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its fairly simple actually
for example, i usually resize my vids so that they play with the axe in its normal orientation, so any vids i resize are allways 240 wide.
so, if i wanted to resize your vid of 352x240 to be 240 wide the calc would be as follows.
desired width / orginal width = 240 / 352 = .6818181818
next, to find the new height to go with the 240 width we multiply the orginal width by the number we just obtained..
240 x .6818181818 = 163.63636364
divx 5.05 requires that the height be a multiple of 2 and the width be a multiple of 4, so all we have to do now is round the new height up to 164 and were all done.
the new video size is 240 x 164
same appilys to any other size you might want....
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