Say no more to big video files stored on disk only for few seconds of content.
You can also make short clips for sharing on YT/Vimeo etc.
Just install ffmpeg on Ubuntu/Debian
sudo apt-get install ffmpeg
then set start and end of a clip
ffmpeg -i longvideo.avi -vcodec copy -acodec copy -ss 00:34:00 -t 00:40:00 shortvideo.avi
It’s not transcoded so it’s fast and new file have original quality.