Pre-processing the file. Conversion to wav and moving to conversion folder

Pre-processing_StD.py

#Pre-processing function
def preprocessing(path_base, path_converted_audio):
    for file in os.listdir(path_base):
        filename, file_extension = os.path.splitext(file)
        print("\nFile name: " + file)
        if file_extension == ".wav":
            file_to_process = file
            shutil.copy(path_base + file, path_converted_audio + file)
        elif file_extension in extension_to_convert:
            subprocess.call(['ffmpeg', '-i', path_base + file,
            path_base + filename + ".wav"])
            shutil.move(path_base + filename + ".wav", path_converted_audio + filename + ".wav")
            print(file + " is converted into " + filename +".wav")
        else:
            print("ERROR: Unsupported file type - "+ file + " was not converted. Modify the pre-processing stage to convert *" + file_extension + " files.")