Sidechaingate

Audio Single output Transform

Audio sidechain gate.

FFmpeg filter: sidechaingate — the official reference.

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

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

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

$result = $audio->apply(new Sidechaingate(…), $other);

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
level_in	float	1	0.015625–64	set input level
mode	SidechaingateMode	downward	downward, upward	set mode
range	float	0.06125	0–1	set max gain reduction
threshold	float	0.125	0–1	set threshold
ratio	float	2	1–9000	set ratio
attack	float	20	0.01–9000	set attack
release	float	250	0.01–9000	set release
makeup	float	1	1–64	set makeup gain
knee	float	2.828427125	1–8	set knee
detection	SidechaingateDetection	rms	peak, rms	set detection
link	SidechaingateLink	average	average, maximum	set link
level_sc	float	1	0.015625–64	set sidechain gain

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