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Interpreting 60fps to 24fps - Dropped Frames

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Megan CarrollInterpreting 60fps to 24fps - Dropped Frames
by on Jul 15, 2015 at 4:42:22 pm

I shot some footage on a Sony a7s at 59.94 fps so that I could slow it down in post to achieve a smoother camera movement. But when I interpret it to 23.976 fps in Premiere, it looks like it's dropping frames. It looks super glichy and terrible. What can I do to slow the footage down so that it looks smooth?

I am especially confused because I've used this technique in the past with footage shot on a Canon Mark III and footage recorded through a Shogun. When I interpret that footage to 23.976, it looks perfectly smooth.

Things I have tried with the Sony footage, none of which worked:
  • Interpreting to 23.976

  • Dragging 59.94 clip to 23.976 sequence and slowing it down to 50%

  • Frame blending

  • Opening the clip in After Effects and interpreting to 23.976

  • Selecting "Pixel Motion Blur" on the interpreted AE clip


  • Any help would be much appreciated.


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    Megan CarrollRe: Interpreting 60fps to 24fps - Dropped Frames
    by on Jul 15, 2015 at 4:51:40 pm

    I don't know if this information helps diagnose my problem, but when I scrub through the interpreted clip frame by frame, it looks like it has duplicated every frame. Each frame is held for the length of two frames.


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    Shane RossRe: Interpreting 60fps to 24fps - Dropped Frames
    by on Jul 15, 2015 at 7:34:56 pm

    Are you sure you shot 59.94p? Sounds like you shot 59.94i. That's 29.97fps and interlaced. That format should never be called that. It should be called 29.97i

    Shane
    Little Frog Post
    Read my blog, Little Frog in High Def


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    Megan CarrollRe: Interpreting 60fps to 24fps - Dropped Frames
    by on Jul 15, 2015 at 8:13:09 pm

    Yes, I'm sure I shot 59.94. I actually figured out the problem though. My shutter speed was not set high enough. Turns out it needs to be at least double the frame rate. Makes sense, but I didn't even think about it when I was shooting.


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