Script avec ffmpeg sur powershell

@echo off
Title Get MP3 Duration for all files in a directory with ffmpeg
Set Folder=C:\Program Files\Blue Iris 4\www\sounds\
Set ffmpeg=%~dp0ffmpeg.exe
Set LogFile=%~dp0MP3_Infos.txt

CD /D "%Folder%"
(
 @for /f "delims=" %%a in ('dir /s /b *.mp3') do (
  @for /f "tokens=1 delims=," %%b in ('%ffmpeg% -i "%%~a" 2^>^&1 ^| find /I "Duration"') do echo %%~nxa  ^|%%b
 )
)>"%LogFile%"
If Exist "%LogFile%" Start "" /MAX "%LogFile%"

airhorn.mp3  |  Duration: 00:00:02.81
alarm-frenzy.mp3  |  Duration: 00:00:02.66
alarm.mp3  |  Duration: 00:00:04.13
alarming.mp3  |  Duration: 00:00:02.30
alien-message.mp3  |  Duration: 00:00:02.52
alien-tune.mp3  |  Duration: 00:00:03.71
are-you-kidding.mp3  |  Duration: 00:00:00.83
attention-required.mp3  |  Duration: 00:00:01.87
blocker.mp3  |  Duration: 00:00:00.54
decay.mp3  |  Duration: 00:00:01.98
demonstrative.mp3  |  Duration: 00:00:07.99
determined.mp3  |  Duration: 00:00:02.70
doorbell.mp3  |  Duration: 00:00:01.57
enough-with-the-talking.mp3  |  Duration: 00:00:00.72
gentle-alarm.mp3  |  Duration: 00:00:00.54
gesture.mp3  |  Duration: 00:00:01.84
good-morning.mp3  |  Duration: 00:00:07.24
goodbye.mp3  |  Duration: 00:00:00.25
hail.mp3  |  Duration: 00:00:00.25
hell-yeah.mp3  |  Duration: 00:00:02.23
high-pitch.mp3  |  Duration: 00:00:03.28
i-demand-attention.mp3  |  Duration: 00:00:01.66
i-saw-you.mp3  |  Duration: 00:00:00.97
job-done.mp3  |  Duration: 00:00:00.61
just-like-magic.mp3  |  Duration: 00:00:01.91
long-chime-sound.mp3  |  Duration: 00:00:04.82
may-i-have-your-attention.mp3  |  Duration: 00:00:00.40
munchausen.mp3  |  Duration: 00:00:02.02
news-bringer.mp3  |  Duration: 00:00:01.12
no-way.mp3  |  Duration: 00:00:00.32
not-kiddin.mp3  |  Duration: 00:00:04.93
oh-really.mp3  |  Duration: 00:00:01.26
on-serious-matters.mp3  |  Duration: 00:00:01.55
paranoid.mp3  |  Duration: 00:00:01.04
pizzicato.mp3  |  Duration: 00:00:01.30
police.mp3  |  Duration: 00:00:02.98
pop.mp3  |  Duration: 00:00:00.26
professionals.mp3  |  Duration: 00:00:00.47
quiet-knock.mp3  |  Duration: 00:00:00.90
robot-walking.mp3  |  Duration: 00:00:03.74
served.mp3  |  Duration: 00:00:00.50
sorted.mp3  |  Duration: 00:00:00.90
springy.mp3  |  Duration: 00:00:02.63
surprise-on-a-spring.mp3  |  Duration: 00:00:00.72
system-fault.mp3  |  Duration: 00:00:00.54
the-squeaky-wheel-gets-the-grease.mp3  |  Duration: 00:00:01.15
this-is-it.mp3  |  Duration: 00:00:00.83
warning.mp3  |  Duration: 00:00:30.31
what.mp3  |  Duration: 00:00:00.47
wiggle.mp3  |  Duration: 00:00:00.60
will-you.mp3  |  Duration: 00:00:01.15
you-wouldnt-believe.mp3  |  Duration: 00:00:00.47