No. Not in the US, anyway. But posting
to YouTube could be, if you don't hold the copyright for the material and aren't using it in a way covered by the Fair Use clause.
As I said earlier, US copyright law (and copyright law in general) doesn't care about the people receiving
the copies, just the people making and distributing them. As long as you're not using a technology that shares content as you download or steam it (streaming being the safer option, but only because judges and politicians don't understand that there's little technical difference between the two), you can watch whatever you want and not violate copyright. It's only if you then share that with someone else that you cross the line legally.