Axis 0874-001~EOL Axis Q3505-VE Mk II User Manual

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AXISQ3505-VEMkIINetworkCamera

VideoandAudio

Thefollowingsettingsareavailable:

•Resolution.Selectthedefaultresolution.

•Compression.Thecompressionlevelaffectstheimagequality,bandwidthandlesizeofsavedimages;thelowerthe

compression,thehighertheimagequalitywithhigherbandwidthrequirementsandlargerlesizes.

•Mirrorimage.Ifrequired,theimagecanbemirrored.

•Rotateimage.Ifrequired,theimagecanberotated.

•Maximumframerate.Toavoidbandwidthproblems,theframerateallowedtoeachviewercanbeLimitedtoaxed

amount.Alternatively,theframeratecanbesetasUnlimited,whichmeanstheAxisproductalwaysdeliversthehighest

frameratepossibleunderthecurrentconditions.

•Overlaysettings.SeeAboutoverlaytextonpage27.

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.

IfyousettheGOPlengthandtheframerateequallyyouwillgetoneGOPpersecond.IfyouchangetheGOPlengthtoahigher

valueyouwillgetmoresmallsizedP-framesandlessbigsizedI-frameswhilekeepingthesameframerate.Inotherwords,ahigh

GOP-lengthvaluesavesbandwidth,butthevideoqualitymaydecrease.AlowGOP-lengthvalueincreasesthevideoquality

butneedsmorebandwidth.

AboutH.264proles

TheAxisproductsupportsthefollowingH.264prole(s):

•Main:TheMainproleusesCABACandprovidesabettercompressionwithmaintainedvideoquality.Itrequiresalarger

amountofprocessingpowertodecodethantheBaselineprole.

•High:TheHighproleprovidesahighercompressionthanbothMainandBaselineproles,butrequiresmoreprocessing

powertodecode.Highprolesupports8x8blocks,whichreducesthebitratefurthercomparedtotheMainprole.

Aboutbitratecontrol

Bitratecontrolisusefultomakesurethevideostreamingdoesnottakeuptoomuchbandwidth.

Thebuilt-inbitratecontrolcanbecombinedwithZipstream,seeAboutZipstreamonpage22.Werecommendusingahighbitrate

limittoenablethefullpotentialofZipstream.

Aboutvariablebitrate

Variablebitrate(VBR)adjuststhebitrateaccordingtotheimagecomplexity.Whentheactivityinthesceneincreases,VBRadjusts

thebitrateaccordingtothecomplexity,usingupmorebandwidthforincreasedactivityinthescene,andlessforlowersceneactivity.

Variablebitrateissuitableifthereisasurplusinbandwidth,wheretheincreasedbitratemaynotbeanissue.

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Axis 0874-001~EOL Q3505-VE Mk II 3~9mm Outdoor Fixed Dome Network Camera - 0874-001