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Chapter 4. Editing Source Clips > Setting Precise Audio In Points

Setting Precise Audio In Points

Setting an in or out point can be compared with cutting film between image frames. Naturally, you can’t cut in the middle of a frame. In Premiere, frame divisions are set by the timebase of the project, which is based on one of several standard frame rates: 24 fps film, 25 fps PAL video, 29.97 fps NTSC video, or 30 fps video.

Digital audio, however, isn’t based on video frame rates, but on audio sample rates. A CD-quality sample rate is 44.1 kHz, or approximately 44,100 samples per second. Therefore, it’s possible to cut audio much more finely than video.

In Premiere, you can take advantage of audio’s more-precise time divisions by setting audio in points based on samples, rather than frames. Out points, however, are constrained to the project’s timebase divisions.

To set an audio in point based on samples:

1.
-click (Mac) or -click (Windows) an audio clip to view it in a separate clip window (Figure 4.48).

Figure 4.48. Open an audio clip in a clip window.


Though you can set a sample-based in point using the source window, a separate clip window allows you to view its waveform (see “Using Audio-Clip Windows” earlier in this chapter).

2.
Choose Window > Window Options > Clip Window Options (Figure 4.49).

Figure 4.49. Choose Window > Window Options > Clip Window Options.


The Clip Window Options dialog box appears (Figure 4.50).

Figure 4.50. The Clip Window Options dialog box lets you change the counting method from the relatively crude video frame rate to a more precise rate.


3.
From the Count pull-down menu, choose Frames/Samples (Figure 4.51) and click OK.

Figure 4.51. Choose Frames/Samples from the Count pull-down menu.


The time display of the clip window displays frames and audio samples. Clicking the frame-advance button moves the clip forward only one audio sample at a time.

4.
Cue the audio to the point where you want the clip to start, and click the mark in button or press (Figure 4.52).

Figure 4.52. The audio-clip window’s time display uses frames and samples. You can cue the clip to the sample you want and click the mark in button.


The in point is based on audio samples of the clip. The out point must be based on the timebase divisions that you set for the project.

You can reset the time display without disturbing the audio in point.

Tip

  • For more about audio sample rates, refer to Chapter 18.


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