Signature

Video Single output Transform

Calculate the MPEG-7 video signature

FFmpeg filter: signature — the official reference.

Add it to a graph. The explicit form works for every filter — bind it to its inputs and read the result from outputs():

$node   = $video->addFilter(new Signature(…), [$other]);
$result = $node->outputs()[0];

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

$result = $video->apply(new Signature(…), $other);

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
detectmode	SignatureMode	off	off, full, fast	set the detectmode
nb_inputs	int	1	≥ 1	number of inputs
filename	string	—	—	filename for output files
format	SignatureFormat	binary	binary, xml	set output format
th_d	int	9000	≥ 1	threshold to detect one word as similar
th_dc	int	60000	≥ 1	threshold to detect all words as similar
th_xh	int	116	≥ 1	threshold to detect frames as similar
th_di	int	0	≥ 0	minimum length of matching sequence in frames
th_it	float	0.5	0–1	threshold for relation of good to all frames

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