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| Unofficial VirtualDub Support Forums > VirtualDub Filters and Filter Development > Filter For - I Don't Know How To Say - |
| Posted by: Mytrix Nov 12 2011, 01:52 PM |
| 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 |
| Posted by: evropej Nov 13 2011, 01:10 AM |
| I nominate this question as the most vague description of a problem ever. Please pin lol  |
| Posted by: jpsdr Nov 13 2011, 08:33 AM |
| 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. |
| Posted by: Mytrix Nov 13 2011, 08:35 PM |
| 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 |
| Posted by: phaeron Nov 20 2011, 07:49 PM |
| Er, are you sure this is timing jitter? This looks like analog signal ringing to me. |
| Posted by: jpsdr Nov 21 2011, 08:26 AM |
| 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 ? |