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I'll sperg-rage for a moment here and say that I've gotten increasingly more fed up of the argument that "X format is shit because Y program...
Give Avidemux2 a try. It's basically just a GUI wrapper for FFMPEG and it works great for basic things like clipping. If you only cut on I-frames...
I would also suggest LosslessCut I haven't had any issues with it so far. Although obviously it has the limitation that you have to cut your clip...
Avidemux has HEVC support and if it's like x264, you cut on I-frames so you can trim the video without re-encoding.
I don't consider either of...
Lossless Cut does a pretty good job. I've rarely had it choke on any h265 streams or have trouble clipping things. Just don't click the stupid...