Canon XL1 3CCD Camcorder User Manual

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ensurethatnochangesweremadetothevideoistousethesameprojectpresetforexportthatwas

usedforimport,whichisthedefaultbehaviorinAdobePremierePro.

‐Thereisoneexceptiontoexportingwiththesourcecodec:whenthesourceisDV25andcontainsa

numberofmotiongraphicsorcompositing.

‐Whenyoupreprocess,choosethehighestframerateandlargestframesizethatyouwilluse.Ifyou

aretargetingwebcodecs,usesquarepixels(pixelaspectratioof1).



Choosingafileformatforrendering



‐ThemostcommonformatsareQuickTimeandAVI;bothoffergood‐qualityintermediatecodecs.

‐YoucanalsouseMPEG‐2athighdatarates.

‐Itisessentialtomakesurethattheencodingtoolsupportsthefileformat.



Choosingacodecforexporting



‐Whenyouexportanintermediatefile,pickacodecandadataratethatdoesn’tintroduce

compressionartifacts.

‐Whenyouarenotpreprocessing,it’stypicaltousethesourcecodecorMotion

JPEG.WhenyouuseMotionJPEG,useitinsinglefieldwhenyouexportasprogressivescan,or

interlacedwhenyouexportasinterlaced.

‐ForAVIfilesonWindows,theHuffyuvcodecisquitepopular.



Understandingpreprocessing



‐Preprocessingisthemiddlestepofvideocompressionandinvolvestransformingthedecodedframe

ofthesourcevideointotheoptimizedframegiventothecodec.–Goal=totransformthevideointo

thefinalformat.

‐Preprocessingisveryimportantforquality,andgettingitrightcandramaticallyimprovethequality

ofthefinalvideo.Awellpreprocessedvideocanlookbetterthanthesamesourcefilepoorly

preprocessed,butcanbeencodedattwicethedatarate.



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Canon XL1 3CCD Camcorder User Manual