Comment 1 for bug 481597

confirmed on quantal on 2:1.0~rc4.dfsg1+

e.g. mplayer -vf hue=10:-20 SAM_0674.MP4 gives

The saturation option must be >= -10.000000: -20

and the man page still says:

       hue[=hue:saturation]
              Software equalizer with interactive controls just like the hardware equalizer, for cards/drivers
              that do not support hue and saturation controls in hardware.
                 <-180-180>
                      initial hue (default: 0.0)
                 <-100-100>
                      initial saturation, where negative values result in a negative chroma (default: 1.0)