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

• debug=loopback sets up a loopback call with yourself.
• 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=true||false toggles audio.
• video=true||false toggles video.

Audio

• stereo=true||false toggles stereo audio input. Does not enable real stereo due to issue 220).
• opusfec=true||false toggles forward error correction for the OPUS codec. Enabled by default.
• opusmaxpbr=bitrate sets the max send bitrate for audio (e.g. 100).
• 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 (e.g. 100).
• arbr=bitrate limits the receive bitrate to the specified value (e.g. 100).

Video

• vsbr=bitrate limits the send bitrate (e.g. 1200).
• vrbr=bitrate limits the receive bitrate (e.g. 1200).
• vsibr=bitrate sets the initial send bitrate (e.g. 600).

Network

• dtls=true||false toggles DTLS. Enabled by default.
• dscp=true||false toggles DSCP (QoS).
• 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> as a URL parameter. More getUserMedia constraints can be found here.

Examples:

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