Hi jp, audio volume gets normalized automatically to 0.25 of the allowed maximum amplitude, which should make any wishes to further increase volume obsolete, but if you wish you can tweak that by using the special command "switch" and entering "-af volnorm=2:0.7" (with 1.0 it would start clipping too easily).
Cropping is done by overscanning (see help 2.3), sharpen/bright/etc are special commands and get explained in the help as well (invoke by entering "?")
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