Audio drift


New Member
Hello, can someone please suggest a fix for my issue?
Using Mac, I record the video (CBR) and a reference track of the audio in OBS, at the same time I record into Reaper on a separate computer.
All sample rates are set to 48k, frame rates are 24p.

The video and audio I record in OBS stay in sync but the audio I record in Reaper chases the video by the end of a 3 minute clip.
So far I have been time stretching the OBS file to match the Reaper audio, but I feel like I shouldn't need to do that.

Any suggestions?