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So this would mean that I should capture at 696x576 and add 4-pixel borders on the left and right side? After this, should I resize the capture as if it was ITU compliant
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The number 696 quoted here refers to the 696 ITU-BT601 13.5MHz pixels in the capture area used by the Hauppauge BT878/CX23881 drivers. (At least that is what I found. I could be wrong of course
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If your target is 704/576 ITU-BT601 13.5 MHz pixels, you are correct. (add 2x4 pixels, no resize)