I came across this site, and it has all sorts of video test files...
https://www.demolandia.net/4k-video-test.html
I will use to test UHD Converter
![Wink ;)](./images/smilies/icon_wink.gif)
I assume they will ALL work, as they are probably all properly following all standards. It's the odd badly encoded files we need to find to help VSO fix exceptions
![Wink ;)](./images/smilies/icon_wink.gif)