FWIW, that is the same setup we have for our signing service using ATEM Mini Pro running 8.4:
Started 2 weeks ago making that the third time the setup has been used. Only difference I can think of is the PC generated inset (via spliter) comes from a 150' fiber cable (HDMI 1), camera is A5100 (60 fps = out) on 10' HDMI cable (HDMI 2). Audio (Mic 1) and Ethernet are bundled with the fiber cable (so also ~150' each).
Now that I think about it, we have another setup that is the same as well, just running at 30 fps and no fiber.
I have had reports from some Live Stream viewers seeing that same 1 - 2 second delay, and I've seen it too on videos on youtube that are not ours. What I see and hear are not repeatable, and goes away with browser / player refresh. Its never in the recording.
I am now starting to record the events on USB drive, so far not seen anything. Other than settings and recording, I'm not using the USB. I have a parallel setup to that one running the audio into the XLR on the camera (panasonic 24 fps - out) going into HDMI 2.
HTH
victorytabernacle wrote:I have experienced audio drift for as long as I've had my ATEM mini. I have used two completely different PC's. The most recent being a Dell i7 with 16GB ram. I have gone through two different software packages OBS and XSplit for live streaming. The audio is behind the video about 1-2 frames per second every 5 minutes and that continues to drift the longer the stream. This issue occurs when you use video from the HDMI ports and audio from the mic inputs. My mic 1 input is coming from a Allen and Heath QU-16 digital mixer. Some posts I have read just HDMI for both audio and video. I'm not convinced that is an accurate test for this issue. I'm seeing it when video is from HDMI and audio is from mic 1. I have upgraded the firm along the way and now at 8.4. After hundreds of test and many, many combinations of settings, I was able to fix the issue by eliminating the mic 1 input and plugging it directly into the mic input on the PC and keeping the video from the ATEM USB connection. This eliminated the audio from the ATEM USB connection. I've been looking at everything including the audio sampling rate. Are there any settings or other places I could check? For example, USB output settings from the ATEM, device driver settings on the PC USB driver or the windows USB settings? I'm going to be running my stream with my band-aid fix until I get a concrete solution. It either has to be an issue with the audio and video coming from the ATEM via the USB or a setting on the USB driver, etc that is causing the issue. Any thoughts are appreciated. I've gotten, what I think, are useless suggestions from support asking me to try yet a third PC or third software package. When you completely replace a component with an entirely new or different solution, then in my mind that eliminates those pieces from the equation. It seems to be narrowed down to the combined USB from the ATEM or the audio processing from the USB audio on the PC side.