• Adobe After Effects Expressions

  How to get current frame in expressions.

  Posted by Cory Weiner on April 5, 2008 at 10:02 pm

  I am trying to make the opacity of a video 0 on every even frame, and 100 on every odd. I have added an expression on the opacity of the video that looks like this:

  d = thisComp.frameDuration;
  if (d%2==0){
  opacity = 0;
  }else{
  opacity = 100;
  }

  but this does not change the opacity of the video at any time.

  how would I get the current frame number, then test every frame to see if it is even or odd and adjust the opacity accordingly.

  Jan Vork replied 13 years, 6 months ago 4 Members · 3 Replies
• 3 Replies

• 

  Dan Ebberts

  April 6, 2008 at 12:47 am

  See previous thread. 🙂

  Dan
• 

  Stephen Oberauer

  July 21, 2012 at 12:05 pm

  you could do this (where 25 is fps):

  (time * 25) % 2 == 0
• 

  Jan Vork

  November 12, 2012 at 2:21 pm

  For some reason, I get a rounding problem, where once in a while 2 frames get the same restult.

  This expression works better for me:

  C=((time*25)/2)-(Math.round((time*25)/2));
if (C==0)
{
100
}
else
{
0
}


  http://www.jaydude.nl

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