When I render the video it is all grainy( not a nice clear video). When I watch the video in the preview window it is good, not grainy at all. But when rendered/recorded the video is grainy.

I select Make Movie then Burn to DVD or Blue Ray then DVD with menus ( I have also tried without menus). Always comes out grainy.

What would be the cause of this ?

I am using Movie Studio 14.0 Platinum. I am using windows 7.

I have never had this problem in the past, it just started yesterday. In preferences I set everything back the default settings. With no luck.