---
name: "SReview::Normalizer"
section: "3pm"
platform: "linux"
package: "sreview-common"
version: "0.7.1-1"
release: "Debian 11 (Bullseye)"
platforms: ["linux"]
url: "https://new.carta.tech/SReview::Normalizer"
---

# SReview::Normalizer(3pm)

normalize the audio of a video asset.

## NAME

SReview::Normalizer - normalize the audio of a video asset.

## SYNOPSIS

```
  SReview::Normalizer->new(input => SReview::Video->new(...), output => SReview::Video->new(...))->run();
```

## DESCRIPTION

`"SReview::Normalizer"` is a class to normalize the audio of a given SReview::Video asset, using bs1770gain at its default settings.

It looks at the `"command_tune"` configuration parameter to decide whether to pass the `"--suffix"` option to bs1770gain: if the installed version of `"bs1770gain"` is at 0.5 or below, set the `"bs1770gain"` key of `"command_tune"` to 0.5 to remove the `"--suffix"` parameter from the command line (which is required for 0.6 or above, but not supported by 0.5 or below).

## ATTRIBUTES

The following attributes are supported by SReview::Normalizer.

### input

An SReview::Video object for which the audio should be normalized.

Required.

### output

An SReview::Video object that the normalized audio should be written to, together with the video from the input file.

Required. Must point to a .mkv file.

## METHODS

### run

Performs the normalization.