As far as I know Dtube is made on the Steemit platform and is linked to your Steemit account as well. Use either mp4 or webm as format when uploading. It's decentralized but having a lot of issues. Tbh, I don't think it will ever be able to outstand youtube (won't even come close). However it might be one of the best options you have right now (other than Youtube...).
My bet is that once EOS is finished, then we will see some proper decentralized version of Youtube, that can actually take the challenge of overthrowing it...