Cellauto

Video Single output Source

Create pattern generated by an elementary cellular automaton.

FFmpeg filter: cellauto — the official reference.

Generate a stream. Cellauto 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 Cellauto(…));

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
filename	string	—	—	read initial pattern from file
pattern	string	—	—	set initial pattern
rate	string	25	—	set video rate
size	string	—	—	set video size
rule	int	110	0–255	set rule
random_fill_ratio	float	0.61803398874989	0–1	set fill ratio for filling initial grid randomly
random_seed	int	-1	≥ -1	set the seed for filling the initial grid randomly
scroll	bool	true	—	scroll pattern downward
start_full	bool	false	—	start filling the whole video
stitch	bool	true	—	stitch boundaries

FFmpeg also names these options (use the parameter shown above): f → filename, p → pattern, r → rate, s → size, ratio → random_fill_ratio, seed → random_seed, full → start_full.

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