Having similar experiences today on apple silicon. For me the reproduction steps are:
- Open OBS
- Start Virtual Camera
- Expand "Reactions" from the menu bar icon
- Select any Reaction.
- The reaction will start to play and eventually freeze.
Occasionally the full reaction will play through without issue, but without fail, the video will freeze if I click through multiple reactions. The OBS UI still seems responsive though, and I can press the exit button to quit the program.
Maybe also useful to know I'm using a CamLink 4k, though my video settings are at 1080p