FFMpeg really helped me out not too long ago. I tried KDenLive and ShotCut to edit some videos, which I rarely do, only to be overwhelmed and then discover that

FFMpeg really helped me out not too long ago. I tried KDenLive and ShotCut to edit some videos, which I rarely do, only to be overwhelmed and then discover that ffmpeg command can do everything from timelapses to trimming and brightness/contrast adjustments. And you can "preview" the result too, using ffplay.