Framerate

Video Single output Transform

Upsamples or downsamples progressive source between specified frame rates.

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

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

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

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
fps	string	50	—	required output frames per second rate
interp_start	int	15	0–255	point to start linear interpolation
interp_end	int	240	0–255	point to end linear interpolation
scene	float	8.2	0–100	scene change level
flags	int|string	1	—	set flags

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