Apple Compressor 3 - Manual (Page 281)

• 24 @ 23.98: Use this setting when you have 24 fps video and want to convert it to
23.98 fps for NTSC DVD distribution.
With all these options, no intermediate video frames are required—the existing frames
are just set to play back faster or slower.
Entering a Duration
The duration field shows the clip’s current duration. As you change the duration, the
percentage value changes to reflect that change.
This option is most useful when you have a source media file whose duration is a bit
longer or shorter than it needs to be, and you’d rather change its playback speed than
add or remove video frames.
With this method, intermediate video frames are created as needed.
Forcing Frames to Play at the Encoder Pane’s Frame Rate Setting
This option is used when your source media file uses a frame rate different from the
Encoder pane’s Frame Rate setting.
281 Chapter 23 Working with Frame Controls