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Interpreting Footage

In most cases, Premiere Pro CS3 correctly interprets imported clips, accurately processing characteristics such as frame rate, pixel aspect ratio, and alpha channel. Nevertheless, sometimes you must override Premiere Pro CS3's assessment and specify how these characteristics should be interpreted. For example, a still image sequence may be designed to play at a particular frame rate that you need to set. Or an imported still image may appear distorted—a sure sign that its pixel aspect ratio (PAR) hasn't been interpreted correctly. Finally, you may need to manually specify how to handle a clip's alpha channel. In these situations, use the Interpret Footage command to set things right. As usual, Premiere Pro CS3 doesn't alter the source media file; it just processes it differently.

To set the frame rate or pixel aspect ratio of a clip:

  1. Select a clip, and choose File > Interpret Footage (Figure 4.36).
    Figure 4.36

    Figure 4.36 Select a clip, and choose File > Interpret Footage.

    The Interpret Footage dialog box appears.
  2. Select an option:
    • Use Frame Rate from File: Uses the file's inherent frame rate.
    • Assume This Frame Rate: Uses the frame rate that you enter here (Figure 4.37).
      Figure 4.37

      Figure 4.37 To use a frame rate different from that of the file, select Assume This Frame Rate and enter the rate, expressed in frames per second.

    • Use Pixel Aspect Ratio from File: Uses the PAR Premiere Pro CS3 assumed.
    • Conform To: Uses the alternative PAR you select from the drop-down menu (Figure 4.38).
      Figure 4.38

      Figure 4.38 To change the PAR, select Conform To and select an option from the drop-down menu.

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