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Position animation triggered by audio
Hi,
I need to write expression for position that will be triggered when audio pass specific value and it can repeat multiple throw video.
I tried with:if(thisComp.layer(“muzika”).effect(“Both Channels”)(“Slider”)>=85){
[100,100]}
else{[0,0]}
And it works, but I want to add linear expression to y position, but dont know how to write to get time value
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4 Replies
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Hi Ivan !
instead of [100, 100] you could write something like:
linear(time, 0, 1, 0, 100)
It converts time from 0 second to 1 second to the position 0 to 100. Feel free to play with the values. Also if you want something a bit smoother, you can change the word “linear” to ease, easeIn or easeOut
Enjoy !
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Thanks for the answer, but what would happen if animation need to start again before previous one isnt finished.
Animation need to follow bass on music, so i may happen there are overlapping
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Also if i writte expresion just with if and linear, it while now execute, beacuse next frame value is less then 85, and it back [0,0]
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I found solution that work for me, here is expression:
threshold = 85.0;
audioLev = thisComp.layer("Audio Amplitude").effect("Both Channels")("Slider");
above = false;
frame = Math.round(time / thisComp.frameDuration);
while (true){
t = frame * thisComp.frameDuration;
if (above){
if (audioLev.valueAtTime(t) < threshold){
frame++;
break;
}
}else if (audioLev.valueAtTime(t) >= threshold){
above = true;
}
if (frame == 0){
break;
}
frame--
}
if (! above){
t = 0;
}else{
t = time - frame * thisComp.frameDuration;
}
[easeOut(t,0,1/2.5,0,1920),value[1]]
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