Anlmf

Audio Single output Transform

Apply Normalized Least-Mean-Fourth algorithm to first audio stream.

FFmpeg filter: anlmf — 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   = $audio->addFilter(new Anlmf(…), [$other]);
$result = $node->outputs()[0];

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

$result = $audio->apply(new Anlmf(…), $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
order	int	256	1–32767	set the filter order
mu	float	0.75	0–2	set the filter mu
eps	float	1	0–1	set the filter eps
leakage	float	0	0–1	set the filter leakage
out_mode	AnlmfMode	o	i, d, o, n, e	set output mode
precision	AnlmfPrecision	auto	auto, float, double	set processing precision

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