metadata_update_convert.sh

#!/bin/bash

# Check if the directory is provided as an argument
if [ $# -eq 0 ]; then
    echo "Usage: $0 <directory>"
    exit 1
fi

# Directory containing the audio files
DIRECTORY=$1

# Check if the directory exists
if [ ! -d "$DIRECTORY" ]; then
    echo "Error: Directory '$DIRECTORY' does not exist."
    exit 1
fi

# Prompt for artist name and album title
read -p "Enter the artist name: " ARTIST
read -p "Enter the album title: " ALBUM
read -p "Enter the path to album art (leave blank if none): " ALBUM_ART

# Iterate over M4A files in the directory
for FILE in "$DIRECTORY"/*.m4a; do
    # Skip if no M4A files are found
    if [ ! -e "$FILE" ]; then
        echo "No M4A files found in the directory."
        exit 0
    fi

    # Extract the base filename (without the directory path)
    BASENAME=$(basename "$FILE" .m4a)

    # Extract the track number (before the "-")
    TRACK_NUMBER=$(echo "$BASENAME" | cut -d'-' -f1 | tr -d '[:space:]')

    # Extract the title (after the "-")
    TITLE=$(echo "$BASENAME" | cut -d'-' -f2- | tr -d '[:space:]')

    # Convert M4A to MP3 using ffmpeg
    MP3_FILE="$DIRECTORY/$BASENAME.mp3"
    echo "Converting '$FILE' to MP3..."
    ffmpeg -i "$FILE" -q:a 0 "$MP3_FILE" -y

    # Apply metadata using eyeD3
    echo "Updating metadata for '$MP3_FILE': Track $TRACK_NUMBER, Title '$TITLE', Artist '$ARTIST', Album '$ALBUM'"
    eyeD3 --track="$TRACK_NUMBER" --title="$TITLE" --artist="$ARTIST" --album="$ALBUM" "$MP3_FILE"

    # Add album art if provided
    if [ -n "$ALBUM_ART" ]; then
        echo "Adding album art from '$ALBUM_ART' to '$MP3_FILE'"
        eyeD3 --add-image="$ALBUM_ART:FRONT_COVER" "$MP3_FILE"
    fi
done

echo "Conversion and metadata update complete."