Audio files – Apple Motion 4 User Manual
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The only time it really matters which kind of alpha channel an object has is when Motion
doesn’t correctly determine it. If an object’s alpha channel has been set to Straight in the
Media tab when it’s really premultiplied, it may appear fringed with the premultiplied
color around its edges. If this happens, you can select the problematic clip in the Media
tab of the Project pane, then change its Alpha Type parameter in the Media tab of the
Inspector.
Audio Files
You can import different audio file formats into your project, including but not limited
to WAV, AIFF, .cdda, MP3, and AAC. Although Motion is not necessarily intended to be a
full-featured audio editing and mixing environment such as GarageBand, Soundtrack Pro,
or Logic Pro, you can import music clips, dialogue, and sound effects to use in your
projects. If you import a QuickTime file with mono or stereo tracks of audio, the video
appears in the Timeline, while the audio appears in the Audio Editor.
From within Motion, you can select an audio file and open Soundtrack Pro to modify the
audio file. Once saved in Soundtrack Pro, the file is automatically updated in Motion. For
more information, see
Using Soundtrack Pro with Motion
You can freely import audio clips with different sample rates and bit depths. When you
do, Motion resamples any audio tracks that need it to the sample rate and bit depth
currently in use by your computer. The default is 16-bit, 44.1 kHz float for the built-in
audio interface. If you use a third-party audio interface, audio is remixed to the sample
rate and bit depth used by that device.
You can import audio files with sample rates up to 192 kHz, and with bit depths up to
32 bits. Mono and stereo files are supported. Multi-channel audio files are also supported.
Motion supports as many layers of audio as you want to use in the Audio Editor, although
mixing many audio tracks together may affect playback performance. In the Audio Editor,
you use the same tools and commands to edit audio objects as you use in the Timeline
layers list. Each audio layer also has individual settings for level and pan, so that you can
mix a group of tracks together for stereo output.
For more information about file formats supported by Motion, see
. For
more information on using audio in Motion, see
A seamless way to browse for and import music from your iTunes library is to use the
Music category in the Motion Library. For more information, see
.
Note: You cannot import rights-managed AAC files, such as non-iTunes Plus tracks
purchased from the iTunes Store.
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Chapter 6
Creating and Managing Projects