Mandelbrot

Video Single output Source

Render a Mandelbrot fractal.

FFmpeg filter: mandelbrot — the official reference.

Generate a stream. Mandelbrot 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 Mandelbrot(…));

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
maxiter	int	7189	≥ 1	set max iterations number
start_x	float	-0.74364388703716	-100–100	set the initial x position
start_y	float	-0.13182590420531	-100–100	set the initial y position
start_scale	float	3	≥ 0	set the initial scale value
end_scale	float	0.3	≥ 0	set the terminal scale value
end_pts	float	400	≥ 0	set the terminal pts value
bailout	float	10	≥ 0	set the bailout value
morphxf	float	0.01	—	set morph x frequency
morphyf	float	0.0123	—	set morph y frequency
morphamp	float	0	—	set morph amplitude
outer	MandelbrotOuter	normalized_iteration_count	iteration_count, normalized_iteration_count, white, outz	set outer coloring mode
inner	MandelbrotInner	mincol	black, period, convergence, mincol	set inner coloring mode

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

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