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Convert audio to keyframes then select all those below a given value ?
HI
Just wondering here if there was a method by which one could select keyframes of a property by their value.
Similar to selecting ‘of equal value’ but instead to select all keyframes below lets say a value of 20.
I am looking to use ‘Audio to keyframes’ and then tweak my resulting keyframes.
The returned values are all rather close.. from around 14 – 29 and each is different 29.1342 or 29.1346 so so it would be nice to create an on and off type result using those key frames. I know sound keys does something similar but just wondered if there was a way to ‘cheat’ that in AE.
To sum up. I want to be able to change all the keyframe values that are higher than 20 to a chosen value and all those above 20 to another chosen value.
Hope that makes sense and thanks in advance for any help 🙂We spent all the budget on doughnuts and now we have no money to make our film.
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6 Replies
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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
RenderBreak Blog – What I’m thinking when my workstation’s thinking
Creative Cow Forum Host: Live & Stage Events -
Thanks a lot. It is indeed simple and elegant.
ThanksWe spent all the budget on doughnuts and now we have no money to make our film.
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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.
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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
Latest AE Workshop – MoGraph Intensity – Shapes & TextIntensive mocha & AE Training in Singapore and Other Dangerous Locations
Imagineer Systems (mocha) Certified Instructor
& Adobe After Effects CS6 ACE/ACI -
Thanks very much.
I will for sure make a visit to the site mentionedWe spent all the budget on doughnuts and now we have no money to make our film.
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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 & TextIntensive mocha & AE Training in Singapore and Other Dangerous Locations
Imagineer Systems (mocha) Certified Instructor
& Adobe After Effects CS6 ACE/ACI
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