Broadcast-normalize audio files to EBU R128 (-16 LUFS, -1 dBTP, 48kHz) with silence trimming

broadcast-normalize-sfx.sh

#!/bin/bash
# broadcast-normalize-sfx.sh
# Normalize audio files to broadcast-ready levels (EBU R128)
# Strips leading silence, normalizes to -16 LUFS, limits peaks, resamples to 48kHz
#
# Usage: ./broadcast-normalize-sfx.sh <directory>
# Requires: ffmpeg

set -euo pipefail

DIR="${1:-.}"
cd "$DIR" || { echo "Error: cannot cd to $DIR"; exit 1; }

echo "Processing all .mp3 files in: $(pwd)"
echo "Target: -16 LUFS, -1 dBTP, 48kHz, leading silence removed, 200ms pad"
echo "---"

TOTAL=0
OK=0
FAIL=0

for f in *.mp3; do
  [ -f "$f" ] || continue
  TOTAL=$((TOTAL + 1))
  echo "[$TOTAL] $f"

  TMPFILE=$(mktemp /tmp/broadcast-norm-XXXXXX.mp3)

  if ffmpeg -i "$f" \
    -af "silenceremove=start_periods=1:start_duration=0:start_threshold=-40dB,loudnorm=I=-16:TP=-1:LRA=11,adelay=200|200" \
    -ar 48000 -y "$TMPFILE" 2>/dev/null; then
    mv "$TMPFILE" "$f"
    OK=$((OK + 1))
    echo "  -> done"
  else
    rm -f "$TMPFILE"
    FAIL=$((FAIL + 1))
    echo "  -> FAILED"
  fi
done

echo "---"
echo "Complete: $OK/$TOTAL succeeded, $FAIL failed"