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max dimensions this basketweaving forum allows. Should be okay as far as I can tell.
VMAF 93 with minimums at 82. Two-Pass with -an -vf "scale=-1:2048" -c:v libvpx-vp9 -row-mt 1 -threads 0 -deadline best -pix_fmt yuv420p10le -crf 20 -b:v 741k