Thistogram

Video Single output Transform

Compute and draw a temporal histogram.

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

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

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

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
width	int	0	0–8192	set width
display_mode	ThistogramDisplayMode	stack	overlay, parade, stack	set display mode
levels_mode	ThistogramLevelsMode	linear	linear, logarithmic	set levels mode
components	int	7	1–15	set color components to display
bgopacity	float	0.9	0–1	set background opacity
envelope	bool	false	—	display envelope
ecolor	string	gold	—	set envelope color
slide	ThistogramSlide	replace	frame, replace, scroll, rscroll, picture	set slide mode

FFmpeg also names these options (use the parameter shown above): w → width, d → display_mode, m → levels_mode, c → components, b → bgopacity, e → envelope, ec → ecolor.

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