ffmpeg webm to mp3

cd "<ENTER YOUR PATH TO THE FFMPEG FOLDER>"
$oplist = gci -Path "<ENTER YOUR PATH TO THE FFMPEG FOLDER>*" -Include *.webm | Select name -ExpandProperty name
$i = 0
foreach ($op in $oplist){
$opTitle = [IO.Path]::GetFileNameWithoutExtension($op)
.\ffmpeg.exe -i .\$op .\$opTitle.mp3
$i=$i+1
Write-Progress -activity "Downloading MP3's. . ." -status "Scanned: $i of $($oplist.Count)" -percentComplete (($i / $oplist.Count)  * 100)
}