Apple M8728Z/A User Manual - Page 130
About A Frames, type. This letter is called
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What Is Field Dominance? The field dominance of a captured clip is determined by the telecine hardware and is usually not configurable by the user. Video frames are composed of two fields; one field consists of all the even lines of the video, and the other field consists of all the odd lines. At the telecine, the two fields are scanned at different times, which means that the film frame can advance between the time that the first field is scanned and the time that the second field is scanned. • When only one field is captured: Field 1 dominance means that only field 1 is captured, and field 2 dominance means that only field 2 is captured. • When both fields are captured: Field 1 dominance means that each captured frame is digitized from two video fields, but field 1 occurs earlier. Note: With field 1 dominance, the two video fields digitized into each captured frame should have the same timecode address, because SMPTE timecode is specified as beginning on field 1. Field 2 dominance, when both fields are captured, means that field 2 occurs earlier and that the captured frame contains video fields with two different timecode values. About A Frames If your video has window burn, the easiest way to locate an "A" frame is to look at the key number in the video frame, which typically has a letter after it indicating the frame type. This letter is called the frame type indicator. A frames include any frame with a frame type indicator that begins with "A," including an AA (also known as A1A2), AB (also known as A2B1), A1, or A2 frame. When you view the video a frame at a time, the frame type indicator for an A frame shows an "A" and the frame number is solid (not flickering between two frames). The frame type indicator in the window burn tells you this is an A frame. 130 Chapter 8 Preparing the Source Clips for Editing