I play games on my rig and I want to record with a capture card on my Mac. This is because programs on PC lower the performance of the game, but the main reason is that you have to be recording all the time or else you might miss something. My capture card let's me rewind and save clips so I don't have that problem.
Anyway, I have the video go from my rig to my monitor via DVI @ 1920x1080p
I also have the image go to the capture card via HDMI at the same resolution. The video is great and works just how I like. The problem is with the sound.
I need the sound to go to my headphones (USB Surround Sound Headphones), AND to my capture card (over HDMI). Windows 7 will only let me choose one or the other. When I select the capture card in the playback sound menu in the control panel, the sound goes to the Mac/Capture Card properly. When I select the headphones, it goes to the headphones properly. The problem is that I need both.
I tried this that some guy on the Microsoft forum wrote, and people on YouTube in my situation have used successfully:
Open Sound panel
Select Speakers as the default playback device
Go to the "Recording" tab
Right click and enable "Show Disabled Devices"
A recording device called "Wave Out Mix", "Mono Mix" or "Stereo Mix" (this was my case) should appear
Right click on the new device and click "Enable"
Right click on the new device and click "Set as Default Device"
Double click on the new device to open the Properties window
Go to the "Listen" tab
Click on the "Listen to this device" checkbox
Select your HDMI device from the "Playback through this device" list
When I do that, I get sound on my headphones, but no sound on the Mac/Capture Card, but strangely, Windows error "sound effects" dings/dongs, beeps etc. will still play on the capture card, just not the rest of the audio. It seems to be a larger problem with the "Listen to this device" / Stereo Mix not working in general, I have tried reinstalling my audio drives, they are Realtek drivers, my motherboard is a Gigabyte GA-Z77-HD3P.
I have been trying for 2 days to fix this. In summary, I need my audio to go to my USB headphones and over HDMI to the capture card at the same time, the same audio, a feature which Windows 7, does not support officially. There has to be a way, it's simple enough.
The only thing i can think of is getting a splitter, but it probably will only do analogue and not digital. Have you tried using an audio only recording software like Audacity, then sync it later when you are editing it?