Thanks for the help, John T. Smith and Jim Simon.
It turned out to be the issue with the project sequence not being set to the correct specifications. I'm not sure what exactly was incongruent between the two, but I just did that thing where I drag the video onto the "New Item" button and it corrected itself.
Sorry for the late response - it took me awhile to wade through the information, as most of it was completely alien to me. I still have to go through a lot more of it. The help is greatly appreciated.