Isn't the better solution for most users a GUI tool like Avidemux?[1] The point being that those who want to use the command line are precisely the people who need to understand all its complexity.

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[1] https://avidemux.org. Avidemux has a "built-in libavcodec library from FFmpeg (i.e. Avidemux contains its own copy of libavcodec, external FFmpeg is not used)"