Is it not possible to switch the uri in uridecodebin3?
I can answer my self now: first I have to change the state from
uridecodebin3 to READY, and then I can change the uri.
For me this feels strange that I have to set the state from the
whole bin to READY, that means for a moment the element stops
playing?! Does this not end up in very little breaks, every time
my script change the uri?