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8.3 Encryptionoverview
1. Create
encrypted
DCP
Picture
Sound
Subtitle
Encrypted DCP that no-one
else can read.
2. Create 
(D)KDM
Encrypted key and details
of the DCP.  Key can only
be decrypted by the private key
held by the DKDM's recipient.
DKDM recipient/
projector
certificate
3. Decrypt
(D)KDM
4. Make new
KDM
DKDM
recipient
private key
Picture
Sound
Subtitle
Encrypt
Unencrypted data
Random key
KDM
recipient
(projector)
certificate
KDM
for cinema
Projector
private key
Play
3. Play
DCP
Encrypt
Encrypt
Decrypt
Decrypt
Decrypt
Data which must
be kept secret
Data which can 
be sent over
public channels
Figure8.3:Overviewofencryption
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DCP-o-maticusers’manual
35/47
Chapter 9
Preferences
DCP-o-matic provides a fewpreferences whichcanbe usedtomodify its behaviour. This s chapter explains those
options.
9.1 Thepreferencesdialogue
Thepreferences dialogueisopenedby choosingPreferences... from m theEdit menu. Thedialogueis s split intoseven
tabs.
9.1.1 General
ThegeneraltabisshowninFigure9.1.
Figure9.1:Generalpreferences
9.1.1.1 Language
IfyouticktheSetLanguagecheckboxandchoosealanguagefromthelist,thatlanguagewillbeusedforDCP-o-matic.
YouwillneedtorestartDCP-o-matictoseethenewlanguage.
ThetranslationsforDCP-o-matichavebeencontributedbyhelpfulusers.Ifyourlanguageisnotonthelast,headto
theDCP-o-maticwebsitetoreadabouthowtocontributeatranslation.
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9.1.1.2 Threads
WhenDCP-o-maticisencodingDCPsitcanusemultipleparallelthreadstospeedthings up. Setthisvaluetothe
numberofthreadsDCP-o-maticshoulduse. Thisshouldnormallybethenumberofprocessors(orprocessorcores)
inyourmachine.DCP-o-maticwilltrytosetthisupcorrectlywhenyourunitforthefirsttime.
9.1.1.3 Cinemaandscreendatabasefile
ThisoptionallowsyoutochangethefilethatDCP-o-maticusestostoredetailsofthecinemasandscreensusedto
makeKDMs.
9.1.1.4 Integratedloudness
IfFindintegratedloudness,truepeakandloudnessrangewhenanalysingaudioisticked,DCP-o-maticwilldoextrawork
whenanalysingaudio. Leavethistickediftheextraparametersareusefultoyou. Ifnot,untickitandaudioanalysis
willbefaster.
9.1.1.5 Updates
TheCheckforupdatesonstartupoption,ifenabled,willtellDCP-o-matictocheckondcpomatic.com toseeifthere
any newer versions of DCP-o-matic thenthe one youare running. If f so, adialogue box willopenwith h alink k to
downloadthenewversion.available
TheCheckfortestingupdatesaswellasstableonesoptionwillalsocheckfortestupdates as wellas thosethat are
formally‘released’. Thisisusefulifyouliketoliveonthebleedingedge!
9.1.1.6 Issuerandcreator
WiththesecontrolsyoucansettheissuerandcreatorstringsthatwillbeputintotheDCPswhichyoucreate.
9.1.2 Defaults
ThedefaultstabisshowninFigure9.2.
Figure9.2: Defaultspreferences
Theoptionsinthistabsimplyallowyoutosetupdefaultvaluesforvariouspropertiesofnewfilms.
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9.1.3 Servers
TheserverstabisshowninFigure9.3.
Figure9.3: Serverspreferences
If UseallserversistickedDCP-o-maticwilllocateencodingserversautomatically(seeChapter11).
Insteadofthis(orinaddition)servers canbespecifiedexplicitly. Toaddaserver,click k Add... andenter r thehost
nameorIPaddressoftheservertouse.
9.1.4 Keys
TheKeys tab(showninFigure9.4) holds options relatedtothekeys andcertificatesusedinsomeparts of DCP
creation.
Figure9.4:Keyspreferences
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AtthetopofthetabisthechainofcertificatesthatwillbeusedtosignDCPsandKDMs. DCP-o-maticcreatesa
randomchainwhenyoufirstrunitandifyouarehappytousethischainyoucanignorethepreferences.Otherwise,
youcanaddorremovecertificatesfromthechainusingtheAdd...andRemovebuttons.
IfyouwantDCP-o-matictore-createthecertificatechain(usingnew,randomcertificates)clickRe-makecertificates...
andspecifyyourorganisationandcommonnamesinthedialogueboxthatopens.
Underneaththecertificatechainistheprivatekeythatcorrespondstotheleafcertificateinthechain.Youcanspecify
yourownprivatekeybyclickingLoad.... Youmustdothisifyouchangetheleafcertificate,sothattheleafprivate
keycorrespondstothepublickeyheldintheleafcertificate.
UnderneaththedetailsofthecertificatechainandprivatekeyforsigningofDCPsandKDMsisasecondchainand
keywhichisusedbyDCP-o-maticwhenyouimportanencryptedDCPasapieceofcontent. Theleafcertificateof
thischaincontainsthepublickeythatshouldbeusedwhentargetingaKDMatDCP-o-matic.
IfyouwanttoimportanencryptedDCPyouwillneedtogivethedecryptioncertificatetothedistributoroftheDCP
sothattheycangenerateaDKDMfor you. . YoucansavethiscertificatetodiskbyclickingExportDCPdecryption
certificate.... Aswiththesigningchain,DCP-o-maticwillcreateacertificatechainandprivatekeyforyou. Youcan
alsochoosetoloadyourowncertificatesandkeyorre-makethechainandkeywithnew,randomvalues.
9.1.5 TMS
TheTMStab(showninFigure9.5)givessomeoptionsforspecifyingdetailsaboutyourtheatremanagementsystem
(TMS).Ifyoudothis,andyourTMSacceptsSSHorFTPconnections,youcanuploadDCPsdirectlyfromDCP-o-
matictotheTMSusingtheSendDCPtoTMSoptionintheJobsmenu.
Figure9.5:TMSpreferences
ProtocolshouldbesettoSCPorFTPasappropriateforyourTMS.WeknowthattheArtsAllianceMedia(AAM)
andtheDoremirangesusesSCPconnections,andthatDolby’sTMSsuseFTP.Doletusknowifyouuseanyother
typeofTMSwiththeSendDCPtoTMSfeature.
TMSIPaddress shouldbeset totheIPaddress of yourTMS, TMStargetpath tothe place that DCPs shouldbe
uploadedto (whichwill be relative to the home directory of the SSH or r FTP user). Finally, , theuser r name and
passwordarethecredentialsrequiredtologintotheTMSviaSSHorFTP.
NotethatforthistoworkonDoremiserversyouwillneedtosetthePasswordAuthenticationoptioninyourserver’s
sshd_configtoyes.
9.1.6 KDMemail
TheKDMemailisshowninFigure9.6.
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Figure9.6: KDMemailpreferences
ThisisatemplatefortheemailthatisusedtosendKDMsouttocinemas. Youcanchangeittosaywhateveryou
like. Afew‘magic’stringswillbereplacedbyinformationfromtheKDMthatisbeingsent:
$CPL_NAME
DCPtitle
$CINEMA_NAME
Cinemaname
$SCREENS
NameofscreenorscreensthatKDMsarebeing
generatedfor
$START_TIME
ThetimefromwhichtheKDMsarevalid
$END_TIME
ThetimeuntilwhichtheKDMsarevalid
Table9.1: ‘Magic’KDMstrings
TheResettodefaulttextwillreplacethecurrentKDMemailwithDCP-o-matic’sdefault.
9.1.7 Advanced
TheadvancedpreferencesareshowninFigure9.7.
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Figure9.7:Advancedpreferences
Maximum JPEG2000 bandwidth specifies s the maximum bit-rate of JPEG2000 0 that t DCP-o-matic will allow w you to
create. Youareadvisedtoleavethisat250Mbit/sinnormaluseformaximumDCPcompatibility.
AllowanyDCPframerateremovesthelimitsontheDCPvideoframeratesthatDCP-o-maticwillcreate. Thismay
beusefulforexperimentation. Again,youarestronglyadvisedtoleavethisuntickedfornormaluse.
Only serversencode makesDCP-o-maticencodeJPEG2000dataonlyonencodingserversandnotonthehost. We
suggestyouleavethisun-tickedunlessyouhaveagoodreasontodootherwise.
ThefourcheckboxeslabelledLogcontrolwhatsort of messages DCP-o-maticwritestoits logfilewhencreatinga
DCP.ItisusefultoleaveGeneral,WarningsandErrorstickedasthismakesthelogfilesusefulfortrackingdownbugs.
TheTimingcheckboxwillenableextralogentriestoallowdeveloperstoinvestigateandoptimizethespeedofDCP-
o-matic. Itwillsignificantly y increasethesizeofthelogfilesthataregenerated,soinnormaluseitisbesttoleave
thisunticked.
DCP-o-maticusers’manual
41/47
Chapter 10
Frame rates
Inanidealworld,aDCPwouldbecreatedusingcontentatthesamevideoframeandaudiosamplingratesasthe
DCP.Thisisnot,however,alwayspossible.
10.1 DCPframeratelimitations
Thereare some limitations tovideoandaudio frame rates inDCPs. This s is complicatedbythefact thatnotall
projectorswillplayDCPsatthesameframerates. ItispossibletocreateaDCPwhichoneprojectorwillplayfine,
butanother(ofadifferenttype)willrefusetoplay,orevenrefusetoingest.
10.1.1 Guaranteedrates
Theonlyrates thatare(pretty much)guaranteedtoworkonallDCIprojectorsare24framesper second(fps)for
videoand48kHzor96kHzforaudio.IfyouaresendingyourDCPstounknownplacesitwisetoconsiderusingthese
ratesifatallpossible.
10.1.2 Otheroften-supportedrates
Manyprojectorsnowinthewildsupportadditionalvideoframerates:25,30and48fps.
10.1.3 AdaptingcontenttofittheDCPrate
DCP-o-matichasafewtrickstoallowyoutousecontentthatisnotinoneofthe‘approved’rates.
Audioiseasy:DCP-o-maticcanresampleto48kHzfromanysourceratewithminimallossinquality.
Videorateconversionisharder. DCP-o-matic’sbasicstrategytodealwithanon-supportedcontentrateistorunit
atthewrongspeed,andtoadjusttheaudiotokeepitinsync.
Letusconsider theexampleofa25fpssourceforwhichyouwanttocreatea24fpsDCP.DCP-o-maticwillputthe
frames fromthesourcedirectlyintotheDCPwithoutmodification,butwilltelltheprojectortoplaythembackat
24fps.ThismeansthattheDCP’svideowillrunslightlyslowerthantheoriginal.
IfDCP-o-maticdidnothingelse,theresultofthiswouldbethattheaudiowouldberunningattheoriginalspeedwith
thevideorunningslowly. Hencetheaudiowoulddriftslowlyoutofsync.Toavoidthis,DCP-o-maticalsoresamples
theaudiosuchthattheprojectorwillplayittooslowbythesameamount.Henceitwillsoundslightlydifferentbut
willremaininsyncwiththevideo.
Forveryloworhighframerates,DCP-o-maticcanalsoskiporduplicateframes.
10.2 Settingup
TheFrameRatecontrolintheDCPtabsetsthevideoframeratethattheDCPwilluse. ClickingUsebestsetsthe
ratetowhatDCP-o-maticthinksisthebestforyourcontent.Withthisbutton,DCP-o-maticassumesthatthewhole
rangeofframerates(24,25,30and48fps)areallowable.
Afterthis,theVideotabforeachpieceofcontentwillgiveasummaryofwhatDCP-o-maticisdoingwiththatcontent.
If youwanttoexperimentwithothernon-standardframerates,youcandosobytickingthe Allowany DCPframe
rateintheAdvancedtabofthepreferencesdialogue(seetheAdvancedpreferences). Youarestronglyadvisedtouse
thisonlyonyourownequipment,andonlyforexperimentationpurposes.
DCP-o-maticusers’manual
43/47
Chapter 11
Encoding servers
One way toincreasethespeedofDCPencodingis tousemorethanone machineatthesame time. Aninstance
ofDCP-o-maticcanoffloadsomeofthetime-consumingJPEG2000encodingtoanynumberofothermachinesona
network. Todothis,one‘master’machinerunsDCP-o-matic,andthe‘server’machinesrunasmallprogramcalled
dcpomatic_server.
Themasterandserver machines donotneedtobethesametype,soyoucanmixWindows PCs,MacsandLinux
machinesasyouwish.
11.1 Runningtheservers
Therearetwooptionsfortheencodingserver;dcpomatic_server_cli,whichrunsonthecommandline,anddcpo
matic_server,whichhas asimpleGUI.Thecommandlineversionis well-suitedtoheadlessservers, , especiallyon
Linux,andtheGUIversionworksbestonWindowswhereitwillputaniconinthesystemtray.
Torunthecommandlineversion,simplyenter:
dcpomatic2_server_cli
atacommandprompt.Ifyouarerunningtheprogramonamachinewithamulti-coreprocessor,youcanrunmultiple
parallelencodingthreadsbydoingsomethinglike:
dcpomatic2_server_cli -t 4
torun4threadsinparallel.
ToruntheGUIversiononwindows,runthe‘DCP-o-maticencodeserver’fromthestartmenu. Aniconwillappear
inthesystemtray;right-clickittoopenamenufromwhenceyoucanquittheserveroropenawindowtoshowits
status.
IfyouwouldrathernotbotherinstallingDCP-o-maticonyourservercomputers,theotheroptionistousethelive-CD
imagethatyoucandownloadfromtheDCP-o-maticwebsite.
EitherburntheimagetoCD,orwriteittoaUSBstick(usingsomethinglikeunetbootin). BootaPCfromtheCD
orUSBstickanditbecomesaDCP-o-maticserverwithouttouchingyourstandardoperatingsysteminstall.
11.2 SettingupDCP-o-matic
DCP-o-maticperiodicallylooksonthelocalnetworkforservers. Anythatitfindsaregivenworktododuringencodes.
SelectingEncodingServersfromtheToolsmenubringsupawindowwhichshowsthatserversthatDCP-o-matichas
found.
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