Calculate Video Size

[lazaruz]

I was wondering what the formula for calculating the framesize for a video could be.

Let's say I have a video that is 685x512 and I want the target width to be 640, how do I calculate the height?

And when I have calculated the new height, it's suppose to be dividable by 16, right? how do I then calculate for the border/cropping?

[coldfire82]

calculate height keeping in view the same proportion..
e.g.
to convert from 640x480 to width 512 then u would calculate height by dividing it with the same proportion and that would result in 384

for proportion i mean: 640/480 results in 4/3 so divide 512 by 4/3 u will get 384.
Now for ur supposed width 685 (which is not divisible by 16) i am not sure what would u calculate but from my method its 478.346 ..well u can take height as 478 and do padding for 1-pixel row (if necessary)

regards
coldfire
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[lazaruz]

Thanks, I will try it out

[anonymez]

coldfire has it right, but round it up to 480.