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Firmware User’s Manual V6.04.15

Compression

The section “Compression” allows the user to define the compression settings of

the video stream 1 and stream 2. The purpose of compression is to reduce the bandwidth and

VMS storage consumption.

Usually the stream 1 is configured to be the best quality stream for NVR recording purposes while

the stream 2 is configured to be with the basic quality for the live view of NVR, to minimize the

computing power of NVR used for video decoding.

Parameters

Description

Encoder Type

There are two encoder types available: H.264 (High Profile) and

MJPEG.

H.264 Profile

This item is available only if the Encoder Type is H.264.

The H.264 Profile defines the video compression scheme: High

Profile, Main Profile, and Baseline. These schemes vary from least

compressed, Baseline, to most compressed, High Profile. By

default, the H.264 Profile is High Profile, which provides the most

compression with the best video quality, but more computing power.

Some third-party video management system has longer latency or

takes more time to decode High Profile compression scheme, in this

case, you can select Main Profile or Baseline. In order to get the

same video quality, you can select a higher bit rate with lower

compression; this is the same as having a lower bit rate with a High

Profile. For example, a video on High Profile with 2M bit rate will have

the same video quality as a video with Baseline Profile at 3.5M bit

rate.

VGA Aspect Ratio

It is used to define the aspect ratio of VGA stream – it can be either

4:3 ratio (640x480) or 16:9 ratio (640x360). When “Auto Detected” is

chosen, the VGA stream will follow the ratio of the higher resolution

stream, to ensure the identical view of stream 1 and stream 2.

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ACTi E31 Manual do Utilizador Página 41