cleanup and naming improvements

        ref_output_file = f"{reference_path}/param_file/dec/{output_file}"

        # set to false per default even if this is no JBM case - makes later check for failure easier

        tracefile_lengths_differ = False

        tracefile_last_rtp_numbers_differ = False

        if len(tracefile_dec) > 0:

            dut_tracefile_dec = f"{dut_base_path}/param_file/dec/{tracefile_dec}"

            ref_tracefile_dec = f"{reference_path}/param_file/dec/{tracefile_dec}"

            # check for same RTP sequence number in last line of tracefile

            dut_tracefile_last_line = np.genfromtxt(dut_tracefile_dec, delimiter=";")[-1,:]

            ref_tracefile_last_line = np.genfromtxt(ref_tracefile_dec, delimiter=";")[-1,:]

            tracefile_lengths_differ = (

                dut_tracefile_last_line[0] != ref_tracefile_last_line[0]

            )

            dut_rtp_num_last = np.genfromtxt(dut_tracefile_dec, delimiter=";")[-1,0]

            ref_rtp_num_last = np.genfromtxt(ref_tracefile_dec, delimiter=";")[-1,0]

            tracefile_last_rtp_numbers_differ = dut_rtp_num_last != ref_rtp_num_last

        # same sequence number -> likely no crash, assume length difference is due to difference in TSM

        # to get MLD and abs diff values for now - even though they might be meaningless due to

        # shift differences between the two signals - cut longer signal to shorter size

        allow_differing_lengths = not tracefile_lengths_differ

        allow_differing_lengths = not tracefile_last_rtp_numbers_differ

        fs = int(sampling_rate) * 1000

        output_differs, reason = cmp_pcm(