Set the output for a media.
        @param psz_name: the media to work on.
        @param psz_output: the output MRL (the parameter to the "sout" variable).
        @return: 0 on success, -1 on error.

def vlm_set_output(self, psz_name, psz_output):
        '''Set the output for a media.
        @param psz_name: the media to work on.
        @param psz_output: the output MRL (the parameter to the "sout" variable).
        @return: 0 on success, -1 on error.
        '''
        return libvlc_vlm_set_output(self, str_to_bytes(psz_name), str_to_bytes(psz_output))