Comments on: Smart Volume Meter

By: Declan

Declan — Sun, 05 Feb 2012 20:50:21 +0000

I know I’m a bit late to this party, but I now learned that globals don’t exist, however, your tutorial has spurred me on learn about expressions. So to round up this one, I have added a “MaxValue” slider and a “ShowMaxValue” checkbox. Clicking the checkbox shows the max value, then you can set the “MaxValue’ slider to that for lighting speed render time!. Expression as below:

sld=effect(“Both Channels”)(“Slider”);

if (effect(“ShowMaxValue”)(“Checkbox”) == 1) {
max=0;
this.frame=timeToFrames(t = time + thisComp.displayStartTime, fps = 1.0 / thisComp.frameDuration, isDuration = false);
compDuration=timeToFrames(t = time + thisComp.duration, fps = 1.0 / thisComp.frameDuration, isDuration = false);
for (i = 1; i max) max=val;
}
result=max;
} else {
max=effect(“MaxValue”)(“Slider”);
result=linear(sld, 0, max, 0, 100);
}
result;

By: Declan

Declan — Sun, 05 Feb 2012 14:25:14 +0000

Hi,
Thanks again for another amazing tutorial. One thing I did notice was the render speed is slow due to the for loop on every frame. Not sure if there is a way to store global variables so the loop only executes once, but what I did was got it to set the sider to the max value, then copied that max value into the linear function and removed the ‘for’ loop. It renders soooo quick, but obviously if you changed the music you would need the loop to find the max value. Great tutorial, learned much!

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