In the Project panel, right-click (Windows)
or Ctrl-click (Mac OS) the clip for which you want to change a property.
Learn how to modify the properties of a clip by selecting options in the Interpret Footage dialog box in Premiere Pro.
You can modify the properties of a clip by selecting options in the Interpret Footage dialog box.
For more information about using the Frame Rate options, see Change the frame rate of a clip.
For more information about using the Field Order options, see Change the field order of a clip.
For more information about using the Alpha Channel options, see Alpha channels and mattes.
Andrew Devis has provided a video tutorial on Interpreting Footage on the Creative COW website.
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