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gradfun: add notice from the MPlayer manual
Add notice telling that the filter is designed for playback only.
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@ -585,6 +585,10 @@ regions by truncation to 8bit colordepth.
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Interpolate the gradients that should go where the bands are, and
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dither them.
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This filter is designed for playback only. Do not use it prior to
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lossy compression, because compression tends to lose the dither and
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bring back the bands.
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The filter takes two optional parameters, separated by ':':
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@var{strength}:@var{radius}
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