Vivotek FE8172 User Manual download pdf (Page 61)

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User's Manual - 61

■ Intra frame period

Determine how often to plant an I frame. The shorter the duration, the more likely you will get better

video quality, but at the cost of higher network bandwidth consumption. Select the intra frame period

from the following durations: 1/4 second, 1/2 second, 1 second, 2 seconds, 3 seconds, and 4 seconds.

■ Video quality

A complex scene generally produces a larger le size, meaning that higher bandwidth will be needed

for data transmission. Therefore, if Constant bit rate is selected, the bandwidth utilization is xed at

a selected level, resulting in mutable video quality performance. The bit rates are selectable at the

following rates: 20Kbps, 30Kbps, 40Kbps, 50Kbps, 64Kbps, 128Kbps, 256Kbps, 512Kbps, 768Kbps,

1Mbps, 2Mbps, 3Mbps, 4Mbps, 6Mbps, 8Mbps, 10Mbps, 12Mbps, 14Mbps, and 16Mbps. You can also

select Customize and manually enter a value.

Bit rate restriction: The bit rate conguration is characterized either by the Average or the Upper

bound approaches: the target bit rate utilized can be uctuating around an average bit rate value or

using the bit rate value as an Upper bound threshold.

Policy: You may select Frame rate priority or Image quality priority. The rmware dynamically controls

bit rate and image quality to maintain the frame rate. If quality priority is selected, frame rate will be

slightly compromized.

On the other hand, if Fixed quality is selected, all frames are transmitted with the same quality;

bandwidth utilization is therefore unpredictable. The video quality can be adjusted to the following

settings: Medium, Standard, Good, Detailed, and Excellent. You can also select Customize and

manually enter a value.

SVC

The SVC (Scalable Video Coding) feature enables streaming of videos for multiple clients from

one single set of layered IP packets. Designed for saving bandwidth and CPU load on client

stations, the frame rate of a video stream appearing through a view cell can be individually

adjusted. This feature applies when an administrator experiences unstable video streaming due

to the lack of network bandwidth, less-than-ideal hardware, or during an occurence of network

problems.

VIVOTEK's VAST server (rev. 1.6.1 and later) automatically negotiates with a camera and

determines whether a network camera comes with the SVC feature. The SVC checkbox appears

if the network camera supports the feature. The same checkbox also appears in the Batch Insert

Cameras window. Note that the maximum frame rate varies with different cameras.

The rest of the video conguration options in the SVC column is identical to that of the H.264

protocol.

VAST Server

Notebook

3G Cell Phone

Client PC

5fps

25fps

30fps

LAN

NVR Storage

60fps

LAN/WAN

SVC Packet

Stream

on Demand

Stream

on Demand

Stream

on Demand

Stream

on Demand

Network Camera

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Vivotek FE8172 User Manual Page 61

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