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| Mytrix |
| Posted: Nov 12 2011, 01:52 PM |
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Newbie
Group: Members
Posts: 2
Member No.: 33575
Joined: 12-November 11
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Hey Community,
these days i planned for digitizing some video tapes.
After the first record i realized that there is anything wrong with the video material.
I guess it's a problem by the tape - however, is there any filter for correcting the problem?
Greets and thanks
Mytrix |
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| evropej |
| Posted: Nov 13 2011, 01:10 AM |
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Advanced Member
Group: Members
Posts: 514
Member No.: 26523
Joined: 28-November 09
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I nominate this question as the most vague description of a problem ever.
Please pin lol
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| jpsdr |
| Posted: Nov 13 2011, 08:33 AM |
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Advanced Member
Group: Members
Posts: 335
Member No.: 20490
Joined: 23-December 06
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This is standard jitter problem from VHS. The way to correct it is a TBC : Time Base Corrector. It's an hardware system you put after your VCR, and before sampling device/card. Unfortunately, these TBC devices are not realy cheap, and, as far as i know, i've yet never seen filter correcting this. Asking on different forums, you will (or may) probably have almost all the time the same answer : use a TBC.
... I may get the wrong problem. If it's not jitter wich bother you, but yellow shadow, i don't think there is solution. It's because of low chroma bandwith, and problem is increased each time tape is copied, and i'm affraid there is probably nothing against it. |
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| Mytrix |
| Posted: Nov 13 2011, 08:35 PM |
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Newbie
Group: Members
Posts: 2
Member No.: 33575
Joined: 12-November 11
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Hi jpsdr,
thanks a lot for you response.
It's good to know that this is caused by the VHS and not a (real) problem during the digitizing.
Greets
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| phaeron |
| Posted: Nov 20 2011, 07:49 PM |
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Virtualdub Developer
Group: Administrator
Posts: 7773
Member No.: 61
Joined: 30-July 02
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Er, are you sure this is timing jitter? This looks like analog signal ringing to me.
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| jpsdr |
| Posted: Nov 21 2011, 08:26 AM |
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Advanced Member
Group: Members
Posts: 335
Member No.: 20490
Joined: 23-December 06
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I first thought he talked about timing jitter you can see at the bottom of the f, before noticing the most obvious yellow shadow, wich is not, of course, a timing jitter, but something related to how VSH worked, and it's related to several things (diaphony caused by magnetic proximity on tape, low pass filter on chroma and others i don't remember), unfortunately irreversible, and amplifyed by copy.
Out of curiosity, what format is VHS (PAL, SECAM or NTSC) ? Is it an original or a n generation copy ? |
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