<p>FFmpeg's <a href="https://ffmpeg.org/ffmpeg-filters.html#loudnorm" rel="noreferrer">loudnorm</a> filter can be used. Basic syntax is</p>

<pre><code>ffmpeg -i in.mp4 -c:v copy -af loudnorm=I=-23:LRA=1 -ar 48000 out.mp4
</code></pre>

<p>The loudness range (LRA) should be <code>2 x max deviation</code>.</p>

<p>Also see the <a href="https://ffmpeg.org/ffmpeg-filters.html#ebur128-1" rel="noreferrer">ebur128</a> filter for measuring loudness.</p>

CC BY-SA 3.0
2017-01-25T08:06:44.517Z
I'm getting an error message No such filter: 'loudnorm', do I need to install it somehow?
Chen Kinnrot
CC BY-SA 3.0
2017-01-25T08:56:15.707Z
Filter was added in May '16. Get a current version of ffmpeg from http://ffmpeg.org/download.html
Gyan
CC BY-SA 3.0
2017-01-24T19:56:08.090Z
2017-01-24T19:56:08.090Z
Gyan
<p>Is there a tool that can adjust the loudness level of a video? </p>

<p>for example I need to make the loudness to be -23 LUFS with max deviation of 0.5 lu.</p>

<p>is there a simple tool/cloud service that doesn't cost too much, that can do this ? </p>

CC BY-SA 3.0
2017-01-25T00:59:11.740Z
Be careful. Depending on the length of the asset and the content, you may not want to use a tool that dynamically adjusts to target loudness over the course of the asset. If you are dealing with long assets (>2 minutes) and/or you own the content, then adjusting like that is fine. However, with short assets or when you are only playing back someone else's content, like commercials on a TV station, you should only do a simple level shift (linear normalization) to meet your target loudness.
Michael Liebman
<ffmpeg><audio><broadcasting><loudness>
Loudness control LUFS level adjustments
Chen Kinnrot
# Loudness control LUFS level adjustments

(Asked by: username_0 on 2017-01-24)

Is there a tool that can adjust the loudness level of a video?

for example I need to make the loudness to be -23 LUFS with max deviation of 0.5 lu.

is there a simple tool/cloud service that doesn't cost too much, that can do this ?

**Tags:** ffmpeg, audio, broadcasting, loudness

> **Comments:**
> **username_1**: Be careful. Depending on the length of the asset and the content, you may not want to use a tool that dynamically adjusts to target loudness over the course of the asset. If you are dealing with long assets (>2 minutes) and/or you own the content, then adjusting like that is fine. However, with short assets or when you are only playing back someone else's content, like commercials on a TV station, you should only do a simple level shift (linear normalization) to meet your target loudness.  

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## 1 answers

### Answer by username_2 on 2017-01-24. Score: 8 | Accepted answer

FFmpeg's loudnorm filter can be used. Basic syntax is
ffmpeg -i in.mp4 -c:v copy -af loudnorm=I=-23:LRA=1 -ar 48000 out.mp4

The loudness range (LRA) should be 2 x max deviation.
Also see the ebur128 filter for measuring loudness.

> **Comments:**
> **username_0**: I'm getting an error message No such filter: 'loudnorm', do I need to install it somehow?  
> **username_2**: Filter was added in May '16. Get a current version of ffmpeg from http://ffmpeg.org/download.html  

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