def get_value_from_dict_using_lower_key(field, dictionary):
        """Obtains a value from a dictionary using a key, no matter if the key
        is uppercased in the dictionary. This function is needed because
        some media containers convert to uppercase metadata field names.
        """
        value = None
        for d_field, d_value in dictionary.items():
            if str(d_field).lower() == field:
                value = d_value
                break
        return value
Obtains a value from a dictionary using a key, no matter if the key
        is uppercased in the dictionary. This function is needed because
        some media containers convert to uppercase metadata field names.
        
tests/test_ffmpeg_reader.py