Yep.
Why 864, not 853?
Because DV is D1 with 3 pixels lopped off the top and 3 off the bottom.
D1 widescreen is 864×486, which is 16×9 proportion if you divide each dimension by 54.
So. Lop 6 pixels off and you have 864×480.
To rephrase: DV comes from D1, so when calculating 16×9, start with D1 height (486) to get 864 width, then remove 6 pixels from the height. Don’t start with 480 height then calculate 16×9 from there to get 853 or 854. It just ain’t right.