Does 2.5.3 have the ability to choose the first screen photo instead of a black box?

www.hearts-at-home.org/

Also, what is the best video format to use? I'm using .mov.

Thank you....anyone can respond, please.

I don't know about the best video format.
I work with a ****.flv video file placed on my server and I was able to show a start picture with a ****.jpg image with the same name than the .flv file and placed in the same directory.