Q: Exporting videos with a specific, custom aspect ratio.  In my case 3840x1070

  I'm producing a video that will play on a huge stadium "jumbotron" kind of thing.  They require very specific aspect parameters that are very wide.  I need them to be 3840x1070.  When I try to adjust it in "video properties" it just squeezes the video, don't want that.  I can manually crop at the bottom of the inspector and that gives me what I want to do, only approximately.  I have to use the crop from top and bottom numerical values.  I either need help in doing this another way, or help doing the math to convert an aspect ratio, like the one I need, to values to enter into the "top-bottom-left-right" crop/padding section of the inspector.  (there is a dropdown menu with standards like panavision, etc.)  There has to be a simpler way that I'm missing.  Any help would be greatly appreciated.  thx