> And what is the complete correct syntax for applying the script in real time ?
hmmm
I tried to follow this post without success:
https://forum.doom9.org/showthread.php?t=173535
import vapoursynth as vs
core = vs.get_core(threads=7)
clip = core.std.FlipVertical(video_in)
clip.set_output()
if you don't know how to modify the sample script then probably you don't need this at all