I see from the extension page that
[[File:Video.ogv|File:Video.ogv]]
"Display a video at its nominal size. Displays a still image from the midpoint with a play button to start an embedded player."
My first question is, why does the file have to be specified twice? When I specify it just once, it seems to work just fine. So I'm not sure what I am missing.
But my real question is, "Is there ay way to override the the default behavior of displaying a still image from the midpoint of the video?" I have uploaded a hero / poster image from the video as an image file. But I can't see any syntax that let's me specify it as the image to use.
Is this possible?