Xstack

Video Single output Transform

Stack video inputs into custom layout.

FFmpeg filter: xstack — 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   = $video->addFilter(new Xstack(…), [$other]);
$result = $node->outputs()[0];

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

$result = $video->apply(new Xstack(…), $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
inputs	int	2	≥ 2	set number of inputs
layout	string	—	—	set custom layout
grid	string	—	—	set fixed size grid layout
shortest	bool	false	—	force termination when the shortest input terminates
fill	string	none	—	set the color for unused pixels

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