Getting "Encoder overloaded" when using MKV. MP4 works fine. Help?

[udqwbhrgwu93ryt]

I am recording 2k video at High quality, Medium file siz and 60fps, however when I use MKV for it, it overloads the encoder. Help?
logs: https://obsproject.com/logs/EnEC5gi0h16dwif3

 

[udqwbhrgwu93ryt]

But I have a bitrate

 

[carlmmii]

Change your recording destination to a different drive. You're most likely encountering a disk I/O bottleneck which is causing the encoding lag.

 

[FerretBomb]

use Constant Bitrate

13:35:07.116: bitrate: 0 <- ???? set a bitrate !!!!!

This is bad advice. You should NOT use CBR for local recording. Preferably, use CQP or CRF (depending on which your chosen encoder uses).
CBR is the worst option, but necessary for video livestreaming due to how the replication and delivery infrastructure works. VBR is slightly better, but not by much.
CQP/CRF uses image-quality targets while encoding, in situations where network throughput is not the main bottleneck.