more robust parsing for Input level and Scaling Factor

import copy

import logging

import re

from pathlib import Path

from tempfile import TemporaryDirectory

from typing import Optional, Tuple, Union

        result = run(cmd, logger=logger)

        # parse output

        measured_loudness = float(result.stdout.splitlines()[3].split(":")[1])

        scale_factor = float(result.stdout.splitlines()[-3].split(":")[1])

        tmp_string = re.findall(r'Input level:\s+[-+]?(?:\d*\.*\d+)', result.stdout)[0]

        measured_loudness = float(tmp_string.split(":")[1])

        tmp_string = re.findall(r'Scaling factor:\s+[-+]?(?:\d*\.*\d+)', result.stdout)[0]

        scale_factor = float(tmp_string.split(":")[1])

    return measured_loudness, scale_factor