I looked at the FFmpeg page for AV1 here.
But there is sadly no info from what I could see about the scale of quality for AV1 in CRF. Shotcut’s preset sets the CRF at 45 which I suppose is the “High Quality” equivalent of H.264’s High Quality CRF of 23.
So at CRF for AV1 does it start hitting visual lossless quality?
Also, does AV1 respond to if you bump the Interpolation up to Bicubic for best results?