I have a picture :Girl staring at the city at night wallpaper - Anime wallpapers - #222
And in it I want to make the city lights and stars pulse to the beat of my song, how would I go about doing that?
Take the audio into Audition. Play with the EQ until you isolate the beat. Export it, then import into AE. Put in the timeline and use AE's Convert Audio to Keyframes. Use the keyframes however you'd like.
Dave LaRonde wrote:
Use the keyframes however you'd like.
In this case, you'd probably want to use a linear() expression to control the brightness of the lights. This might be done by using a Glow effect on an adjustment layer to make the lights pop - and an expression on the opacity to make it respond.