Used this for ages. People will bring up various alternatives (including just strictly using FFmpeg) and I have to wonder if the only use case they can fathom is clipping 1 segment out of a longer video. All suggested alternatives would involve such a garbage workflow and unintuitive experience for any real project. I dislike Electron as much as anyone else but it works fine here, and does the job better than anything else I've tried. I am very comfortable with FFmpeg and have used pretty much any tool you can name, I still use Losslesscut daily.
Not sure exactly what your use case is, but I use vidcutter for lossless clip extraction and it works great and does not require Electron (it's QT based I believe). https://github.com/ozmartian/vidcutter
To answer a point that's been brought up elsewhere in the thread, one nice feature of vidcutter is that you can either cut fully losslessly (on keyframes) or cut frame-perfect while only encoding the frames before and after the first and last keyframes in the cut.
The Arch Linux package for vidcutter is only 4 MB. It has dependencies, of course, but I already have all of them installed for other things. (There's nothing uncommon.) All praise to dynamic linking.
Vidcutter is good but no where near as customizable as Losslesscut (specifically in terms of keybinds) and using the timeline is nowhere near as smooth. Its being developed in a way I approve of much more but I still prefer using Losslesscut by a large margin. If it ever catches up I'll be thrilled because I do like what its about a lot more but I don't really think it currently competes in terms of user experience. Still if it works well for you then there's a lot to appreciate.
I use FFmpeg for multiple streams and mux them into another container file format. Don't see what LosslessCut does outside of FFmpeg expect for the UI. The backend is anyway FFmpeg as another comment mentions. CLI haters I can understand, not me.
I at times am chopping up 2-8 hour videos with dozens of clips that are not pre-defined for me. I can do this with FFmpeg and I love doing most things from terminal but its a pretty hard sell when what you're doing involves something inherently graphical. I use FFmpeg for all sorts of things but it just doesn't make sense for editing such large videos on the fly like this.
