Can't apply filter shader with a non preloaded filestream

Hello All !
I have an issue with level shader and a filstream.

My patch loads a movie by random and send it to a level shader…
but there’s a weird issue;
the movie doens’t appear correctly (see image)
it’s solved when I plug filestream directly into the quand and then plug it back to level…Which I could’t do in real time…

any clues,
here’s my simple patch…

essai-contrast.v4p (9.1 kB)

yes !!
thanks !