1 Reply Latest reply on Sep 27, 2013 4:31 PM by Dave LaRonde

    Confusion with setting Comp Frame Rate

    Cris is Bliss Level 1

      I'm a little confused with the implications of setting the wrong frame rate.  My camera can record at 23.976  However the manufacturer sometimes refers to this setting as 24p in the manual.  I read that there is no harm in using 24p if the comp is a few second long.  But issues will arrise if the comp is longer and you are tracking.  On the other hand Mocha specifies that you be precise in choosing your frame rate.  Does the .024 difference make any real difference??

       

      If 24 fps is the film standard why did camera manufacturers make their cameras record at 23.976, or is film also 23.976 and its just referred to as 24p.  23.976, 24, 25, 29.97, 30, 59.94, 60 they're all so close

       

      Also what are the consequences of rending out to different frame rate

       

      Thank you in advance

       

      CS5.5

        • 1. Re: Confusion with setting Comp Frame Rate
          Dave LaRonde Level 6

          If 24 fps is the film standard why did camera manufacturers make their cameras record at 23.976, or is film also 23.976 and its just referred to as 24p.  23.976, 24, 25, 29.97, 30, 59.94, 60 they're all so close

           

          Also what are the consequences of rending out to different frame rate

           

          Thank you in advance

          You can blame the NTSC Color Television standard for the weird frame rate.  At one time it really was 30fps.  Those were the days of black-and-white TV ONLY.  Engineers worked mightily to come up with a color system that was compatible with millions of existing B&W sets, and they finally got it.  But to accommodate a color signal, they need a tiny bit more information in each frame. The NTSC signal was jam-packed already and something had to give, so they slowed the frame rate down a little bit.

           

          Thus, 30 fps became 29.97... and in direct proportion, 24 fps became 23.976.  Just learn to live with it.

           

          "Yeah, well how can you have .976 of a frame?"

           

          You can't.  But a frame rate NOT a count of the number of frames in a second. It is is really A MEASURE OF TIME.  In PAL-Land, a frame is 1/25 second.  In Hollywood, a frame is 1/24 second.   In NTSC Days Of Yore, a frame was 1/30 second.  But since 1953, it's been 1/29.97 second.

           

          Don't obsess over 29.97 and 23.976.  Just use them and get used to them.  Don't try put 29.97 footage into into a 30 fps comp, or 23.976 footage into a 24fps comp just 'cause you like nice integer numbers.  If you do, the motion of the images you shoot can go all screwy.  Don't do it.  Don't.

           

          End of sermon.