• Adobe After Effects Expressions

  making a text layer display the frame number where other layer is transparent

  Posted by Magali Zadoff on December 1, 2018 at 2:03 pm

  Hi,
  I’m trying to write an expression to know where is the last frame with any image on a precomp. That precomp is a 3 to 6 minutes long layer that contains a video that will change once a day, and every time it has a different length.
  So I need to find its last frame quickly (without going into the precomp to look because it doesn’t have a visible end, but its last part is offline) .
  So I think I can write this expression in a guide text layer that find the first empty frame (after I get the empty frame I’ll change it to find offline bars frame) and display the frame number.

  Up to now I have this, but it is returning “[object Group]”.
  Can anybody help me with this?

  Thanks so much in advance!
  —

  Hey, I wanted to delete this post since I found the solution, but posts can’t be deleted, so I’ll paste the correct expression here so if someone needs the same thing this can be useful:
  target = thisComp.layer(“Sequence”);
  outP = target.outPoint;
  outPF = timeToFrames(outP, 1.0 / thisComp.frameDuration, isDuration = false);
  ppio = timeToFrames(target.inPoint, 1.0 / thisComp.frameDuration, false);

  i = ppio;
  while (i < outPF) { FF = framesToTime(i, 1.0 / thisComp.frameDuration); resultado = target.sampleImage(transform.position, [width, height]/2, true, FF); if (resultado[3] == 0) { break; } else{ i++; } } Ti = framesToTime(i, 1.0 / thisComp.frameDuration); TC = timeToTimecode(Ti, timecodeBase = 30, isDuration = false) TC

  Magali Zadoff replied 7 years, 9 months ago 1 Member · 0 Replies
• 0 Replies

Reply to this Discussion! Login or Sign Up