Okay MkvToolnix isn’t the right tool for that afaik, but ffmpeg is and it sucks there isn’t a GUI for it that’s as powerful as the cli which is what I use, luckily you can find a lot of help online,
Apart from that I’m afraid i can’t help much, but good luck with your search!
Are you trying to concat streams or just to remux? For remuxing as roawre said there’s also MkvToolNix, which works great (and it has a gui don’t worry)
Sure you have to enable E2EE but they never say they use E2EE by default, they’re not advertising at all anyway. Saying it is "not secure at all" is a bit of a reach. They have proven they don’t share data with governments and again, you can use E2EE if you want
Thanks mate!
To be honest I have even less experience with git, but wouldn‘t I need to fork the project and do the whole thing in typescript to make a PR?
Us people