Canon XL1 3CCD Camcorder User Manual

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‐MotionJPEGis4:2:2,andmostimplementationsallowyoutospecifyadatarateorqualitylevel.

‐Typically,dataratesof50Mbpsorgreaterareconsideredbroadcastquality.



3.Uncompressedcodecs

‐Moreandmorecardssupporttrue4:2:2uncompressedvideo.Thedataratesarelarge,andthe

qualityisnobetterthanalosslesscompression.

‐Onesignificantadvantageofsomeuncompressedcodecsissupportfor10‐bit‐per‐channelcaptures,

whichcanperformbetterforanalogandespeciallySDIsources.‐High‐endvideoediting

applications,suchasAfterEffectsProfessional,areabletoprocessvideoinmorethan8bitsper

channel,improvingthequality.

‐Becauseuncompressedcodecshavesuchhighdatarates,youshoulduseafastdrivesystem,suchas

aRAID(redundantarrayofindependentdisks)system.



Exportingvideo



‐Iffeaturesinotherencodingtoolsarerequired,forexample,volumeencodingtomultipleoutput

formats,itisusefultoexportanintermediatefilefromthetimelineandusetheexportedfilefor

furtherprocessing.



Exportingtofile



Afileyouexportforlaterprocessingiscalledanintermediatefile.(Reasonforthis=toprovidehigh

qualityinthemostusefulformatwithoutintroducinganycompressionartifacts).



Choosingwhethertopreprocessortoavoidrendering



Whentoapplypreprocessing?Duringtherenderingphaseorlater?

‐Preprocessingduringrenderinggenerallyresultsinasmallerfile,butaddsmorerenderingtime.

‐Basically,toavoidrendering,youusethesamecodecandfileformatasyoursourcevideo.

‐Ifyoudon’tpreprocess,youdon’tneedtouncompressandthenrecompressunmodifiedframes—

instead,youcopythemfromthesourceintotheoutput.‐InAdobePremierePro,you’dturnoff

theRecompressoptionintheVideo

paneoftheExportMovieSettingsdialogbox.Forthisprocesstowork,thevideomusttrulybe

unchangedwiththesameframerate,framesize,pixelaspectratio,andsoon.Thesimplestwayto

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Canon XL1 3CCD Camcorder User Manual