disable the video camera automatically. No option to change it during setup is provided.
auto-select the default video camera. No option to change it will be allowed.
auto-select a video device that has a label containing that same string / deviceID
It can be changed after the connection has been established. Useful for helping a remote guest skip-past the complex setup of their camera/audio.
You can use this option to also disable a guest's camera, potentially allowing for guest connections that have no video or audio. This is a great option if you want to use midi-only transport, add some hidden IFRAME control, or just wanted to text chat.
For a device like an iPhone, you can pass a string value such as
&vd=back to specify the back camera by default. For Android, you might try
rear instead of
back, but it will depend on the name the manufacture gave the camera.
When combined with
&autostart, you can have the camera start publishing instantly, often without any user interaction at all. Keep in mind that some browsers will still need to ask for permissions or require a user-gesture for things to function correctly though.