Video actually ends at the 25 minute mark, the last two minutes or so are blank.
YouTube Description:
Learn about samurai swordmaking in this video from the United Kingdom's National Museum of Arms and Armour, presented in conjunction with the Portland Art Museum's special exhibition "Samurai! Armor from the Ann and Gabriel Barbier-Mueller Collection," on view October 5, 2013 - January 12, 2014. All rights reserved.
(via LiveLeak)