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Linking audio amplitude to PNG sequence?
This feels like a FAQ, and yet I can’t really pinpoint what I’m after in any of the plethora of discussions on linking audio amplitude.
Basically, I’ve got this sequence of 28 PNG files which happen to represent a person’s face. Frame 0 has the mouth fully closed. Frame 28 has it fully open. And what I’m after is an expression which will result in AE displaying a frame number which corresponds to the amplitude of a given WAV file. Ie, #0 for no audio, and #28 for max amplitude, with all the gradients in between properly represented (so #14 or #15 for amplitude at 50%, for example).
Really the only thing I don’t yet know is how to tell AE to display a specific frame of a given video. With that knowledge in hand, I expect I could do whatever math and calibration would be needed to produce a good result.
Hopefully the info would be useful to other folks, too.
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1 Reply
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You need turn on time-remapping for your PNG sequence and use a time remapping expression something like this:
minAudio = 0;
maxAudio = 15;
maxFrame = 28;audioLev = thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”);
f = Math.round(linear(audioLev,minAudio,maxAudio,0,maxFrame));
f*thisComp.frameDuration
Dan
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