Editing movies with FFMPEG in command line
While travelling with my 10-year-old Linux laptop I produced an application video for an acrobatics teacher training.  Nothing fancy, but it turned out decent.  I'm not sure if this qualifies as a "movie" since it's just a series of unrelated clips accompanied by music. The video is about 10 minutes long.  It's also up on youtube but I think not playable in some countries due to use of copyrighted music.

I was working on another one, an acroyoga flow performance shot on a couple of phones, but there didn't seem to be a way to get ffmpeg to do a Ken Burns zoom over multiple frames of video without a weird stuttery effect.  So I decided to wait until I got home to finish that one in FCP.

I found it was a pretty straightforward approach.  I like that the parameters are all explicitly stated and you don't have to go digging into settings in the hope that you might figure out how to, for example, replicate the scaling that you used on a particular clip.  Perhaps that speaks to my lack of experience with video editing.  Also if you're not a relatively advanced command line user it would be more complicated for you.  I probably spent most of my time Googling how to perform particular manipulations with ffmpeg. I think the whole editing process took about the equivalent of a work day.