ACTi I51 User Manual download pdf (Page 64)

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Firmware User’s Manual V6.08.30

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.

Resolution

Depending on the camera model, the number of available resolutions

may be different. The default resolution setting of the camera may not

necessarily be the maximum resolution of the camera. If the user

wants to use the maximum resolution, it is possible to do it here. The

maximum possible resolution of the stream 2 will be smaller than

stream 1.

Frame Rate

Defines the amount of frames per second.

Video Bit Rate Mode

(only for H.264)

Under “Constant Bit Rate” mode (CBR), the camera keeps the stable

bitrate regardless of the complexity of the scene. Under this mode,

the video quality may vary if the bit rate value is set too low. It is easier

to do storage and network bandwidth consumption estimations under

this mode compared to Variable Bit Rate mode.

Under “Variable Bit Rate” mode (VBR), the camera will keep the video

quality stable while the bit rate may occasionally go up or down,

depending on the complexity of the scene.

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ACTi I51 User Manual Page 64

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