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 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

• Loopback

• Soundflower (deprecated)

After installation:

1. Follow the tool’s instructions to route system output to a virtual input.

2. Launch NDI Scan Converter.

3. Ensure audio is not muted in the Scan Converter menu.