This is like asking "who made the first tower defense game" it's really really hard. Porn was way ahead of youtube though, historically porn always has been.
I'm not sure how modern parallels can be drawn, the porn industry is not as powerful nor large as it used to be, HDDVDs were just crap, Microsoft just wanted a foothold really, much like their equally as crap QR-code like thing that I only found out bout when an article told me it was dying. The formats that have won the "wars" have always been better, Betamax had A LOT of problems like duration for example.
That's off topic.
I doubt you'll ever find an answer but if you do, try and find the guys who actually made the porn flash players back in the days. I'm not sure if clicking "contact us" and sending such an email will work though....
I also have no doubt Apple were the first to patent, but as always they didn't invent it :P (This is a joke, people who get it will know what I mean)