.g. ISAC/16000)
• arc=codecname/samplerate sets the specified codec and sample rate as receive audio codec. (e.g. OPUS/48000)
• asbr=bitrate limits the send bitrate to the specified value.
• arbr=bitrate limits the receive bitrate to the specified value

Video

• vsbr=bitrate limits the send bitrate.
• vrbr=bitrate limits the receive bitrate.
• vsibr=bitrate sets the initial send bitrate.

Network

• dtls=true||false toggles DTLS. Enabled by default.
• dscp=true||false toggles dscp
• ipv6=true||false toggles ipv6 candidates
• ss=stunserver sets specified stun server.
• ts=turnserver sets specified turn server.
• tp=password password for turn server

Rendering

• ssr=true||false toggles stereoscopic rendering. Expects remote video to be a side-by-side view of two cameras' captures, which will each be fed to one eye.

GetUserMedia constraints

Constraints can also be passed directly as URL parameters simply by adding audio/video=<constraint1>,<constraint2>.
Examples:

• https://apprtc.appspot.com/?audio=echoCancellation=false disables audio processing which allows stereo input (APM only supports mono at the moment)
• https://apprtc.appspot.com/?video=maxWidth=1280, maxHeight=720, minWidth=1280, minHeight=720forces the camera to open in HD else it will fail. Same as hd=true param.