Luckily for me--though not necessarily for you, dear readers--I found one. It not only lets me re-orient the video, it also let me combine the four short into one longer montage. And with no editing, the transitions are even okay. Obviously, I need to play more, but I am okay with the output I got after a mere 15 minutes of work.
Now--barring any technical difficulties--you will all see why my horse is the best chiropractor I've ever had.