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Originally Posted by nigel Depends on exactly the extent of the "problem". You should always expect the bottom few lines of an image off analog tape to contain severe distortion/disturbance. They all do. Not normally visible on direct playback to a TV due to overscanning, but can be seen when captured onto PC (which doesn't overscan). |
What you are seeing there is the head switching point. On a correctly aligned VCR this should be exactly 6.5 lines before vertical sync, and, as you say, this is normally hidden by overscan. It can sometimes be seen as a little horizontally twitching dot at the very bottom of the picture. The effect of guide misalignment is diffferent and is normally shows as noise or, in extreme cases, vertical twitching as the TV loses vertical sync.