Spectrumsynth

Video Audio Single output Transform

Convert input spectrum videos to audio output.

FFmpeg filter: spectrumsynth — the official reference.

Add it to a graph. The explicit form works for every filter — bind it to its inputs and read the result from outputs():

$node   = $video->addFilter(new Spectrumsynth(…), [$other]);
$result = $node->outputs()[0];

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

$result = $video->apply(new Spectrumsynth(…), $other);

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
sample_rate	int	44100	≥ 15	set sample rate
channels	int	1	1–8	set channels
scale	SpectrumsynthScale	log	lin, log	set input amplitude scale
slide	SpectrumsynthSlide	fullframe	replace, scroll, fullframe, rscroll	set input sliding mode
win_func	SpectrumsynthWinFunc	rect	rect, bartlett, hanning, hamming, blackman, welch, flattop, bharris, …	set window function
overlap	float	1	0–1	set window overlap
orientation	SpectrumsynthOrientation	vertical	vertical, horizontal	set orientation

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