Milestone XProtect Enterprise 2014 Manuel d'utilisateur télécharger pdf (Page 58)

Milestone XProtect

Enterprise

2014

Administrator's Manual

www.milestonesys.com

Advanced configuration

 Audio recording affects video storage capacity. The system records audio to the associated

camera’s database. Therefore, it is important to bear in mind that the database is likely to

become full earlier if you record audio and video than if you only record video. The fact that the

database becomes full is not in itself a problem since your system automatically archives data

if the database becomes full. However, you may need additional archiving space if you record

audio.

o Example: If you use MPEG4, each one-second video GOP (Group Of Pictures) are stored

in one record in the database. Each second of audio is stored in one record in the

database. This reduces the database’s video storage capacity to half its capacity, because

half of the database’s records is used for storing audio. Consequently, the database runs

full sooner, and automatic archiving takes place more often than if you were only recording

video.

o Example: If you use MJPEG, audio is stored in one record for every JPEG for as long as

the audio block size does not exceed the time between the JPEGs. In extreme cases, this

reduces the database’s video storage capacity to half its capacity, because half of the

database’s records is used for storing audio. If you use very high frame rates, which

means less time between each JPEG, a smaller portion of the database is used for storing

audio records, and consequently a larger portion is available for storing video. The result is

that the database runs full sooner, and automatic archiving takes place more often than if

you were only recording video.

The above examples are simplified. The exact available video storage capacity also depends on

GOP/JPEG and audio kilobyte size.

About dedicated input/output devices

You can add a number of dedicated input/output (I/O) hardware devices to your system. For

information about which I/O hardware devices your system supports, see the release notes.

When you add I/O hardware devices, input on them can be used for generating events in your system

and events in your system can be used for activating output on the I/O hardware devices. This means

that you can use I/O hardware devices in your events-based system setup in the same way as a

camera.

With certain I/O hardware devices, the surveillance system must regularly check the state of the

hardware devices' input ports to detect whether input has been received. Such state checking at

regular intervals is called polling. The interval between state checks, called a polling frequency, is

specified as part of the general ports and polling properties (see "Ports and polling" on page 116). For

such I/O hardware devices, the polling frequency should be set to the lowest possible value (one tenth

of a second between state checks). For information about which I/O hardware devices require polling,

see the release notes.

About replacing hardware devices

If you need to, you can replace a hardware device that you have added and configured on your

system with a new one, for example to replace a physical camera on your network.

Open the Replace Hardware Device wizard (see "About the Replace Hardware Device wizard" on

page 60), which helps you through the entire replacement process on the surveillance system server,

including:

 Detecting the new hardware device

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Milestone XProtect Enterprise 2014 Manuel d'utilisateur Page 58

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