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Chapter 4. Managing Clips > Interpreting Footage

Interpreting Footage

In most cases, Premiere Pro correctly interprets imported clips, accurately processing characteristics such as frame rate, pixel aspect ratio, and alpha channel. Nevertheless, sometimes you must override Premiere Pro'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 has not 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 doesn't alter the source media file; it just processes it differently.

To set the frame rate of a clip

1.
Select a clip and choose File > Interpret Footage (Figure 4.59).

Figure 4.59. Select a clip and choose File > Interpret Footage.


The Interpret Footage dialog box appears.

2.
In the Interpret Footage dialog box, 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 4.60).

Figure 4.60. 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.


To set the pixel aspect ratio of a clip

1.
Select a clip and choose File > Interpret Footage.

The Interpret Footage dialog box appears.

2.
In the Pixel Aspect Ratio area of the Interpret Footage dialog box, select an option:

Use Pixel Aspect Ratio from File: Uses the pixel aspect ratio Premiere Pro assumed.

Conform To: Uses the alternative pixel aspect ratio you select from the drop-down menu (Figure 4.61).

Figure 4.61. To change the pixel aspect ratio, select Conform To and select an option from the drop-down menu.


To ignore or invert a clip's alpha channel

1.
Select a clip and choose File > Interpret Footage.

The Interpret Footage dialog box appears.

2.
In the Alpha Channel area of the Interpret Footage dialog box, select the options you want (Figure 4.62):

Figure 4.62. In the Interpret Footage dialog box, specify whether to ignore or invert the clip's alpha channel.


Ignore Alpha Channel: Disregards the clip's alpha channel so that it doesn't define transparent areas when the clip is added to video track 2 and higher.

Invert Alpha Channel: Reverses the transparent and opaque areas defined by the clip's alpha channel.

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