Volume

Audio Single output Transform

Change input volume.

FFmpeg filter: volume — the official reference.

Add it to a graph. The explicit form works for every filter — bind it to its input and read the result from outputs():

$node   = $audio->addFilter(new Volume(…));
$result = $node->outputs()[0];

Shorthand. Single-output filters can skip the node — apply() returns the result stream directly:

$result = $audio->apply(new Volume(…));

When to use it

TODO — when this filter shines: what it’s the right tool for, what to reach for instead when it isn’t, and how it composes with neighbouring filters.

How to use it

TODO — prose: how the filter actually works and what its key parameters mean (the explanation FFmpeg’s terse option help omits).

Examples

TODO — runnable PHP, with the equivalent ffmpeg CLI alongside.

Gotchas

TODO

See also

TODO

Parameters

Parameter	Type	Default	Range / values	Description
volume	int|float|string	1.0	expression	set volume adjustment expression
precision	VolumePrecision	float	fixed, float, double	select mathematical precision
eval	VolumeEval	once	once, frame	specify when to evaluate expressions
replaygain	VolumeReplaygain	drop	drop, ignore, track, album	Apply replaygain side data when present
replaygain_preamp	float	0	-15–15	Apply replaygain pre-amplification
replaygain_noclip	bool	true	—	Apply replaygain clipping prevention

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Maps to FFmpeg’s volume filter. Verified against ffmpeg n7.1.1.