User guide

DETEXI NVR 25 - 169
To include DETEXI Client bandwidth consumption in your calculation, you can use the following bandwidth
estimations for viewing to be added to your recording bandwidth calculations —
• Single camera view — 10 mbit/s
• Multi-camera view (2-4 cameras) — 10 mbit/s
• Multi-camera view (> 4 cameras) — 5 mbit/s
9 Bandwidth consumption should be considered for each Client license obtained for
the DETEXI NVR (simultaneous connections), in the event that the maximum
number of Clients allowed is connected at once.
9 The bandwidth consumption estimated for each Client should be based on the type
of viewing that will most likely occur on that workstation.
10. Compression
One of the key functions in the DETEXI NVR is recording video. The most processing resources are
required by recording. To address this, image and video compression techniques can be utilized to reduce
the bit rate. The goal is to reduce the amount of data as much as possible but, at the same time, have as
little an impact on the image and video quality as possible.
The current version (5.5) of the DETEXI NVR streams and records network video in Motion JPEG format.
Motion JPEG is a digital video sequence that is made up of a series of individual JPEG images.
9 One of the advantages of Motion JPEG is that each image in a video sequence can have the same
guaranteed quality that is determined by the compression level chosen for the network camera or
video encoder.
9 Since there is no dependency between the frames in Motion JPEG, a Motion JPEG video is robust,
meaning that if one frame is dropped during transmission, the rest of the video will not be affected.
DETEXI NVR 5.5 Encoder
The main disadvantage of Motion JPEG is that it makes no use of any video compression techniques to
reduce the data since it is a series of still, complete images. The result is that it has a relatively high bit
rate or low compression ratio for the delivered quality.
For this reason, configurable Encoder is available in the DETEXI NVR. When enabled, compression in
the NVR involves finding the difference between two images in the video stream and then applying a
compression algorithm.
9 By adjusting the Encoder settings, users can balance the recording file sizes and the video quality
necessary for their system and network cameras/video encoders.
9 Since the NVR encoding surely put an extra burden on the NVR’s processor it is used only in rare
situations. Today’s PC is able to run a video management software, and record and store video
from numerous cameras. If the hard disk on the actual server running the NVR is not enough, there
are solutions (such as network-attached storage — NAS) that enable you to increase storage space
Encoder Settings Template
Setting up encoder settings for many cameras with complicated recording schedules could be time
consuming. To make it easier a template enforcing particular settings in a newly created schedule can also