According to this page (http://esotericsoftware.com/spine-export#Usage) one of the properties that you can pass into a command line export is -s or
scale. When checking -h this argument isn't listed and it doesn't appear to work. I have a .json animation that I'm trying to convert to a .skel binary but as I can't pass in the scale argument it's breaking the animation completely. Not really sure what to do next here. There's a whole bunch of these files so it's impractical to convert them manually.
I've tried this on 3.6.53 and 3.7.19-beta