i am thinking about getting a capture card for my xbox 360, however, i play in hd, so the hdmi cable runs from the xbox to the tv, and to use my turtle beach, i have an optical audio adapter, with red and white piggyback rca jacks, seeing as both of the SD video and HD video slots are used on the xbox, will i be able to set up capture card.

might be worth noting that the red, white and yellow standard definition slots on my tv are available.