Discolored frames in VHS capture?
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Hi all,
I have a few VHS tapes that I'm capturing digitally. I've been poking around the forums here, and there definitely are many things I could be doing better, but I'm generally pretty happy with the results I've been getting with the hardware I've got. I've done a few tapes already that came out looking good, but the one I'm working on now has some weird color variations that I have not seen on other tapes. In short, it looks like the colors flicker a little bit, suddenly becoming pinker or yellower and then back again. I attached an image here showing two screenshots taken from two consecutive frames in the capture. As you can see, the color in the top half (first frame) looks very different from the bottom half (second frame). This is not a problem I've seen on other tapes I've captured with the same VCR & capture card. My guess, then, is that this is just something that happens on old tapes that have been watched a thousand times. Does that sound accurate? Or is there something else that might be going on? If that is the case (this is just for curiosity's sake), what happens to the tape with time & use to cause this? Is there any particular kind of filter that can be applied to improve how it looks? Though I don't think the hardware or software is the issue, for completeness, I'm using:
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That exact Samsung isn't a bad deck, like most, for being a mere consumer VHS VCR. The main issue is the OSD for tracking can't be shut off.
However, you lack any sort of TBC functionality, and that can't look good. You will have wiggles in the image, and likely other issues. Color can also be affected. And then dropped frames are extremely likely, almost a given. At the bare minimum, you need an ES10/15 for half a TBC(ish). There will still be issues, and a fail rate, but substantially better than what you're doing now. The Conexant chipset is that capture isn't great, and may have AGC issues. (Is it related to the VC500 chipset? Also AGC, other issues, not great.) I doubt gstreamer has a dropped frames counter. Does it? Lack of any TBC/TBC(ish) is a likely culprit here. But the whole workflow has weaknesses. At under $200, the ES10/15 (cheap) should be a no-brainer. And if you want a full TBC(ish), DVK+ES10/15, I have a modded/preset DVK in the marketplace. |
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Thanks for the help, I appreciate it! |
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Maldata, have a look at this thread:
http://www.digitalfaq.com/forum/vide...fix-green.html It'll show you what the ES-10/15 can do. Cheers, Al |
On the PAL Samsung models you can turn off the OSD in the menu, and adjust the sharpness. I wonder why that's left out on the NTSC ones.
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From the thread Hushpower sent:
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What I was trying to get from this discussion is some confidence that either the problem was the tape (e.g., "that's just what happens as tapes age") or something fixable (e.g., "you need to clean your VCR"). It sounds like the consensus is that you just really need something to fix that signal sometimes. That's fair, I just have to find a good balance between what I'm willing to spend on this project and what's available to do that work. Maybe this should be in a separate thread, but has anyone looked at the guts of the ES15 to see what video decoder chip is in there, and if it's in any other products? I went down a pretty deep google rabbit-hole last night and saw some discussions (on this forum and elsewhere) about things like video scalers that have some line TBC features. I wonder if the ES15 uses the same chip as other cheaper, more widely available devices. |
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But I didn't see it in the V1000 menu (either that, or tracking OSD was on regardless of setting, I forget). Quote:
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Well... you talked me into it. I broke down and got an ES15, and I haven't seen the problem since. Also, everything is less wobbly.
Ended up learning a lot here, and you fixed my problem, so A+, would post again (in fact, about to)! Thanks, all! Definitely appreciate the help. |
Great stuff maldata, the "TBCish" ES15 strikes again! :D
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