A/V desync when playing media source

Operating System Info

macOS 12

Other OS

No response

OBS Studio Version

28.1.2

OBS Studio Version (Other)

No response

OBS Studio Log URL

https://obsproject.com/logs/k0zjQjDCQH6qvFJd

OBS Studio Crash Log URL

No response

Expected Behavior

For each recording the A/V sync should be the same so that you can adjust eventual sync issues with the Sync Offset feature.

Current Behavior

With each recording the A/V sync is different. It varies up to 100 ms in both directions in my tests. This makes corrections with the Sync Offset tool impossible. I used the method from following post:
https://streamgeeks.us/fix-audio-sync-issue-in-obs/

Steps to Reproduce

1. Load the Sync Video as a Media source into OBS. Adjust the Canvas and Encoder settings to the video. 1080p, 60fps.
2. Start Recording, Stop Recording. Make several recordings.
3. Check and compare the A/V sync of the recordings in DaVinci Resolve or Premiere Pro.
4. In each recording the audio will be aligned differently. Sometimes too early sometimes too late and with different time shifts.
   ...

Anything else we should know?

No response

Start with the listed reproduction steps, the Sync Video media source, and the OBS log URL, then compare several recordings in DaVinci Resolve or Premiere Pro. Done means repeated recordings have consistent audio/video alignment so Sync Offset can correct a fixed shift.