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| #!/bin/bash | |
| # Enhanced FLAC to M4A conversion script with proper concurrency control | |
| set -euo pipefail | |
| get_total_size() { | |
| local files=("$@") | |
| if [[ ${#files[@]} -gt 0 ]]; then | |
| du -shc "${files[@]}" 2>/dev/null | tail -n1 | cut -f1 | |
| else | |
| echo "0B" | |
| fi | |
| } | |
| get_cpu_count() { | |
| if command -v nproc >/dev/null 2>&1; then | |
| nproc | |
| elif [[ "$OSTYPE" == "darwin"* ]]; then | |
| sysctl -n hw.logicalcpu | |
| else | |
| echo "4" | |
| fi | |
| } | |
| check_dependencies() { | |
| if ! command -v ffmpeg >/dev/null 2>&1; then | |
| echo "Error: ffmpeg is not installed or not in PATH" >&2 | |
| exit 1 | |
| fi | |
| } | |
| convert_file() { | |
| # Basic ffmpeg command | |
| # ffmpeg -i "$f" -c:a libfdk_aac -vbr 5 -map 0:a -map_metadata 0 "${f%.flac}.m4a" & | |
| local input_file="$1" | |
| local output_file="${input_file%.flac}.m4a" | |
| echo "Converting: $input_file -> $output_file" | |
| if ffmpeg -hide_banner -loglevel error \ | |
| -threads 1 \ | |
| -i "$input_file" \ | |
| -c:a libfdk_aac \ | |
| -vbr 5 \ | |
| -cutoff 20000 \ | |
| -afterburner 1 \ | |
| -eld_sbr 0 \ | |
| -signaling 0 \ | |
| -latm 0 \ | |
| -header_period 5 \ | |
| -map 0:a \ | |
| -map_metadata 0 \ | |
| -disposition:a:0 default \ | |
| -movflags +faststart+use_metadata_tags \ | |
| -write_id3v2 1 \ | |
| -id3v2_version 4 \ | |
| -metadata:s:a:0 language=und \ | |
| -avoid_negative_ts make_zero \ | |
| -fflags +bitexact+genpts \ | |
| -max_muxing_queue_size 1024 \ | |
| -y \ | |
| "$output_file" 2>/dev/null; then | |
| echo "✓ Completed: $output_file" | |
| elif ffmpeg -hide_banner -loglevel error \ | |
| -threads 1 \ | |
| -i "$input_file" \ | |
| -c:a aac \ | |
| -b:a 320k \ | |
| -cutoff 22100 \ | |
| -profile:a aac_low \ | |
| -aac_coder twoloop \ | |
| -aac_pns 1 \ | |
| -aac_is 0 \ | |
| -aac_ms 0 \ | |
| -map 0:a \ | |
| -map 0:a \ | |
| -map_metadata 0 \ | |
| -disposition:a:0 default \ | |
| -movflags +faststart+use_metadata_tags \ | |
| -write_id3v2 1 \ | |
| -id3v2_version 4 \ | |
| -metadata:s:a:0 language=und \ | |
| -avoid_negative_ts make_zero \ | |
| -fflags +bitexact+genpts \ | |
| -max_muxing_queue_size 1024 \ | |
| -y \ | |
| "$output_file" 2>/dev/null; then | |
| echo "✓ Completed: $output_file (using built-in AAC encoder)" | |
| else | |
| echo "✗ Failed: $input_file - trying with error output..." >&2 | |
| ffmpeg -i "$input_file" \ | |
| -c:a aac \ | |
| -b:a 320k \ | |
| -cutoff 22100 \ | |
| -map 0:a \ | |
| -map_metadata 0 \ | |
| -y \ | |
| "$output_file" | |
| return 1 | |
| fi | |
| } | |
| export -f convert_file | |
| main() { | |
| check_dependencies | |
| flac_files=(*.flac) | |
| if [[ ! -e "${flac_files[0]}" ]]; then | |
| echo "No FLAC files found in current directory" >&2 | |
| exit 1 | |
| fi | |
| MAX_JOBS=$(get_cpu_count) | |
| current_dir=$(basename "$PWD") | |
| output_dir="$current_dir" | |
| mkdir -p "$output_dir" | |
| total_input_size=$(get_total_size "${flac_files[@]}") | |
| echo "Input: ${#flac_files[@]} FLAC files, Total size: $total_input_size" | |
| echo "Starting conversion with $MAX_JOBS concurrent jobs..." | |
| echo | |
| printf '%s\0' "${flac_files[@]}" | \ | |
| xargs -0 -n 1 -P "$MAX_JOBS" -I {} bash -c 'convert_file "$@"' _ {} | |
| echo | |
| if ls *.m4a 1> /dev/null 2>&1; then | |
| m4a_files=(*.m4a) | |
| total_output_size=$(get_total_size "${m4a_files[@]}") | |
| converted_count=${#m4a_files[@]} | |
| mv *.m4a "$output_dir/" | |
| echo | |
| echo "📊 CONVERSION SUMMARY:" | |
| echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━" | |
| echo "Input: ${#flac_files[@]} FLAC files → $total_input_size" | |
| echo "Output: $converted_count M4A files → $total_output_size" | |
| echo "Files location: $output_dir/" | |
| echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━" | |
| else | |
| echo "❌ No M4A files were created" | |
| exit 1 | |
| fi | |
| } | |
| main "$@" |
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