[AlexDanger]

Its not clear to me from the walk-through how they ensured they were only counting each bottle once? Is that something they automated or is it left as an exercise for the reader?

How would you go about automating the unique count when you are sampling the video 3 times a second?

[umvi]

No, it just gives you bounding boxes. You still need to manually go frame by frame and count all unique boxes.