FFmpeg

ffmpeg Documentation
https://ffmpeg.org/ffmpeg.html

How to convert video to animated gif image on Linux
https://pupli.net/2017/03/how-to-convert-video-to-animated-gif-image-on-linux/

Convert m2ts to mp4, mp4 to webm, mp4 to ogv using ffmpeg
https://pupli.net/2020/05/convert-m2ts-to-mp4-mp4-to-webm-mp4-to-ogv-using-ffmpeg/

Convert MP4 video to MP3 audio with FFmpeg
https://pupli.net/2022/02/convert-mp4-video-to-mp3-audio-with-ffmpeg/

Show Video Thumbnails on KDE Dolphin
https://pupli.net/2022/08/show-video-thumbnails-on-kde-dolphin/