Earlier quoted context omitted.
I was gonna ask that. Every video editor I've tried, even back to Windows Movie Maker, crashed frequently. I don't know why. ffmpeg is rock-solid. Modern CPUs are good enough that you can basically handle 1080p without touching accelerators. Multi-threading is not impossible to get right in C++. So why do they all crash?
Try DaVinci Resolve
Image/photo editors never crash (or so rarely), same for most modern audio editors / DAWs and the later can use an awful lot of memory too.