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| Vigile |
| Posted: Mar 9 2013, 12:33 AM |
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Newbie
Group: Members
Posts: 1
Member No.: 36229
Joined: 9-March 13
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I am using Vdub to record data from a dual-link DVI capture card, the Datapath DL-DVI. I am trying to capture 1920x1080 @ 120 Hz but the BW is the limit on the card. I don't need perfect reproduction and I think doing an 8-bit video quality capture would be fine, and I have heard that Vdub will support it.
Any idea how to try to do that? |
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| phaeron |
| Posted: Mar 9 2013, 07:26 PM |
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Virtualdub Developer
Group: Administrator
Posts: 7773
Member No.: 61
Joined: 30-July 02
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Ouch, I've bought entire computers that cost less than this capture card.
I'm pretty sure that the distinction between an 8-bit and a 24/32-bit video mode is gone by the time the video card is producing DVI output -- the video card would have already expanded the 8-bit display. VirtualDub will capture 8-bit (256 color) output, but only if the capture hardware itself can produce that format. From what I can tell, DVI only supports RGB, which means it could not possibly produce classical indexed color output at 8 bits/pixel.
What's more confusing is that 8-bit can also mean 8 bits per channel, as in 8 bits/channel * 3 channels (RGB) = 24 bits/pixel. That you are already likely capturing by default.
One way to reduce bandwidth would be to get the computer to output 4:2:2 YCbCr instead of 24-bit RGB, but it looks like this is only possible with HDMI and not DVI.
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