The Allwinner A20 and A10 chips have a 165Mhz 24-bit parallel video input interface. What that implies is that we can theoretically feed a full HD video stream to the IPU of the SoC, encode it to h.264 and livestream it.
Proto Rev 1.0
Proto Rev 2.0
A few months ago, I designed an HDMI imput shield for the Olimex-Lime development board which essentially converts the HDMI's TMDS to a 24-bit parallel feed. The board uses TI's TFP401 to do the conversion.
The schematics are available at my github:
The boards has a few minor mistakes so don't build this version just yet.
The software side is currently under development. I will release everything as soon as it is completed.