Microphone and Audio Capture Configuration
Instructions for configuring microphone and tab audio capture permissions
By default, the browser will prompt the first time PixieBrix requests to use the microphone.
Manually Allowing/Blocking Microphone Capture
Navigate to Settings > Privacy & Security > Site Settings > Microphone > PixieBrix.
For the Microphone permission, select "Allow" from the dropdown.

Allowlisting PixieBrix Audio Capture via Policy
To automatically allow audio capture using PixieBrix, use the following Chrome policies:
Microphone: AudioCaptureAllowedUrls
Tab Audio: TabCaptureAllowedByOrigins
For more information on URL patterns, see Chrome's documentation for Enterprise policy URL pattern format.
List of strings
PixieBrix: [*.]mpjjildhmpddojocokjkgmlkkkfjnepo
PixieBrix BETA: [*.]mpapkmgkphbggmlekkfnoilmafnbfile
List of strings
PixieBrix: [*.]mpjjildhmpddojocokjkgmlkkkfjnepo
PixieBrix BETA: [*.]mpapkmgkphbggmlekkfnoilmafnbfile
Example: Setting the AudioCaptureAllowedUrls policy via Windows Registry
To set the AudioCaptureAllowedUrls
policy via Windows Registry, create a key for Software\Policies\Google\Chrome\AudioCaptureAllowedUrls
and add a REG_SZ
value for each allowlist entry (entries for list keys should be 1, 2, 3, ...):

Configuring the default Audio Capture Policy
To configure the default allow/deny audio capture policies across all extensions/websites, use the following policies:
AudioCaptureAllowed: microphone
ScreenCaptureAllowed: tab audio
If set to false, only allowlisted extensions/origins will be able to capture audio. See the previous section:Microphone and Audio Capture Configuration
Software\Policies\Google\Chrome\AudioCaptureAllowed
REG_DWORD
1
Frequently Asked Questions
How do I determine my browser's default microphone?
To view your browser's default microphone, visit Settings > Privacy & Security > Site Settings > Microphone. The microphones available to your browser will be listed in a drop-down:
chrome://settings/content/microphone
Why does PixieBrix sometimes show the tab picker to capture system audio?
Chrome's permissions model currently only allows automatic tab media capture if the user has invoked the extension on the tab by:
Clicking the icon in the toolbar
Clicking a native context menu action
Invoking a registered Chrome keyboard shortcut associated with the extension
In other situations, PixieBrix must fall back to showing the tab picker. We're working with the browser vendors to adjust the requirements
What audio codec does PixieBrix capture/stream in?
PixieBrix uses the state-of-the-art Opus codec in WebM audio format (MIME type: audio/webm;codecs="opus"
). For more details, see Mozilla's Audio Codecs Guide
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