Finished product looks grainy, but havent changed settings

Hey, so I only actually finish a product once every few months and always seem to have trouble at the end, getting it to the right look on the final product. I can't remember what I did different, but this project i'm trying to turn into a watchable video seems way grainer than my last vid. I haven't changed settings but it just looks like crap. When I preview it in animate it looks smooth and great but for some reason whenever i export video/media then run it through media encoader it looks like crap.   What am I doing wrong here?