RoughDraft

Extension/AudioFrequencyExpression.RoughDraft.Extension.ps1

Synopsis

Apply expressions to audio frequencies

Description

Apply arbitrary expressions to samples in frequency domain.

https://ffmpeg.org/ffmpeg-filters.html#afftfilt

Examples

EXAMPLE 1

Edit-Media .\a.mp3 -FrequencyExpression -FrequencyExpressionReal "hypot(re,im)*sin(0)" -FrequencyExpressionImaginary "hypot(re,im)*cos(0)" -FrequencyExpressionWindowSize 512 -FrequencyExpressionOverlap 0.75

Parameters

FrequencyExpression

Apply arbitrary expressions to samples in frequency domain.

Type	Required	Position	PipelineInput
`[Switch]`	true	named	false

FrequencyExpressionReal

Set channels real expressions.

Each expression in real and imag can contain the following constants and functions:

Value	Description
sr	sample rate
b	current frequency bin number
nb	number of available bins
ch	channel number of the current expression
chs	number of channels
pts	current frame pts
re	current real part of frequency bin of current channel
im	current imaginary part of frequency bin of current channel
real(b, ch)	Return the value of real part of frequency bin at location (bin,channel)
imag(b, ch)	Return the value of imaginary part of frequency bin at location (bin,channel)

Type	Required	Position	PipelineInput	Aliases
`[String[]]`	false	1	false	afftfilt_real

FrequencyExpressionImaginary

Set channels imaginary expressions.

Each expression in real and imag can contain the following constants and functions:

Value	Description
sr	sample rate
b	current frequency bin number
nb	number of available bins
ch	channel number of the current expression
chs	number of channels
pts	current frame pts
re	current real part of frequency bin of current channel
im	current imaginary part of frequency bin of current channel
real(b, ch)	Return the value of real part of frequency bin at location (bin,channel)
imag(b, ch)	Return the value of imaginary part of frequency bin at location (bin,channel)

Type	Required	Position	PipelineInput	Aliases
`[String[]]`	false	2	false	afftfilt_imag

FrequencyExpressionWindowSize

set window size

Type	Required	Position	PipelineInput	Aliases
`[Int32]`	false	3	false	afftfilt_win_size

FrequencyExpressionWindowFunction

set window function

Valid Values:

rect
bartlett
hann
hanning
hamming
blackman
welch
flattop
bharris
bnuttall
bhann
sine
nuttall
lanczos
gauss’tukey
dolph
cauchy
parzen
poisson
bohman
kaiser

Type	Required	Position	PipelineInput	Aliases
`[Object]`	false	4	false	afftfilt_win_func

FrequencyExpressionOverlap

set window overlap

Type	Required	Position	PipelineInput	Aliases
`[Single]`	false	5	false	afftfilt_overlap

Syntax

Extension/AudioFrequencyExpression.RoughDraft.Extension.ps1 -FrequencyExpression [[-FrequencyExpressionReal] <String[]>] [[-FrequencyExpressionImaginary] <String[]>] [[-FrequencyExpressionWindowSize] <Int32>] [[-FrequencyExpressionWindowFunction] <Object>] [[-FrequencyExpressionOverlap] <Single>] [<CommonParameters>]

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