FFmpeg 3.0.12
Version Matrix Source
3.0.12 ❭ Filters ❭ Video ❭ fftfilt
Since* 2.7
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Apply arbitrary expressions to samples in frequency domain

dc_Y

Adjust the dc value (gain) of the luma plane of the image. The filter accepts an integer value in range 0 to 1000. The default value is set to 0.

dc_U

Adjust the dc value (gain) of the 1st chroma plane of the image. The filter accepts an integer value in range 0 to 1000. The default value is set to 0.

dc_V

Adjust the dc value (gain) of the 2nd chroma plane of the image. The filter accepts an integer value in range 0 to 1000. The default value is set to 0.

weight_Y

Set the frequency domain weight expression for the luma plane.

weight_U

Set the frequency domain weight expression for the 1st chroma plane.

weight_V

Set the frequency domain weight expression for the 2nd chroma plane.

The filter accepts the following variables:

X, Y

The coordinates of the current sample.

W, H

The width and height of the image.

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Examples

  • High-pass: 

    fftfilt=dc_Y=128:weight_Y='squish(1-(Y+X)/100)'

  • Low-pass: 

    fftfilt=dc_Y=0:weight_Y='squish((Y+X)/100-1)'

  • Sharpen: 

    fftfilt=dc_Y=0:weight_Y='1+squish(1-(Y+X)/100)'

  • Blur: 

    fftfilt=dc_Y=0:weight_Y='exp(-4 * ((Y+X)/(W+H)))'