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Comments Posted On :The Moving Picture: The Myth of the QuickTime Reference Movie


Posted By Neil Ghoshal on 3/30/2009 1:18:17 PM
Actually this is another HDV-is-the-exception-to-the-rule thing. Being recorded to tape as open-GOP (and when captured via FCP), a reference movie is, as mentioned, not possible. When attempting to create a reference movie with HDV media, FCP converts the media to 15 frame closed-GOP, which is actually what allows DVDSP to accept it without reprocessing.

Posted By Bruce Dixon on 3/30/2009 12:24:38 PM
Very interesting article. I am mostly an Avid user. QT Reference movies work well in Media Composer with a few notes. It won't work at all with long-GOP footage and it gets glitchy when mixing DV and non-DV footage. I think this because QT can "reference" only FRAMES, not GOPs. Since HDV and XDCAM don't actually have individual frames (they have 15-frame groups of pictures) it does not work with those file types. The only way to include long-GOP footage in a reference is to include the long-GOP footage in the file. But then it isn't really a reference movie anymore. It sounds like Apple will let you make a reference movie even if there is no real advantage. Avid won't let you do it when there is no advantage. Reference movies in Avid also have trouble when mixing DV and non-DV footage. I think this is because DV footage is 480 pixels tall and most other SD codecs are 486 pixels tall. Avid will make the movie but QT puts in strange level shifts or other anomalies when playing it. How does it work in Final Cut when mixing ProRes at 720 x 486 with DV footage at 720 x 480 ? Bruce

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