[cskiwi]

Hello, I need some help with Sony Vegas Movie Studio Platinum 9.0

Some friends and me wanted to make a video in the game called Battlfield heroes, and we all used our programme to film what we see,

then they all send it to me, i made a video of that
so far so good,

but then i wanted to render it, and it doesn't add any kind of films exept the *.wmv 1 person filmed with output vid: wmv and the extension was wmv, and those vid he can render

how is this possible?
here is the video on youtube what I render:
YouTube - BFH movie

Srry for my bad eng I'm Dutch speaking