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27th February 2006, 03:58 | #1 | Link |
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Join Date: Jan 2006
Posts: 1,867
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New Technique: Component4All!!
Yet another ground-breaking cap technique: now anyone can capture pure component video with no special equipment! Forget expensive pro-level cards, you don't need 'em!
Updated 03-2006: This technique increases your potential resolution by about 2x beyond what you could do with lossless HuffyUV. So the real resolution is 1440x480, yes that's high-def! To keep this amazing resolution you will have to save in hi-def, otherwise, you will lose - for example saving as Huffyuv will use YUY2 color format - this means 2 pixels of color are stored as one. Caveats: - your source must be 4:4:4 ** UPDATE: this technique always improves quality, because svideo has inherently low color resolution, even if your source was only YUY2 orignally. You can get all the 4:4:4 quality as well if the source uses real chroma or 4:4:4 chroma upsampling. - you will have to cap 3 times in a row, in a repeatable way - it's slow - the cheap and fast version, has slightly wrong colors - you have to really want some hi-def glory... Ok, now here's how: you need a "Y" splitter cable, two females to one male, type cinch/RCA/phono. You need an svideo to composite connector, or just a composite connector on your cap-card. DISCLAIMER: This technique requires you to make non-standard connections. The risk is your own. Connect Y directly to your composite in. Cap. Connect Y and Pb together, send to your composite in. Cap. Connect Y and Pr together. Cap. Make 3 files: y.avs, ypb.avs, ypr.avs. Put your mpeg2source and trim commands in here, so that all files start playing from the same frame. Final step: run this script. Code:
y=avisource("C:\MyVideos\y.avs") ypb=avisource("C:\MyVideos\ypb.avs") ypr=avisource("C:\MyVideos\ypr.avs") vyu=mergergb(ypr,y,ypb) return(vyu) Results: -The grey range, and flesh colors are excellent. Some rare colors are shifted, but you cannot notice this. In theory it's "wrong", but it works. -The color fringes around strong colors are gone! (something I find very annoying about s-video). -If you dropped any frames in any caps, you will start to see some ugly color ghosting. - UPDATE: I now have a script which exactly recreates the RGB picture, colorbar test patterns are accurate. However this requires some careful, one-time calibration. I'm working on the calibration proceedure. - UPDATE: I have test results which prove >=1.6 color resolution as measured from a DVD Video Essentials test DVD pattern - chroma frequency sweep. I have many more ideas brewing - stay tuned. (>2 times further resolution is possible...) Last edited by jmac698; 7th March 2006 at 22:19. Reason: disclaimer |
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