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Onceyouhaveinstalledthedevelopmentpackagesforthedependencies,downloadthesourcecodefromhttp://dcpomatic.com/-
,unpackitandrunthe followingcommandsfrominsidethesourcedirectory:
./waf configure
./waf build
sudo ./waf install
Withanyluck,thiswill buildandinstallDCP-o-maticonyoursystem. Torunit,enter:
dcpomatic2
inashell.
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DCP-o-matic users’manual
5/47
Chapter 3
Creating a DCP from a video
In thischapterwewill see how tocreate aDCPfroma videofile using DCP-o-matic. We will glossoverthe details
andlookatthebasics.
3.1 Creating a new film
Let’s make a very simple DCP to see how DCP-o-matic works. First, we need some content. Download the low-
resolutiontrailerfortheopenmovieSintelfromtheirwebsite. Generallyonewouldwanttousethehighest-resolution
materialavailable,butforthistestwewillusethelow-resolutionversionto saveeveryone’sbandwidthbills.
Now, startDCP-o-matic anditswindowwill open. First, we will create a new ‘film’. A ‘film’ ishow DCP-o-matic
refersto some piecesofcontent, along withsome settings, whichwe willmake intoa DCP. DCP-o-matic storesits
datainafolderonyourdiskwhileitcreatestheDCP.YoucancreateanewfilmbyselectingNewfromtheFilemenu,
asshowninFigure3.1.
Figure 3.1: Creatinganewfilm
Thiswillopenadialoguebox forthenewfilm, asshowninFigure3.2.
Figure3.2: Dialogueboxforcreatinga newfilm
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In this dialogue box you can choose a name forthe film. Thiswill be used toname the folderto store its data in,
andalsoastheinitialnamefortheDCPitself. Youcanalsochoosewhereaboutsyouwanttocreate thefilm. Inthe
example fromthefigure,DCP-o-maticwill create afoldercalled‘DCPTest’insidemyhome folder(carl)into which
itwillwriteitsworking files.
3.2 Adding content
Thenextstepistoaddthecontentthatyouwanttouse. DCP-o-maticcanmakeDCPsfrommultiplepiecesofcontent,
butinthissimple example wewilljustuse asingle piece. Clickthe Addfile(s)... button,asshowninFigure3.3,and
afilechooserwillopenforyoutoselectthecontentfile touse, asshowninFigure3.4.
Figure3.3: Addingcontentfiles
Figure3.4: Selectingavideocontentfile
Selectyourcontentfile andclick Open. Inthiscasewe are usingtheSintel trailerthatwe downloadedearlier.
Whenyoudothis,DCP-o-maticwilltakealookatyourfile. Afterashortwhile(whentheprogressbaratthebottom
rightofthe windowhasfinished), youcanlook throughyourcontentusing the slidertothe rightofthe window,as
showninFigure3.5.
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Figure3.5: Examining thecontent
Draggingthesliderwillmovethroughyourvideo. Youcanalsoclickthe Playbuttontoplay the contentback. Note
thatthere will beno sound,and playback mightnotbe entirely accurate (itmay be slightly slowerorfasterthan it
shouldbe,forexample). Thisplayerisreallyonlyintendedforbriefinspectionofcontent;ifyouneedtocheckitmore
thoroughly,use anotherplayersuchasTotem,mplayerorVLC.
3.3 Making the DCP
Inmostcases,someadjustmentswouldbemadetoDCP-o-matic’ssettingsoncethecontenthasbeenadded. Forour
simpletest,however,thedefaultvalueswillsuffice,sowe cangostraightonto makingtheDCP.
Choose Make DCPfromtheJobsmenu. DCP-o-matic will encode yourDCP.Thismay takesome time(many hours
insome cases). Whilethejobisinprogress,DCP-o-matic willupdate youonhowitisgetting onwiththe progress
barinthe bottomofitswindow,asshowninFigure3.6.
Figure 3.6: MakingtheDCP
Whenithasfinished,theDCPwillenduponyourdiskinsidethefilm’sfolder. Youcanthencopy thistoaprojector
viaaUSBstick,hard-driveornetworkconnection. SeeChapter12fordetailsaboutthefilesthatDCP-o-maticcreates.
Alternatively,ifyouhaveaprojectororTheatreManagementSystem(TMS)thatisaccessibleviaSCPorFTPacross
yournetwork,youcanuploadthecontentdirectlyfromDCP-o-matic. See theTMSpreferencesinSection9.1.5.
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DCP-o-matic users’manual
8/47
Chapter 4
Creating a DCP from a still image
DCP-o-maticcanalsobeusedtocreateDCPsofoneormorestillimages,perhapsforanadvertisementoranon-screen
announcement. Thischaptershowsyouhowtodoit.
AswithDCPsmade fromvideo files,the firststepisto createa new‘Film’;selectNewfromthe File menuandthe
newfilmdialogue willopenasshowninFigure4.1.
Figure4.1: Dialogueboxforcreatinga newfilm
Enteraname andclick OK.Nowweneedtoaddthe content. Asbefore,click Addfile(s).... Forourexample,wewill
addasingleimage file,asshowninFigure4.2.
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Figure 4.2: Selectingastillcontentfile
Mostofthedefaultsettingswillbefineforasimpletest. Theonethingthatyoumightwishtochange isthelength
ofthe still. Selectthe TimingtabandyouwillseeaPlaylengthsetting,asshowninFigure4.3.
Figure4.3: Thetimingtab
Thislengthisa‘timecode’: itconsistsoffournumbers. Thefirstishours,thesecondminutes,thethirdseconds,and
thefourthframes. Enterthedurationthatyouwantandthenclick Set.
Finally,aswithvideo,youcanchoose MakeDCPfromtheJobsmenutocreate yourDCP.Thiswillbemuchquicker
thancreatingaDCPfromavideofile,asDCP-o-maticonlyneedstoencodeasingleframewhichitcanthenrepeat.
DCP-o-matic users’manual
10 /47
Chapter 5
Manipulating existing DCPs
Frequently DCP-o-matic is usedto take contentin formatssuchas MP4and convertit toJPEG2000 foraDCP.It
canalso be usedtotakeexistingDCPsandmodify theminvariousways.
5.1 Importing a DCP into DCP-o-matic
IfyouwanttodosomethingtoanexistingDCPthefirststepistoimportit. ClickAddfolder... andselectyourDCP’s
folder. ItwillbeaddedtotheDCP-o-maticproject. IftheDCPisunencryptedyoucanpreviewitinthenormalway,
thoughplayback willbeveryslowasdecodingofDCPsisalmostascomputationally intensive asencodingthem.
5.2 Decrypting encrypted DCPs
DCPscanbeencrypted(see Chapter8fordetails). IfyouimportanencryptedDCPyouwillneedakey,intheform
ofaKeyDeliveryMessage(KDM),todecryptit.
KDMs must be prepared by the organisation which created the DCP. They contain the keysto decryptthe DCP
wrappedupinsucha waythatonlytheintendedrecipientcanreadthem. Youwillneedtoprovidetheorganisation
withacertificatewhichidentifiesyourcopyofDCP-o-maticandallowsthemtocreateaKDMforyou.
To getDCP-o-matic’sdecryptioncertificate, open the Preferencesdialogue (seeChapter 9)and go to the Keystab.
Click the Export DCP decryption certificate... button at the bottom of this tab and save the certificate. Send this
certificate totheDCPcreatorsandtheycancreatea KDMtoallowDCP-o-matictodecrypttheirDCP.
Once youhave yourKDM, right-click theDCP’snameinDCP-o-maticand choose AddKDM.... Specify yourKDM
and(allbeingwell)the DCPwillbedecryptedandbecomeavailableforpreview.
5.3 Making a DCP from a DCP
Inmanyways,usingDCPsascontentinDCP-o-maticisthesameasusinganyothercontent. Thereareafewthings
tonote,though.
5.3.1 Re-use of existing data
WherepossibleDCP-o-maticwillre-useexistingJPEG2000-compresseddatafromDCPcontentwithoutmodification.
ThishastheadvantagethatcreationofthenewDCPwillbequick,asthetime-consumingJPEG2000encodingisnot
necessary.
DCP-o-matic candothisifyouavoid changestothefollowingcontentsettings:
• Crop
• Scaling
• Subtitle burn-in
• Fades
• Colourconversion
If youdochange any of these settings on a piece ofDCPcontentDCP-o-matic will decode and then re-encode the
JPEG2000data.
5.3.2 Making overlay files
Withitsdefaultsettings,DCP-o-maticwilltakeanydatafromDCPcontentandcopyitintotheDCPthatitcreates.
SeeFigure5.1.
Picture
Sound
Subtitle
Content DCP
Picture
Sound
Subtitle
New DCP
Make DCP
Figure5.1: CreatinganewDCPbycopyinganexistingone
Thiscanbeinefficientinsomecases. Consider,forexample,afilmwhichhastendifferenttranslationsforwhichthe
subtitles are differentbutvideo and audio are the same. Ifthe video and audio contenttakes up, say, 100Gb this
meansthatthe setofDCPsforeverytranslationwouldbeabout1Tbwithalotofduplicateddata.
The DCP format hasa solutionto thisproblem. One DCP can refertothe ‘assets’ (picture, soundor subtitle) of
anotherDCP.Forourtranslationexamplethismeansthatwecouldhavea‘base’DCP(oftencalledtheOVorOriginal
Version) containing video, audioand one setofsubtitlesandthenany numberofoverlay DCPs(oftencalledVFor
VersionFiles)whichrefertothe baseversionandreplacetheoriginalsubtitleswiththeirown. Figure5.2 showsthis
principle forone ofourtranslations. The DCPthat we make refersto the originalcontentDCP’svideo and audio
ratherthancontainingacopy.
Picture
Sound
Subtitle
Content DCP
Subtitle
New DCP
Refer to picture
Refer to sound
Make DCP
Figure5.2: Creatinga newDCPbyreferringtoanexistingone
Toplayback the subtitledDCPthe projectionistingestsboth the base (OV)DCPandtheoverlay (VF)DCP,then
playstheVFone.
Tomake aDCPlikethis:
• Importyour‘ContentDCP’toa DCP-o-matic project.
• AddwhateverreplacementyouwantinyournewDCP(replacementsubtitlesoraudiofiles,forexample).
• Selectthe DCPinthecontentlist
• Tick theRefertoexistingDCPcheckboxinthetabsforthepartsoftheDCPthatyouwanttorefertoinyournew
DCP. Forexample,torefertotheContentDCP’svideo andaudio you would selectthe Video tab, click Referto
existingDCPthenselecttheAudio tabanddothesame.
• DoMakeDCPasusualandyourVFDCPwillbe created.
DCP-o-matic users’manual
13 /47
Chapter 6
Content settings
ThepreviouschaptersshowedDCPgeneration using the defaultsettings. DCP-o-maticoffersarange offeaturesto
adjustthe contentthatgoesintoyourDCP,andthischapterdescribesthosefeaturesindetail.
6.1 Adding and removing content
AtthetopoftheContenttabisalistofthecontentthatwillgointoourDCP.Therecanbeasmanypiecesofcontent
asyoulike,andthey canbeofthefollowingtypes:
• Movie—afilecontainingsome video,probablysomeaudioandpossiblysomeembeddedsubtitles;forexample,a
MOV,MP4orVOB.
• Sound—afilecontainingoneormore channelsofaudio;forexample,aWAVorAIFFfile.
• Still image—afilecontaining asingle stillimage;forexample,aJPEG,PNGorTIFFfile.
• Movingimage—adirectory containingmanystillimageswhichshouldbetreatedastheframesofa video.
• Subtitle —afile containing subtitle whichwillbe superimposedonthe image ofthe DCP.These canbe .srt, .ssa
or.xmlfiles.
• DCP—anexistingDCP.
Toaddoneormore movie,sound,still-imageorsubtitlefiles,selectAddfile(s)... andchoosethemfromthe selector.
To adda directory (folder) ofimages or a DCP, choose Add folder... andchoose the directory fromthe selector. If
youselectafolderofimagesDCP-o-maticwillopenasmalldialogueboxwhereyoucanentertheframeratethatthe
imagesequenceshouldberunat.
Youcanremove apieceofcontentby clickingonitsnameandthenclickingthe Removebutton.
6.2 Adding existing DCPs
AddingexistingDCPstoaDCP-o-maticfilmisalittledifferenttoaddingothertypesofcontent. Mostcontenthasto
beconvertedtoJPEG2000,thecompressionschemeusedbyDCPs,whichisavery time-consumingprocess. Existing
DCPsare already inJPEG2000 formatso do notrequire conversion. Thismeansthat,providednosettingssuchas
cropareusedontheDCPcontent,pictureandsounddatawillbe passedfromexistingtonewDCPunaltered.
EncryptedDCPsthatare addedascontentwill require a KDMtargetedatDCP-o-matic sothatDCP-o-matic can
decrypt them. You should ask the creator ofthe imported DCP to provide a KDMfor DCP-o-matic’s decryption
certificate,whichcanbeobtainedbyclickingExport DCPdecryptioncertificate... fromtheKeystabofthePreferences
dialog(seeSection9.1.4).
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