ffmpeg batch convert mp4 to webm

gistfile1.txt

$folder = "C:\path\to\folder"
$webm = "C:\path\to\webm\folder"

$mp4Files = Get-ChildItem -Path $folder -Filter "*.mp4"

foreach ($file in $mp4Files) {
    $fileName = $file.Name
    $input = $folder + "\" + $fileName
    $output = $webm + "\" + $fileName.Replace(".mp4", ".webm")

    ffmpeg -i $input $output
}