Harris ADC 100, Руководство пользователя

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Harris ADC Device Server User’s Guide
Video Disk Configuration 3-7
disks. The Device Postroll can be longer or shorter than the list postroll. Its main purpose
is to clear out the disk status line quickly after the disk stops playing, so the status line can
be loaded with the next event to cue. This allows small spots to be played back to back. If
the Device Postroll was set to a larger value, and the disk had over recorded the ID
compared to the play duration, the disk would continue to play for the post roll duration
if on air play switched to another device. This would permit mix effects during the post
roll of the disk device into the play out from another device.
Seconds . Select a value of up to 59 seconds.
Frames . Select a value of at least 4 frames.
NOTE:
The Seconds and Frames values have no effect unless the Use Postroll box is enabled
(checked).
Prerolls
Disk Prerolls . This has a default of zero seconds. The values can range from zero frames to
300 frames. This feature should not be used unless specified by the disk manufacturer or
Harris (refer to device-specific information). Four frames is the minimum preroll allowed.
Preroll is sent to the video disk port when initialized or configured. All play and record
commands are executed at a given time after receipt of the command
Disk preroll provides the preroll the disk requires for frame-accurate playout. It gives the
disk more time to get the required video on air on the correct frame. Disk preroll must be
set to the same value as Number of Frames to Send Play Early (discussed below).
Frames To Send Play Early . The default is 0 and should not need to be changed unless the
disk has a fixed latency of greater than one frame for the play command. This setting
determines when (number of frames) the video disk port should receive the play/record
command before playout or recording is performed. A setting of zero sends the play or
record command to the disk port the frame before the command is performed. The setting
should never be greater than four frames less than List Preroll or Instant Preroll or the disk
port will not play and the list will stop. If
Disk Prerolls is used, the Frames setting should be
the same value unless a frame or two of switcher timing compensation is required.