Sierpinski

Video Single output Source

Render a Sierpinski fractal.

FFmpeg filter: sierpinski — the official reference.

Generate a stream. Sierpinski is a source — it has no input, so you create a stream from it rather than applying it to one:

$video = \FFmpeg\VideoStream::generate(new Sierpinski(…));

apply() and addFilter() do not apply to source filters (there is nothing to attach them to).

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
size	string	640x480	—	set frame size
rate	string	25	—	set frame rate
seed	int	-1	≥ -1	set the seed
jump	int	100	1–10000	set the jump
type	SierpinskiType	carpet	carpet, triangle	set fractal type

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

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