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转换范例：
512x492 pixel = 330 horizontal tv lines
512x582 pixel = 330 horizontal tv lines
640x480 pixel = 400 horizontal tv lines
768x492 pixel = 470 horizontal tv lines
768x582 pixel = 470 horizontal tv lines
1280x960 pixel = 800 horizontal tv lines
好像实际计算不等？？？请教怎么换算 | 
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