/usr/share/mlt/normalize/filter_volume.yml is in libmlt-data 0.9.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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type: filter
identifier: volume
title: Volume
version: 2
copyright: Ushodaya Enterprises Limited
creator: Dan Denneedy
license: GPLv2
language: en
tags:
- Audio
description: >
Adjust an audio stream's volume level. This filter is based on the
'normalize' utility
parameters:
- identifier: argument
title: Gain
type: string
description: >
The gain may be indicated as a floating point value of the gain
adjustment.
The gain may also be indicated as a numeric value with the suffix "dB"
to adjust in terms of decibels.
The gain may also be set to "normalise" to normalise the volume to the
target amplitude -12dBFS.
This value is discarded if value for property "level" is set.
- identifier: window
title: Window
type: integer
description: >
The number of video frames over which to smooth normalisation.
default: 75
mutable: yes
- identifier: normalise
title: Normalise
type: string
description: >
Normalise the volume to the specified amplitude.
The normalization may be indicated as a floating point value of the
relative volume.
The normalisation may also be indicated as a numeric value with the
suffix "dB" to set the amplitude in decibels.
default: -12dBFS
mutable: yes
- identifier: limiter
title: Limiter
type: string
description: >
Limit all samples above the specified amplitude.
The limiting may be indicated as a floating point value of the
relative volume.
The limiting may also be indicated as a numeric value with the suffix
"dB" to set the limiting amplitude in decibels.
default: -6dBFS
mutable: yes
- identifier: max_gain
title: Max gain
type: string
description: >
A floating point or decibel value of the maximum gain that can be
applied during normalisation.
default: 20dB
mutable: yes
- identifier: end
title: End gain
type: string
description: >
A gain value just like the Gain property. This causes the gain to be
interpolated from 'gain' to 'end' over the duration.
This value is discarded if value for property "level" is set.
mutable: yes
- identifier: max_gain
title: Max gain
type: string
description: >
A floating point or decibel value of the maximum gain that can be
applied during normalisation.
default: 20dB
mutable: yes
- identifier: level
title: Level
type: float
description: >
The animated floating point value of the gain
adjustment. Properties "gain" and "end" are discarded if this is set.
mutable: yes
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