[fritsch]

Can you check the temperature? (sensors) - also make sure that scaling is set to bilinear, cause all the NUCs are on average too slow to properly handle 4k (be it 4k input or even 1080p to 4k output) with the Lanczos or better scalers.

Edit: Btw. turn off component logging - nobody can read through all the ffmpeg clibber :-)