docs: 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)