A small and fast open source program to trim a shot without having to recode. Similar to Avidemux. Its based on the Chromium HTML5 engine, which I dont understand if its good or bad and doesnt recognize h265.
Lossless-Cut looks similar to Vidcutter
that I used a few weeks ago to shorten (without recode) old DV files for a friend.
It is also available for Linux, macOS and windows.