I have a lower 3rd graphics file and it looks great over all the video footage in my sequence, but when it is over a still image, the very top line of the graphic vibrates/jitters a noticeable amount. Any thoughts on why and how to fix? I'd rather not introduce blur if I can help it.
If it's high contrast and interlaced that could cause the flicker. If there's a thin horizontal line at the top, that could be the culprit. You could try cropping a line or two and see if that helps. Otherwise, try a slight feathering of the edge.
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