Stereowiden

Audio Single output Transform

Apply stereo widening effect.

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

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

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

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	20	1–100	set delay time
feedback	float	0.3	0–0.9	set feedback gain
crossfeed	float	0.3	0–0.8	set cross feed
drymix	float	0.8	0–1	set dry-mix

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