Apad

Audio Single output Transform

Pad audio with silence.

FFmpeg filter: apad — 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   = $audio->addFilter(new Apad(…));
$result = $node->outputs()[0];

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

$result = $audio->apply(new Apad(…));

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
packet_size	int	4096	≥ 0	set silence packet size
pad_len	int	-1	≥ -1	set number of samples of silence to add
whole_len	int	-1	≥ -1	set minimum target number of samples in the audio stream
pad_dur	int	-1	≥ -1	set duration of silence to add
whole_dur	int	-1	≥ -1	set minimum target duration in the audio stream

---

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