Issue with Multi-Channel Audio Input on macOS with Aggregate Device

Operating System Info

macOS 14

Other OS

No response

OBS Studio Version

30.2.2

OBS Studio Version (Other)

No response

OBS Studio Log URL

no

OBS Studio Crash Log URL

No response

Expected Behavior

I expect OBS Studio to recognize all channels of my aggregate device (Zoom LiveTrak L-8 and BlackHole) and allow me to select and configure each channel individually.

Current Behavior

OBS Studio recognizes the aggregate device only as a stereo device and does not display all available channels.

Steps to Reproduce

1. Create an aggregate device in Audio MIDI Setup, including Zoom LiveTrak L-8 and BlackHole.
2. Configure the aggregate device to combine all channels.
3. In OBS Studio, add a new "Audio Input Capture" source and select the aggregate device.
4. Notice that OBS Studio shows only stereo and does not display all channels of the aggregate device.

Anything else we should know?

I have also tried using other virtual audio devices like Soundflower, but the issue persists. This may be related to limitations in OBS Studio’s handling of multi-channel devices on macOS.

Start by reproducing the issue in macOS Audio MIDI Setup with the Zoom LiveTrak L-8 and BlackHole aggregate device, then follow the OBS Studio “Audio Input Capture” path. Done means OBS recognizes and exposes all channels individually instead of treating the aggregate device as stereo.