CHAPTER 4
162
Editing Video
Processing interlaced video fields
In some video sources, such as NTSC, PAL, or SECAM, each video frame consists of two
interlaced fields (see “Comparing interlaced and non-interlaced video” on page 341). One
field contains the odd-numbered lines in the frame, and the other field contains the even-
numbered lines. The two fields display in sequence to create a frame, but the field dominance,
or the field displayed first, can vary depending on the video format and the equipment used
to capture and play it. If the field sequence is reversed, motion may appear jerky or appear
to flicker. Fields can become reversed in the following situations:
• The field dominance of the original videotape was the opposite of the field dominance of
the video-capture card used to capture the clip.
• The field dominance of the original videotape was the opposite of the field dominance
of the video-editing or animation software that last rendered the clip.
• You have set an interlaced clip to play backwards in Premiere.
Premiere can process fields for an interlaced clip in the Timeline so that its picture and
motion quality is preserved in situations such as changing the clip speed, exporting a
filmstrip, playing a clip backwards, or freezing a video frame. The following settings operate
on individual clips; final results are affected by the project settings in the Keyframe and
Rendering Options (see the description of the Field Settings option in “Keyframe and
rendering options” on page 64 and “Exporting video files” on page 304).
To specify field processing options for a clip:
1 Select a clip in the Timeline.
2 Choose Clip > Video > Field Options.
3 Select Reverse Field Dominance if the field dominance of the selected clip is the opposite
of the field dominance used by your video-capture card. This option is also useful when the
clips in your project contains clips captured using different video-capture cards or when you
play a clip backwards.
c00.book for PS Page 162 Tuesday, March 31, 1998 1:28 PM
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