Using #ffmpeg to convert video formats, fast and without sensible loosing quality:

Converted video has only 1/3 of original file size.

🪟 Windows users:

1. Download 'ffmpeg'
https://www.gyan.dev/ffmpeg/builds/ffmpeg-git-full.7z

2. unzip file in somewhere like : C:\Program Files\ffmpeg
now you have folders like bin, doc , .. in this directory.

3. add path, so windows know where is it
Properties > Advanced System Settings > Advanced tab > Environment Variables
In the Environment Variables window, click the "Path" row under the "Variable" column, then click Edit > click NEW
paste this address:
C:\Program Files\ffmpeg\bin
Done!

😎 Debian users:
$ sudo apt install ffmpeg
Done!


now you open a windows shell and convert the video:
go to the directory that movie file exist:
for example :
cd .\Downloads\


ffmpeg -i input.webm -r 10 -cpu-used 5 -c:v libx264 -crf 20 -c:a aac -strict experimental -loglevel error output.mp4

20+ FFmpeg Commands For Beginners
A quick guide for using ffmpeg