For both Gay and Spearmon, he used the HD NTSC video and Avid Liquid. He reminded me that I should’ve reported it as 10.08v and 10.61v since they are not true FAT (as defined by USATF) derivatives.
With segmented video, beginning with the gun flash, the software chronometer ran to the designated track markings. He was at the meet last year got a chance to plot out designated distances for certain events. I also know for a fact that he never uses the TV chronometer and utilizes the flash as much as can be attained.
With Liquid he’s able to triangulate (with some error of course) a given target position to offset conditions associated with parallax viewing. Though 3D, it doesn’t measure up to a fully compatible DLT process. It’s much closer to that with straightaway races - given known camera positions and so forth.
As I understand it he also used Kinovea and Eagle Eye, which has certain similar functions, for validation checking. If memory serves he used Dartfish for Bolt’s analysis.