format  void MPG_MvSetVideoChan (MpgMv mpgmv, Sint32 vch)
 Input  mpgmv: MPEG video handle
:  vch: channel number (MPG_IGNORE: unspecified)
 Output  None
 Function value  None
 Function  Specify the video channel to be played. The default is unspecified.
  When this function is called, the channel is switched immediately. Channel number match
 Data without  will be deleted from the CD buffer.
 Remarks  (a) This function works for video layer streams. System layer
 Cannot be used for streams . 

  format  void MPG_MvSetAudioChan (MpgMv mpgmv, Sint32 ach)
 Input  mpgmv: MPEG video handle
:  ach: Channel number (MPG_IGNORE: unspecified)
 Output  None
 Function value  None
 Function  Specify the audio channel to be played. The default is unspecified.
  When this function is called, the channel is switched immediately. Channel number match
 Data without  will be deleted from the CD buffer.
 Remarks  (a) This function works for video layer streams. System layer
 Cannot be used for streams . 

  format  void MPG_MvSetVideoId (MpgMv mpgmv, Sint32 vid)
 Input  mpgmv: MPEG video handle
  vid: Video stream number (MPG_IGNORE: unspecified)
 Output  None
 Function value  None
 Function  Specify the stream number of the video to be played. The default is unspecified.
 Data  Data that does not match the stream number will be erased sequentially from the CD buffer.
. 
 Remarks  (a) When this function is executed during audio / video synchronized playback, video and audio are synchronized
  is not guaranteed.