Originally Posted by
Mozella
There is no way for me to verify the video; i.e. who knows when and where it was taken.
Surely not an official verification but on the Internet if a given picture or video was posted before, someone will be able to show where and when.
So, if can't be shown that the video was already "known", either it has been quickly and skillfully fabricated, or someone had the good luck of possessing an unrelated but very fitting video to share at the very best time. Both things are possible, but how much likely?
Then regarding the question about why someone would have been out in the cold early hours with a smartphone ready to film, I think it's very possible that many in Tehran got to know of the Iranian launches, or even if they didn't, they went out to document any possible development, even if that could have been the last thing they did in their life. And they filmed, survived, and shared, we should be thankful.