H.265 encoding very slow

I'm recording 1080p @ 60FPS via a usb 3.0 board level camera.
Using Ultra Fast setting on ffmpeg it took the RK3328 Renegade board 11 hours to encode 1.2GB of video using h.265 down to 692.1mb. According to the specs on librecomputer, it looks like the renegade has native h.265 encoding. Is there a way to encode h.265 on the fly while streaming?


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