Astreamselect

Audio Multiple outputs Transform

Select audio streams

FFmpeg filter: astreamselect — 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():

$outputs = $audio->addFilter(new Astreamselect(…), [$other])->outputs(); // one stream per output pad

Shorthand. Not available — apply() returns a single stream, and Astreamselect has multiple outputs. Use addFilter() + outputs() above.

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	number of input streams
map	string	—	—	input indexes to remap to outputs

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