Hi again,

I looking for a method to leave transparent the things that are not moving in a video.

I have used gridflow's [#motion_detection] and the result is ok, but it doesnt leave transparent the part unmoving.

I know i can try modifyig [#motion_detection] to get what i want, but first i want to ask if your know other options.

br.
GARFF

[pix_background] in gem does what you seem to need. Tell it to sample a frame and use that to determine what is moving.

yes, i have just tried [pix_background] but the motion detection is not as good as with [#motion_detection].