Colorchart

Video Single output Source

Generate color checker chart.

FFmpeg filter: colorchart — the official reference.

Generate a stream. Colorchart 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 Colorchart(…));

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
rate	string	25	—	set video rate
duration	int	-1	≥ -1	set video duration
sar	string	—	—	set video sample aspect ratio
patch_size	string	64x64	—	set the single patch size
preset	ColorchartPreset	reference	reference, skintones	set the color checker chart preset

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

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