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Overwrite: When enabled, the DVR will record over the les
already stored on the hard drive. The DVR will always record
over the oldest les on your hard drive rst.
Using the overwrite option is advisable, as the DVR will always
be able to record events as they happen. However, it does
mean that you’ll need to get important events o the HDD
before they’re overwritten.
Pre-Record: While Pre-Record is enabled, the DVR will record
a few seconds before an event occurs. It’s a little like making
the DVR psychic (but not really - it’s actually just caching a few
seconds of video which it adds to event recordings as they
occur).
If you’re using Motion Detection (recommended) as your
primary recording method, then it’s a really good idea to use
Pre-Record - sometimes, if a motion event is fast enough, it
might have left view before the DVR can trigger a recording.
With Pre-Record, there’s almost no chance you’ll miss it.
Post-Record: How long after an event occurs that the DVR
will continue to record. It can be very useful - for example, if
an intruder or potential target triggers the motion detection
but pauses in view, then post record being enabled will get
a much better look at them. We think that 30 seconds is a
reasonable length for the post-record setting, but can be
higher (the options are 1, 2, 5 or 10 minutes) depending on
your unique circumstances.
Pack Duration: Pack Duration is a measurement of how long
the DVR will record for before splitting the output le into
discrete units. “Packs” are something like the scene numbers
on a DVD - though the video is broken up into separate units,
it will still play through as one continuous movie (unless
interrupted by the schedule or motion detection turning the
recording on or o). If you don’t want to worry about setting
Pack Durations, you can leave it on the default value; it will
make little dierence to the day-to-day running of the DVR.
Recording: Option
The Recording: Encode menu allows to
alter and customize how the DVR records
footage and “encodes” the les.
“Encoding” is a term which refers to
the compression algorithm (a fancy,
computer term for “make the le smaller
while retaining visual quality”) used by
the DVR.
You can choose and alter:
t the resolution (per channel),
t the frame rate (how many images
per second the DVR records) and
t the data-rate of each video steam.
The higher the data rate, the “better”
your images will look, but the more
space they’ll require on your HDD.
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