UnixTools/mp3gain_tracks.sh

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#!/bin/sh
# Install mp3gain from https://launchpad.net/~flexiondotorg/+archive/ubuntu/audio
if [ "$#" = "0" ]; then
echo "Usage: $0 file1 [file2 file3 ... fileN]"
echo "(Needs package python-rgain to be installed!)"
exit 1
fi
if [ -z "$CONCURRENCY_LEVEL" ]; then
CONCURRENCY_LEVEL=1
fi
echo "Processing using $CONCURRENCY_LEVEL processes..."
# -q - Quiet mode: no status messages
# -k - automatically lower Track/Album gain to not clip audio
# -p - Preserve original file timestamp
# -r - apply Track gain automatically (all files set to equal loudness)
# -s i - use ID3v2 tag for MP3 gain info
# -d <n> - modify suggested dB gain (89dB) by floating-point n
nice -n2 find "$@" -print0 | xargs -0 -P $CONCURRENCY_LEVEL -n 1 -I {} mp3gain -q -k -p -r -s i -d 4.0 "{}"
#nice -n2 find "$@" -print0 | xargs -0 -P $CONCURRENCY_LEVEL -n 1 -I {} replaygain --no-album "{}"
echo "All done."