format  void MPG_SpDisconnectWin (MpgSp mpgsp, MpgWn mpgwn, Sint32 bnk)
 Input  mpgsp: MPEG still image handle
  mpgwn: MPEG window
:  bnk: Frame bank number
 Output  None
 Function value  None
 Function  Disconnects the MPEG still image handle and the MPEG window. 

  format  Sint32MPG_SpOutput (MpgSp mpgsp, Sint32 bnk)
 Input  mpgsp: MPEG still image handle
:  bnk: Frame bank number
 Output  None
 Function value  Error code
 Function  Outputs a still image. If another MPEG still image handle or MPEG movie handle is being output
  fails and no still image is output.
  The MPEG window connected to the specified frame bank number is output.
.  If direct output to VDP2 is specified, it is connected to the specified bank.
The direct output window   is used. For output by host transfer,
  The image in the buffer area of ​​the host transfer window connected to the specified bank.
 Data  will be transferred.
 Remarks  (a) mpgsp must be in the host output mode and the operating state must be playing.
  Otherwise, still image output will fail.