Normalize .ogg audio files with the command line [duplicate]

I'm trying to normalize (and or compress) around 100 .ogg files which have audio level really too low.

I know that by hand I can use Audacity ... but that will be too much clicks! Instead I was looking for a tool which can be used in a small script (or with --recursive).

Just tried to look in man oggenc, man ffmpeg, with no success yet...

Thanks!

Solution 1:

Finally, I've found the package normalize-audio which provides the tool normalize-ogg. So I just had to run :

for audio_file in *.ogg; do
    normalize-ogg $audio_file;
done

Solution 2:

Vorbisgain will do the trick, the pendent of mp3gain

vorbisgain *.ogg