Convert a folder of .flac albums to 192kbps MP3s to save space on my OpenSwim headphones

convert_to_mp3.sh

#!/bin/bash

# Define the source and target directories.
SOURCE_DIR="./originals"
TARGET_DIR="./processed"

# Ensure ffmpeg is installed.
if ! command -v ffmpeg &> /dev/null
then
    echo "ffmpeg could not be found, please install it."
    exit 1
fi

# Remove the year prefix from the album name, if present.
strip_year() {
    local album_name="$1"
    # This regex removes a leading year in the format "YYYY - ".
    echo "$album_name" | sed -E 's/^[0-9]{4} - //'
}

# Iterate over the artist directories.
for artist_path in "$SOURCE_DIR"/*; do
    if [ -d "$artist_path" ]; then
        artist_name=$(basename "$artist_path")

        # Iterate over the album directories within each artist directory.
        for album_path in "$artist_path"/*; do
            if [ -d "$album_path" ]; then
                album_name=$(basename "$album_path")

                # Strip the year from the album name.
                processed_album_name=$(strip_year "$album_name")

                # Create a processed directory for the artist-album.
                mkdir -p "$TARGET_DIR/$artist_name - $processed_album_name"

                # Convert each FLAC file to MP3.
                for flac_file in "$album_path"/*.flac; do
                    if [ -f "$flac_file" ]; then
                        base_name=$(basename "$flac_file" .flac)
                        mp3_file="$TARGET_DIR/$artist_name - $processed_album_name/$base_name.mp3"

                        # Convert to MP3 with 192 kbps bitrate.
                        ffmpeg -i "$flac_file" -ab 192k "$mp3_file"
                    fi
                done
            fi
        done
    fi
done