Hello,

I am trying to find a circuit or device that would allow me to mix baseband
video from my computer (Already has TV Out) with a 2nd video source.  I am
trying to do  Graphics On Screen Display (with existing video in
background), so Keyed Overlay support is needed.

I have found a few scan converters that take VGA and offer Keyed Overlay
onto a video source, but tend to be too expensive ($500 - $3000).

I am hoping to find a simple circuit I can build (good at building, bad at
designing), or even a cheap (<=$200) unit I could purchase, that would do
good quality keyed video mixing. (No need for broadcast quality).

Any help would be appreciated.

David.

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