Apple QuickTime Guide de l'utilisateur télécharger pdf (Page 23)

Chapter 3 Making and Editing QuickTime Movies With QuickTime Pro 23

Working With Audio Tracks

QuickTime audio includes music tracks, which contain MIDI files or other data, and

sound tracks, which contain digitized audio.

Adding an Audio Track to a QuickTime Movie

You can easily add audio and other tracks to a QuickTime movie. Usually the audio

track is laid down parallel to the video track.

To add an audio track to a movie:

1 In QuickTime Player, choose File > Import and select the audio file you want to import.

A new QuickTime Player window opens.

2 Choose Edit > Select All to select the entire audio file, then choose Edit > Copy.

3 Open the movie to which you want to add the audio, and position the playback head

at the location where you want the audio to start (unless you choose Add Scaled to

make the audio exactly fit the length of the movie).

4 Choose Edit > Add (or Add Scaled).

Add Scaled slows down or speeds up the audio track to fit the length of the movie.

(Choosing Add Scaled may change the pitch of the audio, so you might want to add

video to sound, and speed up or slow down the video to match the audio.)

Changing Sound Track Volume Levels

If you have QuickTime Pro, you can change the volume and balance of audio and music

tracks. For example, if a movie has more than one audio track, you can adjust the

volume of the tracks relative to one another.

To change volume and balance for an audio track:

1 In QuickTime Player, choose Movie > Get Movie Properties.

2 In the Properties window, choose the audio track from the left pop-up menu, then

choose Volume from the right pop-up menu.

3 Adjust the volume by dragging the Volume indicator bar to the right or left. Adjust the

balance by dragging the Balance indicator to the right or left of center.

To make the indicator bar snap to numerical values in increments of 25, hold down the

Option key (in Windows, the Alt key) and click in the Volume rectangle. To make the

balance indicator snap to specific positions, hold down the Option key (or Alt key) and

click the balance rectangle. The balance indicator snaps to Left, midway between Left

and Center, Center, midway between Center and Right, and Right.

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Apple QuickTime Guide de l'utilisateur Page 23