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SerVision Embedded Video Gateway System Guide

Configuring Camera Settings 96

Field

Description

Note: Preset locations are defined and assigned numbers using a client application such

as the MultiClient. For additional information, please refer to the relevant client application

guide.

Note: If no PTZ cameras are connected to the unit, this field does not appear.

2. Under On Video Restored, select the actions that the Video Gateway should perform when a video-lost event

ends – when the Video Gateway begins to receive a video signal from the camera again – as described above.

Video Recording Settings

The Video Gateway can record a video stream from each camera connected to it. Each stream is called a “recorder.”

Creating a recorder allocates space on the storage media of the Video Gateway unit for the video stream that is to be

recorded. Recorded video can be downloaded from the storage media for viewing and saving on the client or for

viewing on a CCTV monitor (when touch/mouse is enabled).

The available space on the storage media limits how much disk space can be allocated for each recorder. You can

choose what should be done when the disk space allocated for a recorder is used up: either the earliest part of the

recording is discarded and overwritten by the current recording, or recording stops until you erase the recordings

manually.

Video can be recorded continuously or only when triggered by events. Event-triggered recording can be used to

minimize disk usage, so that more time can be covered by a recorder before its allocated disk space is used up. For

example, a second of high-quality recording requires about 16 KB of disk space. For a full day of high-quality video

recording, this translates into 1.3 GB of disk space. By contrast, if there are 25 events in a day, and the recorder

records 20 seconds for each event, only 8 MB of disk space are needed for the day.

VMD, sensor, and activator events can function as triggers for event-triggered recording. Each recorder can be

configured to respond to VMD events detected by the camera from which the recorder records or from any of the

sensors connected to the Video Gateway.

When an event occurs, it is often useful to see what happened immediately before and after it. For this reason,

event-triggered recording can be configured to record a set number of seconds before and after each event (“pre-

record” and “post-record”). To accomplish this, the Video Gateway always records the specified number of pre-

record seconds, and then discards this data if no events are detected. For example, if the pre-record is five seconds,

the system always stores the last five seconds of video. If an event is detected, this video is saved as the pre-record

recording. Otherwise, it is deleted. The total recording time for each event is the sum of the pre-record time, the

time of the event itself, and the post-record time.

Another way you can control the disk usage is through the recording quality settings. The system supports three

standard quality levels, high, medium, and low. The lower the quality setting, the less disk space is required for

each second of recording. Obviously, some stream quality is lost when lower quality settings are used. All three

standard quality settings produce recordings in SIF size when the unit’s video resolution is VGA and recordings in

CIF size when the video resolution is D1 (see Video Resolution, page 19). High quality is the optimal recording

configuration, and is recommended for use whenever possible. For information about the framerates and bitrates

used for the standard quality levels, see Advanced Recorder Settings, page 97.

Configuring Video Recording

This section explains how to configure video recording settings for a camera.



To set up video recording for a camera:

1. In the Camera configuration screen, under Recording Type, select the desired type of recording, as follows:



Continuous: Recording takes place all the time, regardless of whether events occur or not



By Event: Recording only takes place when an event occurs

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