FFT-based FIR

kdenlive2304_effects-fft-based_fir

Description

This effect/filter applies arbitrary expressions to samples in frequency domain. It is a Finite Impulse Response (FIR)[1] filter using Fast Fourier Transform (FFT)[2].

Parameters

Parameter

Value

Description

Gain in Y / U / V plane

Integer

Set the gain value for the Y (luma), U (1st chroma) or V (2nd chroma) plane. Allowed values are 0 to 250, default is 0.

Luminance Y / U / V plane

Float

Set the frequency domain weight value for the Y (luma), U (1st chroma) or V (2nd chroma) plane. Allowed values are 0.000 to 5.000, default is 1.000.

Evaluate

Selection

Set when the expressions are evaluated.

The following selection items are available:

Evaluate

init

Only evaluate expressions once during filter initialization (default)

frame

Evaluate expressions for each incoming frame

Avertissement

If Evaluate is set to frame render times will be significantly longer as each frame is evaluated individually.