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Physical damage accounts for the majority of tape problems compared to signal damage. such as tape shrinkage or stretch, magnetic layer physical degradation, physical damage due to hardware failure, mould and similar problems. |
Why then do some of my reds end up 3 pixels right and sometimes 3 pixels down?
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Gov backed finding: https://www.govinfo.gov/content/pkg/...606c1d6910.pdf |
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- On how many vastly different TBCs and capture cards? - And are you 100% certain that's not how the tape was a recording time? Almost all people have false memories of how it looked, mostly because the small CRTs hid flaws, and you now see it pixel perfect.) Quote:
Start here: https://amzn.to/3IJRhwQ Of course, since this person simply ranted, rather than answer questions from the previous post (ie, Why did he think the random figure of "20-30% lost quality?"), and then submitted a bogus email address (why his account is now invalid), I have zero faith he'll do this. Hopefully others will be smarter. |
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Talk about 'apples to oranges', this even predates the chemistry used for domestic videotape, they're not at all comparable. This is a study of digital data tape coated with prehistoric oxide chemistry, designed to be driven into full saturation. It says precisely nothing about videotape. This shows a considerable lack of knowledge of the subject. You can't use this, sorry. |
Yeah, don't store VHS tapes near loudspeakers or devices with magnetic fields like transformers, storing your tapes also in room temperature and a no(t) to damp air, and your tapes will go for a long time, maybe once in while spool back and forward the tapes against pushthrough sound of the linear audio tracks ? don't know if this is a issue for VHS tapes, i think the RetroTink series is not tuned for VHS, and way too expensive to just try this, a DVD/HDD recorder from the thrift shop (as passthrough) is cheaper and will have more affect.
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Re the talk about "tape fade", many newer VCRs have features that will auto-adjust sharpness and noise reduction stuff based on some tape condition parameter. (e.g BEST/Video calibration in JVCs, CVC on panasonic decks, OPC/APC on Sony's and so on.) Additionaly there is some non-linear deemphasis/detail enhancement (especially on LP/EP/SLP speeds) that will be affected by how noisy the input is which will also have some impact.
So, it's possible these changes may have confused some people leading them to think tape aging causes softer images or whatever. What you do get rather when the magnetic signal on tape is weaker is more noise relative to the actual video signal, which would mean the raw output from the tape will be noisier, maybe especially chroma since that's stored more directly. That can be impacted by many parameters though, so it's not as simple as always attributable to aging though. Quote:
Example from a Panasonic NV-F77, the non-SVHS little brother to the NV-FS200. You can see the chroma is shifted down on the first image (Normal) compared to the second one (EDIT setting). Easier to spot if you open each image in a new tab and switch between them. Attachment 15474 Attachment 15475 When looking at the output on e.g my JVC HR-S8600 and JVC HR-S6900, SVHS the chroma isn't shifted between EDIT and Normal so those seemingly compensate for it, while other non-SVHS decks I checked seemed to have the same chroma shift. My Panasonic NV-HS870 also seemed to have a chroma shift (despite being SVHS and featuring digital NR) on default settings (no EDIT setting on this one.) The much older Panasonic AG5700 SVHS I have seemed to compensate at least to a degree (no picture setting at all on this one.) Idk if this applies to all non-SVHS decks or if ones with more advanced chroma NR act differently etc as I haven't studied in detail. Suspect it's more noticeable on PAL due to needing 2 lines of delay for comb filtering rather than just 1 line on NTSC due to how the color is encoded. This effect is compounded on dubbed tapes of course which can lead to chroma being very offset. Broadcast video gear like TBCs and VCRs with digital processing seem to often feature Y/C delay adjustment sliders so presumably this is a thing that needs to be compensated for even there. Horizontal offset I'm a bit less sure about the cause of, but presumably there may be some slight differences in Y/C delay internally too, either on recording or playback. |
These noise compensations i only see on the output of the SCART of my Panasonic combo, the component output does not have this, and is much better to watch from anyway the compensations also "trail" when there's movement, very weird effect not nice to look at, with normal video levels there's no problem on SCART or composite, one should avoid these connections anyway for transfers.
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GV-USB2 https://www.digitalfaq.com/forum/att...1&d=1678317923 Tink5x https://www.digitalfaq.com/forum/att...1&d=1678317437 Brightness and contrast is a bit off but I can correct that in post. Unfortunately it doesn't really correct dropouts well, even in triple buffer mode. :/ https://www.digitalfaq.com/forum/att...1&d=1678317469 |
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