How to calculate resizing, using aspect and crop ratios?

[guit]

Hello,

I am wondering if there is a formula for how to calculate a resize, using VLC's aspect and crop ratios...I don't really know how to explain so I will give an example. Let's suppose:

- I have a video that when played with VLC, doesn't fit the screen (black borders at every sides), and also have an incorrect aspect ratio.

- I need to set VLC's aspect ratio to 16/10, and the crop ratio to 16/9, to have the correct aspect ratio and to fill the screen on the left and right side.

- The video size is 640x480.

Using these data, how to calculate the values that I will enter in my video encoder's resize filter, to have the output playing at the correct aspect ratio and without left/right borders in VLC?

[mederi]

Is your situatuion similar to this one?
viewtopic.php?f=14&t=92650#p307568
There are some calculations below the post there.