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Using FFmpeg to split mp3 audiobook file into mp3 parts based on audio volume level
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#!/bin/bash | |
IN="$1" | |
MIN_DUR_MINS="${2:-30}" | |
MIN_PART_DURATION_SECS=$(($MIN_DUR_MINS * 60)) | |
IN_PATH=`realpath "$1"` | |
DEFAULT_OUTDIR="$(dirname "$IN_PATH")/parts" | |
OUTDIR="${3:-$DEFAULT_OUTDIR}" | |
OUTFILE_PATTERN="${OUTDIR}/part-%03d.mp3" | |
true ${SD_PARAMS:="-55dB:d=0.3"}; | |
export MIN_PART_DURATION_SECS | |
echo "Determining split points..." >& 2 | |
SPLITS=$( | |
ffmpeg -v warning -i "$IN" -af silencedetect="$SD_PARAMS",ametadata=mode=print:file=-:key=lavfi.silence_start -vn -sn -f s16le -y /dev/null \ | |
| grep lavfi.silence_start= \ | |
| cut -f 2-2 -d= \ | |
| perl -ne ' | |
our $prev; | |
INIT { $prev = 0.0; } | |
chomp; | |
if (($_ - $prev) >= $ENV{MIN_PART_DURATION_SECS}) { | |
print "$_,"; | |
$prev = $_; | |
} | |
' \ | |
| sed 's!,$!!' | |
) | |
echo "Splitting points are $SPLITS" | |
mkdir -p "$OUTDIR" | |
echo "Saving ${MIN_DUR_MINS} min parts to ${OUTDIR}" | |
ffmpeg -v warning -i "$IN" -c copy -map 0 -f segment -segment_times "$SPLITS" "$OUTFILE_PATTERN" |
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