Just for those who want to create sound with AUDACITY
1) download a complete match if possible
2) use "free AVI video converter" : https://free-avi-video-converter.fr.sof ... x=BB-865.0
3) convert your video with "AVI video converter" in" .mp3" format
4) open AUDACITY, and open your .mp3
5) ctrl+A > select all your sound
6) then click on file > export in .wav
7) re-open AUDACITY with your .wav file
8) work on it…
That's "all"