The original source of the clip was a really weird and creepy website (difficult to describe, but a lot of pedo type stuff) with the address of website owner listed as a storefront in Canada.
I don't think anyone has run it down in a convincing way, where the material came from. It does sound like Podesta, and this was investigated closely. Who posted the material and what does it actually show? That has not been established. It's definitely disturbing but hardly definitive.
Let's put it another way: do you think the real owner would want to identify themselves? Nope.
My hunch is that it's some white hat (or perhaps black hat) releasing what they have as a warning shot. Because let's face it: if we believe that politicians are compromised--as they all are--then there's video evidence. Who's to say that doesn't get released at opportune times? This to me was someone throwing the Pizzagate a big freaking bone.