Expected Behavior

This flag enables B-frames as reference and it should improve picture quality. It's basically b-pyramid from x264.

Current Behavior

When -b_ref_mode 2 is enabled my recording starts and after 2 seconds drop's bitrate to zero. If I try to stop recording, ui button just freezes and I have to kill obs process.

Steps to Reproduce

1. I'm using Xaymar's plugin for FFmpeg Nvenc that includes all the flags with easy to use UI.
2. https://obsproject.com/forum/resources/ffmpeg-encoders-for-obs-studio.826/
3. After installing just select the encoder in OBS Output
   
4. You can leave everything at default and just enable this option
   

Additional information

Enabling this flag -b_ref_mode 2 in Custom Output (FFmpeg)
should result in the same bug.