code: def set_option(self, key, value):
          
  
          akey = AVal(key)
          aval = AVal(value)
  
          res = librtmp.RTMP_SetOpt(self.rtmp, akey.aval, aval.aval)
  
          if res < 1:
              raise ValueError("Unable to set option {0}".format(key))
  
          self._options[akey] = aval
docs: Sets a option for this session.
  
          For a detailed list of available options see the librtmp(3) man page.
  
          :param key: str, A valid option key.
          :param value: A value, anything that can be converted to str is valid.
  
          Raises :exc:`ValueError` if a invalid option is specified.