Awesome

win-capture-audio

An OBS plugin similar to OBS's win-capture/game-capture that allows for audio capture from a specific application, rather than the system's audio as a whole. This eliminates the need for third-party software or hardware audio mixing tools that introduce complexity, and in the case of software tools, introduce mandatory latency.

Internally it uses ActivateAudioInterfaceAsync with AUDIOCLIENT_PROCESS_LOOPBACK_PARAMS. This initialization structure is only officially available on Windows 11, however it appears to work additionally on relatively recent versions of Windows 10.

This plugin is in a BETA state, expect issues - https://discord.gg/4D5Yk5gFnM for support and updates.<br/> An updated version of Windows 10 2004 (released 2020-05-27) or later is required.

Want to support the development of the plugin? https://ko-fi.com/bozbez

overview

Installation and Usage

Head over to the Releases page and download the latest installer (or zip if you are using a portable installation)
Run the setup wizard, selecting your root OBS folder (obs-studio/, not obs-studio/obs-plugins/) when asked (or extract the zip to the portable OBS root directory)
Launch OBS and check out the newly available "Application Audio Output Capture" source

Troubleshooting

Application Audio Output Capture source not showing up after install: this means that either your OBS is out-of-date (check that it is at least 27.1.x) or you have installed the plugin to the wrong location. To re-install, first uninstall via "Add or remove programs" in the Windows settings, and then run the installer again. Make sure to select the top-level obs-studio/ folder in (probably) C:/Program Files/.
Application Audio Output Capture source not picking up any audio: this happens when your Windows is too old and does not have support for the API. Note that even if you have a more recent major version such as 20H2 you will still need the latest updates for the plugin to work. If you are on a very old version you might need more than one update for this to work, and the second update might not show up for a few days after the first update.