Erosion

Video Single output Transform

Apply erosion effect.

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

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

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

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
coordinates	int	255	0–255	set coordinates
threshold0	int	65535	0–65535	set threshold for 1st plane
threshold1	int	65535	0–65535	set threshold for 2nd plane
threshold2	int	65535	0–65535	set threshold for 3rd plane
threshold3	int	65535	0–65535	set threshold for 4th plane

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