2:2:4 pull-down, 720p dvcprohd duplicate frames, Ab c d – Apple Final Cut Pro 6 User Manual
Page 1904: 720p dvcpro hd duplicate frames
Appendix C
Working with 24p Video
421
V
Despite its efficiencies, the advanced pull-down pattern is not as aesthetically pleasing
as 3:2 pull-down. If you plan to finish your project at 23.98 fps, advanced pull-down is
usually the best choice. However, if you plan to output your final 24p project to
29.97 fps interlaced video, you may want to add 3:2 pull-down because its pattern
is considered to be more visually appealing.
2:2:2:4 Pull-Down
This is an efficient but low-quality playback option used for previewing 23.98 fps
footage on an NTSC monitor. Few systems can reverse this kind of pull-down, so you
should never record footage with this kind of pull-down. This option is available for
situations when processing power is at a premium and your system is unable to
generate 2:3:2:3 pull-down or advanced pull-down during playback.
720p DVCPRO HD Duplicate Frames
720p DVCPRO HD camcorders can record 24 fps footage within a 60 fps signal by
duplicating frames. The duplicate frames are usually flagged within the DVCPRO HD
video signal so applications like Final Cut Pro can automatically remove them. You can
also remove duplicate frames using a frame rate converter (such as the DVCPRO HD
Frame Rate Converter in Final Cut Pro).
The duplicate frame pattern used in 720p24 footage is similar to the standard 3:2 NTSC
telecine pull-down pattern, but there is no interlacing because 720p video is
progressively scanned.
Note: 720p footage is almost always 23.98 fps, but true 24 fps recording is also possible
on particular camcorders.
A
B
A
C
D
C
D D D
A A B B C C D D D D A A B B C C D D D D A A B B
C D D D D A A B
C
B
D
C
D D D A
B
A
B C
D
C
D D
C
D
B
A
B
C
D
A A
B
B
C
C
D
D D
D
Field
1
D
Field
1
Field
2
Field
1
Field
2
Field
1
Field
2
Field
1
Field
2
Field
1
Field
2
One second
Before
(23.98 fps)
A
B
C
D A
D A
B
C
D A
B
C
D A
B
C
D
A B
C D
B
C
2:2:2:4 Pull-Down
After
(29.97 fps)