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time expression
Hey everyone !
Anyone knows if there is a way to do something like this:
If a value is above zero start playing a video from start ( with time remap), else stop.
Meaning everytime a character talks I can have the content of the video played from the start each time.
we are doing a split screen, and I need to have 2 logos animating once from start each time one of two characters talking and I find a bit tiedious to make it by hand as there are many layers that need this treatment.
Thanks !
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6 Replies
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Something like this might work. Adjust the threshold value to what works best for you:
aud = thisComp.layer("Audio Amplitude").effect("Both Channels")("Slider");
threshold = 5;
val = 0;
if (aud.value > threshold){
t = time - thisComp.frameDuration;
while (t > 0){
if (aud.valueAtTime(t) < threshold) break;
t -= thisComp.frameDuration;
}
val = time - t;
}
val
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oh this is great ! thanks so much.
I am trying now to adapt your expression to not start from 0 each time and I thought removing val =0; would be enough but I get an error…
any chance you provide a solution also for this one.oh I wish I could solve this alone but my maths are a bit rusted
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I think this is what you mean. Just adjust tStart to where you want playback to begin:
aud = thisComp.layer("Audio Amplitude").effect("Both Channels")("Slider");
threshold = 5;
tStart = 1;
val = tStart;
if (aud.value > threshold){
t = time - thisComp.frameDuration;
while (t > 0){
if (aud.valueAtTime(t) < threshold) break;
t -= thisComp.frameDuration;
}
val += time - t;
}
val
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when the voice goes down, I need the comp to stay where it is and then continue from there when the sound goes up again I need the video to continue playing from the same point
currently when the sound goes down the video is going to a fixed timecode
I need Val to not be set to 0 at the start of each frame.
I don’t want it to be a loop any more, I want it to be on offset mode (as if using loopOut)
I have another video that don’t need to be looped.
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That’s quite different. This should work, but it might become a processor hog if your comp gets too long:
aud = thisComp.layer("Audio Amplitude").effect("Both Channels")("Slider");
threshold = 5;
tStart = 0;
runFrames = 0;
f = timeToFrames(time);
while (f >= 0 ){
if (aud.valueAtTime(framesToTime(f)) > threshold){
runFrames++;
}
f--;
}
tStart + framesToTime(runFrames)
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thiis is brilliant thanks so much.
I thought it would be much more easier, but the way you count the frames was actually not easy enough to find by myself
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