The video leaving Farglow is '...\Divinity II - DKS\data\Video\Story\ToBrokenValleyRide.wmv'.
Most of the video names are relatively easy to identify (at least if you've already played the game), like Start_Movie.wmv (cutscene with Damian on his flying fortress and then a slayer seeing a dragon knight) and Tutorial_Arrival.wmv (ladybug flying through Farglow). Videos for the FoV expansion start with 'EXP_', etc.
The link you gave, with the conversions, will probably work too
The links to the downsized videos are broken (the site was shut down).
