Classroom in a book

3
Change Speed to 50%, and click OK.
4
Play the clip in the Timeline. Render the clip by pressing Enter (Windows) or 
Return (Mac OS) to see smooth playback.
Notice the clip is now 12 seconds long. This is because you slowed the clip to 
50 percent, making it twice its original length.
5
Press Ctrl+Z (Windows) or Command+Z (Mac OS) to undo the speed change.
Sometimes you’ll want to change the speed of a clip without changing the 
duration. This is impossible without trimming the clip as it is slowed down. 
Adobe Premiere Pro provides a tool that makes this easy to do.

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ADOBE PREMIERE PRO CS5 CLASSROOM IN A BOOK
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6
Right-click (Windows) or Control-click (Mac OS) the clip, and choose 
Speed/Duration from the context menu.
7
Click the link icon, which indicates that Speed and Duration are linked, so that 
the icon shows the settings unlinked (shown here). Then change Speed to 50%. 
Notice that with Speed and Duration unlinked, the duration remains six seconds.
8
Click OK; then play the clip.
Notice that the clip plays at 50 percent speed, but the last six seconds have 
automatically been trimmed to keep the clip at its original duration.
Occasionally you will need to reverse time. You can do this in the same 
Clip Speed/Duration dialog.
9
Right-click (Windows) or Control-click (Mac OS) the clip, and choose 
Speed/Duration from the context menu.
10
Leave Speed at 50%, but this time also select the Reverse Speed option, and 
then click OK.
11
Play the clip. Notice it plays in reverse at 50 percent slow motion.
Speeding up a clip
Although slow motion is the most commonly used time change, speeding up clips 
is a useful effect as well.