Question / Help Audio Desync Issue

[evildiscoguy]

Hey everyone, I've got a weird audio desync that seems to happen in under an hour when I'm streaming. I've noticed that the stream starts off fine (I have a 21ms buffer on the webcam as that's my mic latency) but about an hour in, I'm out of sync.

Log File: https://obsproject.com/logs/g3TymNZUrn-KC8NZ

I have Use Device Timestamps unticked on all audio devices, my CPU usage in OBS is around 10% at highest, no dropped frames (my log says one lagged frame due to rendering) and I have all my devices set to output at 16bit 48khz. My CPU wasn't hitting 100% (according to Riva) and this happens whenever I stream on all games.

My CPU is a Ryzen 1600, graphics is a 1660ti and I have 16GB RAM (using Windows 10 1809). I use Reaper to pass my audio through to VAC, Reaper doesn't show any lag in the Master column while there's obvious lag in the audio monitor part on OBS. I have found that resetting my audio device in Reaper brings the sync back in OBS but there isn't any lag in Reaper if I record (before resetting).

Any help, I'm really confused.

 

[evildiscoguy]

https://www.twitch.tv/videos/394620120

There's an example on Twitch, watch at the beginning and then at the end.

 

[evildiscoguy]

This is my Reaper setup btw, just if people need to see it. It's taking audio from my Focusrite Solo, got my buffer set to 1024 which is quite high (causing the 21ms latency) to make sure there's no audio sound quality issues.

EDIT: Just so I don't keep replying, I've left my Reaper and OBS open without recording or streaming since I finished and the audio desync is back again.