A bash script to concurrently convert flac files to mp3

flac_to_mp3_concurrent.sh

#!/bin/bash

num_concurrent=6
source_folder="<path to flac directory>"
destination_folder="<path to output mp3>"

if [ ! -d "$destination_folder" ]; then
    mkdir -p "$destination_folder"
fi

process_concurrently() {
    local i=0
    local j=0

    for file in "$source_folder"/*.flac; do
        echo "Converting $file"
        base_name=$(basename "$file" .flac)
        echo "Saving to: $destination_folder/$base_name.mp3"
        ffmpeg -y -i "$file" -codec:a libmp3lame -q:a 0 -map_metadata 0 -id3v2_version 3 -write_id3v1 1 "$destination_folder/$base_name.mp3" &

        ((i++))
        ((j++))
        # Limit the number of concurrent processes
        if [[ $j -eq $num_concurrent ]]; then
            wait -n
            ((j--))
        fi
    done

     # Wait for all remaining processes to finish
    wait
}

process_concurrently