Sitecore Powershell Image upload

Upload-MediaItems.ps1

function Update-MediaItem {
    [CmdletBinding()]
    param(
        [Parameter(Position=0, Mandatory=$true, ValueFromPipeline=$true)]
        [ValidateNotNullOrEmpty()]
        [string]$filePath,

        [Parameter(Position=1, Mandatory=$true)]
        [ValidateNotNullOrEmpty()]
        [string]$mediaPath)

    [Sitecore.Data.Items.MediaItem]$item = gi $mediaPath
    [Sitecore.Resources.Media.Media] $media = [Sitecore.Resources.Media.MediaManager]::GetMedia($item);
    $extension = [System.IO.Path]::GetExtension($filePath);
    $stream = New-Object -TypeName System.IO.FileStream -ArgumentList $filePath, "Open", "Read"
    $media.SetStream($stream, $extension);
    $stream.Close();
}

function Find-MediaItem {
    [CmdletBinding()]
    param(
        [Parameter(Position=0, Mandatory=$true, ValueFromPipeline=$true)]
        [ValidateNotNullOrEmpty()]
        [string]$mediaName)
        
	$query = "/sitecore/media library//*[@@name='{0}']" -f $mediaName
	Write-Host $query
    [Sitecore.Data.Items.MediaItem]$item = Get-Item master: -Query $query | Select -First 1
	return $item
}

#write-host "$SitecoreDataFolder"

Get-ChildItem "$SitecoreDataFolder\upload\*.jpg" -Recurse| ForEach-Object {
	$file = $_;
	Write-Host $file.FullName
	$mediaItem = Find-MediaItem $file.BaseName
	$mediaPath = "{0}{1}" -f $([Sitecore.Constants]::MediaLibraryPath), $mediaItem.MediaPath
	$mediaId = "{0}" -f $mediaItem.ID
	Write-Host $mediaId $mediaPath
	if ($mediaId -ne "") {
		Update-MediaItem $file.FullName $mediaPath
		Remove-Item $file
		Write-Host "Imported and deleted"
	}
}