Have you already tried disabling in the capture device instead? I didn't know it was possible, but Matrix claims their MX02 has the option.
(tip via Jarvis @ DigitalFAQ)
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| D-VHS or S-VHS units with switchable AGC? https://forum.lddb.com/viewtopic.php?f=18&t=2235 |
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| Author: | acuozzo [ 15 Jan 2013, 19:06 ] |
| Post subject: | D-VHS or S-VHS units with switchable AGC? |
I have in my possession a 2nd generation Star Wars bootleg VHS from either 1977 or 1978. You can read more about it here: http://originaltrilogy.com/forum/topic. ... Post582266 It appears to be very sensitive to AGC circuitry, so dark->bright scene changes appear blown-out and bright->dark scene changes appear crushed (a.k.a., too dark). I can't disable the AGC in my Panasonic AG-1980P, so I have no way of knowing if the blown-out/crushed scenes represent the signal stored on the VHS. I have a hunch that they don't because multiple captures of the VHS show the same blown-out/crushed scenes differently. Are there any D-VHS or S-VHS units that allow you to disable the AGC? |
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| Author: | msgohan [ 17 Jan 2013, 11:40 ] |
| Post subject: | Re: D-VHS or S-VHS units with switchable AGC? |
My understanding of consumer video is that the AGC is a necessary part of the process. |
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| Author: | acuozzo [ 17 Jan 2013, 17:42 ] |
| Post subject: | Re: D-VHS or S-VHS units with switchable AGC? |
msgohan wrote: My understanding of consumer video is that the AGC is a necessary part of the process. Well, it's certainly necessary to implement Macrovision. With that being said, most pre-Macrovision VCRs came without AGC circuitry. |
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| Author: | disclord [ 17 Jan 2013, 19:01 ] |
| Post subject: | Re: D-VHS or S-VHS units with switchable AGC? |
acuozzo wrote: msgohan wrote: My understanding of consumer video is that the AGC is a necessary part of the process. Well, it's certainly necessary to implement Macrovision. With that being said, most pre-Macrovision VCRs came without AGC circuitry. Betamax was immune to Macrovision as were a few RCA decks, but most pre-Macrovision VCR's were affected by it - that's why it was developed the way it was, because all VCR's had AGC that would respond to it. Colorstripe Macrovision affected Betamax too but not all that bad - I can make dubs from DVD to my Betamax decks and end up with a nice copy with a few colored lines, almost like LaserDisc dropouts in the image. Not so with VHS - my 1981 VHS deck, which predates Macrovision by many years (The Cotton Club was the first Macrovision tape release), goes crazy when trying to dub a protected DVD or tape. Mitsubishi TV's were also affected by Macrovision and most studios would supply non-Macrovision tapes to buyers who owned those model TV's. Macrovision actually backed off the level of their signal on tapes to increase TV compatability. |
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| Author: | msgohan [ 20 Mar 2013, 16:15 ] |
| Post subject: | Re: D-VHS or S-VHS units with switchable AGC? |
Have you already tried disabling in the capture device instead? I didn't know it was possible, but Matrix claims their MX02 has the option. (tip via Jarvis @ DigitalFAQ) |
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| Author: | acuozzo [ 20 Mar 2013, 17:04 ] |
| Post subject: | Re: D-VHS or S-VHS units with switchable AGC? |
msgohan: Thanks for the tip, but that's unfortunately way way out of my price-range. |
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| Author: | msgohan [ 20 Mar 2013, 20:25 ] |
| Post subject: | Re: D-VHS or S-VHS units with switchable AGC? |
http://www.bhphotovideo.com/c/product/6 ... ptops.html Buy for 400 resell for 20% off? I would buy it from you. 
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| Author: | msgohan [ 09 May 2013, 07:53 ] |
| Post subject: | Re: D-VHS or S-VHS units with switchable AGC? |
According to its manual, the Matrox RT.X2 card from 2006 allows the same feature. It's a full-length PCIe card so it will be annoying and possibly impossible to install in some cases, though. Attachment: 1307519822_214031092_4-Matrox-RTX2-LE-Services.jpg [ 40.88 KiB | Viewed 4620 times ] Looks like it originally sold for $1100. eBay completed listings show a range of $115 to $300. I was outbid today on one that ended at $162.50. Not actually in the market at the moment since I don't have a PCIe machine here. |
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