Powershell to get best quality video and audio using youtube-dl

Get-Best.ps1

Param(
[Parameter(Mandatory=$true)]
[string]$url
)

# run in a directory that contains youtube-dl.exe and ffmpeg.exe

$qualityList = `.\youtube-dl.exe -F $url`
$videoOnly = $qualityList | Select-String -Pattern 'video only' -CaseSensitive -SimpleMatch
$best = $videoOnly[$videoOnly.length-1]

if ($best -like '*mp4*') {
	$params = " -f bestvideo[ext=mp4]+bestaudio[ext=m4a] $url"
} elseif ($best -like '*webm*') {
	$params = " -f bestvideo[ext=webm]+bestaudio[ext=webm] $url"
} else { 
	Write-Output "Unknown type."
	exit 1
}

$command = ".\youtube-dl.exe"
$paramsSplit  = $params.Split(" ")

& "$command" $paramsSplit