Small thin line at the bottom when converting analog to digital

I encounter a small line at the bottom of my videos (this is also on the DVD that I burn) when I try to convert my Sony Hi8 to Digital while using iMovie HD6. When I try this at home on my Sony Viao PC with the built in Giga Pocket Converter there is no line. I thought that it might be my DV converter a datvideo DAC-200 so I got a PyroA/V Link converter and the result was the same. When I use my Sony DV Camcorder every thing is great. I talked to apple support and they said that it was probably the tape. I told them that I had tried several HI8 tapes and the result was the same. (they were no help) Does anyone have these issues BB
MacBook Pro2,2 Mac OS X (10.4.8) Intel Croe 2 Duo 2.33 GHZ

See also:
http://lipas.uwasa.fi/~f76998/video/conversion/#faq
4. Frequently Argued Questions
4.1 Isn't 720 the real width of a 4:3 image? If not, then why are 720 pixels sampled instead of 711 or 702 (or whatever)?
720 pixels are sampled to allow for little deviation from the ideal timing values for blanking and active line lenght in analog signal. In practice, analog video signal - especially if coming from a wobbly home video tape recorder - can never be that precise in timing. It is useful to have a little headroom for digitizing all of the signal even if it is of a bit shoddy quality or otherwise non-standard.
720 pixels are also sampled to make it sure that the signal-to-be-digitized has had the time to slope back to blanking level at the both ends. (This is to avoid nasty overshooting or ringing effects, comparable to the clicks and pops you can hear at the start and end of an audio sample.)
Last but not least, 720 pixels are sampled because a common sampling rate (13.5 MHz) and amount of samples per line (720) makes it easier for the hardware manufactures to design multi-standard digital video equipment.

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http://img.skitch.com/20080820-d4623ia122inbdbwex6c7cciyb.png
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Small thin line at the bottom when converting analog to digital

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