I am watching on a decent monitor, I am also aware of aliasing effects due to shutter speed. I also pay attention to which way the wheel starts to turn when placed on the belt, which is why I think the treadmill is running backwards, but again because of aliasing effects, that also may not be correct.Oogah Boogah, a though occurred to me. You said you could not tell which way the treadmill was going. Are you watching the videos at full screen on a decent monitor? I keep forgetting that there are so many small handheld devices out there today you might not appreciate how clear some of these videos are in high definition and full screen.
And again, just because you say so and you have a video, that is not enough. But it does make an interesting topic, which is off topic for this thread. Thanks for the heads up on the discussion, but I won't be discussing it further here.