need a capture card for Composite video

[bocce]

I want to stream my xbox gameplay in SD on a site like stickem or Jtv And play it in HD on my tv. can any one help

 

[bocce]

what im trying to do is play my xbox in HD via component cable and broadcast in SD via Jtv or ustream.tv.so I got is Hava unit http://www.myhava.com/product_hava_wireless_hd.html it does every thing I'm trying to do but streamlive/broadcast. so i called them up and they say they don't support it. I tried Blackmagic products too and i get the same answers.so any here would be great thanks