fftfilt


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.

'eval'

Set when the expressions are evaluated.

It accepts the following values:

'init'

Only evaluate expressions once during the filter initialization.

'frame'

Evaluate expressions for each incoming frame.

Default value is 'init'.

The filter accepts the following variables:

'X'
'Y'

The coordinates of the current sample.

'W'
'H'

The width and height of the image.

'N'

The number of input frame, starting from 0.