Axis P3915-R Mk II - Page 17

AXISP3915-RMkIINetworkCamera
VideoandAudio
•Rotateimage.Ifrequired,theimagecanberotated.
•Maximumframerate.Toavoidbandwidthproblems,theframerateallowedtoeachviewercanbeLimitedtoaxed
amount.Alternatively,theframeratecanbesetasUnlimited,whichmeanstheAxisproductalwaysdeliversthehighest
frameratepossibleunderthecurrentconditions.
•Overlaysettings.SeeAboutoverlaytextonpage21.
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-framesandfewerlarge-sizedI-frameswhilekeepingthesameframerate.Inotherwords,ahighGOP-lengthvaluesaves
bandwidth,butthevideoqualitymaydecrease.AlowGOP-lengthvalueincreasesthevideoqualitybutrequiresmorebandwidth.
AboutH.264proles
TheAxisproductsupportsthefollowingH.264prole(s):
•Baseline:UsetheBaselineproleiftheclientdoesnotsupportCABACentropycoding.
•Main:TheMainproleusesCABACandprovidesabettercompressionwithmaintainedvideoquality.Itrequiresalarger
amountofprocessingpowertodecodethantheBaselineprole.
Aboutbitratecontrol
Bitratecontrolisusefultomakesurethevideostreamingdoesnottakeuptoomuchbandwidth.
Thebuilt-inbitratecontrolcanbecombinedwithZipstream,seeAboutZipstreamonpage18.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&Audio>VideoStream>H.264.
2.ToincreaseordecreasethenumberofframesperGOP,settheGOPlength.
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