Axis P7304 - General Stream Settings; H.26 x Encoding Features; H.264 Profile Selection

AXISP7304VideoEncoder
Thedeviceinterface
Stream
General
Resolution:Selecttheimageresolutionsuitableforthesurveillancescene.Ahigherresolutionincreasesbandwidthandstorage.
Framerate:Toavoidbandwidthproblemsonthenetworkorreducestoragesize,youcanlimittheframeratetoaxedamount.
Ifyouleavetheframerateatzero,theframerateiskeptatthehighestpossiblerateunderthecurrentconditions.Ahigher
frameraterequiresmorebandwidthandstoragecapacity.
Compression:Usetheslidertoadjusttheimagecompression.Highcompressionresultsinalowerbitrateandlowerimagequality.
Lowcompressionimprovestheimagequality,butusesmorebandwidthandstoragewhenyourecord.
Signedvideo:Turnontoaddthesignedvideofeaturetothevideo.Signedvideoprotectsthevideofromtamperingbyadding
cryptographicsignaturestothevideo.
H.26xencoding
Zipstream:Abitratereductiontechnology,optimizedforvideosurveillance,thatreducestheaveragebitrateinanH.264orH.265
streaminrealtime.AxisZipstreamappliesahighbitrateinsceneswheretherearemultipleregionsofinterest,forexamplein
sceneswithmovingobjects.Whenthesceneismorestatic,Zipstreamappliesalowerbitrate,andtherebyreducestherequired
storage.Tolearnmore,seeReducingthebitratewithAxisZipstream
Selectthedesiredlevelofbitratereduction:
•Off:Nobitratereduction.
•Low:Novisiblequalitydegradationinmostscenes.Thisisthedefaultoptionanditcanbeusedinalltypes
ofscenestoreducethebitrate.
•Medium:Visibleeffectsinsomescenesthroughlessnoiseandaslightlylowerlevelofdetailinregionsoflower
interest,forexamplewherethere’snomovement.
•High:Visibleeffectsinsomescenesthroughlessnoiseandalowerlevelofdetailinregionsoflowerinterest,
forexamplewherethere’snomovement.Werecommendthislevelforcloud-connecteddevicesanddevicesthat
uselocalstorage.
•Higher:Visibleeffectsinsomescenesthroughlessnoiseandalowerlevelofdetailinregionsoflowerinterest,
forexamplewherethere’snomovement.
•Extreme:Visibleeffectsinmostscenes.Thebitrateisoptimizedforsmallestpossiblestorage.
DynamicFPS(framespersecond):Turnontoallowthebandwidthtovarybasedonthelevelofactivityinthescene.More
activityrequiresmorebandwidth.
Lowerlimit
:Enteravaluetoadjusttheframeratebetweenminimalfpsandthestreamdefaultfpsbasedonscene
motion.Werecommendyoutouselowerlimitinsceneswithverylittlemotion,wherethefpscoulddropto1orlower.
DynamicGOP(GroupofPictures):TurnontodynamicallyadjusttheintervalbetweenI-framesbasedonthelevelofactivity
inthescene.
Upperlimit:EnteramaximumGOPlength,thatis,themaximumnumberofP-framesbetweentwoI-frames.
P-frames:EnterthedesirednumberofP-frames.Thehigherthenumber,thelessbandwidthisrequired.However,ifthereare
networkcongestion,therecouldbeanoticeabledeteriorationinthevideoquality.
H.264prole:
•Baseline
:Useifthevideomanagementclientdoesn’tsupportCABACentropycoding.
•Main:UseifthevideomanagementclientsupportsCABACentropycoding,toachievehighercompressionwith
maintainedvideoquality.Itrequiresmoreprocessingpowertodecodecomparedtothebaselineprole.
•High:UseifthevideomanagementclientsupportsCABACentropycoding,toachieveevenhighercompressionthan
withthemainprole.Itrequiresmoreprocessingpowertodecodecomparedtothemainprole.
Bitratecontrol:
17