def METHOD_NAME (self, param, value, seq):
    """
    Set cap-info parameters' value of a specific pcap file.
    :parameters:  
        param : str
            the name of the parameters to be set.
        value : int/float
            the desired value to be set to `param` key.
        seq : int
            an index to the relevant caps array to be changed (index supplied when adding new pcap file, see :func:`add_pcap_file`).
    :return: 
        **True** on success
    :raises:
        :exc:`IndexError`, in case an out-of range index was given.
    """
    try:
        self.yaml_obj[0]['cap_info'][seq][param] = value
        return True
    except IndexError:
        return False