Sab

Video Single output Transform

Apply shape adaptive blur.

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

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

$result = $video->apply(new Sab(…));

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
luma_radius	float	1	0.1–4	set luma radius
luma_pre_filter_radius	float	1	0.1–2	set luma pre-filter radius
luma_strength	float	1	0.1–100	set luma strength
chroma_radius	float	-0.9	-0.9–4	set chroma radius
chroma_pre_filter_radius	float	-0.9	-0.9–2	set chroma pre-filter radius
chroma_strength	float	-0.9	-0.9–100	set chroma strength

FFmpeg also names these options (use the parameter shown above): lr → luma_radius, lpfr → luma_pre_filter_radius, ls → luma_strength, cr → chroma_radius, cpfr → chroma_pre_filter_radius, cs → chroma_strength.

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