Looping the audio track

Supported audio file formats

You can import any of the following types of audio files into After Effects:

􀁴 Adobe Sound Document (ASND; multitrack files import as merged single track)

􀁴 Advanced Audio Coding (AAC, M4A)

􀁴 Audio Interchange File Format (AIF, AIFF)

􀁴 MP3 (MP3, MPEG, MPG, MPA, MPE)

􀁴 Video for Windows (AVI, WAV; requires QuickTime on Mac OS)

􀁴 Waveform (WAV)

The duration of the piano layer isn’t as long as the composition, so you’ll need to loop it. Luckily, this music track has been composed to loop cleanly. You’re going to loop the audio clip using the time-remapping feature. You’ll learn to use time remapping in more depth in Lesson 6, “Animating Layers.”

1 Select the piano.wav layer in the Timeline panel.

2 Choose Layer > Time > Enable Time Remapping. A Time Remap property appears for the layer in the Timeline panel, and two Time Remap keyframes appear for the layer in the time ruler.

3 Alt-click (Windows) or Option-click (Mac OS) the stopwatch icon () forthe layer’s Time Remap property. This sets the default expression for time remapping; it has no immediate effect in the Composition panel.

4 In the Expression: Time Remap property for the piano layer, click the Expression Language pop-up menu and chooe Property > loopOut(type = "cycle", numKeyframes = 0).

The audio is now set to loop in a cycle, repeating the clip endlessly. All you need to do is extend the Out point of the layer to the end of the composition.

5 Select the piano layer in the Timeline panel, and go to the end of the time ruler. Then press Alt+] (Windows) or Option+] (Mac OS) to extend the layer to the end of the composition. You’ll preview the entire composition soon.

6 Hide the piano layer’s properties, and then choose File > Save to save your work.

Дата добавления: 2014-11-20