Apple Cinema Tools 4 - Manual (Page 34)

In the above illustration, the blue NTSC fields represent fields that are removed during
the reverse telecine process on a clip using traditional 3:2 pull-down. (See
Adding and
Removing Pull-Down in 24p Clips for information about 2:3:3:2 pull-down.) The window
burn NTSC timecode will be different from what Final Cut Pro shows for all frames except
the first one of each second, regardless of the clip’s length.
What Happens to the Timecode After Using Conform?
There are three common situations you would use the Conform feature for:
• Converting PAL 25 fps video to 24 fps: The timecode is not changed, which ensures that
an EDL exported after the clips are edited will accurately refer to the original PAL
timecode. The drawback is that the timecode, at 25 fps, no longer accurately represents
the true passage of time when played at 24 fps because each frame is displayed for a
slightly longer time. See
Working with 25 fps Video Conformed to 24 fps for more
information.
• Conforming 29.97 fps video to 29.97 fps: The timecode is not changed. This process is
used to correct issues in a QuickTime file prior to using the Reverse Telecine feature.
See
Solutions to Common Problems for more information.
• Converting NTSC 29.97 fps video to 23.98 fps: The timecode is altered, with a number
skipped every five frames. This conform situation is rarely used.
See Using the Conform Feature for more information.
Audio Considerations
Because the audio for a film is recorded separately on a sound recorder, there are a
number of issues that you must be aware of and plan for:
• What type of sound recorder to use: For more information, see Choosing a Sound
Recorder .
• What timecode format to use: For more information, see Choosing an Audio Timecode
Format .
• How to mix the final audio: For more information, see Mixing the Final Audio .
• How to synchronize the audio with the video: For more information, see Synchronizing
the Audio with the Video .
Choosing a Sound Recorder
When choosing a sound recorder, you have several options: an analog tape recorder
(typically a Nagra), a Digital Audio Tape (DAT) recorder, or a digital disc recorder. Whether
analog or digital, make sure the recorder has timecode capability.
34 Chapter 2 Before You Begin Your Film Project