Convert audio to keyframes then select all those below a given value ?

[Walter Soyka]

This is very easy with an expression.

Alt-click the stopwatch for the property with the keyframes (such as Both Channels) and enter the following expression:

if (value > 20) 100 else 0;

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
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[Peter Dexter]

Thanks a lot. It is indeed simple and elegant.
Thanks

We spent all the budget on doughnuts and now we have no money to make our film.

[Peter Dexter]

Thanks again that is great. Just one little thing. I used action script 2 years ago quite a bit so it is all rather vague these days. I am sure that I can use that little snippet and tweak it.

I want to use it with a slider and an existing expression.

I have this on my slider: effect(“Both Channels”)(1)
and this on my opacity property: thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”)

If you had an example how to integrate the: If (value > 20) 100 else 0:
In either of those lines it would be great.

Also to extend the if else so that: if greater than twenty but less than twenty five 100 if greater than 25 80 else 0

That would make my day. I think I could roll from there and then find a good basic expressions page somewhere to embeish.

Expressions are addictive 🙂

We spent all the budget on doughnuts and now we have no money to make our film.

[Roland R. kahlenberg]

This should do it –

propVal = thisComp.layer("Audio Amplitude").effect("Both Channels")("Slider");

if (propVal > 25) {
80
} else if (propVal > 20 && propVal < 25) {
100
} else {
0
}

I’ve found this URL a good resource for Javascript Conditionals – https://stackoverflow.com/questions/253030/best-way-to-format-if-statement-with-multiple-conditions.

https://www.w3schools.com/ is also good.

HTH
RoRK
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[Peter Dexter]

Thanks very much.
I will for sure make a visit to the site mentioned

We spent all the budget on doughnuts and now we have no money to make our film.

[Roland R. kahlenberg]

I’ve just realized that there is an issue with the script if the referenced value is at exactly 25. Currently, a value of 25, for the referenced property, will result in an opacity value of 0.

If that is not intended behavior, then add an = sign to either one of the two explicit conditionals in the script – something like this:

if (propVal >= 25) OR
(propVal > 20 && propVal <= 25)

HTH
RoRK
Latest AE Workshop – MoGraph Intensity – Shapes & Text

Intensive mocha & AE Training in Singapore and Other Dangerous Locations

Imagineer Systems (mocha) Certified Instructor
& Adobe After Effects CS6 ACE/ACI