Opacity Pickwhip to Audio Keyframes

Question

Hey guys I am trying to create a neon box around a subject and have the glow flicker to a certain db range of the audio file. I've done this for scale before and the expression is relatively easy to set a thresh hold but opacity doesn't seem to work as friendly. I have got it semi working but I have no expression to control the opacity min/max and no expression to control which frequency the opacity reacts to. Any help would be greatly appreciated. I just simply want the glow to come in and out to a certain range of the beat.

Not great with expressions so keep that in mind in case it's really advanced lol. Still learning the expressions side and how the coding works.

Thanks in advance for any help!

Dan Ebberts · Accepted Answer

You may not have the audio range (audioMin and audioMax) set up to give you the best effect. I notice from your screen cap that the slider value is 14.81 which would peg the opacity at 100%. It would be helpful to see the actual range of the audio keyframes in the graph editor.

Mylenium · Answer

You cannot extract specific frequencies with expressions, so this alone makes no sense. You have to process the audio in a respective program and save a version of it to be used as the reference for your expressions. To some degree you may be able to do that in AE with the very limited audio effects in a pre-composition. The rest isn't clear. Since scale and opacity basically work the same, you should not have any issues to feed the same ranges into your code, but perhaps there needs to be some tweaking or a linear() function in there to remap the ranges. Either way, you need to provide a better explanation of what you want to achieve rather than just describing the problem.

Mylenium

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