Vivotek 3GPP User Manual download pdf (Page 60)

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60 - User's Manual

■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, and 8Mbps. You can also select Customize and manually

enter a value.

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.

If JPEGmodeisselected,theNetworkCameracontinuouslysendsJPEGimagestotheclient,producing

a moving effect similar to a filmstrip. Every single JPEG image transmitted guaranteesthesame

imagequality,whichinturncomes at the expenseofvariablebandwidthusage. Because themedia

contentsareacombinationofJPEGimages,noaudiodataistransmittedtotheclient.Therearethree

parametersprovidedinMJPEGmodetocontrolthevideoperformance:

■Framesize

Youcansetup different videoresolution fordifferent viewingdevices.For example, setasmaller

frame size and lower bit rate for remote viewing on mobile phones and a larger video size and a higher

bit rate for live viewing on web browsers. Note that a larger frame size takes up more bandwidth.

■Maximumframerate

Thislimitsthemaximumrefreshframeratepersecond.Settheframeratehigherforsmoothervideo

quality.

■Videoquality

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.

NOTE

►

Videoquality and fixed qualityrefersto the compression rate, so a lower value will produce higher

quality.

►

Converting high-quality video may significantly increase the CPU loading, and you may encounter

streaming disconnection or video loss while capturing a complicated scene. In the event of occurance,

we suggest you customize a lower video resolution or reduce the frame rate to obtain smooth video.

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Vivotek 3GPP User Manual Page 60