It works when you use it in a separate window. But when you want to have the video rendered inside a widget in your app (between seekbar and controls in Knots), you have to use the xvimagesink and pass the x window id of your widget to it. But for some reason I'm only getting first frame and audio with dsp error messages so I'm starting to believe it's the same error that people get when they try to stream content over upnp (which uses http too).

But I'm no expert so I can't back that up with paperwork, but I think I'll wait for pr1.2 before wasting anymore time with it.