DS2 Setup Guide

DS2

MPEG Prole Parameters

Prole

This identies the prole that is being congured and can not be changed.

Description

It is possible to allocate a description to each of the proles to allow the Operator to easily identify

the selected prole, use information that is relevant to the settings.

Image size

This identies the pre-congured image size for the MPEG prole being congured and can not be

edited.

MPEG Quality

NOTE: It is recommended that this setting be left at the default Constant Bit Rate. Selecting any

other setting is for specialist conguration and could result in high bit rate throughput which

would require high storage requirements or low quality recorded images and should be

carefully congured and tested. The highest MPEG quality setting is 02, decreasing in steps

to 31, the lowest quality setting. This offers a wide range of quality settings.

Select the MPEG quality that will be associated with this prole, the options are:

Constant Bit Rate (default) Recommended. Sets the recording bit rate to a constant making

the record duration predictable.

High 02 - High 12 High quality settings providing high quality recorded images but

would also produce larger storage requirements.

Medium 13 - Medium 22 Medium quality images with average storage requirements.

Low 23 - Low 31 Lower quality images but reduces the data and therefore the

storage requirements.

MPEG Bitrate

This option is active when Constant Bit Rate is selected in the MPEG Quality option. Set the bit rate

in Kbits/s, this can be from 8Kbits/s to 8192Kbits/s.

Record Rate

This identies the record rate for the selected prole and can be from 01 PPS to 25PPS (30PPS

NTSC).

I-Frame Interval

MPEG-4 compression uses I and P frames. MPEG recording uses a ‘reference’ frame at a

designated interval, called an I-Frame, and then records the difference between that frame and the

next image. This reduces the amount of space required for storing video. The image can deteriorate

if this interval is too great. The I-frame interval is the period between the ‘reference’ frames.

This option allows the system administrator to determine how often the I-frame will be recorded

within the selected prole.