add opus compression

flac-opus-compressing.sh

@@ -0,0 +1,309 @@
+#!/bin/bash
+
+# Media Library FLAC to Opus Conversion Script
+# Processes multiple albums in a media library, converting all FLAC files to Opus 448kbps
+
+# Check if ffmpeg is installed
+if ! command -v ffmpeg &> /dev/null; then
+    echo "Error: ffmpeg is not installed or not in PATH"
+    exit 1
+fi
+
+# Check if ffmpeg has opus encoder support
+if ! ffmpeg -encoders 2>/dev/null | grep -q "libopus"; then
+    echo "Error: ffmpeg does not have Opus encoder support (libopus)"
+    echo "Please install ffmpeg with Opus support"
+    exit 1
+fi
+
+# Function to display usage
+show_usage() {
+    echo "Usage: $0 [OPTIONS] <media_library_path>"
+    echo ""
+    echo "Options:"
+    echo "  -o, --output DIR     Output directory (default: creates _opus suffix)"
+    echo "  -r, --replace        Replace original files with Opus (use with caution)"
+    echo "  -p, --preserve       Create Opus files alongside original FLAC files"
+    echo "  -t, --test           Test mode - show what would be processed"
+    echo "  -f, --force          Force re-conversion of existing Opus files"
+    echo "  -b, --bitrate RATE   Opus bitrate in kbps (default: 448)"
+    echo "  -h, --help           Show this help message"
+    echo ""
+    echo "Examples:"
+    echo "  $0 /path/to/music/library"
+    echo "  $0 -o /path/to/output /path/to/music/library"
+    echo "  $0 --test /path/to/music/library"
+    echo "  $0 --replace /path/to/music/library"
+    echo "  $0 -b 384 /path/to/music/library"
+}
+
+# Default options
+OUTPUT_DIR=""
+REPLACE_MODE=false
+PRESERVE_MODE=false
+TEST_MODE=false
+FORCE_MODE=false
+OPUS_BITRATE=448
+PROCESSED_COUNT=0
+SKIPPED_COUNT=0
+ERROR_COUNT=0
+
+# Parse command line arguments
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        -o|--output)
+            OUTPUT_DIR="$2"
+            shift 2
+            ;;
+        -r|--replace)
+            REPLACE_MODE=true
+            shift
+            ;;
+        -p|--preserve)
+            PRESERVE_MODE=true
+            shift
+            ;;
+        -t|--test)
+            TEST_MODE=true
+            shift
+            ;;
+        -f|--force)
+            FORCE_MODE=true
+            shift
+            ;;
+        -b|--bitrate)
+            OPUS_BITRATE="$2"
+            shift 2
+            ;;
+        -h|--help)
+            show_usage
+            exit 0
+            ;;
+        -*)
+            echo "Unknown option: $1"
+            show_usage
+            exit 1
+            ;;
+        *)
+            MEDIA_LIBRARY="$1"
+            shift
+            ;;
+    esac
+done
+
+# Validate bitrate
+if ! [[ "$OPUS_BITRATE" =~ ^[0-9]+$ ]] || [ "$OPUS_BITRATE" -lt 64 ] || [ "$OPUS_BITRATE" -gt 512 ]; then
+    echo "Error: Invalid bitrate '$OPUS_BITRATE'. Must be between 64 and 512 kbps"
+    exit 1
+fi
+
+# Check if media library path is provided
+if [ -z "$MEDIA_LIBRARY" ]; then
+    echo "Error: Media library path is required"
+    show_usage
+    exit 1
+fi
+
+# Check if media library exists
+if [ ! -d "$MEDIA_LIBRARY" ]; then
+    echo "Error: Media library directory '$MEDIA_LIBRARY' not found"
+    exit 1
+fi
+
+# Set output directory if not specified
+if [ -z "$OUTPUT_DIR" ] && [ "$REPLACE_MODE" = false ]; then
+    OUTPUT_DIR="${MEDIA_LIBRARY}_opus"
+fi
+
+# Function to check if file needs conversion
+needs_conversion() {
+    local input_file="$1"
+    local output_file="$2"
+    
+    # Check if input file is readable
+    if [ ! -r "$input_file" ]; then
+        echo "    WARNING: File not readable: $input_file"
+        return 1
+    fi
+    
+    # If force mode, always convert
+    if [ "$FORCE_MODE" = true ]; then
+        return 0
+    fi
+    
+    # Check if output file already exists and is newer than input
+    if [ -f "$output_file" ] && [ "$output_file" -nt "$input_file" ]; then
+        return 1  # No conversion needed
+    fi
+    
+    return 0  # Needs conversion
+}
+
+# Function to process a single FLAC file
+process_flac_file() {
+    local input_file="$1"
+    local relative_path="$2"
+    local output_file=""
+    
+    # Determine output file path
+    if [ "$REPLACE_MODE" = true ]; then
+        # Replace .flac with .opus in same location
+        output_file="${input_file%.flac}.opus"
+    elif [ "$PRESERVE_MODE" = true ]; then
+        local dir=$(dirname "$input_file")
+        local filename=$(basename "$input_file" .flac)
+        output_file="$dir/${filename}.opus"
+    else
+        # Change extension from .flac to .opus
+        local opus_relative_path="${relative_path%.flac}.opus"
+        output_file="$OUTPUT_DIR/$opus_relative_path"
+    fi
+    
+    # Check if conversion is needed
+    if ! needs_conversion "$input_file" "$output_file"; then
+        echo "  SKIP: $relative_path (Opus file exists and is newer)"
+        ((SKIPPED_COUNT++))
+        return
+    fi
+    
+    if [ "$TEST_MODE" = true ]; then
+        echo "  WOULD CONVERT: $relative_path → $(basename "$output_file") @ ${OPUS_BITRATE}kbps"
+        return
+    fi
+    
+    # Create output directory if needed
+    local output_dir=$(dirname "$output_file")
+    if [ ! -d "$output_dir" ]; then
+        echo "    Creating directory: $output_dir"
+        if ! mkdir -p "$output_dir"; then
+            echo "  ✗ ERROR: Cannot create output directory: $output_dir"
+            ((ERROR_COUNT++))
+            return
+        fi
+    fi
+    
+    # Verify input file exists and is readable
+    if [ ! -f "$input_file" ]; then
+        echo "  ✗ ERROR: Input file not found: $input_file"
+        ((ERROR_COUNT++))
+        return
+    fi
+    
+    if [ ! -r "$input_file" ]; then
+        echo "  ✗ ERROR: Input file not readable: $input_file"
+        ((ERROR_COUNT++))
+        return
+    fi
+    
+    # Create temporary file for safe processing
+    local temp_file="${output_file}.tmp.opus"
+    
+    echo "  CONVERTING: $relative_path → Opus ${OPUS_BITRATE}kbps"
+    
+    # Convert the file to Opus
+    echo "    Command: ffmpeg -i \"$input_file\" -c:a libopus -b:a ${OPUS_BITRATE}k -vbr on -compression_level 10 -y \"$temp_file\""
+    
+    if ffmpeg -i "$input_file" -c:a libopus -b:a "${OPUS_BITRATE}k" -vbr on -compression_level 10 -y "$temp_file" 2>"${temp_file}.log"; then
+        # Move temp file to final location
+        mv "$temp_file" "$output_file"
+        echo "  ✓ DONE: $(basename "$output_file")"
+        rm -f "${temp_file}.log"
+        ((PROCESSED_COUNT++))
+        
+        # If replace mode, remove original FLAC file
+        if [ "$REPLACE_MODE" = true ]; then
+            rm "$input_file"
+            echo "    Removed original: $(basename "$input_file")"
+        fi
+    else
+        echo "  ✗ ERROR: Failed to convert $relative_path"
+        echo "    Error log saved to: ${temp_file}.log"
+        if [ -f "${temp_file}.log" ]; then
+            echo "    Last few lines of error:"
+            tail -n 5 "${temp_file}.log" | sed 's/^/    /'
+        fi
+        rm -f "$temp_file"
+        ((ERROR_COUNT++))
+    fi
+}
+
+# Function to process an album directory
+process_album() {
+    local album_dir="$1"
+    local album_name=$(basename "$album_dir")
+    
+    echo "Processing album: $album_name"
+    
+    # Find all FLAC files in the album directory
+    local flac_files=()
+    while IFS= read -r -d '' file; do
+        flac_files+=("$file")
+    done < <(find "$album_dir" -name "*.flac" -type f -print0)
+    
+    if [ ${#flac_files[@]} -eq 0 ]; then
+        echo "  No FLAC files found in $album_name"
+        return
+    fi
+    
+    # Process each FLAC file
+    for flac_file in "${flac_files[@]}"; do
+        local relative_path="${flac_file#$MEDIA_LIBRARY/}"
+        process_flac_file "$flac_file" "$relative_path"
+    done
+    
+    echo ""
+}
+
+# Main processing
+echo "Media Library FLAC to Opus Converter"
+echo "===================================="
+echo "Input:   $MEDIA_LIBRARY"
+echo "Bitrate: ${OPUS_BITRATE}kbps"
+
+if [ "$TEST_MODE" = true ]; then
+    echo "Mode:    TEST MODE (no files will be modified)"
+elif [ "$REPLACE_MODE" = true ]; then
+    echo "Mode:    REPLACE (original FLAC files will be deleted after conversion)"
+elif [ "$PRESERVE_MODE" = true ]; then
+    echo "Mode:    PRESERVE (Opus files created alongside originals)"
+else
+    echo "Output:  $OUTPUT_DIR"
+fi
+
+if [ "$FORCE_MODE" = true ]; then
+    echo "Force:   Enabled (will re-convert existing Opus files)"
+fi
+
+echo ""
+
+# Find all directories that contain FLAC files (potential albums)
+album_dirs=()
+while IFS= read -r -d '' dir; do
+    if find "$dir" -maxdepth 1 -name "*.flac" -type f | grep -q .; then
+        album_dirs+=("$dir")
+    fi
+done < <(find "$MEDIA_LIBRARY" -type d -print0)
+
+if [ ${#album_dirs[@]} -eq 0 ]; then
+    echo "No albums with FLAC files found in $MEDIA_LIBRARY"
+    exit 0
+fi
+
+echo "Found ${#album_dirs[@]} album(s) with FLAC files"
+echo ""
+
+# Process each album
+for album_dir in "${album_dirs[@]}"; do
+    process_album "$album_dir"
+done
+
+# Summary
+echo "Conversion Summary:"
+echo "=================="
+echo "Converted: $PROCESSED_COUNT files"
+echo "Skipped:   $SKIPPED_COUNT files (already converted or newer)"
+echo "Errors:    $ERROR_COUNT files"
+
+if [ "$ERROR_COUNT" -gt 0 ]; then
+    exit 1
+fi