Showvolume

Audio Video Single output Transform

Convert input audio volume to video output.

FFmpeg filter: showvolume — 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   = $video->addFilter(new Showvolume(…));
$result = $node->outputs()[0];

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

$result = $video->apply(new Showvolume(…));

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
rate	string	25	—	set video rate
b	int	1	0–5	set border width
w	int	400	80–8192	set channel width
h	int	20	1–900	set channel height
f	float	0.95	0–1	set fade
c	string	PEAK*255+floor((1-PEAK)*255)*256+0xff000000	—	set volume color expression
t	bool	true	—	display channel names
v	bool	true	—	display volume value
dm	float	0	0–9000	duration for max value display
dmc	string	orange	—	set color of the max value line
o	ShowvolumeOrientation	h	h, v	set orientation
s	int	0	0–5	set step size
p	float	0	0–1	set background opacity
m	ShowvolumeMode	p	p, r	set mode
ds	ShowvolumeDisplayScale	lin	lin, log	set display scale

FFmpeg also names these options (use the parameter shown above): r → rate.

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