David I found cycling.tv to be a load of old rubbish. Unreliable, often jerky, and when it shows something you want to see it's often only for the US or on a different channel which you have to subscribe too in addition.
Try [url]http://www.cyclingfans.com[/url], I always go there and they normally have a link to a stream (often foreign commentary but if it's an Italian one in the Giro you'll be okay
). Generally pretty reliable and sometimes a choice of 2 streams so you can pick the one that works best on your machine.