Video texture not showing in AVI movie

I’m doing an archvis fly through with video screens playing on the walls. The screens aren’t showing up when I output the AVI in matinee. however when I press “play” and preview the fly through they work fine.
I’ve made a “movies” folder in the content folder of my project and paced the mp4 file in there. It’s still not working.
Any suggestions would be great as I have to show this to a client tomorrow.