Thread: 24p questions, workflow issues.

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  1. #1 24p questions, workflow issues. 
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    Oct 2008
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    Mumbai, India
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    I posted this over on dvxuser but didn't get any responses. I'm looking for an informed official workflow for this as 24p HD post-prod is new for me.

    Thanks for your patience as I'm sure this question has been answered ad nauseam throughout time. Through searching forums I've found so much contradicting seemingly outdated information about this subject that I've had enough. I need some guidance from people who really understand this thoroughly. Please no speculation.

    1. We shot a corporate at 24p on the HPX-170. (no 24pA, no 24pN... just 24p)

    2. We imported into FCP 5.1 using ''Import P2''. Resulting clips read as 29.97fps in Quicktime and when played in QT show a 2:3:2:3 pulldown pattern. In scanning through frame by frame it's 2 frames interlaced, then 3 frames prog.

    3. Easy Setup for FCP project was DVCPRO HD 1080i60. Sequence settings are DVCPRO HD 1080i60 on a 29.97 editing timebase.

    4. Edited everything together, motion is smooth. No apparent pulldown pattern on the footage when watching in Final Cut's interface.

    5. Exported the sequence using Export-Quicktime keeping the current settings.

    This is where everything started looking weird. The exported QT file has the 2:3:2:3 pulldown pattern on it. Interlacing artifacts everywhere. So I tried running a reverse telecine on a clip, then exported using current settings again and this seemed to work.

    Where do I go wrong in this workflow? Is there a way to batch reverse telecine all the clips so I can export a normal sequence without interlacing? What exactly is going on in these codecs behind the scenes? Does the HPX-170, while in 1080i60 running 24p still apply a native 2:3:2:3 pulldown while recording? Should I be doing a reverse telecine before editing or import? What's the common best workflow here?

    Thanks in advance and sorry for what is probably a repeating question, if you can link current up to date information about this it would be greatly appreciated.

    Thanks again and cheers,
    Patrick Kaplin
    Mumbai, India
    http://www.patrickkaplin.com
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  2. #2  
    when shooting 24p with the HPX170 the first frame is recorded 3X the second is 2X the 60 frames are converted to 24p via a 3:2 pulldown not a 2:3 pulldown.
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