Rotate camera image

Basic Information:

Printer Model: Ender 3 pro
MCU: SKR 1.4 Turbo
Host: BTT Pi 1.2

I use crowsnest to stream my cameras images.
Is it possible to rotate camera image to crop black fields of it?
I try v4l2loopback and ffmpeg:

ffmpeg -re -i /dev/video2 -pix_fmt yuyv422 -video_size 1920x1080 -framerate 30 -vf “transpose=1” -f v4l2 /dev/video4

It works well but i have low framerate and high system load.