title: afftfilt
media types:
Audio
description: Apply arbitrary expressions to samples in frequency domain.
version: Lavfi9.12.100
creator: libavfilter maintainers
Many parameters support animated values (keyframes) but only the numeric ones. Many numeric properties have type string because they accept an expression (see FFmpeg documentation) even though they evaluate to a numeric value.
description:
set channels real expressions
type: string
readonly: no
required: no
default: ‘re’
description:
set channels imaginary expressions
type: string
readonly: no
required: no
default: ‘im’
description:
set window size
type: integer
readonly: no
required: no
minimum: 16
maximum: 131072
default: 4096
description:
set window function
type: string
readonly: no
required: no
format: integer or keyword
values:
description:
set window overlap
type: float
readonly: no
required: no
minimum: 0
maximum: 1
default: 0.75
description:
Maximum number of threads
type: integer
readonly: no
required: no
minimum: 0
default: 0
description:
The MLT position value to set on avfilter frames
type: string
readonly: no
required: no
default: frame
values:
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