Skip to main content
K
kw15694493
Participant
January 22, 2025
Answered

Help with expression controlling opacity

  • January 22, 2025
  • 1 reply
  • 546 views

Hi all,

 

I'm working on a visualizer for a podcast. I want to set it so that each speaker's picture only appears when they're speaking. This is the expression I'm using on the opacity of the picture, which references the audio keyframes:

 

speaker1 = thisComp.layer("speaker1").effect("Both Channels")("Slider");

if ( speaker1 >= 1 ) {
100;
} 

else {
0;
}

 

This is working as it should, but the issue is the image flickers on and off for things like pauses between words, and breaks in laughs. In addition I feel like the animation would be more visually smooth if the picture lingered for a moment instead of turning off immediately when the speaking stops.

 

Is there a way I can add some kind of condition instead of the else statement here? Something like, if speaker1 < 1 and has been so for at least 20 frames, then the opacity = 0. I'm fairly new to expressions so I don't quite know where to start.

 

Thank you.

Correct answer Dan Ebberts

You could try something like this:

speaker1 = thisComp.layer("speaker1").effect("Both Channels")("Slider");
threshold = 3;
gap = 20;
val = 100;
if (speaker1 < threshold){
  for (i = 1; i < gap; i++){
    if (speaker1.valueAtTime(time - framesToTime(i)) >= threshold) break;
  }
  if (i == gap){
    val = 0;
  }
}
val

1 reply

Dan Ebberts
Community Expert
Dan EbbertsCommunity ExpertCorrect answer
Community Expert
January 22, 2025

You could try something like this:

speaker1 = thisComp.layer("speaker1").effect("Both Channels")("Slider");
threshold = 3;
gap = 20;
val = 100;
if (speaker1 < threshold){
  for (i = 1; i < gap; i++){
    if (speaker1.valueAtTime(time - framesToTime(i)) >= threshold) break;
  }
  if (i == gap){
    val = 0;
  }
}
val
K
kw15694493Author
Participant
January 22, 2025

This works perfectly! Thank you so much.

Terms & ConditionsAccessibility statement
Using the community Terms of use Privacy Cookie preferences Do not sell or share my personal information ad choicesAdChoices