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My scope image
Figure6.17: Example imageaftercropping
The nextstepisto scale the image. Since thiscontentshould be presentedina 2.39:1 aspectratio inside a 1.85:1
DCPwewouldselectScopefromthe Scale tooptioninthe Video tabandFlat fromtheContaineroptionintheDCP
tab.
TheScaletooptionshouldalwaysbesettotheaspectratioatwhichthecontentshouldbeseen. TheContaineroption
shouldbesettothepresetthatyouwanttouseontheprojector. Ofcourse,thesetwosettingswilloftenbethesame.
Giventhe scaling andcontainerinformation, DCP-o-matic will look atthe DCP’scontainersize, andthen scale the
sourceimageupuntiloneorbothofitsdimensions(width,heightorboth)fitsthesizeofthe container,allthewhile
preservingthedesiredaspectratio.
In ourexamplehere, the DCP’scontainerisspecifiedas1.85:1 (so thatthe DCP will play back correctly using the
projector’s ‘Flat’ preset). At 2K, 1.85:1 is 1998 pixels by 1080. Scaling the source up whilst preserving its 1.85:1
aspectratiowillresultintheimagehittingthesidesofthecontainerfirst,atasizeof1998x836. Thisgivesusanew
versionofthe imageasshowninFigure6.18.
My scope image
Figure 6.18: Exampleimageaftercroppingandscaling
ThefinalstepistoplacetheimageintotheDCP.Inthiscase,sincewehavea2.39:1imagethatshouldbepresentedas
a1.85:1DCP,wehavesetthecontainerintheDCPtabtobeScope. Sincethecontenthasbeenscaledto1998x836,
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andaFlatcontaineris1998x1080,therewillbe someblack barsatthetopandbottomoftheimage. DCP-o-matic
sharesoutthisblack equally,asshowninFigure6.18.
My scope image
Figure 6.19: Exampleimageinthe DCP
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DCP-o-matic users’manual
26 /47
Chapter 7
DCP settings
Thischapterdescribesthe settingsthatapply tothewholeDCP.The controlsforthese settingsare inthe DCPtab
ofthe mainwindow,asshowninFigure7.1.
Figure 7.1: DCPsettingstab
Thefirstthinghereisthename. Thisisgenerallysettothetitleofthefilmthatisbeingencoded. If UseISDCFname
isnotticked,thenamethatyouspecifywillbeusedas-isforthe nameoftheDCP.If UseISDCFname isticked,the
namethatyouenterwillbe usedaspartofaISDCF-compliantname.
Underneath the name fieldisa preview ofthe name that the DCPwill get. Touse a ISDCF-compliantname, tick
the Use ISDCF name check-box. The ISDCF name willbe composed using detailsofyourcontent’s soundtrack, the
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currentdate andotherthingsthatcanbespecifiedintheISDCF namedetailsdialogue box,whichyoucanopenby
clickingonthe Detailsbutton.
Ifyouwantto take theISDCF-compliantnamethatDCP-o-matic generatesand modify it,click Copyasname and
the ISDCF name will be copied intothe Name box. You can then edititasyou wish. The DCPname shouldnot
matter(inthatitshouldnotaffecthow the DCPingestsorplays)butprojectionistswillappreciateitifyouuse the
standardnamingscheme asitmakesiteasierto identify detailsofthecontent.
TheContentType optioncanbe ‘feature’, ‘trailer’orwhatever;selecttherequiredtypefromthe drop-downlist. On
some projectionsystemsthis will affectwhere your content appears in the projector’sserveruserinterface, so take
care toselectanappropriatetype.
TheSignedcheck-boxsetswhetherornottheDCPissigned. Thisisrarely important;ifindoubt,tick it.
TheEncryptedcheck-box willsetwhethertheDCPshouldbeencryptedornot. Ifthisisticked,theDCPwillrequire
aKDMtoplay back. EncryptionisdiscussedinChapter8.
IfyouuseencryptionDCP-o-maticwillgeneratearandomencryptionkey foryou. Tospecifyyourownkey,clickthe
Edit.. buttonnexttothekey.
TheReelsandReellength controlsspecifyhowtheDCPwillbesplitupinto‘reels’. SeeSection7.1below.
TheStandardoptionspecifieswhichofthetwoDCPstandardsDCP-o-maticshoulduse. Ifindoubt,useSMPTE(the
more modernofthetwo).
Ticking the UploadDCP toTMSafteritismade will ask DCP-o-matic to copy the finished DCPtoyourconfigured
TMS(see Section9.1.5).
AtthebottomoftheDCPtabareafurthertwotabs,oneeachtocontainthesettingsfortheDCP’svideoandaudio
parts.
TheContaineroptionsetstheratiooftheimageintheDCP.Ifthisratioisdifferenttotheratiousedforanycontent,
DCP-o-matic willpadthecontentwithblack. Insimplecasesthisshouldbesettothesameratioasthatforthethe
primary piece ofvideo content. Alternatively, you mightwanttopillarbox asmall formatinto a Flatcontainer: in
thiscase,selectthesmallformatforthecontent’sratioand‘Flat’fortheDCP.
TheFrameRatecontrolsetstheframerate ofyourDCP.Thiscanbea littletrickytogetright. Ideally, youwantit
tobe thesameasthevideocontentthatyouareusing. Ifitisnotthesame,DCP-o-maticmustresorttosometricks
toalteryourcontenttofitthespecifiedframerate. FrameratesarediscussedinmoredetailinChapter10.
TheUse best button setstheDCPvideo frame ratetowhatDCP-o-matic thinksisthe bestgiventhe contentthat
youhaveadded.
The3DbuttonwillsetyourDCPto3Dmode ifitischecked. A3DDCPwill thenbecreated, andany 2Dcontent
willbemade 3Dcompatibleby repeatingthesameframeforbothleftandrighteyes. A3DDCPcanbeplayedback
onmany3Dsystems(e.g. Dolby3D,Real-Detc.) butnotona2Dsystem.
TheResolutiontaballowsyoutochoosetheresolutionforyourDCP.Use 2Kunlessyouhave contentthatisofhigh
enoughresolutiontobeworthpresentingin4K.
TheJPEG2000bandwidth;settingchangeshowbigthefinalimagefilesusedwithintheDCPwillbe. Largernumbers
willgive betterquality, butcorrespondingly largerDCPs. The bandwidthcanbe between 50 and250 megabitsper
second(Mbit/s). MostcommercialDCPsuse bitratesbetween75and125MBit/s.
TheAudio Channelscontrol setsthe numberofaudio channelsthattheDCPwill have. IftheDCPhasanychannels
for whichthere isno content audio they will be replacedby silence. Youcanonly set an even numberofchannels
here,sincethatisrequiredbytheDCIstandard. Ifyouwantanoddnumberofchannels,settheDCPchannelcount
toonegreaterthanyouneedandtheunusedchannelwillbefilledwithsilence.
TheProcessorcontrolallowsyoutoselectaprocesstoapplytotheaudiobeforeitgoesintotheDCP.Threeprocesses
are currently provided:
• Mid-sidedecode—thiswilltakeaL/Rstereoinputandextractthecommonpart(correspondingtothe‘Mid’ina
mid-side signal)intothe DCP’scentre channel. The remainingL/Rpartswillbe keptinthe L/Rchannelsofthe
DCP.Thismaybeusefultomakenear-fieldL/Rmixesmorecompatiblewithcinemaaudiosystems.
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• Stereoto5.1up-mixerA—thiswilltakeastereoinputandup-mix itto‘fake’5.1. TheinputL/Raretreatedas
follows:
– DCPLisinputLbandpass-filteredbetween1.9kHzand4.8kHz.
– DCPRisinputRbandpass-filteredbetween1.9kHzand4.8kHz.
– DCP C is input L mixed with input R, taken down by 3dB and then bandpass-filtered between 150Hz and
1.9kHz.
– DCPLfeisinputLmixedwithinputR,takendownby3dBandthenbandpass-filteredbetween20Hzand150Hz.
– DCPLsisinputLbandpass-filteredbetween4.8kHz and20kHz.
– DCPRsisinputRbandpass-filteredbetween4.8kHz and20kHz.
ThisupmixingalgorithmisduetoGéraldMaruccia.
• Stereoto5.1up-mixerB—thisusesadifferentapproach:
– DCPLisinputL.
– DCPRisinputR.
– DCPCisinputL+inputRtakendownby3dB.
– DCPLfe isDCPCbandpassfilteredbetween20Hz and150Hz.
– DCPLsandRsareinputL-inputRwitha20msdelay.
7.1 Reels
A‘reel’inaDCPisasubsectionoftheDCP,inthesame way asa35mmreelisasectionofa film. A DCPcanbe
splitupintoanynumberofreelsandthe joins(theequivalentto35mmsplices)betweenthereelsareseamless.
Thereisnoreasonwhyyoucan’tjustuseasinglereelforthewholeofyourDCP,asthereisnolimitontheirlength.
Many peoplechoose todothis.
Thereare,however,some possible advantagesofsplittingthingsupintoreels:
• Thepicture,soundandsubtitledataoftheDCPwillbesplitupintomoresmallerfilesondisk,ratherthanfewer
largerfiles. Thiscan be useful ifthe DCPisto be transferred on storage thathave file size limits. The FAT32
filesystem,forexample,canonlyholdfilessmallerthan4Gb. A6GbDCPwithasinglereelcouldnotbetransferred
usingaFAT32-formatteddisk. IfthatDCPweresplitupintotwo3Gbreelsitcouldbe transferred.
• It is easiertore-use DCPcomponentsifthey are in reels. Consider, forexample, afilm company who wants to
puta5secondidentontothebeginningofDCPsthattheydistribute. Ifthey receiveafeaturefilmDCPtheycan
modifyittoaddtheiridentasaseparate reel. ThisiseasierthanattachingthepicturedataintheDCP.
DCP-o-matic offersthree optionsforsettingupthereelsinyourDCP:singlereel,splitby videocontentorcustom.
Single reel, asits name suggests, keepsthe whole DCP as one reel. This is a perfectly goodoption if you have no
particularreasontoneedreels.
Splitbyvideo content putseachpieceofsourcevideocontentinitsownreel,asshowninFigure7.2.
ident.mp4
cred.mov
feature.ts
Reel 1
Reel 2
Reel 3
Figure7.2: Makingreelsusingsplitbyvideocontent
Here we have three video files (ident.mp4, feature.ts and cred.mov). With split byvideo content DCP-o-matic
makesa newreeltoholdeachvideo file.
Customsplitsreelsbythesizeofthefilesthatwillmakeuptheirvideocontent. WithCustomyoumustspecifyareel
lengthinGb. Thennofileinthe DCPwillbelargerthanthisreellength.
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7.2 Show audio
TheShowAudio buttonwillinstructDCP-o-matictoexaminetheaudio inyourcontentandplotagraphofitslevel
over time. Thiscan be useful forgetting a roughidea ofhow loudthe soundwill be in the cinemaauditorium. A
typicalplotisshowninFigure7.3
Figure7.3: Audioplot
Theplotgivesthe audiolevel (verticalaxis,indB)withtime (horizontalaxis). 0dB representsfull scale, soifthere
isanythingnearthisyouareindangerofclippingtheprojector’saudiooutputs.
Thereare twoplottypes: thepeaklevel andtheRMS,which canbe shownorhiddenusingthecheck-boxesonthe
righthandsideofthewindow.
Thechannelcheck-boxeswill showorhidetheplot(s)forthecorrespondingchannelsintheDCP.
The smoothing sliderappliesa variable degree oftemporal smoothing to the plots, whichcan make them easierto
readinsomecases.
Obviouslythe audioplotisnosubstituteforlisteninginanauditorium,butitcanbeusefultogetlevelsintheright
rougharea.
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DCP-o-matic users’manual
30 /47
Chapter 8
Encryption
It is not required that DCPs be encrypted, but they can be. This chapter discusses the basic principles ofDCP
encryption,andhowDCP-o-maticcancreateencryptedDCPsandKDMsforthem.
8.1 Basics
DCPscanbe encrypted. This meansthatthe picture andsound dataare encoded in suchaway thatonly cinemas
‘approved’by theDCP’screatorscanreadthem. Inparticular, thismeanscopiesofthe DCPcanbe distributedby
insecuremeans: ifanne’er-do-wellcalledMallory obtainsaharddrivecontaininganencryptedDCP,thereisnoway
thathecanplayit. Onlythosecinemaswhoreceiveacorrectkeydeliverymessage(KDM)canplaytheDCP.
8.1.1 How it works (in a nutshell)
This section attemptsto summarise how DCP encryption works. You can skip itifyou like. You may needsome
knowledge ofencryptionmethodstounderstandit.
WesupposethatwearetryingtosendaDCPtoAlice’scinemawithoutatroublemakercalledMallorybeingableto
watchithimself.
Therearetwomainfamiliesofencryptiontechniques. Thefirst,symmetric-keyencryption,allowsustoencodesome
datausing some numerickey. Afterencoding,no-onecandecodethedataunlessthey knowthekey.
ThefirststepinaDCPencryptionistoencodeitsdatawithsomekeyusingsymmetric-keyencryption. Theencrypted
DCPcanthenbe sentanywhere,safe intheknowledgethatevenifMallorygotholdofacopy,hecouldnotdecrypt
it.
Alice,however,needstoknowthekeysoshecanplaytheDCPinhercinema. A simpleapproachmightbeforusto
sendAlicethe key. However,ifMallory canintercepttheDCP,hemightalsobe abletointerceptourcommunication
ofthe key toAlice. Furthermore,ifAlice happenedtoknowMallory,she couldjustsendhimacopyofthekey.
Thecleverbitintheprocessrequirestheuseofpublic-keyencryption. Withthistechniquewecanencryptablockof
datausingsome‘public’key. Thatdatacanthenonlybedecryptedusingacorrespondingprivatekeywhichisdifferent
tothepublickey. Theprivateandpublickeysformapairwhicharerelatedmathematically,butitisextremely hard
(orrather, virtuallyimpossible)toderive theprivatekeyfromthepublickey.
Public-keyencryptionallowsustodistributetheDCP’skeytoAlicesecurely. The manufacturerofAlice’sprojector
generates a public and private key. They hide the private key deep inside the bowels of the projector (inside an
integratedcircuit)whereno-onecanreadit. They thenmake the publickeyavailabletoanyone whoisinterested.
We take our DCP’s symmetric key and encryptitusing the public key ofAlice’s projector. We send the resultto
Aliceoveremail (usingaformatcalledaKey Delivery Message, orKDM). Herprojectorthendecryptsourmessage
usingitsprivatekey,yieldingthe magicsymmetric keywhichcandecrypttheDCP.
IfisfineifMallory interceptsouremailtoAlice,since theonly keywhichcandecryptthemessageistheprivate key
buriedinsideAlice’sprojector. Theprojectormanufacturerisverycarefulthatno-oneeverfindsoutwhatthiskeyis.
OurDCPissecure: only Alicecanplayitback,since only herprojectorknowsthekey(evenAlicedoesnot).
8.2 Encryption using DCP-o-matic
TherearetwostepstodistributinganencryptedDCP.First,theDCP’sdatamustbeencrypted,andsecondlyKDMs
mustbe generatedforthosecinemasthatareallowedtoplaytheDCP.
Thefirstpartissimple: tickingtheEncryptedboxintheDCPtabwillinstructDCP-o-matictoencrypttheDCPthat
itmakesusingarandomkey thatDCP-o-matic generates. The key willbewrittentothefilm’smetadata file,which
shouldbe keptsecure.
ADCPthatis generatedwith the Encrypted box ticked will not play on any projectoras-is (it will be marked as
‘locked’,orwhatevertheprojectormanufacturer’stermis).
ThesecondpartofdistributionsistogenerateKDMsforthecinemasthatyouwishtoallowtoplayyourDCP.There
are two approaches to this within DCP-o-matic: using the project, or using a DKDM. These approaches are now
describedinturn.
8.2.1 Creating KDMs from a DCP-o-matic project
Youcancreate KDMsfrominside aDCP-o-matic projectusingthe Make KDMsoptionontheJobsmenu. Thiswill
openthe KDMdialoguebox,asshowninFigure8.1.
Figure8.1: KDMdialog
InordertogenerateKDMsforaparticularprojector,youneedtoknowitscertificate. Theseareusuallymadeavailable
bytheprojectormanufacturersastextfileswitha.pemextension.
DCP-o-matic canstore these certificatesalongwithdetailsoftheircinemasandscreenswithinthosecinemas. Each
screen has a certificate for its projector (and optionally certificates for other trusted devices, such as the sound
processor). DCP-o-maticcangenerate KDMsforanyscreensthatitknowsabout.
To adda cinema, click Add Cinema.... This opensa dialogue box into whichyoucanenterthe cinema’sname, and
optionally anemailaddress. Thisemailaddresscanbe usedtogetDCP-o-matictodeliverKDMsviaemail.
Onceyouhaveaddedacinema,selectitbyclickingonitsname,thenclickAddScreen.... Theresultingdialogueallows
youto enteraname forthe screen andloadinitscertificatefroma file. Thecertificate should be inSHA256PEM
format.
Alternatively, certificates for projection systems made by some manufacturers can be downloaded from databases
provided by the manufacturer. Currently this is supportedfor Doremi and Dolby equipment. If you are targeting
ascreen with equipmentby one ofthese manufacturersyoucanclick Download thenenter the serial numberofthe
serverinthescreenandclick Downloadagainand,allbeingwell,thecertificate willbe fetched.
Usingthe download systemyou willneed to know the serialnumberofthe media serverin use inthescreen. Most
cinemaprojectionortechnicaldepartmentswillknowtheseserialnumbers.
Note thatthe reliability ofthemanufacturers’certificatedatabasescannotbeguaranteed. ItisvitalthatKDMsare
testedbythedestinationcinemawillinadvance ofshowtimetoidentifyanyproblems.
Once youhavesetupallthe screensthatyouneedKDMsfor,selecttheCPLthatyouwantto create the KDMfor.
Youcanuse the drop-downlist toselectthe CPLsin the currentfilmproject,orload aCPLfromsomewhere else.
Selectthe cinemasand/orscreensthatyouwantKDMsforandfillinthe startandenddatesandtimes.
YoumustalsoselectthetypeofKDMthatyouwanttogenerate. Ifindoubt,useModifiedTransitional1.
Finally,choosewhatyouwanttodowiththeKDMs. Theycanbewrittentodisk,toalocationthatyoucanspecifyby
clickingBrowse. Alternatively,ifyouchooseSendbyemailtheKDMswillbezippedupandemailedtotheappropriate
cinemaemailaddresses. Click OKtogeneratethe KDMs.
8.2.2 Creating KDMs using a DKDM
It can be inconvenient to need a whole DCP-o-matic projectjust to create KDMs for its film. Perhaps you want
to archive the projectto save space, or create KDMson a differentmachine. In such situations it iseasierto use
aDKDM. Thisis a normal KDM, butinstead of being targeted at a projectionsystem(to allowit to decrypt the
content)itistargetedataparticularusers’scertificate. Thismeansthatthe certificateownercancreatenewKDMs
forotherusers. TheDKDMholdseverything thatisrequiredtocreatefurtherKDMs.
SometimesitisusefultocreateDKDMsthatcanbeusedbyDCP-o-matic. IfyoucreatesuchaDKDMyoucankeep
itandthen, atany pointinthe future,use DCP-o-matic’sstandaloneKDMcreatortomakeKDMsforthe DKDM’s
filmforany cinema.
InothercasesaDKDMissenttoa3rdpartysothattheycancreateKDMsforyourfilms. Thiscanbe usefulif,for
example, youhavea distributorwhoprovides24-hourKDMsupportto cinemas andcan create KDMsfor anybody
thatrequiresthematshortnotice.
TocreateaDKDMforDCP-o-matic,openyourencryptedprojectandselectMakeDKDMforDCP-o-matic... fromthe
Jobsmenu. SelecttheCPLthatyouwanttomaketheDKDMforandclick OK. ThisDKDMwill thenbe available
intheKDMcreator. Thisisaseparateprogramwhichyoucanstartfromthesameplacethatyoustartthe‘Normal’
DCP-o-matic. ItswindowisshowninFigure8.2.
Figure8.2: The KDMcreator
TocreateKDMs,selectthecinema(s)and/orscreensthatyouwantKDMstobecreatedfor,thedaterange,theDCP
thattheKDMsare forandthe destinationfortheKDMsandclick Create KDMs.
BydefaulttheDKDMlistwilllistanyDCPsforwhichyouhaveclickedMakeDKDMforDCP-o-maticinthemainDCP-
o-matic program. Ifyouhave otherDKDMsyoucan addthemby clicking Add... andspecifyingthe file containing
theDKDM.
IfanotherorganisationwantstosendyouaDKDMtheywillaskyouforatargetcertificate. YoucangetDCP-o-matic’s
targetcertificatebyopeningPreferencesandclickingExportDCPdecryptioncertificate... intheKeystab.
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