def set_video_stream_param(self, streamtype, resolution, bitrate,
            framerate, gop, isvbr, callback=None):
        '''
        Set the video stream param of stream N
        streamtype(0~3): Stream N.
        resolution(0~4): 0 720P,
                         1 VGA(640*480),
                         2 VGA(640*360),
                         3 QVGA(320*240),
                         4 QVGA(320*180).
        bitrate: Bit rate of stream type N(20480~2097152).
        framerate: Frame rate of stream type N.
        GOP: P frames between 1 frame of stream type N.
             The suggest value is: X * framerate.
        isvbr: 0(Not in use currently), 1(In use).
        '''
        params = {'streamType': streamtype,
                  'resolution': resolution,
                  'bitRate'   : bitrate,
                  'frameRate' : framerate,
                  'GOP'       : gop,
                  'isVBR'     : isvbr
                 }
        return self.execute_command('setVideoStreamParam',
                                    params, callback=callback)