This is Part 46: "Memoria Entrance" of the Excalibur II speed run in Final Fantasy IX (US), which was completely done in only 7 hours, 6 Minutes and 21 Seconds. That is even faster than the run from FUMIZO from www.ultimagarden.net, whose record was 07:28:43.

For detailed descriptions and a complete walkthrough visit http://www.rpgsquare.de/index.php?g=1522 (less info)