Axis 0942-001 ~ EOL Axis Q6055-C User Manual

Loading ...

AXISQ6055-CPTZNetworkCamera

Aboutvideosettings

•Overlaysettings.SeeAboutoverlaytextonpage23.

ClickSavetoapplythenewsettings.

AboutH.264

H.264,alsoknownasMPEG-4Part10/AVC,isavideocompressionstandardthatprovideshighqualityvideostreamsatlowbitrates.

AnH.264videostreamconsistsofdifferenttypesofframessuchasI-framesandP-frames.AnI-frameisacompleteimage,whereas

P-framesonlycontainthedifferencesfrompreviousframes.

AboutGOPlength

AGroupofPictures(GOP)containsoneI-framefollowedbyanumberofP-frames.TheGOPlengthisthenumberofframes

betweentwoI-frames.

EqualvaluesforGOPlengthandframerateresultinoneGOPpersecond.AhigherGOPlengthvalueresultsinmoresmall-sized

P-framesandlessbig-sizedI-frameswhilekeepingthesameframerate.Inotherwords,ahighGOP-lengthvaluesavesbandwidth,

butthevideoqualitymaydecrease.AlowGOP-lengthvalueincreasesthevideoqualitybutrequiresmorebandwidth.

AboutH.264proles

TheAxisproductsupportsthefollowingH.264prole(s):

•Baseline:UsetheBaselineproleiftheclientdoesnotsupportCABACentropycoding.

•Main:TheMainproleusesCABACandprovidesabettercompressionwithmaintainedvideoquality.Itrequiresalarger

amountofprocessingpowertodecodethantheBaselineprole.

•High:TheHighproleprovidesahighercompressionthanbothMainandBaselineproles,butrequiresmoreprocessing

powertodecode.Highprolesupports8x8blocks,whichreducesthebitratefurthercomparedtotheMainprole.

Aboutbitratecontrol

Bitratecontrolisusefultomakesurethevideostreamingdoesnottakeuptoomuchbandwidth.

Thebuilt-inbitratecontrolcanbecombinedwithZipstream,seeAboutZipstreamonpage20.Werecommendusingahighbitrate

limittoenablethefullpotentialofZipstream.

Aboutvariablebitrate

Variablebitrate(VBR)adjuststhebitrateaccordingtotheimagecomplexity.Whentheactivityinthesceneincreases,VBRadjusts

thebitrateaccordingtothecomplexity,usingupmorebandwidthforincreasedactivityinthescene,andlessforlowersceneactivity.

Variablebitrateissuitableifthereisasurplusinbandwidth,wheretheincreasedbitratemaynotbeanissue.

Aboutmaximumbitrate

Ifyouhavelimitedbandwidth,werecommendMaximumbitrate(MBR).MBRallowsyoutosetatargetbitratetocontrolthe

bandwidthconsumption.Thetargetvaluelimitsthebitrate,butitmaintainsaexibilitytobeabletoprioritizeacontinuousvideo

stream.Consequently,theframeratemightneedtogodownandtheimagequalitymightdecrease.Topartlycompensateforthis,

youcanselectwhichvariableshallbeprioritized.Notsettingaprioritymeansthatframerateandimagequalityareequallyaffected.

HowtosetanH.264prole

1.TochangethesettingsforallH.264streamsthatdonotuseastreamprole,gotoVideo>VideoStream>H.264.

2.ToincreaseordecreasethenumberofframesperGOP,settheGOPlength.

3.SelectoneoftheH.264proles.

4.Selectoneofthefollowing:

Loading ...

Axis 0942-001 ~ EOL Q6055-C PTZ Dome Network Camera 0942-001