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18th November 2020, 23:39 | #1 | Link |
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Brightness mess when capturing *some* VHS through Sony DCR-TRV33E
Hello everybody,
I've been lately playing around with VHS capture, nothing in professional terms but just an amateur distraction. As I recently learned VHS does degrade over time, I wanted to keep some tapes from my childhood like old Terrytoons cartoons and my beloved Star Wars trilogy. My equipment is pretty basic, but it works fine for my intentions, as I don't really want to restore or improve quality, just keep it as near to the source as it can: - Sony DCR-TRV33E paired with a PCI FireWire card as capturing device - Daewoo ST847S VCR (6 heads) I've succesfully transfered a couple of tapes. I 've used sclive, Adobe Premiere and now VDub2. But I'm having some trouble with the Return of the Jedi VHS: While it seems to capture properly, I've noticed that, in some specific parts of the movie, brightness goes up and down, concretely after scene changes. At first, I thought it was an anty-copy problem, but using a Macrovision box I have didn't change anything. Then I tried with another VCR, an LG C20P, with no change at all except for lower image quality overall. Not to say that the problem does not occur when displaying the VCR through a TV (brightness keeps stable, with any of the VCRs). The problem is already visible in the Handycam (I can see the brightness fluctuating in its LCD screen), so I guess it has nothing to do with the FireWire cable or card. As others have suggested, it seems to be some kind of brightness 'auto-adjust' that is causing the ups and downs, but it's confusing that it only happens in some movies. I've read threads of users with similar problems to no conclusion. Even read that people using superior devices such as SVHS with TBC can't get rid of the problem. Here is a portion of the capture that clearly shows the problem. It was captured with VDub2 and then encoded for uploading with the same program. Thank you in advance! Last edited by trotskito; 19th November 2020 at 13:58. |
19th November 2020, 10:22 | #3 | Link |
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Hi, manolito
That's what it looks to me also, but there's no autoexposure option in the camera's VCR mode. There's an option in camera (record) mode, but it has no effect on AV input-fed video. One user at digitalfaq suggested it could be indeed a Macrovision problem. It's weird because the tape is from 1995 and I'm almost sure I made some VHS copy of it back in the 2000s without this problem. BUT, Could it be that I'm using the Macrovision box not with its original scart cable, but with different RCA ones instead (in order to use the camcorder's RCA-to-minijack cable)?. I attach pictures of both. I have the original cable, but as it ends in another scart, I cannot use it in the camcorder, unless there's some kind of female scart-to-rca adapter. But, would that make any sense?. Also, maybe the box is broken. |
21st November 2020, 21:25 | #4 | Link |
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Has your sample been obtained with or without a de-macrovision box inserted ?
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22nd November 2020, 18:09 | #5 | Link |
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First of all, there is no "macrovision" - this is a company name (was ) and conversely encompasses about 3 major variants and some subvariations. There are other copy protections as well. One box does not solve all of them, not even a full pro TBC. One need a full TBC and a signal processor.
Anyway, back to your problem - and you should have done this BEFORE asking here - is this (d)effect seen on TV when playing the cassette? Can you confirm the signal leaving your "demacrovision" box has (or has not) this (d)effect? Can you insert a color proc or any other processor in order to fade the signal (if level too high it may be clipped or the DSP would react to it)? If your observations are correct and complete, it's not "macrovision".
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23rd November 2020, 14:47 | #6 | Link | ||||
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I think the problem is definitely on the camcorder. Some sort of Automatic Gain Control (as told by other users in other forum) that cannot be adjusted from the camcorder menus. Now I'm waiting to have another camcorder borrowed and see if I can do the capture with it. Thanks! Last edited by trotskito; 23rd November 2020 at 14:52. |
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2nd December 2020, 21:43 | #8 | Link | |
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For those who might be affected by similar problems...
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Last edited by trotskito; 2nd December 2020 at 21:54. |
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3rd December 2020, 18:23 | #9 | Link |
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The video signal (composite) is the same whether RCA or SCART.
The DVD recorder however may have different behaviour depending on the SCART used (if it has 2, I think E50 has 2), as the lower one is used for Decoder/STB and the top one for regular copying/connectivity. However, SCART may contain YC or RGB, which are usually not affected by macrovision. However, your Daewoo has no RGB nor YC output, so you can't profit therefrom.
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