Fade

Video Single output Transform

Fade in/out input video.

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

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

$result = $video->apply(new Fade(…));

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
type	FadeType	in	in, out	set the fade direction
start_frame	int	0	≥ 0	Number of the first frame to which to apply the effect.
nb_frames	int	25	≥ 1	Number of frames to which the effect should be applied.
alpha	bool	false	—	fade alpha if it is available on the input
start_time	int	0	≥ 0	Number of seconds of the beginning of the effect.
duration	int	0	≥ 0	Duration of the effect in seconds.
color	string	black	—	set color

FFmpeg also names these options (use the parameter shown above): t → type, s → start_frame, n → nb_frames, st → start_time, d → duration, c → color.

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