American Dynamics illustra 400 User Manual download pdf (Page 12)

VideoEdge NVR 4.1 Release Notes

8200-2735-07 D0

Viewing Video from MegaPixel Cameras

There is a significant increase in network bandwidth when using megapixel cameras over non-

megapixel cameras. Thus, when viewing video streams from megapixel cameras there is a

significant increase in resource usage (e.g. CPU, memory) on a system running the victor unified

client. To avoid any problems, the user should lower the number of streams being viewed when

megapixel cameras are used. Rule of thumb, for a system that supports 16 D1 video resolution

streams, the user should lower the number being viewed to no more than six (6) MegaPixel video

resolution streams.

ADEIP8H Encoder

For dual streaming, the ADEIP8H encoder must be setup as to per handler development

specifications or else heavy pixilation will occur;

 For the H.264 model, per each channel, you can have dual streaming of D1 @ 30fps and CIF

@ 7.5 fps.

 For the MPEG-4 model, per each channel, you can have dual streaming of D1 @ 30fps and

CIF @ 30 fps (or 2CIF @ 15fps)

Audio Support

The NVR Server 4.1 supports three audio codec (G.711, G.726, AAC). Each codec presents a

trade off with regard to the NVR audio fidelity and audio/video synchronization.

 G.711 codec is recommended if minimal latency between audio and video is the most

important criteria.

 ACC codec is recommended If very high audio quality is important (if it is supported by the

camera). However, synchronization will not be as good.

It is also important to point out that the quality of the network is critical for audio. Loss of an audio

packet can be much more noticeable than the corresponding loss of a video packet, therefore the

network needs to have sufficient bandwidth available and no sources of network errors (such as a

poor fiber connection).

In Tyco‟s testing,

 G.711 has been found to be the most reliable codec

 G.726 has been found to be the faster throughput (e.g. making lip sync marginally better), but

not as reliable

 ACC has been found to be the highest audio quality, but when selected with Axis cameras it

has an inherent delay affecting audio/video synchronization.

NOTE: Audio is only supported in the victor client. Audio is not supported by the NVR web client.

Maximum Limit of Motion Detection Alerts

The maximum number of alerts per day that the NVR server will log is set to 241,600. This limit

represents more than 1 alert every 15 seconds for 24 hours for 32 cameras (a daily limit of

184,320). As the number of recorded alert increases, the time required to display the Alerts page

will also increase. When the number of alerts is very large, 600 alert entries per page would

require approximately 40 seconds to load, while 8 pages with 32,000 entries each could take up

to a total of 50 minutes. It is also possible that when the number of alerts is very large, that the

flash file system could become near full.

Recommendation: If a user is experiencing anywhere near this many alerts, then either the

motion detection settings are too sensitive or the system should be using

continuous recording.

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American Dynamics illustra 400 User Manual Page 12

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