Footage speed up corresponding with Audio!

I know that it is possible to do a logo shaking or pulse audio in the background exceed a certain level. Is it possible for a film speed up after audio exceeds a certain level. So my project's images of flying in the clouds, and I have music in the background, I need the film to accelerate after audio exceeds the level I want it. Is this possible?

Writing expressions that speed up and slow down time-remapping is quite complicated. When you enable the time remapping effect you get two keyframes, one at the beginning of the layer and the other at the end. You can then delete the keyframe at the end that essentially freezes the video or animation on the first image. You then add a phrase like this and the video will play at half speed:

time * 2

To play at double speed, you can replace the expression at the time *.5

The complexity comes when you want normal speed ramp (time * 1) to four times normal speed (time *. 25) because the math and calculations get very uncomfortable. Dan Ebberts, the Dean of the expressions, has an excellent article on its website that will point you in the right direction. Find it here: Expression of speed and frequency

At the bottom of the article is an example that uses audio to speed up and slow down a clip with this expression and the Audio to keyframes keyframe assistant:

SPD = thisComp.layer("Audio_Amplitude").effect ("the two Channels")("Slider");

mult =. 5;

n = spd.numKeys;

If (n > 0 & .time spd.key (1))<>

Accum = spd.key (1) .value * (spd.key (1) .time - inPoint);

for (i = 2; I have<= n;="">

If (spd.key (i) .time > time) break;

K1 = spd.key(i-1);

K2 = spd.key (i);

Accum += (k1.value + k2.value) * (k2.time - k1.time) / 2;

}

Accum += (spd.value + spd.key(i-1).value) * (time - spd.key(i-1).time) / 2;

} else {}

Accum = spd.value* (time - inPoint);

}

accum + value * mult

It would be a good starting point. You add your own cursor, and replace the layer Audio Amplitude in the first line, and then to keyframe changes speed.

Here's one more thing that will make the process easier if you cut your video clip in the model. If you activate the effect time remap keyframes will be placed at the head and the tail of the clip, not the in and out point. If you choose layer > time > Freeze Frame, you will get a keyframe in ICT. This makes things much easier to work with. You'll probably also want to 0 the value of time code at beginning of your publication

Tags: After Effects

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