Filter: avfilter.compand

Plugin Information

title: compand
media types: Audio
description: Compress or expand audio dynamic range.
version: Lavfi8.39.100
creator: libavfilter maintainers

Notes

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.

Parameters

av.attacks

description: set time over which increase of volume is determined
type: string
readonly: no
required: no
default: ‘0’

av.decays

description: set time over which decrease of volume is determined
type: string
readonly: no
required: no
default: ‘0.8’

av.points

description: set points of transfer function
type: string
readonly: no
required: no
default: ‘-70/-70|-60/-20|1/0’

av.soft-knee

description: set soft-knee
type: float
readonly: no
required: no
minimum: 0.01
maximum: 900
default: 0.01
format: double

av.gain

description: set output gain
type: float
readonly: no
required: no
minimum: -900
maximum: 900
default: 0
format: double

av.volume

description: set initial volume
type: float
readonly: no
required: no
minimum: -900
maximum: 0
default: 0
format: double

av.delay

description: set delay for samples before sending them to volume adjuster
type: float
readonly: no
required: no
minimum: 0
maximum: 20
default: 0
format: double

position

description: The MLT position value to set on avfilter frames
type: string
readonly: no
required: no
default: frame
values:

  • frame
  • filter
  • source
  • producer

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