Duuuuuuuuuuude, Check your file size. Chris has a file size limit of 20M. Even if my files are under that, I still have trouble sometimes uploading vids. I have to try 3 or 4 times on some of them.
I think there is a 15 min time limit and a 20 MB size limit, not sure but i think that is what i heard. There was a post on here about it and i think that is what chris said.