Yo, this looks neat!
I (Windows 10 user) had an issue with the previewer, running default settings on the supplied example.mp4
The preview window pops up, but does not show anything.
I ran it via powershell to get some kind of error logs.
https://pastebin.com/4iH0ZyzH
I'll try it on my linux laptop later to see if my windows java install is weird or something.
Thanks.