Not sure this'll be of any help, but I wanted to capture & stream another STB across my network. I looked high & low for a device that could do what I wanted, sadly they're all far too expensive or required Windows. I eventually found the HS602-T device that's branded under a number of different brand names (often at stupidly expensive prices). Here in the UK it's branded as the "'Maplin Game Capture Pro HD' sold by Maplin"
I did a bit of research on the box & it appeared do everything I needed but like all the rest it apparently needed Windows & only streamed in 720p.. I bought one anyway, but couldn't get the software to install on Windows, so sent it back and looked for more. But the damn thing kept coming up time & time again.
I then stumbled upon "this thread on
xda-developers" which as you can see explains that the box has an open telnet port! So purchased another from ebay & began messing with it & eventually figured out how to stream over the network!