3

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 ?

  • 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 Jan 25 '17 at 0:59
7

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.

  • I'm getting an error message No such filter: 'loudnorm', do I need to install it somehow? – Chen Kinnrot Jan 25 '17 at 8:06
  • Filter was added in May '16. Get a current version of ffmpeg from ffmpeg.org/download.html – Gyan Jan 25 '17 at 8:56

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.