the main problem with wanting this is that you want a computer with an hdmi in or somhow convert it to usb im not sure that s possible but i have seen a man that used an hdmi splitter and with the scart ps3 chords and some how with a desktop and dual moniters he was able to record with running one of the chords through a 70$ modem but if u could find some how a hdmi to usb that would be great but what ps3 shouldl have done was (if u dont need 1080 and would settle for 720) they should of made it so u can run out more than one cable option at a time like have an svideo running to a 30 easy cap card and play in hdmi to make it easier.... but there is a product by the name of "roxio" or something and it is 100$ and uses componant cables (a step down from hdmi but a step up from msvideo and componant)
well i hope i could help but based on what u want again like i said you would be looking for a very awkward device but again sony could have made it a little easier to record given the options that theyy had