Axis 01089-001 - Page 18

XF40-Q2901Explosion-ProtectedTemperatureAlarmCamera
Aboutvideosettings
6.ClickSave.
Howtoincludecurrentbitrateinatextoverlay
1.GotoVideo>VideoStream>OverlaySettings.
2.IntheIncludetexteldenter#b.
3.ClickSave.
AboutZipstream
Axis’ZipstreamTechnologyisabitratereductiontechnologyoptimizedforvideosurveillance.Zipstreamreducestheaveragebitrate
intheH.264streambyremovingunnecessarydata,whichmakesitpossibletostreamhigherresolutions,reducestoragecost
orkeeprecordingsforalongertime.
Toreducetheaveragebitrate,Zipstreamreducesthebitrateinareasoftheimagethatarelessinterestingfromavideosurveillance
perspective,forexamplethebackground.Imagedetailsthatareimportantforforensicvideoanalysis,forexamplefacesand
licenseplates,areencodedwithahigherbitrate.
Axis’ZipstreamTechnologyforH.264conformstotheH.264standardandiscompatiblewiththird-partyclientsandVMSsolutions
thatdecodeH.264video.
Recommendeduseofbitratereduction
Zipstreamoffersanumberofbitratereductionpresets,fromLowtoExtreme.Lowbitratereductionisenabledbydefaultandis
safetouseinallapplicationswhilestillreducingthebitrate.
WerecommendusingtheExtremebitratereductiontomaximizestoragetimeforcloud-connectedcamerasorcamerasusingedge
storage.Thissettingissuitabletocombinewithmotiondetectiontriggeringandvariablebitrate(VBR)wherethebitrateisallowed
toadapttochangesincomplexityinthescene.
HowtosavebandwidthandstorageusingZipstream
ThebitratecontrollerbuiltintotheproductcanbecombinedwithZipstreamtoensureamaximumbitrate(MBR)limit.We
recommendusingVBRorMBRwithahighbitratelimittoenablethefullpotentialofZipstream.Forinstanceinrailwaysurveillance
whereattimesthereisalotofmovementinthesceneandwhereitisimportanttocapturedetails,suchasfacialfeatures,theMBR
shouldbesetto10Mbit/s(for1080presolutionat30fps).
TofurthersavebandwidthgotoSetup>Video>VideoStreamanddooneormoreofthefollowing:
•GototheImagetabandsetalowMaximumframeratevalue.
•GototheH.264tabandsetahighGOPlengthvalue.
•GototheZipstreamtabandselectExtremeH.264bitratereduction.
•GototheZipstreamtab.EnableDynamicGOPandsetahighMaxdynamicGOPlengthvalue.
Alwaysverifythatthevideostreammeetsthequalityrequirementsforyoursurveillancepurposesafterchangingthevideostream
settings.
AboutMJPEGsettings
Sometimestheimagesizeislargeduetolowdynamicorcomplexscenery.Adjustingthemaximumframesizehelpstocontrolthe
bandwidthandstorageusedbytheMotionJPEGvideostreaminthesesituations.SettingtheframesizetotheDefaultsetting
providesconsistentlygoodimagequalityattheexpenseofincreasedbandwidthandstorageusageinlowdynamic.Limitingthe
framesizeoptimizesbandwidthandstorageusage,butmayresultinpoorimagequality.
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