Mpdecimate

Video Single output Transform

Remove near-duplicate frames.

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

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

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

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
max	int	0	—	set the maximum number of consecutive dropped frames (positive), or the minimum interval between dropped frames (negative)
keep	int	0	≥ 0	set the number of similar consecutive frames to be kept before starting to drop similar frames
hi	int	768	—	set high dropping threshold
lo	int	320	—	set low dropping threshold
frac	float	0.33	0–1	set fraction dropping threshold

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