i'd love it for CBR stuff. it'd be easier to implement i think - if quant=1 and bitrate < target, then multiply matrix by some calculated number (based on compressibility stuff i have no idea about, and also a ratio of current bitrate and target bitrate), then round to integers. this wont affect the "shape" of the matrix much (rounding excluded), but will allow quant 1 to keep more detail.
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