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#!/bin/bash
# Transcode FLAC album to Opus, preserving metadata
# Usage: ./transcode_album.sh <source_dir> [--delete-source]
#
# Converts all FLAC files to Opus 128kbps (transparent quality, ~10x smaller)
# Preserves all metadata tags and album art
set -e
SOURCE_DIR="$1"
DELETE_SOURCE=false
BITRATE="128k"
GROUP="mediaserver"
if [[ "$2" == "--delete-source" ]]; then
DELETE_SOURCE=true
fi
if [[ -z "$SOURCE_DIR" ]] || [[ ! -d "$SOURCE_DIR" ]]; then
echo "Usage: $0 <source_directory> [--delete-source]"
exit 1
fi
# Count FLAC files
flac_count=$(find "$SOURCE_DIR" -maxdepth 1 -iname "*.flac" | wc -l)
if [[ $flac_count -eq 0 ]]; then
echo "No FLAC files found in $SOURCE_DIR"
exit 0
fi
echo "Transcoding $flac_count FLAC files to Opus ($BITRATE)..."
echo "Source: $SOURCE_DIR"
converted=0
failed=0
# Process each FLAC file
find "$SOURCE_DIR" -maxdepth 1 -iname "*.flac" | while read -r flac_file; do
filename=$(basename "$flac_file")
opus_file="${flac_file%.flac}.opus"
opus_file="${opus_file%.FLAC}.opus"
echo " Converting: $filename"
if ffmpeg -hide_banner -loglevel warning -i "$flac_file" \
-c:a libopus -b:a "$BITRATE" -vbr on \
-map_metadata 0 \
-y "$opus_file" 2>&1; then
# Preserve original timestamp
touch -r "$flac_file" "$opus_file"
# Fix permissions
chgrp "$GROUP" "$opus_file" 2>/dev/null || true
chmod 664 "$opus_file" 2>/dev/null || true
if $DELETE_SOURCE; then
rm "$flac_file"
echo " ✓ Converted and removed FLAC"
else
echo " ✓ Converted (FLAC kept)"
fi
((converted++)) || true
else
echo " ✗ Failed to convert"
((failed++)) || true
fi
done
# Also convert any MP3s that are suspiciously large (>15MB per file avg)
# Actually, skip this - MP3s are already compressed
# Handle cover art - keep it
# ffmpeg should copy embedded art automatically for opus
echo ""
echo "Done! Converted $converted files."
if $DELETE_SOURCE; then
# Calculate space saved
echo "FLAC files deleted to save space."
fi
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