Apple M8728Z/A User Manual - Page 31
@ 25 Method, Working with 24p Video, 25 Method, & 1 Method
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24 @ 25 Method Running the film at 25 fps sets up a one-to-one relationship between the film and video frames. The drawback is that the action in the film is sped up by 4 percent, and the audio will need an identical speed increase to maintain synchronization. To take advantage of the wide variety of 25 fps video equipment available, you can choose to edit with the action 4 percent faster. Another option is to use the Cinema Tools Conform feature to change the clip's timebase to 24 fps, correcting the speed. The video can then be edited with Final Cut Pro as long as the sequences using it have a 24 fps timebase. One second 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 24 fps 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1 25 fps First frame of next second Note: Final Cut Pro includes an Easy Setup and sequence preset with "24 @ 25" in their names, as well as a timecode format named "24 @ 25." These are all intended to be used with clips that originated as PAL 25 fps video but have been conformed to 24 fps video. See Working with 25 fps Video Conformed to 24 fps for more information. 24 & 1 Method Adding two extra video fields per second (also known as the 24 @ 25 pull-down method in Final Cut Pro) has the advantage of maintaining the original film speed, at the expense of losing the one-to-one film-to-video frame relationship. This method records an extra video field every twelfth film frame. One second 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 24 fps 1 1 2 2 34 34 5 5 6 6 78 78 9 10 11 12 12 13 14 15 16 17 18 19 20 21 22 23 24 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 24 25 fps Repeated field Repeated field Working with 24p Video With its frame rate and progressive scanning, 24p video is well suited for use with telecine transfers. It uses the same frame rate as film, providing a one-to-one relationship between the film and video frames without requiring a frame rate conversion. Chapter 2 Before You Begin Your Film Project 31