There were four versions of Innocence of Muslims, all with different names, but I assume you’re talking about an entirely different video. It would be great to know what it was and try to find the source of it.
There is evidence that the someone in the FedMob had a hand in producing and/or disseminating Innocence of Muslims.
I’m pretty sure it was mentioned before Benghazi took place on the day of the Cairo riot. For a while there the press wasn’t sure what youtube video the embassy was talking about.