Apple Final Cut Pro 7 - Manual (Page 1608)

A dissolve from a Final Cut Pro sequence is shown below in EDL format.
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Transition Duration
The duration of a transition (in frames) follows the transition type. For example, D 024
indicates a 24-frame dissolve.
Source In and Out, Record In and Out
In each line of an EDL, the first pair of timecode numbers are the source In and Out points.
The second pair are the record In and Out points, which correspond to the clip’s location
in the Timeline.
Edits that use transitions such as dissolves or wipes require two lines. The first line
represents the source before the transition, and the second line is the source after the
transition.
On tape-to-tape editing systems, the tapes containing the two shots are loaded in two
video decks—VTR A and VTR B. To perform a dissolve or wipe, the edit controller plays
both decks simultaneously and uses a hardware video switcher to create the transition
effect as it’s recording on the final master tape. However, when both shots in a dissolve,
wipe, or key are on the same reel, it is impossible to perform the effect in a tape-based
editing suite. This is because the tape cannot be in both places at the same time. For a
workaround to this problem, see
“Settings and Options in the EDL Import Dialog.”
1608 Chapter 96 Importing and Exporting EDLs