Placebo is sometimes placebo, depends on the individual setting, some are the same as very slow setting, those are not not placebo. there is also less random flickering and smoother playback, and color banding almost gone. these settings gives good blending when needed but not too much (like sao) thus preserving detail for high detail/high res encodes. sources with less grain/noise can have more detail by raising quality (lower crf value). also with little to no artifacts when blown up to large size). The idea is lower the quality (raise crf value) to increase blending thus removing static, noise, & artifacts (while attempting to retain as much detail as possible).
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