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audio level check with ffmpeg

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Jay Gustafson
audio level check with ffmpeg
on Jan 27, 2012 at 5:23:21 pm

I'm looking to write a script that will check the audio mic level of my mpeg recordings. If there a way to have ffmpeg report the audio level (in dB for example)on a frame-by-frame basis so my script can verify the audio level?


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Michael Rampe
Re: audio level check with ffmpeg
on Jan 30, 2012 at 10:19:49 pm

I use SoX for this operation.
http://sox.sourceforge.net/

A command like:
$ sox $INPUT -n stats 2> stats.txt

...will give you a lot of useful data. I found that you get quite inaccurate results on some recordings due to subsonic non-vocal frequencies.

You can also use SoX to filter these out such as:
$ sox $INPUT -n -D highpass 100 stats 2> stats.txt

Let me know if this helps.

Michael


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