Imp. Softwares: Free Video Converters

https://ffmpeg.org/

https://handbrake.fr/

https://mediacoderhq.com/

https://www.erightsoft.com/SUPER.html

https://www.avidemux.org/

http://www.pcfreetime.com/formatfactory/index.php

https://en.wikipedia.org/wiki/Comparison_of_video_converters