OBS Audio Monitor

OBS Audio Monitor is a plugin for OBS Studio that adds an audio monitoring dock and specialized filters. It allows routing audio from an OBS source to a specific audio device by adding the Audio Monitor filter to the source within OBS Studio. This functionality serves specific production situations: monitoring a source on multiple devices, audio monitoring without video synchronization delays, and separate audio monitoring levels per source and device.

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• Multi-Device Monitoring. The primary function allows sending audio from a specific source to multiple output devices simultaneously. Each audio source in OBS Studio can be configured with its own independent monitoring destination. This capability is essential in professional streaming setups where audio needs to be isolated for different purposes.
• Low Latency. The system operates with low-latency audio processing, critical for real-time monitoring. Audio is routed directly to the selected device without going through OBS's video synchronization chain, eliminating delays in the monitoring signal.
• Per-Source Filter. It is implemented as a filter applicable to any audio source within OBS Studio. This deep integration allows granular control over which specific sources are monitored and to which devices they are sent.
• Device Selector. Includes a comprehensive selector of audio devices available on the system. It automatically detects all output devices recognized by the operating system and presents them in a dropdown list for immediate selection.
• Level Control. Provides independent volume control for each monitoring instance. This gain adjustment operates independently of OBS's main volume controls, allowing customized monitoring levels for each use case.
• Silent Monitoring. Option to disable monitoring in the OBS main mixer while keeping the output to the monitoring device active. This feature is essential to avoid audio loops and feedback in complex configurations.
• Cross-Platform Compatibility. The plugin is designed to work on Windows, macOS, and Linux. It maintains consistency in functionality and interface across the different operating systems supported by OBS Studio.
• OBS Dock Integration. Adds a customizable dockable panel to the main OBS Studio interface. This panel provides a consolidated view of all active monitoring instances and their respective configurations.
• Configuration Persistence. All monitoring settings are saved within the OBS Studio scene. Source-device associations are maintained between sessions, preserving the workflow setup across different program starts.
• Status Monitoring. Provides visual indicators of audio activity in the dock panel. These meters show the signal level being sent to each monitoring device, verifying the active audio flow.

The plugin was created by developers from the OBS community who identified the limitation of not being able to route audio to specific devices. The code is primarily written in C++ using OBS Studio's public APIs, with platform-specific components handling native audio interfaces on Windows (WASAPI), macOS (Core Audio), and Linux (PulseAudio/ALSA).

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