What font is best for full screen closed captions?

I'd like to upload some closed caption audiobooks to YouTube where the video is simply the subtitles for the text being read. [Here's an example].

What design would best suit this purpose?

I'm pretty set on a simple design: single font, plain background, etc.
In particular, what set of the following best suits my purpose?:

1. font face
2. background color
3. font size
4. margin size
5. font color