Ok, so you can now do:
```
y = ref(0)
def ty () =
y := !y-1;
if !y <= -100 then y := 0 end;
!y
end
s = single("test.avi")
s = video.add_text(x=0, y=ty, speed=0, size=40, "Hello world!", s)
s = mksafe(s)
output.sdl(s)
```
which allows you to program whatever function for `x` and `y`. For the text it
was already the case, you can use a similar logic with references to update it!
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