Dynaudnorm

Audio Single output Transform

Dynamic Audio Normalizer.

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

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

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

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
framelen	int	500	10–8000	set the frame length in msec
gausssize	int	31	3–301	set the filter size
peak	float	0.95	0–1	set the peak value
maxgain	float	10	1–100	set the max amplification
targetrms	float	0	0–1	set the target RMS
coupling	bool	true	—	set channel coupling
correctdc	bool	false	—	set DC correction
altboundary	bool	false	—	set alternative boundary mode
compress	float	0	0–30	set the compress factor
threshold	float	0	0–1	set the threshold value
channels	string	all	—	set channels to filter
overlap	float	0	0–1	set the frame overlap
curve	string	—	—	set the custom peak mapping curve

FFmpeg also names these options (use the parameter shown above): f → framelen, g → gausssize, p → peak, m → maxgain, r → targetrms, n → coupling, c → correctdc, b → altboundary, s → compress, t → threshold, h → channels, o → overlap, v → curve.

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