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| jmac698 |
| Posted: Oct 4 2011, 07:27 AM |
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Member
Group: Members
Posts: 11
Member No.: 29274
Joined: 7-December 10
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Hi,
Could you make a small extension to the capture settings to support 720x504 or so resolutions, so I can extract the VBI info from lasersdiscs, intercast data, etc.
Someone made a program for this but it's not released, screenshot showing lines 11-21 here:
http://aarongiles.com/?p=238
Most tv cards are off-center and shifted down just to avoid seeing the flickering CC data on line 21/23, so this would solve that problem too. There's also some old VHS tapes with extra video lines. There's LTC and all sorts of uses.
From what I gather you just need to read the VBI pin.
VBI Scope with source
http://www.nomadelectronics.com/Vidcap/Dir...e/VBIScope.aspx
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| phaeron |
| Posted: Oct 12 2011, 05:22 AM |
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Virtualdub Developer
Group: Administrator
Posts: 7773
Member No.: 61
Joined: 30-July 02
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Sorry, but I think I'll have to decline. In order to do this I'd have to add an entire path to capture the VBI stream in the DirectShow capture module and tack it onto the beginning of each frame with a modified frame description, which is a lot of work for this feature. I'm not even sure I have a device that supports capturing VBI data.
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| jmac698 |
| Posted: Oct 26 2011, 11:41 PM |
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Member
Group: Members
Posts: 11
Member No.: 29274
Joined: 7-December 10
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Ok, how about simply capturing the CC text? In graphedit it's vbi pin to vbi data slice to cc demux or some such. Very few programs support it, wintv is one of them.
Anyhow I found that simply dumping the vbi pin output to a file is all I need; if I just read it as a raw image it's 1700x12 pixels. There's a call to a single function to tell you the width.
All WHQL cards have this feature; it was baked into the requirements IIRC from a partnership from Intel for their Intercast initiative; anyhow it's a requirement in US for all large TV's to require caption decoding, so it was probably a good idea for capture cards. Just open graphedit and find your capture card and look for the VBI pin. |
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