Looking to buy a Ki Pro Quad, however, will still be at SD-SDI for a little while longer. Since the Quad does not support SD input, what happens if you plug SD-SDI in and configure for 720p? Does the picture just fall in the middle of the frame, with letterbox and pillarbox space all around?
The Ki Pro Quad accepts a wide variety of formats and frame rates, however standard definition video is not supported. For a complete list of formats and frame rates that are supported, please review the "Video Formats" section of the "Tech Specs" found on the AJA website: http://www.aja.com/en/products/ki-pro-quad#techspecs
If you want to continue working with SD video sources, you could consider using the AJA Ki Pro Quad in combination with an AJA UDC Up/Down/Cross Converter Mini-Converter. You may learn more about the UDC Mini-Converter here: http://www.aja.com/en/products/mini-converters/udc
If you have any additional technical questions, please feel free to contact the AJA Technical Support department directly via phone or email between 9am and 5pm PST. They will be happy to answer any questions you might have: http://www.aja.com/en/support/contact
AJA Video Systems
+1 (530) 274-2048 Intl.
(800) 251-4224 US