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The first picture below is from the Luneau video (from Figure 1 in Cornell's paper).
The second picture below is from this page from Cornell's online Luneau video analysis.
Don Hendershot sent me an email noting that the "perched bird" in the Luneau video would have had to flash the interior of its wings as it left its perch, and the white of the perched bird in the first picture does roughly correspond to the interior of a Pileated's wing as it launches.
Jerome Jackson's January 2006 Auk article says that in his opinion, the "white shown extending from behind the tree is the large white patch present on the underside of the wing of a Pileated Woodpecker, held vertically, with the bird already in [full] flight."
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