Flanger

Audio Single output Transform

Apply a flanging effect to the audio.

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

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

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

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
delay	float	0	0–30	base delay in milliseconds
depth	float	2	0–10	added swept delay in milliseconds
regen	float	0	-95–95	percentage regeneration (delayed signal feedback)
width	float	71	0–100	percentage of delayed signal mixed with original
speed	float	0.5	0.1–10	sweeps per second (Hz)
shape	FlangerType	sinusoidal	triangular, sinusoidal	swept wave shape
phase	float	25	0–100	swept wave percentage phase-shift for multi-channel
interp	FlangerItype	linear	linear, quadratic	delay-line interpolation

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