Traverse subdirectories (albums) and convert them to a flat list of 192kbps mp3s. Used for the Digital Media Sound Player.

convert-albums-to-flat-list.sh

#!/bin/bash

# Ensure the 'converted' directory exists
mkdir -p converted

# Initialize a counter for file naming
counter=1

# Allowed audio file extensions
allowed_extensions="flac mp3 wav"

# Function to convert files
convert_files() {
  local path="$1"
  for file in "$path"/*; do
    if [[ -f "$file" ]]; then
      # Extract the file extension
      local extension="${file##*.}"
      local filename="${file##*/}"  # Extracts only the filename from the path

      # Check if the file extension is one of the allowed types
      if [[ $allowed_extensions =~ $extension ]]; then
        local bitrate="192k"

        # Get current file's bitrate
        current_bitrate=$(ffprobe -v error -select_streams a:0 -show_entries stream=bit_rate -of default=noprint_wrappers=1:nokey=1 "$file")

        # Check if bitrate conversion is necessary
        if [[ "$current_bitrate" != "N/A" && "$current_bitrate" -lt 192000 ]]; then
          bitrate="${current_bitrate}k"
        fi

        # Convert the file, ensuring all metadata including album art is removed
        ffmpeg -i "$file" -ab $bitrate -map_metadata -1 -map 0:a -vn -y "./converted/$(printf "%03d" $counter)_${filename%.${extension}}.mp3"
        ((counter++))
      fi
    elif [[ -d "$file" && "${file##*/}" != "converted" ]]; then
      # Recursive call if directory and not the 'converted' directory
      convert_files "$file"
    fi
  done
}

# Start conversion from the current directory
convert_files "."

echo "Conversion complete. Files are saved in 'converted' directory."