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![](https://files.manualsfile.com/3093414-m2035-le-white/bg27.png)
AXISM20BulletCameraSeries
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Privacymasks
Aprivacymaskisauser-denedareathatpreventsusersfromviewingapartofthemonitoredarea.Inthevideostream,privacy
masksappearasblocksofsolidcolor.
You’llseetheprivacymaskonallsnapshots,recordedvideo,andlivestreams.
YoucanusetheVAPIX®applicationprogramminginterface(API)toturnofftheprivacymasks.
Important
Ifyouusemultipleprivacymasksitmayaffecttheproduct’sperformance.
Overlays
Overlaysaresuperimposedoverthevideostream.Theyareusedtoprovideextrainformationduringrecordings,suchasatimestamp,
orduringproductinstallationandconguration.Youcanaddeithertextoranimage.
Pan,tilt,andzoom(PTZ)
Guardtours
Aguardtourdisplaysthevideostreamfromdifferentpresetpositionseitherinapredeterminedorrandomorder,andforcongurable
periodsoftime.Oncestarted,aguardtourcontinuestorununtilstopped,evenwhentherearenoclients(webbrowsers)viewingthe
images.
Streamingandstorage
Videocompressionformats
Decidewhichcompressionmethodtousebasedonyourviewingrequirements,andonthepropertiesofyournetwork.The
availableoptionsare:
MotionJPEG
MotionJPEG,orMJPEG,isadigitalvideosequencethatismadeupofaseriesofindividualJPEGimages.Theseimagesarethen
displayedandupdatedataratesufcienttocreateastreamthatshowsconstantlyupdatedmotion.Fortheviewertoperceivemotion
videotheratemustbeatleast16imageframespersecond.Fullmotionvideoisperceivedat30(NTSC)or25(PAL)framespersecond.
TheMotionJPEGstreamusesconsiderableamountsofbandwidth,butprovidesexcellentimagequalityandaccesstoeveryimage
containedinthestream.
H.264orMPEG-4Part10/AVC
Note
H.264isalicensedtechnology.TheAxisproductincludesoneH.264viewingclientlicense.Toinstalladditionalunlicensed
copiesoftheclientisprohibited.Topurchaseadditionallicenses,contactyourAxisreseller.
H.264can,withoutcompromisingimagequality,reducethesizeofadigitalvideolebymorethan80%comparedtotheMotion
JPEGformatandbyasmuchas50%comparedtoolderMPEGformats.Thismeansthatlessnetworkbandwidthandstoragespace
arerequiredforavideole.Orseenanotherway,highervideoqualitycanbeachievedforagivenbitrate.
H.265orMPEG-HPart2/HEVC
H.265can,withoutcompromisingimagequality,reducethesizeofadigitalvideolebymorethan25%comparedtoH.264.
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