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Higher CRF (Constant Rate Factor) reduces detail:
ffmpeg -i input.png -c:v libaom-av1 -still-picture 1 -crf 45 -b:v 0 -cpu-used 0 output.avif
Lossless:
ffmpeg -i input.png -c:v libaom-av1 -still-picture 1 -crf 0 -b:v 0 -cpu-used 0 output.avif