add flac downsampling
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nnduc
268
ffmpeg-flac-downsampling.sh
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268
ffmpeg-flac-downsampling.sh
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@ -0,0 +1,268 @@
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#!/bin/bash
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# Media Library FLAC Downsampling Script
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# Processes multiple albums in a media library, downsampling all FLAC files to 44.1 kHz
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# Check if ffmpeg is installed
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if ! command -v ffmpeg &> /dev/null; then
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echo "Error: ffmpeg is not installed or not in PATH"
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exit 1
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fi
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# Function to display usage
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show_usage() {
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echo "Usage: $0 [OPTIONS] <media_library_path>"
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echo ""
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echo "Options:"
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echo " -o, --output DIR Output directory (default: creates _44k suffix)"
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echo " -r, --replace Replace original files (use with caution)"
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echo " -p, --preserve Preserve original files alongside new ones"
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echo " -t, --test Test mode - show what would be processed"
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echo " -h, --help Show this help message"
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echo ""
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echo "Examples:"
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echo " $0 /path/to/music/library"
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echo " $0 -o /path/to/output /path/to/music/library"
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echo " $0 --test /path/to/music/library"
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echo " $0 --replace /path/to/music/library"
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}
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# Default options
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OUTPUT_DIR=""
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REPLACE_MODE=false
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PRESERVE_MODE=false
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TEST_MODE=false
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PROCESSED_COUNT=0
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SKIPPED_COUNT=0
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ERROR_COUNT=0
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# Parse command line arguments
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while [[ $# -gt 0 ]]; do
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case $1 in
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-o|--output)
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OUTPUT_DIR="$2"
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shift 2
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;;
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-r|--replace)
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REPLACE_MODE=true
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shift
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;;
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-p|--preserve)
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PRESERVE_MODE=true
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shift
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;;
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-t|--test)
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TEST_MODE=true
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shift
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;;
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-h|--help)
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show_usage
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exit 0
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;;
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-*)
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echo "Unknown option: $1"
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show_usage
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exit 1
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;;
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*)
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MEDIA_LIBRARY="$1"
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shift
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;;
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esac
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done
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# Check if media library path is provided
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if [ -z "$MEDIA_LIBRARY" ]; then
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echo "Error: Media library path is required"
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show_usage
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exit 1
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fi
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# Check if media library exists
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if [ ! -d "$MEDIA_LIBRARY" ]; then
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echo "Error: Media library directory '$MEDIA_LIBRARY' not found"
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exit 1
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fi
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# Set output directory if not specified
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if [ -z "$OUTPUT_DIR" ] && [ "$REPLACE_MODE" = false ]; then
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OUTPUT_DIR="${MEDIA_LIBRARY}_44k"
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fi
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# Function to check if file needs downsampling
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needs_downsampling() {
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local file="$1"
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# Check if file is readable
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if [ ! -r "$file" ]; then
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echo " WARNING: File not readable: $file"
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return 1
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fi
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local sample_rate=$(ffprobe -v quiet -select_streams a:0 -show_entries stream=sample_rate -of csv=p=0 "$file" 2>/dev/null)
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if [ -z "$sample_rate" ]; then
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echo " WARNING: Could not determine sample rate for: $(basename "$file")"
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return 1 # Skip files we can't analyze
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elif [ "$sample_rate" = "44100" ]; then
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return 1 # No downsampling needed
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else
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echo " Current sample rate: ${sample_rate} Hz"
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return 0 # Needs downsampling
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fi
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}
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# Function to process a single FLAC file
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process_flac_file() {
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local input_file="$1"
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local relative_path="$2"
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local output_file=""
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# Determine output file path
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if [ "$REPLACE_MODE" = true ]; then
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output_file="$input_file"
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elif [ "$PRESERVE_MODE" = true ]; then
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local dir=$(dirname "$input_file")
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local filename=$(basename "$input_file" .flac)
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output_file="$dir/${filename}_44k.flac"
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else
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output_file="$OUTPUT_DIR/$relative_path"
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fi
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# Check if downsampling is needed
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if ! needs_downsampling "$input_file"; then
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echo " SKIP: $relative_path (already 44.1 kHz)"
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((SKIPPED_COUNT++))
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return
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fi
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if [ "$TEST_MODE" = true ]; then
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echo " WOULD PROCESS: $relative_path → $(basename "$output_file")"
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return
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fi
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# Create output directory if needed
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local output_dir=$(dirname "$output_file")
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if [ ! -d "$output_dir" ]; then
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echo " Creating directory: $output_dir"
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if ! mkdir -p "$output_dir"; then
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echo " ✗ ERROR: Cannot create output directory: $output_dir"
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((ERROR_COUNT++))
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return
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fi
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fi
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# Verify input file exists and is readable
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if [ ! -f "$input_file" ]; then
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echo " ✗ ERROR: Input file not found: $input_file"
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((ERROR_COUNT++))
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return
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fi
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if [ ! -r "$input_file" ]; then
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echo " ✗ ERROR: Input file not readable: $input_file"
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((ERROR_COUNT++))
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return
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fi
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# Create temporary file for safe processing (use .flac extension)
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local temp_file="${output_file}.tmp.flac"
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echo " PROCESSING: $relative_path"
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# Downsample the file
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echo " Command: ffmpeg -i \"$input_file\" -ar 44100 -c:a flac -compression_level 8 -y \"$temp_file\""
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if ffmpeg -i "$input_file" -ar 44100 -c:a flac -compression_level 8 -y "$temp_file" 2>"${temp_file}.log"; then
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# Move temp file to final location
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mv "$temp_file" "$output_file"
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echo " ✓ DONE: $(basename "$output_file")"
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rm -f "${temp_file}.log"
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((PROCESSED_COUNT++))
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else
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echo " ✗ ERROR: Failed to process $relative_path"
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echo " Error log saved to: ${temp_file}.log"
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if [ -f "${temp_file}.log" ]; then
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echo " Last few lines of error:"
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tail -n 5 "${temp_file}.log" | sed 's/^/ /'
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fi
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rm -f "$temp_file"
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((ERROR_COUNT++))
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fi
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}
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# Function to process an album directory
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process_album() {
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local album_dir="$1"
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local album_name=$(basename "$album_dir")
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echo "Processing album: $album_name"
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# Find all FLAC files in the album directory
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local flac_files=()
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while IFS= read -r -d '' file; do
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flac_files+=("$file")
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done < <(find "$album_dir" -name "*.flac" -type f -print0)
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if [ ${#flac_files[@]} -eq 0 ]; then
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echo " No FLAC files found in $album_name"
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return
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fi
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# Process each FLAC file
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for flac_file in "${flac_files[@]}"; do
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local relative_path="${flac_file#$MEDIA_LIBRARY/}"
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process_flac_file "$flac_file" "$relative_path"
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done
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echo ""
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}
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# Main processing
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echo "Media Library FLAC Downsampler"
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echo "==============================="
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echo "Input: $MEDIA_LIBRARY"
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if [ "$TEST_MODE" = true ]; then
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echo "Mode: TEST MODE (no files will be modified)"
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elif [ "$REPLACE_MODE" = true ]; then
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echo "Mode: REPLACE (original files will be overwritten)"
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elif [ "$PRESERVE_MODE" = true ]; then
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echo "Mode: PRESERVE (44k files created alongside originals)"
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else
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echo "Output: $OUTPUT_DIR"
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fi
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echo ""
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# Find all directories that contain FLAC files (potential albums)
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album_dirs=()
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while IFS= read -r -d '' dir; do
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if find "$dir" -maxdepth 1 -name "*.flac" -type f | grep -q .; then
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album_dirs+=("$dir")
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fi
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done < <(find "$MEDIA_LIBRARY" -type d -print0)
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if [ ${#album_dirs[@]} -eq 0 ]; then
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echo "No albums with FLAC files found in $MEDIA_LIBRARY"
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exit 0
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fi
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echo "Found ${#album_dirs[@]} album(s) with FLAC files"
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echo ""
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# Process each album
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for album_dir in "${album_dirs[@]}"; do
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process_album "$album_dir"
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done
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# Summary
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echo "Processing Summary:"
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echo "=================="
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echo "Processed: $PROCESSED_COUNT files"
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echo "Skipped: $SKIPPED_COUNT files (already 44.1 kHz)"
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echo "Errors: $ERROR_COUNT files"
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if [ "$ERROR_COUNT" -gt 0 ]; then
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exit 1
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fi
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