Can't launch script 2

Hello,

using in YoloAIO.vpy theses values for test:

FontColors = [
	Color( [ 241, 237, 97 ] ),
	Color( [ 170, 170, 170 ], marginRel = 0.1, marginAbs = 40 ),
	Color( 'black', SeuilI=190, SeuilO=80 )
]

I launch successfully 1.ProduceFilteredVideo.sh, and it creates me file Filtered_video.mp4

So I launch 2.LaunchYoloCRMod.sh and I have theses errors:

INFO:YoloCR:Selected video file : Filtered_video.mp4

INFO:YoloCR:Checking for external dependencies ..
ERROR:YoloCR:'NoneType' object has no attribute 'group'
ERROR:YoloCR:Could not retrieve ffmpeg's version. Make sure it is installed on this system and 'ffmpeg -version' can be called on your shell

I can successfully call ffmpeg -version

$ ffmpeg -version
ffmpeg version n4.4 Copyright (c) 2000-2021 the FFmpeg developers