Axis 0690-001~EOL Axis P1365 User Manual

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AXISP1365NetworkCamera

VideoandAudio

•Compression.Thecompressionlevelaffectstheimagequality,bandwidthandlesizeofsavedimages;thelowerthe

compression,thehighertheimagequalitywithhigherbandwidthrequirementsandlargerlesizes.

•Mirrorimage.Ifrequired,theimagecanbemirrored.

•Rotateimage.Ifrequired,theimagecanberotated.

•Maximumframerate.Toavoidbandwidthproblems,theframerateallowedtoeachviewercanbeLimitedtoaxed

amount.Alternatively,theframeratecanbesetasUnlimited,whichmeanstheAxisproductalwaysdeliversthehighest

frameratepossibleunderthecurrentconditions.

•Overlaysettings.SeeOverlayonpage27.

ClickSavetoapplythenewsettings.

H.264

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

AnH.264videostreamconsistsofdifferenttypesofframessuchasI-framesandP-frames.AnI-frameisacompleteimagewhereas

P-framesonlycontainthedifferencesfrompreviousframes.

TheH.264streamsettingscanbeconguredfromtheVideo&Audio>VideoStreampage.SelecttheH.264tab.Thesettings

denedinthispagewillapplytoallH.264streamsthatdonotuseastreamprole.

TheGOVlengthisthenumberofframesbetweentwoconsecutiveI-frames.IncreasingtheGOVlengthmaysaveconsiderablyon

bandwidthrequirementsinsomecases,butmayalsohaveanadverseaffectonimagequality.

TheAxisproductsupportsthefollowingH.264prole(s):

•Baseline.TheBaselineproleisrecommendedforclientsthatdon’tsupportCABACentropycoding.

•Main.TheMainproleprovideshighercompressionwithmaintainedvideoqualitycomparedtotheBaselineprolebut

requiresmoreprocessingpowertodecode.

•High.TheHighproleprovidesreducedbitrateandhighercompressionwithmaintainedvideoqualitycomparedtothe

Mainprolebutrequiresmoreprocessingpowertodecode.

ThebitratecanbesetasVariablebitrate(VBR)orConstantbitrate(CBR).VBRadjuststhebitrateaccordingtotheimage

complexity,usingupmorebandwidthforincreasedactivityintheimage,andlessforlowerimageactivity.Whentheactivityin

thesceneincreases,thebitratewouldusuallyincreaseaswell.Ifthereisasurplusinbandwidth,thismaynotbeanissueand

selectingVariablebitrate(VBR)willbesufcient.Butifbandwidthislimited,itisrecommendedtocontrolthebitratebyselecting

Constantbitrate(CBR).Whentheactivityinthesceneincreases,VBRadjuststhebitrateaccordingtothecomplexity,usingup

morebandwidthforincreasedactivityinthescene,andlessforlowersceneactivity.CBRallowsyoutosetatargetbitratethat

limitsthebandwidthconsumption.

TheCBRtargetbitrateworksliketheceilingofatent.Itlimitsthebitrate,whilemaintainingsomeexibility.Thebitratemaybounce

upanddownwithinthesettargetbutwhenitnearsthesettargetvalue,thelimitationkicksin.However,becauseCBRwillalways

prioritizeacontinuousvideostream,itallowstemporaryovershootsfromthetargetbitrate.Becausesettingatargetvalueprevents

thebitratefromincreasing,framerateandimagequalityareaffectednegatively.Topartlycompensateforthis,selectwhichvariable

shallbeprioritized,framerateorimagequality.Notsettingaprioritymeansthatframerateandimagequalityareequallyaffected.

Thecurrentbitratecanbesettoappearastextoverlay.UnderOverlaySettings,selectIncludetextandenterthemodier

#bintheeld.

Toapplythesettings,clickSave.

Axis’ZipstreamTechnology

Zipstreamisabitratereductiontechnologyoptimizedforvideosurveillance.ZipstreamreducestheaveragebitrateintheH.264

streambyremovingunnecessarydataandmakesitpossibletoallowhigherresolutions,reducestoragecostortokeeprecordingsfor

alongertime.Toreducethebitrate,Zipstreamreducesthenumberofbitsintheareasoftheimagethatarelessinterestingfroma

videosurveillanceperspective,forexamplethebackground.Imagedetailsthatareimportantforforensicvideoanalysis,forexample

facesandlicenseplates,arepreservedwithenoughnumberofbits.

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Axis 0690-001~EOL P1365 2 Megapixel Fixed Network Camera 0690-001

Axis P1365 User Manual - Page 22