AJA I/O Source audio issue with KONA4 - stereo audio in SDI signal re-maps to 2.1 audio

Operating System Info

Windows 10

Other OS

No response

OBS Studio Version

27.2.4

OBS Studio Version (Other)

No response

OBS Studio Log URL

https://obsproject.com/logs/jlnsaeHCLEnKCHFT

OBS Studio Crash Log URL

No response

Expected Behavior

Computer has an AJA KONA4 capture card. Audio embedded into SDI-1 is 2-channel stereo. Expected behavior is for OBS to show video and 2-channel (stereo) audio coming in through the AJA I/O Device Capture Source.

Current Behavior

Audio captured through the AJA I/O Device Capture Source appears re-mapped - audio in on L channel appears on R channel in OBS, and audio in on R channel appears on both channels in OBS.

If OBS is re-set to use 2.1 audio (In Settings > Audio > General > Channels), audio in on L channel appears on channel 1, audio in on R channel appears on channel 2, and channel 0 is empty. The above channel indexing (0-2) is based on what shows up in FFMPEG when ffmpeg is used to examine audio channels in recorded video file.

Steps to Reproduce

1. Install KONA4 capture card
2. Install KONA drivers (using v16.2.0.9, from AJA Control Panel)
3. Connect SDI video source with stereo audio to KONA card
4. Start OBS, create AJA I/O Device capture Source
5. In AJA source settings, select KONA card (mine appears as 0 - KONA4, with a UUID after), and set input to SDI 1
6. In OBS Settings > Audio > General > Channel, set audio to 2.1 (and restart OBS)
7. Record to file

Anything else we should know?

Pre-KONA, the SDI line goes through an AJA SDI Audio Embedder, where the audio on the video line is stripped, and new audio is embedded on L and R. The SDI out of the embedder has been checked and is correct.

Troubleshooting steps:
Uninstalled OBS and re-installed
Looked through settings on AJA Control Panel (included with driver software)

IMPORTANT:
Using AJA Control Room (capture software included with driver software), audio channels show up as stereo (R and L) - i.e. correctly. This is what makes me think the issue is in the OBS AJA plugin.

Start with the AJA I/O Device Capture Source using a KONA4, SDI 1 input, and stereo audio, then reproduce the channel mapping described in the issue. Compare OBS's recorded channel layout with AJA Control Room and the linked OBS log; done means left and right audio remain correctly mapped as a two-channel stereo signal.