problem about demo

[bigteeth43]

first question:
when i run the code by own interface，and i click the step2 it shows error
second question:
when i run the code by own interface，i use the video in your demo, the result is different from mine

[bigteeth43]

txt.npz and vid.npz is the answer? do i change them?they are download in the project,i don't touch them but i can't get the correct result as your truely interface.