Alimiter

Audio Single output Transform

Audio lookahead limiter.

FFmpeg filter: alimiter — 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 Alimiter(…));
$result = $node->outputs()[0];

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

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

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
level_out	float	1	0.015625–64	set output level
limit	float	1	0.0625–1	set limit
attack	float	5	0.1–80	set attack
release	float	50	1–8000	set release
asc	bool	false	—	enable asc
asc_level	float	0.5	0–1	set asc level
level	bool	true	—	auto level
latency	bool	false	—	compensate delay

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