Apple M8728Z/A User Manual - Page 129
Determining the Field Capture Information, Avoiding Dropped Frames, Using Batch Reverse Telecine
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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. If the repeating frame sequence is Then your video contains In the Reverse Telecine dialog, select as capture mode AA, BB, BC, CD, DD or A1A2, B1B2, B3C1, C2D1, D2D3 Both fields, with field 1 dominance Field 1 - Field 2 AB, BB, CC, DD, DA, or A2B1, B2B3, C1C2, D1D2, D3A1 Both fields, with field 2 dominance Field 2 - Field 1 A, B, B, C, D or A1, B1, B3, C2, D1 One field, with field 1 dominance Field 1 Only A, B, C, D, D or A2, B2, C1, D1, D3 One field, with field 2 dominance Field 2 Only Chapter 8 Preparing the Source Clips for Editing 129