Exporting An Animation

Hi, so I'm new to animate and I need to export/publish an swf file and an mp4 file version of my animation. When I export my swf The export is bigger than the stage, which exposes some scribbles of colour etc when I actually want a clean line like the stage would give me if it exported as just the same dimentions as the stage.

I also have no idea how to publish as an mp4. 

Any help would be appreciated, thanks.