Imagine NEO DVR-3901, Installation And Operation Manual

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68 DVR-3901 Installation and Operation Manual
Chapter 5: Functions and Controls
BVW/Odetics Mode
This mode can operate in two ways: with and without the Odetics
extension.
Without Odetics Extension
In BVW mode, the disk space is viewed as a virtual linear tape recorded
with black and prestriped with 24 hours of time code. When a clip is
recorded, if LTC input is present, the time code determines the clip’s
location on the virtual tape. If you record a clip with time code from
hour 2 to hour 4, and another clip with time code from hour 5 to hour 6,
you would have a one hour gap filled with black video between hour 4
and hour 5. If LTC input is not present, the time code automatically
increments during recording, so you can cue to the time code location.
Only recorded material occupies disk space. When newly formatted, the
disk is empty. The virtual tape can still be played back and is all black.
If, as in the above example, you record a video clip from time code
hour 2 to hour 4, and another from hour 5 to hour 6, your disk will only
hold three hours of video. The physical location of a video on the disk
has no relationship to that video’s position in the 24 hour time code.
In BVW/Odetics mode, when you record material with the same time
code as previously recorded video, the DVR-3901 deletes the
previously recorded material with identical time codes. This deletion
does not occur until after a recording is complete. Consequently, it is
not possible to overwrite a video recording when the disk space
available is less than the length of the video clip to be recorded; the disk
could be filled before the recording has finished and before the
overwritten video can be deleted from the disk.
To avoid the accidental loss of previously recorded material, keep a
record of recorded material to consult before making new recordings.
With Odetics Extension
In this mode, the DVR-3901 supports Odetics extension commands.
Each Odetics ID is identified as a clip that may occupy 24 hours of time
code space. Recording, playback and storage otherwise work in the
same way as when the Odetics extension is not used. Existing Odetics
automation controllers are supported.
Note
W
hen the disk is full, the
disk may not actually
contain 24 hours of video.
If a full disk contains 6
hours worth of video,
there will be 24-6=18
hours of black when
playing back the whole 24
hours.