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compress.bash

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+#!/bin/bash
+
+# =============================================================================
+# Batch Audio Compressor - 96 kbps AAC
+# Preserves folder structure, uses ffmpeg + GNU parallel + hardware acceleration
+# =============================================================================
+
+set -euo pipefail
+
+# -------------------------------
+# Configuration
+# -------------------------------
+SOURCE_DIR="${1:-./audio_source}"
+OUTPUT_DIR="${2:-./audio_96kbps}"
+LOG_FILE="./compression.log"
+#NUM_JOBS="1"
+NUM_JOBS="${PARALLEL_JOBS:-$(nproc)}" # Use all cores by default
+
+# Supported input audio extensions (lowercase)
+declare -a AUDIO_EXTS=("wav" "flac" "aiff" "aif" "mp3" "m4a" "ogg" "wma" "ac3" "alac")
+
+# -------------------------------
+# Functions
+# -------------------------------
+
+log() {
+  echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*" | tee -a "$LOG_FILE"
+}
+
+detect_hw_accel() {
+
+  echo "vdpau"
+  return
+
+  # Cuda?
+  if ffmpeg -hwaccels 2>/dev/null | grep -q cuda; then
+    echo "cuda"
+  # Try to detect available hardware acceleration
+  elif ffmpeg -hwaccels 2>/dev/null | grep -q vaapi; then
+    echo "vaapi"
+  elif ffmpeg -buildconf 2>&1 | grep -q "enable-vdpau"; then
+    echo "vdpau"
+  elif [[ "$(uname)" == "Darwin" ]] && ffmpeg -codecs 2>/dev/null | grep -q 'h264.* videotoolbox'; then
+    echo "videotoolbox"
+  else
+    echo "none"
+  fi
+}
+
+get_hw_args() {
+  local hw_accel="$1"
+  local input_file="$2"
+
+  case "$hw_accel" in
+  "vaapi")
+    echo "-vaapi_device /dev/dri/renderD128 -vf 'format=nv12,hwupload' -c:a aac -b:a 64k"
+    ;;
+  "videotoolbox")
+    # Apple's VideoToolbox (macOS) — fast for H.264, less useful for audio, but can accelerate some codecs
+    # Note: Audio encoding isn't accelerated, but we include for completeness if video is present
+    echo "-c:a aac -b:a 64k -c:v h264_videotoolbox"
+    ;;
+  *)
+    echo "-c:a libmp3lame -b:a 64k" # Fallback to software encoding
+    ;;
+  esac
+}
+
+# -------------------------------
+# Input validation
+# -------------------------------
+if [[ ! -d "$SOURCE_DIR" ]]; then
+  echo "Error: Source directory does not exist: $SOURCE_DIR"
+  echo "Usage: $0 <source_dir> <output_dir>"
+  exit 1
+fi
+
+mkdir -p "$OUTPUT_DIR"
+log "Starting compression of '$SOURCE_DIR' -> '$OUTPUT_DIR' at 96 kbps AAC"
+log "Using $NUM_JOBS parallel jobs"
+
+# -------------------------------
+# Detect hardware acceleration
+# -------------------------------
+HW_ACCEL="$(detect_hw_accel)"
+log "Hardware acceleration detected: $HW_ACCEL"
+
+# -------------------------------
+# Find all audio files and process them via parallel
+# -------------------------------
+# Export functions and variables for GNU parallel
+export -f get_hw_args
+export SOURCE_DIR
+export OUTPUT_DIR
+export HW_ACCEL
+
+# Build find command for all audio extensions
+find_cmd="find \"$SOURCE_DIR\" -type f \\( "
+for ext in "${AUDIO_EXTS[@]}"; do
+  find_cmd+=" -iname \"*.${ext}\" -o"
+done
+# Replace trailing "-o" with "\\)"
+find_cmd="${find_cmd% -o} \\)"
+
+# Use eval to execute the dynamic find command and pipe to parallel
+eval "$find_cmd" | sort | parallel -j"$NUM_JOBS" --progress --bar --joblog parallel_jobs.log --eta '
+    input_file="{}"
+    rel_path="${SOURCE_DIR:+${input_file#"$SOURCE_DIR"/}}"
+    output_file="'$OUTPUT_DIR'/${rel_path%.*}.mp3"
+
+    # Create output directory if needed
+    mkdir -p "$(dirname "$output_file")"
+
+    if [[ -f "$output_file" ]]; then
+        echo "Skipped (exists): $rel_path"
+        exit 0
+    fi
+
+    hw_args=$(get_hw_args "'$HW_ACCEL'" "$input_file")
+    ffmpeg -v warning -stats \
+           -i "$input_file" \
+           $hw_args \
+           -y "$output_file" \
+           && echo "Converted: $rel_path"
+'
+
+log "Compression complete. Output saved to: $OUTPUT_DIR"