Axis P1245 - About Stream Profiles

AXISP1245NetworkCamera
Aboutvideosettings
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.
Forinstanceinrailwaysurveillancewhereattimesthereisalotofmovementinthesceneandwhereitisimportanttocapture
details,suchasfacialfeatures,theMBRshouldbesetto10Mbit/s(for1080presolutionat30fps).
TofurthersavebandwidthgotoSetup>Video>VideoStreamanddooneormoreofthefollowing:
•GototheImagetabandsetalowMaximumframeratevalue.
•GototheH.264tabandsetahighGOPlengthvalue.
•GototheZipstreamtabandselectExtremeH.264bitratereduction.
•GototheZipstreamtab.EnableDynamicGOPandsetahighMaxdynamicGOPlengthvalue.
•GototheZipstreamtabandenableDynamicFPS.
Alwaysverifythatthevideostreammeetsthequalityrequirementsforyoursurveillancepurposesafterchangingthevideostream
settings.
AboutMJPEGsettings
Sometimestheimagesizeislargeduetolowlightorcomplexscenery.Adjustingthemaximumframesizehelpstocontrolthe
bandwidthandstorageusedbytheMotionJPEGvideostreaminthesesituations.SettingtheframesizetotheDefaultsetting
providesconsistentlygoodimagequalityattheexpenseofincreasedbandwidthandstorageusageinlowlight.Limitingtheframe
sizeoptimizesbandwidthandstorageusage,butmayresultinpoorimagequality.
Aboutstreamproles
Astreamproleisasetofpredenedstreamsettingsincludingresolution,compression,framerateandoverlaysettings.Stream
prolescanbeused:
•Whensettinguprecordingusingactionrules.SeeAbouteventsonpage25.
•Whensettingupcontinuousrecording.SeeAboutcontinuousrecordingonpage30.
•IntheLiveViewpage–selectthestreamprolefromtheStreamproledrop-downlist.
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