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Forums Adobe After Effects 24,000 fps, 23,98fps or 23,976 fps?

  • 24,000 fps, 23,98fps or 23,976 fps?

  • Matteo Ferreccio

    June 18, 2011 at 6:49 pm

    Which one frame rate has to be used for a high quality master copy of a short film (an uncompressed .mov in a Hard Disk) ?

    Master Copy has to be the starting point for DCP (Digital Cinema Packaging, 24,000?) and Blu Ray (23,976??).

    I cant figure out the right framerate. (The original footage is AVCHD 25fps but I want to convert it in 24p to achieve “film look”)

    so correct master copy 24p is…

    24,000 fps
    23,98 fps
    23,976 fps ???

    Thanks

  • Todd Kopriva

    June 18, 2011 at 8:29 pm

    23.976fps is the correct video frame rate. ‘23.98’ is just a shorter (and sloppier) way of representing ‘23.976’; the real number is still 23.976.

    23.976fps is used because it is very close to 24fps (the film frame rate), but it can be used by means of pull-down on equipment that was designed for 29.97fps NTSC video.

    Note that 23.976 = 24 * 999/1000, just like 29.97 = 30 * 999/1000 .

    ———————————————————————————————————
    Todd Kopriva, Adobe Systems Incorporated
    Technical Support for professional video software
    After Effects Help & Support
    Premiere Pro Help & Support
    ———————————————————————————————————

  • Matteo Ferreccio

    June 19, 2011 at 1:25 am

    Thanks. I typed 23,98 along with 23,976 because it is the frame rate that I read in specifications of iTunes HD Trailers.

    Well, that said, due to its destination for cinema projecting in DCP, and its mastering in Blu Ray (no one NTSC-based destination), which framerate have I to render the uncompressed .mov? 23,976fps or 24,000fps?

  • Walter Soyka

    June 19, 2011 at 6:30 pm

    [Matteo Ferreccio] “due to its destination for cinema projecting in DCP, and its mastering in Blu Ray (no one NTSC-based destination), which framerate have I to render the uncompressed .mov? 23,976fps or 24,000fps?”

    I believe that DCI-compliant DCP must be 24.0 fps. In my experience, Blu-ray is usually 23.976, but could be either. I have a US/NTSC frame rate bias.

    You should check deliverables requirements with whomever is handling the DCP and Blu-ray production.

    Walter Soyka
    Principal & Designer at Keen Live
    Motion Graphics, Widescreen Events, Presentation Design, and Consulting
    RenderBreak Blog – What I’m thinking when my workstation’s thinking
    Creative Cow Forum Host: Live & Stage Events

  • Todd Kopriva

    June 19, 2011 at 6:31 pm

    As usual, Walter is correct on all points.

    ———————————————————————————————————
    Todd Kopriva, Adobe Systems Incorporated
    Technical Support for professional video software
    After Effects Help & Support
    Premiere Pro Help & Support
    ———————————————————————————————————

  • Matteo Ferreccio

    June 19, 2011 at 8:38 pm

    [Todd Kopriva] “As usual, Walter is correct on all points.”

    Yeah, well i’ll go for 24,000 fps. Thank you both very much for sharing your experience, bye!

  • Russell Lasson

    August 12, 2011 at 2:56 am

    I know it’s probably too late now, but I would suggest using 23.976 as the master. It makes things more compatible with NTSC broadcast. I create a lot of DCPs and the conversion from 23.976 to 24 is easy to deal with. But burning a 24fps blu-ray or dvd instead of a 23.976 fps version can cause problems.

    Russ

    Russell Lasson
    Colorist/Digital Cinema Specialist
    Color Mill
    Salt Lake City, UT
    http://www.colormill.net

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