Adobe PREMIERE 5 User Manual page 169

The actual frame rate of a clip during playback or export depends on a complex relationship
between the source clip frame rate, the project timebase, the frame rate you specified for
playback or exporting, and any modifications you make using the procedures in this section.
Changing the frame rate may cause some frames to be omitted, created, or repeated. See
"Understanding frame rates in relation to the timebase" on page 336. If you want to change
the frame rate for the entire Timeline, do not use any procedures in this section; instead see
"Video settings" on page 61 and "About output settings" on page 297.
To change frame rate of a source clip in order to change the speed of action:
Select a clip in a Project, Library, or Bin window, or in the Timeline.
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2 Choose File > Interpret Footage.
Select Assume This Frame Rate, type a value in frames per second, and click OK. Premiere
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redistributes all of the source clip's frames to create the new speed. If there are Timeline
instances and subclips based on the clip, their frame rates and durations also change.
To change the frame rate of a clip in the Timeline without changing the speed of action:
1 Select a clip in the Timeline, and choose Clip > Video > Frame Hold.
In the Clip Frame Rate section, select Alternate Rate and type a new frame rate.
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Select Frame Blending if desired, and click OK.
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