Yes but It is NOT a live-stream ... it's a recording of a previous stream
And this site had no trouble downloading the previous recorded streams e.g.
URL http://www.twitch.tv/imperialdane/b/622199219
This previous recording works just fine with your website and I was able to download them
It seems after Feb 10th dated videos I can't get any more with your website :(
Thanks for looking into this :)