[mythtv-users] OT: How is this inline done?

[Jerome Yuzyk]

I don't even know how to ask a good Google question for this, and there appear to be some broadcast veterans/nerds here, and it's quiet, so I ask.

I understand how green-screen works, but there is a new form of inline static advertising overlay (or insertion) that I can't understand using green-screen. Up here in Canada we get to see ads for Canadian Tire in the SuperBowl or MLB (baseball) games, for example.

It's on the glass behind the goalie nets in NHL games. I first noticed Fox-LA doing this a couple years ago in Kings games and now it's come to my hometown. 

What I can't figure out is what are the overlay/insert "hooks" that one can do with glass panels and stanchions?  Is there something embedded in the glass? The four corners of the ads are on glass, so it's not something the stanchions are doing. As for MLB, ads aren't seen in replays, so the ads have to be on a separate stream merged into the live feed.

-- 
A little of Jerome's MythTV World: http://mythtv.bss.ab.ca
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