Open the subtitle file (detect encoding if necessary).

def open(self):
        """Open the subtitle file (detect encoding if necessary)."""
        with open(self.filename, 'rb') as file_open:
            binary = file_open.read()

        try:
            return binary.decode()
        except UnicodeDecodeError:
            encoding = get_encoding(binary)
            try:
                return binary.decode(encoding)
            except LookupError:
                return binary.decode(errors='ignore')
            except:  # pylint: disable=W0702
                open_error(self.filename)
        except:  # pylint: disable=W0702
            open_error(self.filename)