Streamselect

Video Multiple outputs Transform

Select video streams

FFmpeg filter: streamselect — 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 = $video->addFilter(new Streamselect(…), [$other])->outputs(); // one stream per output pad

Shorthand. Not available — apply() returns a single stream, and Streamselect 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

---

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