Answers.Body: <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>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-01-25T08:06:44.517Z
Answers.Text: I'm getting an error message No such filter: 'loudnorm', do I need to install it somehow?
Answers.UserDisplayName: Chen Kinnrot
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-01-25T08:56:15.707Z
Answers.Text: Filter was added in May '16. Get a current version of ffmpeg from http://ffmpeg.org/download.html
Answers.UserDisplayName: Gyan
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-01-24T19:56:08.090Z
Answers.LastActivityDate: 2017-01-24T19:56:08.090Z
Answers.UserDisplayName: Gyan
Body: <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>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-01-25T00:59:11.740Z
Comments.Text: 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.
Comments.UserDisplayName: Michael Liebman
Tags: <ffmpeg><audio><broadcasting><loudness>
Title: Loudness control LUFS level adjustments
UserDisplayName: Chen Kinnrot
ThreadText: # 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.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_2 on 2017-01-24. Score: 8 | Accepted answer
  
  FFmpeg's [loudnorm](https://ffmpeg.org/ffmpeg-filters.html#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](https://ffmpeg.org/ffmpeg-filters.html#ebur128-1) 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  
  
  ---
  
  