its not absurd but it makes people like me simply not doing it. I am not posting because i think the idea of aharing information this way it wrong. I am just statign that you will miss a huge percentage of interested users this way (like me).

I see it this way: Its like having to show your personal id or passport at the backery arround the corner, just to see what kind of bread they are selling (and please dont tell me know you would do so )

And comparing a library archiv like gamasutra and kind (that offer newest stuff without registration in the first week anyway....maybe a reason ) and a product website of a game doesnt work for me. You are neither an information database or library.
Tv commercials and stuff are first not free (where i live i have to pay for my tv every month) and anonymous. Your login procedure is customer database filling and therefor anything else then anonym.

Maybe you offer two version of the clip now?
A small test preview and a large one that requires a login. Then people might be interested (but still a huge ammount wont download it...but i guess better then nothing )