SubC Imaging DVRO User Manual page 66

DATA VALIDATION
Drift Monitor
Drift Monitor
The DVR employs a special algorithm to detect when your
video file may be compromised and you have lost footage
as a result. The DVR will alert the user when the
difference between the expected recorded length and
actual recorded length increases beyond the set
threshold. This is set to 5% by default, which means you
will be alerted if you lose more than 3 seconds for every
60 recorded.
1. Max Drift
The maximum amount of footage you determine to be
acceptable loss. The minimum acceptable loss is 1%, or 36
seconds for every hour.
2. Time to wait
Set the interval after which the algorithm engages.
Monitoring cannot begin immediately because even an
extremely small difference (in absolute terms) on a very
small number can trigger the alert. For example, if the
expected length is 100ms and the actual file is 50ms, that
would register as 50% loss. The recording needs to
stabilize for at least a few seconds before it can start
monitoring.
3. Show Warning / Stop Recording on Max
Drift
Uncheck Show Warning if you do not want to
receive a popup warning message when drift
percentage goes over the maximum
threshold.
By default, the DVR stops recording when loss
above the threshold is detected. You will be
warned if you uncheck the box that the
recording will not stop if a problem is
detected. This should only be used in extreme
circumstances, such as if your drive has
degraded and you have no spare but still need
to record as best you can.
4. Drift
Current measured difference between
expected recorded length and actual
recorded length.
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Bottleneck Monitor
To mitigate data loss, the DVR
monitors the video write buffer. If
it increases beyond the set
threshold, data will be lost. This is
an indication that the drive may be
too slow based on the bitrate, or
that other programs are accessing
the drive and consuming the data
throughput. For best results, use
the video drives only for recording
video.