Specifications

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Zv‐Cliv1_1www.zeevee.com  Page15of26
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ThevaluessentfollowMPEG2and CEA‐766specification,region1(USA),dimension0(TV‐Rating).Notethat
TV‐MA‐LSVisthemostextremecontent,withLSVshortfor“Language,Sex,Violence”. 
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Syntax
setmpeg2program{video1}eit‐tv‐rating{TV‐Y|TV‐G
|TV‐PG|TV‐14|TV‐MA|TV‐MA‐LSV}
factorydefault:TV‐G
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Example:
ZvCli$setmpeg2programvideo1eit‐tv‐ratingTV‐MA
Success
MPEG2EncodingControl
Thisgroupofcommandscanbeusedtofine‐tunethecharacteristicsoftheMPEG2encoder.Thefactory
defaultshavebeensettovaluesthatproducethebestpicture,whilealsomaximizingthechancethatallHDTVs
willcorrectlydisplaytheencodedvideo.WehavefoundthatsomeHDTVsaresensitive
tocertainthingslike
totalbit‐rateornumberofbitsofDCcoefficients.Thepicturemaysometimesbreakup,orinsomecasesnot
displayatall!
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Experimentingwiththesesettingscanimprovethequalityoftheencodedvideo,butwestronglyadviseyouto
testanychangeson
*eachtypeofHDTV*thatmayreceivethesignal.
SetEncodingBitRate
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Syntax
setmpeg2output‐data‐rate{low|normal
|high}   factorydefault:normal
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Adigitalcable(QAM)RFchannelallowsforadatarateupto38.78Mbps.Usually,thatstreamisdividedinto
multipledigitalchannels,eachhavingalowereffectivedatarate.SinceZvBoxisplacingasingledigitalchannel
inthestream,itcan
sendmoredataduringcomplexscenes,uptothe38.78Mbpslimit.Thiscanresultin
significantimprovementsinvideoqualityforcertainverycomplexscenes.However,someHDTVswill
experiencesomepicturebreakupifthedatarateeverexceeds19.4Mbpsforasingledigitalchannel.Wehave
observed
thatthisistrueofsomeSharpHDTVs,andmaybetrueofothers.
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TheNormalwillkeeptheencoder’soutputdatarateto19.4Mbps.Highwillallowtheencodertooperateupto
38.78Mbps.
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Example:
ZvCli$setmpeg2output‐data‐ratehigh
Success
VisualWatermark
ZvBoxesoverlay
aZvlogointhelowercornerofthebroadcaststream.Thelogohasa‘heartbeat’,slowly
appearinganddisappearing.ThisisusedtoidentifyaZvBoxasbeingthesourceofvideo.Thisvisualmarkcan
bedisabled.However,everyencodedvideostreamalsohasanembeddeddigitalwatermarkcontaining
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informationabouttheZvBoxandsystemthatcreateditthatcann otberemoved.Thisisaddedtohelptracethe
sourceofpotentiallypiratedvideo,anddoesnotaffectvisualqualityinanyway.
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