Ok guys here is the deal. My current battlestations has a ps3 hooked up to my second monitor through a HDMI to DVI-D cable. To get audio I am using a USB dongle that routes the ps3 component audio into my PC so I can use my headphones for game audio while still getting windows audio. I am planning to get a PS4 but to my chagrin the ps4 does not have any componet out. How would I go about getting audio out of the HDMI out while still having video going to my monitor.
you would need whats called a HDM audio de-embedder. They are a high level, studio grade piece of equipment and you cant really get consumer ones. You won't find one for less than about $350. The cheapest ones also have bad signal distortion and things, so you'd really want a $500 one if you actually were going to get one.
As for a solution to your problem, the PS4 has a optical audio out. It needs a TOSLINK cable. You can run that into your computer if you have an optical audio in on your computer. If your computer doesnt have this, you might need a soundcard. (it will be listed as 'S/PDIF IN' on your motherboard/soundcard manual). For video, you can just keep using the HDMI to DVI thing you have going at the moment.
Hope that helped.
Also if you aren't sure, what motherboard do you have.