Psnr

Video Single output Transform

Calculate the PSNR between two video streams.

FFmpeg filter: psnr — 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():

$node   = $video->addFilter(new Psnr(…), [$other]);
$result = $node->outputs()[0];

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

$result = $video->apply(new Psnr(…), $other);

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
stats_file	string	—	—	Set file where to store per-frame difference information
stats_version	int	1	1–2	Set the format version for the stats file.
output_max	bool	false	—	Add raw stats (max values) to the output log.

FFmpeg also names these options (use the parameter shown above): f → stats_file.

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