Network Video Recorder User Manual 173
Other Settings
Understanding camera capacity in an NVR
When setting up your NVR and cameras, you may notice that some of the
camera images may not display in Live View. This most often occurs when you
are displaying images in 1 Plus5 mode or 1 Plus7 mode, because the total bit
rate for all cameras is exceeding the NVR’s capacity. The actual capacity
depends on the total bit rate from all the cameras. However, it is good practice to
allow some headroom for machine operations, such as remote streaming.
To fully understand NVR capacity, it is necessary to understand the concepts of
streaming video, resolution, quality, and bit rate. Streaming video is content sent
in a compressed form over a network and processed in real time.
Streaming video types
• Main Stream: the high quality video that is recorded and streamed.
• Sub Stream: never recorded; intended for streaming only. Default is
704 × 480, 584 Kbps at 8 fps.
• Is video alone, or video and audio compressed together. Audio requires very
little bandwidth.
The combination of the main stream and sub streams makes up the total bit rate
of each camera. This is expressed in Kbps (kilobits per second) or Mbps
(megabits per second).
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