replay bufer

I have been trying to use the replay buffer, with these recording settings: Recording Format: mkv Encoder: x264 Rate Control: CRF CRF: 14 Keyframe Interval: 0 CPU Usage Preset: veryfast However, it doesn't even save the clip in the first place. Before, i had used CBR as my Rate Control setting...

at some days i run the replay buffer in the background for multiple hours and somtimes it just stops responding, meaning its not saving any replays and when i try to stop the replay buffer the butten will say: "stopping replay buffer..." and stay like this. while that obs is slowly claiming more...