Linking the speed of a clip to the amplitude of an audio file

[Kalysta243047279fi6]

Hello, I am working for visuals for a music upload on youtube and I want the playback speed of a clip to be linked to the amplitude of a sound.

I linked stuff to audio amplitude multiple times in the past like a clip's scale or something.

My guess is this time I have to link Time Remapping of the clip to the audio amplitude and change the expression to an addition. But no matter what the expression is always an error. Even just by default linking the time remapping to the amplitude gives me an error.

Help appreciated

[Dan Ebberts · Accepted solution]

I think this will work for that:

http://www.motionscript.com/articles/speed-control.html#other-applications

[Kalysta243047279fi6]

I tried pasting the code presented on that page into the time remapping expression and it's still an error. I don't comprehend that code enough to troubleshoot it

[Dan Ebberts]

Hard to say without seeing the error message, but the expression assumes you have used Animation > Keyframe Assistant > Convert Audio to Keyframes on your audio layer to generate an "Audio Amplitude" layer with a slider named "Both Channels". Other than that, I can't think of a reason it wouldn't work.

[Kalysta243047279fi6]

My mistake. What I didn't realize was my AE is in french and some elements in the expression programming are in french such as "Amplitude audio" rather than "Audio amplitude", "Les deux couches" rather than "Both Channels" and "Curseur" rather than "Slider".

[Kalysta243047279fi6]

Thanks a lot! with a bit of tweaking this expression works really well! thank you for linking me that I appreciate it 🙂

[Mathias Moehl]

If you don't want to write expressions, this tutorial (which uses my paid extension BeatEdit for Ae) uses another very flexible and powerful workflow to time-remap videos in sync with the beat:

Short version:

Long Version