# Use OBS video + audio on Zoom with macOS

MacOS System Audio not Captured via NDI Scan Converter

1. Install or update:
   * OBS Studio 30 or newer
   * Distro AV NDI plug‑in for OBS
   * NDI Tools 6.1.1 for Mac — be sure to tick “Virtual Input” during setup and allow its Camera and Microphone extensions when macOS asks.
2. In OBS open **Tools** then **NDI Output Settings**, enable **Main Output**, give it a name, and click OK.
3. Launch **NDI Virtual Input** (in Applications > NDI). From its menu‑bar icon choose the OBS feed. Restart the app if you just approved permissions.
4. Open Zoom (or Google Meet, Teams, etc.).
   * Pick **NDI Video** for camera.
   * Pick **NDI Audio** (or “NDI Virtual Input”) for microphone. If the virtual mic is missing, reinstall NDI Tools and reboot.

**Issue:**\
When using [**NDI Scan Converter**](https://docs.ndi.video/all/using-ndi/ndi-tools/ndi-tools-for-mac/scan-converter) by itself, the video signal is transmitted over NDI, but the audio is silent or only captures the system microphone. This is expected behavior.

**Solution:**\
Use an audio loopback tool to route system audio into the NDI stream:

* [Blackhole](https://existential.audio/blackhole/)
* [Loopback](https://rogueamoeba.com/loopback/)
* [Soundflower](https://github.com/mattingalls/Soundflower) (deprecated)

**After installation**:

1. Follow the tool’s instructions to route system output to a virtual input.
2. Launch [**NDI Scan Converter**](https://docs.ndi.video/all/using-ndi/ndi-tools/ndi-tools-for-mac/scan-converter).
3. Ensure audio is not muted in the Scan Converter menu.