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 ?
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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
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.
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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
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Filter was added in May '16. Get a current version of ffmpeg from ffmpeg.org/download.html – Gyan Jan 25 '17 at 8:56
