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Originally Posted by AmigaFuture
Argh, that 2:1 stuff is still very confusing to me. I under 4:3 is SD and 16:9 is Letterbox or HD...but otherwise...
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Ah, but there is 4:3 HD. Your ST:TNG mention is a prime example. They went back to the original film negatives and rescanned for HD. While the actual video that is displayed is 16:9, the 4:3 content is pillarboxed within the 16:9 frame.
BTW, the 2:1 ratio tends to be moot at extremely high bit rates.