I think this is a common problem because I'v seen it in other peoples captures as well. I get this little band of offset/jumbled video at the bottem of the screen. I don't know why it happens but it only happens with VHS. Unfortunately my Cannon ZR10 doesn't support passthough or I would have tried that already. I could be wrong about that but I'm quite sure it doesn't support it. As it goes, any help would be much appreciated.
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Are you seeing this when viewing the capture on your pc screen? If yes, I believe it is normal. TV normally has overscan where the video would go beyond the border of the normal viewing area. Manufacturers do this to compensate for the slight misalignment that is bound to occur as the TVs are transported from the factory. You see it on your capture because it displays the full video. If you convert your capture to VCD and play it back thru your TV you will not see it.
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It's the head switching of the VCR. When playing back a video tape, two heads are mounted 180 degrees apart on the spinning head drum. Each head records/playback one field. If the head switching was in the vertical blanking/sync area, the vertical sync would be damaged. So, the standard is to do the head switching right before the vertical blanking, which will be the last few lines in the bottom of the picture. Since two VCRs are not the same, there will be an offset when switching from head to head, so the video will jump to the side at the switch point. Under normal TV viewing, the overscan of the TV set will not reveal the last few lines of the video frame, thereby not showing the switch points. For viewing on a PC monitor, you will have to live with it, or blank out the last few lines in Vdub.
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I see it when I capture to my miniDV cam and even when I make a vcd out of it there is still that stupid line at the bottem when I play it in my dvd player. Is there any VHS player that doesn't have that problem ?
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You won't see it on your TV, but it doesn't hurt to crop out or mask it. I am quite certain that a 3 pixel black bar will compress better than random video.
Darryl
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