&stereo

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&stereo
Sets the audio mode to stereo and changes default audio settings to improve audio quality
General Option! (&push, &room, &view, &scene)
Aliases
&s
&proaudio
Details
Adding &stereo to the URL will apply audio-specific setting presets. For inbound audio streams, it can be used to increase the audio bitrate from 32-kbps to 256-kbps. For outbound streams, it will disable echo-cancellation and noise-reduction. When applied to both the outbound and inbound sides of an audio stream, it will also enable stereo audio if available.
There are a variety of different modes that apply different combination of presets. You can also override any preset with other URL parameters, such as &audiobitrate, &outboundaudiobitrate, and &aec=1. 
If using a microphone, wearing headphones is strongly recommended if using this parameter, along with knowledge of correctly setting your microphone gain settings. Echo and feedback issues can occur if this option is used incorrectly.
When using this option in a group room, you can't simply just apply this URL option to the director and have it apply to all guests. You will need to add the flag to each guest and to each scene-link to enable the pro-audio stereo mode. Depending on the value you pass to the URL parameter, you will get slightly different outcomes.
Options
Value
Description
0
will try to down-mix your mic to mono. Does not enable any pro-audio settings
1
enables it for both push and view (if used on both links)
2
enables it just for viewing requests and not publishing requests
3
enables it for just publishing requests and not viewing requests
4
enables 5.1-multichannel audio support (Experimental and may require a Chrome flag to be set)
5
This is the default if nothing is set. It behaves like 3 or 1, depending on if you are a guest or not
(no value given)
It behaves like 3 or 1, depending on if you are a guest or not
More Details
&stereo and &proaudio currently do the same thing, so they are just aliases of each other. When used, they can be used to setup the audio transfer pipeline to allow for unprocessed, high-bitrate, stereo audio.  
Use of this option is generally for advanced users who understand the consequences of enabling this. High-quality audio can cause audio clicking, reduced video quality, feedback issues, low volume levels, and higher background noise levels.
For stereo-channel support to work, you will want both the viewer AND the publisher of the stream to have the respective &stereo flag add to their URL. 
You can customize things further using &aec, &ag, &dn, &ab and &mono. These flags will override the presets applied by the &stereo flag.  Please note, depending on your browser, enabling &aec, &ag, or &dn can force disable stereo audio.
The most powerful mode is stereo=1 , which if enabled:
Turns off audio normalization or auto-gain when publishing (&push)
Turns off noise-cancellation when publishing
Turns off echo-cancellation when publishing
Enables higher audio bitrate playback, up to 256-kbps, when listening (&view)
If the parameter is used, but left without a value, it is treated as a special case (either 1 or 3). Please see follow link for more info: 
​https://docs.google.com/spreadsheets/d/e/2PACX-1vS7Up5jgXPcmg_tN52JLgXBZG3wfHB3pZDQWimzxixiuRIDbeMdmU11fgrMpdYFT6yy4Igrkc9hnReY/pubhtml​
Option
alias
aec
autogain
denoise
stereo playback
stereo output
default ab in
max ab out
limited ab in
cbr
&stereo=0
off
on
on
on
off
no
32
510
510
no
&stereo=1
both
off
off
off
on
yes
256
510
510
yes
&stereo=2
in
on
on
on
on
no
256
510
510
yes
&stereo=3
out
off
off
off
off
yes
32
510
510
no
&stereo=4
multi
off
off
off
on (5.1)
yes
256
510
510
yes
Newbie mode
The default mode when &stereo is used alone is &stereo=5, which acts like either &stereo=3 or &stereo=1, depending on whether the link its applied to is a room guest or not. This option will make the most sense for most users.
Option
Context
alias
aec
autogain
denoise
stereo playback
stereo output
default ab in
max ab out
limited ab in
cbr
&stereo=5
Regular/OBS
5
off
off
off
on
yes
256
510
510
yes
&stereo=5
Director
5
off
off
off
on
yes
32
510
510
no
&stereo=5
Room Guest
5
off
off
off
off
yes
32
510
510
no
iOS Devices
Option
alias
aec
autogain
denoise
stereo playback
stereo output
default ab in
max ab out
limited ab in
cbr
iOS devices
​
on
on
on
off
off
32
32
32
no
Just for reference, the audio codec used by VDO.Ninja is OPUS (48khz), which can provide high-fidelity music transfer when the audio bitrate is set to 80-kbps per channel or higher. The default audio bitrate used is 32-kbps VBR, which is sufficient for most voice applications. Increasing the audio bitrate to a near-lossless 500-kbps or something may end up causing more problems than anything, but that is supported if needed.
Related
&audiobitrate
&outboundaudiobitrate
&screensharestereo
&noaudioprocessing
&aec
Last modified 1mo ago
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