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Why are SD down-convert sizes different from SD standard sizes?

April 26, 2017different down-convert sd standard

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Why are SD down-convert sizes different from SD standard sizes?

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When we down-convert an HD clip with the aspect ratio 16:9 to an SD clip with the aspect ration 4:3 we do not cut or letterbox the clip in order to keep the full SD height (576px bzw. 486px). Thats why we end up with a width of 1024px, or 864px respectively.