Answer 1

What's the link to the video?
What's your code?

When it says name not resolved, it sounds like the URL itself is incorrect and it's unable to resolve the DNS to the location you're providing. It's hard to really say with vague information and having no means to further investigate your issues. If you can post up the link to the video, and also post your code that's handling the URL, I'll be more than happy to help you out with it.