• Broadcasting

  Grassvalley AMPprotocol Question

  Posted by Maurice Jansen on May 31, 2009 at 11:25 am

  Sorry for this rather big Quote out of a document
  about the GVG-AMPprotocol.
  and i’m not sure if this is the right forum?
  but do i interpret this ok when i give the DDR
  this command that it wil go in play on a specific time.
  coming from the internal generator or external LTC.
  can i schedule playback with this command nomatter what timecode is
  in the clip.
  do all AMP compliant servers react the same on the protocol or are there commands that cannot beused on for instance a GVG-Turbo.

  i want to trigger a rig of 4Turbo’s in a backdrop projection setup
  with timecode coming out of a PB-VT

  Command Sent
  2X.01 Play
  Command Type 2
  Byte count 0 or 4
  Command Code 01
  Send Data 1 4 byte time (Timecode Format5.1 (ffssmmhh)) (Optional)
  Returns
  ACK
  Comments
  This command places the video disk recorder in the play mode, and playback will
  begin. Playback begins from the current timecode position on the currently loaded
  ID. The timecode position will increase and new video material will be output
  until playback is stopped.
  If auto mode is enabled, the Play command will initiate the auto play processing
  described under the Auto Mode On command (40.41).
  There should be a fixed latency in number of frames from the time this command
  is issued, after a Play Cue or In Preset is issued, until the video disk recorder
  begins playback. This allows the controlling device to ‘frame accurately’ play
  material.
  When a Play command is issued, the stop status (status byte 1, bit 5) will be set
  low, and the play status (status byte 1, bit 0) and servo lock status (status byte 2,
  bit 7) will be set high.
  This command can be sent with 0 or 4 bytes of Data. If zero bytes of data are
  received, then the Play will begin a frame after the command is received.

  If 4 bytes of data are received, then the Play will begin a frame after the time on
  the timecode generator on the disk recorder reaches the specified time. The
  timecode generator used will depend on the timer mode set. The Event Schedule
  Failed status bit (status byte 4, bit 1) will get set if the disk recorder was not able
  to schedule the Play. The status bits described earlier will get set when the Play
  actually begins. If any other shuttle command is sent after this command, then this
  command will be cancelled.
  If any Play, Stop or Record command without a timecode is sent after this
  command, then the event associated with this command will get cancelled. This
  command will also get cancelled if a Rewind or Fast Forward command is sent.
  If a timecode is provided with this command, it should be sent at least four frames
  prior to the specified timecode.

  greet
  Maurice

  Maurice Jansen replied 16 years, 11 months ago 1 Member · 0 Replies
• 0 Replies

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