I don't think it's in the vertical blanking interval by strict
definition since there should be 485 of true video lines, but I agree
that it's in the area that's typically considered overscan for analog
TV's.
After doing some more research the consensus seems to be that it's head
switching noise, an area in the video signal where a multi head drum
switches from one head to the next. It's a characteristic of how the
analog signal is recorded.
Randy
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