| set -euo pipefail | |
| if [ $# -lt 1 ]; then | |
| echo "Usage: $0 <audio_root_dir>" | |
| exit 1 | |
| fi | |
| ROOT="$1" | |
| find "$ROOT" -type f \( -iname "*.wav" -o -iname "*.mp3" -o -iname "*.m4a" -o -iname "*.mp4" \) | while IFS= read -r f; do | |
| [ -e "$f" ] || continue | |
| outf="${f%.*}.16k.wav" | |
| if [ -f "$outf" ]; then | |
| continue | |
| fi | |
| ffmpeg -hide_banner -loglevel error -y -i "$f" -ac 1 -ar 16000 -af loudnorm "$outf" || { | |
| echo "Failed to normalize: $f" >&2 | |
| } | |
| done | |
| echo "Normalization complete." | |