It seems that your live webcams are not working, well at least some of them.
Those live feeds are not ours, we are just "hosting" them via Youtube. But they are CONSTANTLY changing their live urls for some reason and we can't possibly keep up with them.
I don't know whay they keep doing that, maybe they do not want anyone else to host their feeds.
In any case i will be removing all those camera during the next week or so and i will try replace them with new ones (if i find some).
This is really sad and i hope you will find a technical solution for the problem before removing them.