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Encoding Parameters: Each video feed of the DVR is
comprised of two components, the Main Stream and the
SubStream.
Both the Main Stream and the SubStream are always active -
you don't have to choose one for the DVR to use as it's always
using both. You can, however, change the quality, size and
types of compression used for either.
Camera: Select a camera that you would like to alter.
Main Stream: The images you'll see in the live-view interface
of the DVR. This is the higher quality of the two streams, and is
what you'll see on the DVR itself or via a local network. You can
alter settings for both Normal and Event recording, and it is
recommended to select the same settings for both recording
types.
Stream Type: What kind of data you want the stream to
contain. The cameras included with the DVR stream video
only.
Resolution: Select a resolution, up to the native resolution
of your camera. The higher the resolution, the more potential
detail there will be in your images. The higher your resolution,
the higher the bitrate will need to be to maintain a level of
detail per-pixel.
Frame Rate: The number of frames per second (fps) that the
DVR will record. The default (and maximum) is referred to as
"real-time" and is 30fps (NTSC) or 25fps (PAL).
Video Quality: The actual amount of data the DVR will use to
record video.
Pre-record: While Pre-record is enabled, the DVR will record
between X and Y seconds before an event occurs. It's a little
like making the DVR psychic (but not really - it's actually
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Record: Encoding
just caching a few seconds of video which it adds to event
recordings as they occur).
If you're using Motion Detection (recommended) and/or
Alarm based recording as your primary recording method(s),
then it's a really good idea to use Pre-record - sometimes, if an
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; having Post-record enabled will get a
much better look at them. 30 seconds is the recommended
length for the Post-record setting, but it can be set higher (the
options are 5 seconds, 10 seconds, 30 seconds, 60 seconds,
120 seconds, 300 seconds, 600 seconds) depending on your
unique circumstances.
Expired Time (day): Determines how long the video footage
will remain on the hard drive without it being overwritten. The
default value 0, instructs the DVR to auto overwrite.
Record Audio (check-box): Whether the DVR will record
audio from this camera. The camera must contain a compatible
audio device for this option to be selectable.
Substream: A fraction of the Main Stream, and what you'll
see over the Internet or via a mobile device. Typically, the
Substream will be of significantly lower quality and bitrate
than the main stream.
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