Question / Help OBS Recordings jittery but used to work fine. Pls Halp!

I've been trying to record on OBS but the video keeps coming out jittery. Not the game itself, the actual video. When im recording it, the preview isn't jittery at all. this only happens when I try to play Minecraft. When I'm not using it, it works fine. Something else odd, is that it was working fine last time I used it. Hope somone can help me. No one on the rest of the internet seem to know.
 
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