This is the reverse of the question: "What format shall I post on the web so everybody can see my videos?"
There isn't any good answer for that one either. Most of us use a collection of different programs depending on what most of the work is. Some formats are almost impossible because the player resides on the server and not your local machine. Those are rough because you never actually get the video.
It could be said that some of the formats are intentionally difficult to keep you from stealing the work--not that you would be doing that.
No Rosetta Stone yet.
Koz