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)
422
Part V
Appendixes