and every other non-sadist would've done this in 2 seconds in <insert 500+ FOSS video editors>. not sure how wrangling a byzantine CLI is a joy to use.
I'm not saying the CLI is easy to learn, but once you do learn it, you have a lot of power at your fingertips.
Well if you do want to do any notable editing, it should be easy to make proxy videos to solve that problem. A few clicks to enable, even.