Hi
Ive also just built a HTPC and am also a user of Hyperspin , looking at the forums on hyperspin there are almost 20 pages about this subject , hundreds of users in the same boat with this problem and it needs to be fixed !
I run a asus z97-deluxe (latest firmware) also tried it on a gigabyte h87m-d3h, intel i5 4670k, windows 64bit professional, 8gb crucial ballistic
All the mp4 videos are corrupt on it for some reason and its pointing to intel hd gpu on board as I use HDMI
Please please please sort this and you will make hundreds of people happy as they are having to buy additional graphics cards that do not have intel on them !!!