Merges specified mp3 files into a single file or if no mp3 files are specified, merges all mp3 files in the current directory
python3 merge_mp3.py
Optional arguments:
--files, -f The files to be merged (merged in the order of input).
--dir, -d The directory that contains the files to be merged (Instead of specifying individual files).
--sort, -s Sort input files before merge.
--output, -o Output path for the merged mp3 file.