/usr/share/mlt/normalize/filter_volume.yml is in libmlt-data 0.9.0-3.
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: 1
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.
- 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.
mutable: yes
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