Aphaser

Audio Single output Transform

Add a phasing effect to the audio.

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

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

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

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
in_gain	float	0.4	0–1	set input gain
out_gain	float	0.74	0–1000000000	set output gain
delay	float	3	0–5	set delay in milliseconds
decay	float	0.4	0–0.99	set decay
speed	float	0.5	0.1–2	set modulation speed
type	AphaserType	triangular	triangular, sinusoidal	set modulation type

---

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