Preparing the Clips for Editing

Cinema Tools includes two features you can use to help prepare the captured clips for editing.

Reverse Telecine

The Reverse Telecine feature (for NTSC transfers only) provides a means of removing the extra fields added during the 3:2 pull-down process of the telecine transfer. You need to do this when you intend to edit the video at 23.98 fps. See Frame Rate Basics for information about what a 3:2 pull-down is and why you might want to reverse it. See Reversing the Telecine Pull-Down for details about using the Reverse Telecine feature.

Note: The Reverse Telecine feature cannot be used with temporally compressed video such as MPEG-2-format video.

Conform

The Conform feature is useful both to correct errors in video clips and to change the frame rate (timebase) of a clip. Cinema Tools lets you select the frame rate you want to conform a clip to.

In order to understand the Conform feature, you need to know a bit about the nature of QuickTime video files. Each video frame within a QuickTime file has a duration setting that defines the length of time that a particular frame is displayed (normal NTSC- or PAL-based QuickTime video has the same duration assigned to all frames). For example, the NTSC video rate has a value of 1/30 of a second (actually 1/29.97 of a second) assigned to each frame. The PAL video rate is 1/25 of a second.

Occasionally, captured video clips have some frames whose durations are set to slightly different values. Although the differences are not visible when playing the clip, they can cause problems when Cinema Tools creates the cut list or when you use the Reverse Telecine feature. In these cases, you can conform the clip to its current frame rate.

There are also times when you may want to change the frame rate of a clip. If you transferred 24 fps film to video by speeding it up (either to 29.97 fps for NTSC or to 25 fps for PAL—in each case ensuring a one-to-one relationship between the film and video frames), the action during playback will be faster than in the original film, and the audio will need to have its playback speed adjusted to compensate. You can use the Conform feature to change the clip’s frame rate to 24 fps, making it play back at the original film rate and stay in sync with the audio. See Using the Conform Feature for details.

Note: Make sure to use the Conform feature on a clip before editing it in Final Cut Pro. Also make sure the editing timebase in the Final Cut Pro Sequence Preset Editor is set at the same rate you are conforming to.

See Determining How to Prepare Source Clips for Editing for more information.