Apple Cinema Tools 4 - Manual (Page 129)

Tips for Using Reverse Telecine
Following are some tips for using reverse telecine:
• Reverse telecine works best if the captured video does not have any dropped frames.
If you attempt to use the Reverse Telecine feature on a clip that has dropped frames,
a warning appears. See
Avoiding Dropped Frames for more information.
• If you have to reverse the pull-down for several clips, you might want to use the Batch
Reverse Telecine feature instead, because it allows several clips to be processed at
once. See
Using Batch Reverse Telecine for more information.
• Reversing the 3:2 pull-down with software is a time-consuming process; you’ll need
to allow waiting time while your computer does its work. Hardware reverse telecine,
performed by a third-party capture card while the video is captured into your
computer, is a speedier option.
Determining the Field Capture Information
You need to enter field capture information in the Reverse Telecine dialog. Typically, all
of your clips are generated with the same hardware and settings, so you only need to
look at a few frames of one clip to determine the field capture mode. A clip can be
captured as one field or both fields, with field 1 or field 2 dominance.
Look at the key number and timecode window burn on the video frames to determine
the frame sequence and verify whether the video has one or two fields. The key number
window burn usually includes the A, B, C, and D frame type indicators. (Also, the timecode
often has the number “1” at the end to indicate field 1, and “2” to indicate field 2.) In the
Clip window, use the arrow keys on your keyboard to step through a few frames of a clip
and observe the sequence of film frame numbers. Refer to the table below to find out
your field information.
In the Reverse Telecine dialog,
select as capture mode
Then your video contains
If the repeating frame
sequence is
Field 1 - Field 2 Both fields, with field 1
dominance AA, BB, BC, CD, DD or A1A2,
B1B2, B3C1, C2D1, D2D3
Field 2 - Field 1 Both fields, with field 2
dominance AB, BB, CC, DD, DA, or A2B1,
B2B3, C1C2, D1D2, D3A1
Field 1 Only One field, with field 1 dominance A, B, B, C, D or A1, B1, B3, C2, D1
Field 2 Only One field, with field 2 dominance A, B, C, D, D or A2, B2, C1, D1, D3
129 Chapter 8 Preparing the Source Clips for Editing